Some big ISA rule changes are coming in from 6 April 2027. They mostly impact cash ISAs. But there are downstream consequences for stocks and shares ISAs, too. 

We’ll briefly summarise the stocks and shares ISA changes here, and then press on with the main business after that. 

6 April 2027 stocks and shares ISA rule changes 

The new rules are intended to prevent investors from treating their stocks and shares ISAs as cash ISAs.

The annual allowance remains at £20,000 per year for a stocks and shares ISA. 

From 6 April 2027, however, a 22% flat rate charge will be imposed upon any cash interest earned within a stocks and shares ISA.  The charge is administered by your ISA manager. You do not need to declare it on your tax form. 

The Personal Savings Allowance will not apply. 

The flat-rate charge applies to everyone regardless of age. 

The flat-rate charge does not apply to non-cash interest. It’s not levied on money market fund interest, for example. 

If money market funds are the only investment in your stocks and shares ISA account then they will be deemed non-qualifying. 

A non-qualifying investment must be sold or transferred outside the ISA, by the ISA manager, within 30 calendar days of the date upon which the money market fund became non-qualifying.

This rule applies to everyone regardless of age. 

Hold less than 100% of your stocks and shares investments in money market funds to avoid the status change from qualifying to non-qualifying investment.  

Finally, under 65s won’t be allowed to transfer a non-cash ISA to a cash ISA. This rule does not apply if you’re over 65, or turn 65 in the current tax year. 

2026 to 2027 stocks and shares ISA guide

The joy of a stocks and shares ISA is that it legally protects your investments from tax on growth and income. That’s more important than ever as tax-free allowances are slashed and tax rates go up.

If you hope to build wealth through investing then shielding your gains from unnecessary tax must be a core part of your strategy.

ISAs are tax-efficient ‘wrappers’ created by the UK government to encourage saving. Any investment inside the ISA wrapper can grow tax-free as long as you don’t break the rules.

Stocks and shares ISAs are provided by high street banks, fund managers such as Vanguard, financial advisors, and specialist online brokers or platforms.

You get a new ISA allowance every tax year. You can put the entire amount into a stocks and shares ISA if you wish.

£20,000 is the maximum amount of new money you can pay into a stocks and shares ISA during the tax year 2026-27. (£9,000 in a JISA ¹). The same limit will apply until the tax year: 2031-2032 at the earliest. The tax year runs from 6 April to 5 April.

The ISA deadline is 5 April every year. That’s the last day of the current tax year you can use up your allowance. You get a new allowance from 6 April. But you can’t roll over unused ISA capacity from the previous year.

If you’ve left things late then know it’s enough to have the cash taken off your debit card and inside your ISA by close of business on 5 April. You don’t need to have actually invested the cash for it to qualify for tax-free protection.

Why open a stocks and shares ISA?

A stocks and shares ISA combines three critical features:

• The ability to invest in assets that are expected to grow faster than cash.

• Legally recognised tax protection. You don’t have to worry about HMRC handing you a large bill because you invested in some sketchy offshore caper.

• Instant accessibility. You can invest in liquid holdings that can be sold to meet unforeseen difficulties or other life events that occur before you reach pension age.

In short, ISAs are a private investor’s top tax-protection shield, along with pensions.

• Find out more about the benefits of ISAs vs SIPPs.

Which taxes are not paid in a stocks and shares ISA?

The main taxes that you do not have to pay on investments in a stocks and shares ISA are:

• Income tax on interest – as earned on bonds and bond funds. The rate is going up 2% across the board from 6 April 2027. 

• Dividend income tax – as paid by shares, equity funds, and property funds. UK REITs and PIAFs pay Property Income Distributions (PIDs) with tax already deducted. You need to claim this back if you hold these fund types in an ISA. 

• Property income tax – Will be charged at a basic rate of 22%, higher rate of 42% and additional rate of 47% from 6 April 2027. Income from UK REITs and PIAFs will be liable for these rates instead of dividend income tax from April 2027. 

• Capital gains tax on profits – as paid on the growth in value of taxable assets when you sell them.

• Inheritance tax – although it’s complicated, and depends on the ISA passing to a spouse or civil partner who’s not been estranged from the deceased.

• Interest and dividends paid straight out of your ISA are not taxed.

• ISA withdrawals aren’t taxed, unlike with a pension. (You will pay a penalty if you withdraw from a Lifetime ISA at the wrong time).

Even more reasons to use an ISA

Investing in a stocks and shares ISA is a no-brainer, even if you think your holdings are too small to be caught up in the taxman’s net.

• Many providers charge you no more for holding an ISA than they do for keeping your assets in a taxable account.

• Though most of us start out small, your investments can grow surprisingly rapidly. Over the years you will outstrip your ability to manage everything within your tax allowances.

• Taxes are going up. On top of explicit increases in dividends and capital gains, other UK tax thresholds are frozen until April 2031. This is a stealth tax, so use your tax shelters while you can.

• You don’t even have to tell HMRC about your ISA transactions. (Believe me, if you ever have to fill in a tedious capital gains tax form, you’ll fall to your knees with thanks that all your investments are in an ISA.)

ISAs can be mission critical

If you’re on a mission to achieve financial independence (FI) before your minimum pension age ² then stocks and shares ISAs will accelerate you towards your goal.

The best course for most will be to combine ISAs and SIPPs to achieve the FI dream. ISA investments can bridge the gap between your FIRE ³ date and your minimum pension age.

The minimum pension age for accessing your personal pension is currently 55. But the government has confirmed it will rise to age 57 from 6 April 2028. 

A stocks and shares ISA is also a great place to stash your pension’s 25% tax-free lump sum so that you can expand the amount of income you can take without being pushed into a higher tax bracket.

Investment ISA types

You can hold investments in the following types of ISA:

• Stocks and shares ISA
• Lifetime ISA (choose a stocks and shares version not cash)
• Junior ISA (again, shares not cash)

ISA providers call stocks and shares ISAs by various names including:

• Shares ISA
• Self-Select ISA
• Ready Made ISA
• Share Dealing ISA
• Investment ISA
• Workplace ISA
• AIM ISA

They’re all stocks and shares ISAs. But they are given different marketing labels depending on how the provider is trying to appeal to consumers.

A stocks and shares ISA may also be a flexible ISA. This means you can potentially replenish withdrawals you make without running down your ISA allowance.

You can invest in a stocks and shares ISA from age 18 onwards by opening an account with your chosen platform (bank, fund manager, IFA or similar).

We’ve put together a list of providers in our cheapest online broker table. These providers enable you to invest in a DIY stocks and shares ISA. You can see who offers a flexible stocks and shares ISA in the left-hand column.

Stocks and shares ISA rules

You can:

• Have as many stocks and shares ISAs as you like.

• Split money across a stocks and shares ISA, lifetime ISA (LISA), cash ISA, and innovative finance ISA, provided you don’t put in more than £20,000 of new money per tax year. Your annual LISA contributions are capped at £4,000, and new cash ISA savings will be capped at £12,000 per year from 6 April 2027, if you remain under age 65 during the tax year. 

• Transfer money from ISAs (of any type) into multiple stocks and shares ISAs with any provider. 

Transferring old ISA money or assets does not:

• Use up your ISA allowance for the current tax year (unless you’re transferring to a LISA – see below.)

You can transfer any amount of your ISAs’ value. Either transfer the whole lot into one ISA, transfer a portion of it into several ISAs, or any other combo you desire.

How to transfer an ISA

You can transfer any amount from any of your stocks and shares ISAs. 

You can transfer your money into different types of ISA. 

However you can only transfer into one new LISA per tax year from non-LISAs. You’re limited to a maximum of £4,000 and you do get the government bonus on that. Transferring from old non-LISAs into a new LISA doesn’t use up your overall £20,000 annual allowance but it does reduce your LISA allowance. 

Transfers to cash ISAs from stocks and shares ISAs will be forbidden from 6 April 2027 if you’re under the age of 65 during that tax year.

You can’t transfer more than £4,000 into a LISA per tax year. That transfer will also use up your LISA allowance for the year. 

Always transfer an ISA to retain the tax-free status of its assets. Don’t withdraw cash and plop it in a new ISA – that uses up your ISA allowance!

Transfer assets in specie (this avoids them being sold to cash) if you are given the option. In specie moves are also known as re-registration.

• See our comprehensive guide on the ISA allowance rules.
• How to transfer a stocks and shares ISA.

Other ISA funding rules

If you invest £9,000 per tax year in a JISA for each of your children that does not reduce your own ISA allowance.

Replacing cash withdrawn from a flexible stocks and shares ISA does not use up your ISA allowance. However you can’t replace the value of shares, or other investment types, that you moved out of the account. It’s the value of your cash withdrawals that you’re entitled to put back. 

It’s worth checking your ISA’s T&Cs whenever you choose a product. Not all of the government’s ISA rules are mandatory. ISA managers do not have to support all features.

Best ISA funds

The main investment vehicles you can include in a stocks and shares ISA are:

• Mutual funds such as OEICs and Unit Trusts 
• Exchange Trade Products such as ETFs and ETCs
• Investment trusts
• Individual company shares (including fractional shares – this got sorted!)
• Individual government and corporate bonds
• Treasury bills

The government maintains a comprehensive list of the complete menagerie. 

If you are new to investing then our passive investing HQ can explain more.

Remember that the assets listed above are riskier than cash – you can get back less than you put in.

It’s worth regularly reflecting on how much risk you might be able to handle as you build your investing portfolio.

Index trackers are an investment vehicle that combine simplicity and affordability. They are recommended by some of the best investors in the world – and us.

• See our list of particularly useful low-cost index funds and ETFs. 

The Financial Services Compensation Scheme (FSCS) provides some investor compensation should your ISA or investment manager go belly up. Do take a look at the link. The scheme is convoluted, to say the least.

Stocks and shares ISA costs

You can expect to pay stocks and shares ISA investment fees that cover:

• Your ISA provider’s management costs
• The cost of owning investment funds
• Dealing fees for trading investments in the open market
• Fees for special events such as transferring your ISA

All fees should be transparently laid out by your ISA provider and investment fund managers.

Charges that can be paid from monies held outside of your ISA, if your provider agrees, include:

• ISA provider’s management costs
• Fees for special / one-off events, such as closing your account

Charges that must be paid from funds held within the ISA include:

• Dealing fees
• The cost of owning investment funds

A flexible ISA doesn’t enable you to replace the cost of ISA charges against your allowance.

Beware of transfer fees that can rack up when your provider charges you ‘per line of stock’. For example they might charge you £15 per company stock and investment fund that you own.

Tax efficiency

You can’t transfer most unsheltered assets straight out of a taxable account and into your stocks and shares ISA wrapper.

You generally have to sell the assets first and buy them again inside your ISA. This is colloquially, if not popularly, known as Bed and ISA.

Selling an unsheltered investment can cost you capital gains tax on your profits. But you can duck that by staying within your capital gains tax allowance and defusing your capital gains.

You can transfer employee share save scheme shares directly into an ISA in some circumstances.

If you want to invest more than you can squeeze into your annual ISA allowance, then research tax efficient investing to avoid building up a capital gains tax time bomb.

Inheriting a stocks and shares ISA

Your surviving spouse or civil partner can receive your ISA assets tax-free upon your death. Although do check that the T&Cs of your particular stocks and shares ISA allow for it to remain tax-free and invested after your passing.

++Monevator Minefield Warning ++ The rules below apply equally to spouses and civil partners but we’ll just refer to spouses for brevity’s sake. Unmarried couples do not benefit from these special inheritance rules. See our article on how unmarried couples can protect their finances.

A surviving spouse is given a one-off ISA allowance that equals the value of your ISAs. 

This is called the Additional Permitted Subscription (APS).

A spouse uses the APS to add the value of their deceased partners’ ISAs into ISA accounts held under their own name. 

For example, if you die with ISA assets worth £50,000, then your spouse is entitled to an APS of £50,000.

Plus they get their usual annual ISA allowance on top.

The APS effectively means your spouse benefits from the tax-free status of your ISA assets after your death.

The APS is worth the higher of:

• Your ISA’s value at the date of your death
• Or the value of your assets when the account is closed. (This assumes no part of the APS has been used up to that point)

Surprisingly, your spouse still benefits from the APS even if your ISAs are willed to someone else. 

In this scenario, your partner can fund their APS from their own money or other inherited assets.

That said, under most circumstances, a surviving spouse will fill their APS simply by transferring their deceased partner’s ISA assets. 

The APS must be used no later than:

• Within three years of the date of your death 

OR

• Within 180 days of the completion of the administration of your estate, if that’s later

The surviving spouse does not have to wait until the estate is settled to use the APS though. 

Managing an inherited ISA

Assets within the deceased’s ISA can be managed by their personal representatives before it is closed. However they can’t make new contributions into the account. 

The ISA continues to grow tax-free until the earlier of:

• Completion of the administration of the estate.
• Closure by your executor
• Three years and one day after your death. The account is automatically closed at this point

If you have multiple ISAs with different providers then your spouse’s APS is divided between them according to the value of the ISAs lodged with each firm. 

Your spouse must claim each portion of their APS from each ISA provider involved.

Again, check that the various providers of your ISAs subscribe to these rules as described. Terms can vary.  

More ISA inheritance rules

(Because there isn’t enough to think about already…)

The other main wrinkle is that your spouse can only receive assets in specie from a stocks and shares ISA by transferring them to the same provider that you held them with.

They can then transfer the assets to another manager once held in their own name.

Another clause is that assets transferred in specie must be the ones held on the date you were told of the death of the investor. (Some might see this rule as pretty heartless. However I don’t know about you but the very first thing I want to know after hearing the news of my partner’s death is the list of non-cash assets they’ve got tucked in their ISAs. Let’s cut to the chase! ⁴)

In specie transfer must be made within 180 days of the assets passing into the beneficial ownership of the surviving spouse.

Your ISAs do not pass on their tax-free status to anyone other than your spouse. 

The tax benefits do not apply if you and your surviving partner were not living together on the date of death, or were legally separated, or in the process of becoming legally separated. 

AIM-ing for even more

Some wealth managers and platforms market AIM ISAs that twin the advantages of a stocks and shares ISA’s tax efficiency with the inheritance tax-elusiveness of Alternative Investment Market (AIM) shares.

Some but not all AIM shares qualify for inheritance tax relief under peculiar government rules that are subject to change.

An AIM ISA is:

• Risky
• Not guaranteed to work out
• Subject to high minimum investments, which add a naughty elite frisson to the escapade

Check out the links above if you need ‘em.

Stocks and shares ISAs aren’t just for the rich

Some people think ISAs are a rich person’s concern. That’s because few have experience of paying capital gains tax, or even income tax on share dividends.

However even modest savings can really add up to a big portfolio in a bull market, at which point the tax protection is invaluable.

Shielding your investment returns from tax like this can make a huge difference to your end result from investing.

Finally, if you want to optimise your ISA to the max then take a look at our cheapest stocks and shares ISA hack. 

Take it steady,

The Accumulator

1. Junior ISA for kids.[↩]
2. The moment you can first crack open your personal pension.[↩]
3. Financial Independence Retire Early.[↩]
4. Sarcasm.[↩]

The biggest change in years is coming to ISAs from 6 April 2027: the cash ISA allowance is being cut to £12,000 if you’re under age 65. The cash ISA allowance will remain at £20,000 if you’re over 65.

The new cash ISA contortions have a knock-on effect upon the stocks and shares ISA, too. HMRC has drawn up the so-called anti-circumvention rules to prevent people from treating their stocks and shares ISAs as proxy cash accounts.

Perhaps it would be better to treat people like adults and allow them to make up their own minds about the best way to use their savings?

Be that as it may, we’ll summarise the 6 April 2027 changes here, and then look at making the most of your ISA allowance with the rules as they stand in the tax year 6 April 2026 to 5 April 2027.

6 April 2027 ISA rule changes

The cash ISA allowance will be £12,000 if you’re under 65.

The cash ISA allowance will be £20,000 if you’re over 65, or turn 65 in the current tax year.

Under-65s won’t be allowed to transfer a non-cash ISA to a cash ISA.

Cash can be held in a stocks and shares ISA.

A 22% flat rate charge will be levied on interest paid on cash held in a stocks and shares ISA. This charge applies to everyone, regardless of age.

The charge will be paid directly by your ISA platform. There’s no need to declare anything on your tax form and the Personal Savings Allowance will not apply.

Money market funds will be categorised as a cash-like asset.

If money market funds are the only investment in a non-cash ISA account then they will be deemed to be a non-qualifying investment. This rule applies to everyone, regardless of age.

A non-qualifying investment must be sold or transferred outside the ISA, by the ISA manager, within 30 calendar days of the date upon which the money market fund became non-qualifying.

The 22% charge does not apply to money market fund interest held in stocks and shares ISAs.

Simply hold less than 100% in money market funds in the investment portion of your stocks and shares ISA to avoid them being categorised as non-qualifying.

The total annual ISA allowance is unchanged at £20,000

Your annual ISA allowance ¹ for the current tax year to 5 April is £20,000.

The allowance will remain frozen at £20,000 until 6 April 2031. (Watch this space!)

It is only cash ISAs that are being capped at £12,000 in 2027.

Once the cash ISA cap cap comes into force, you’ll need to split your money between multiple ISA types if you want to max out your overall ISA allowance. So you could put £12,000 into a cash ISA and £8,000 in a stocks and shares ISA, for example.

The government is also consulting on replacing the Lifetime ISA (LISA) with a new product aimed at first time home buyers.

Existing LISAs will apparently be allowed to continue as per the current rules.

Okay, that’s all the major changes for now. On with the guide!

What is an ISA?

ISA stands for Individual Savings Account. It’s the UK’s most important tax-free account for those savings and investments you want to access before retirement age.

ISAs are called tax-free wrappers because they legally protect the assets inside the account from:

• Income tax on interest paid by cash, bonds, and bond funds. (The tax rate on ‘savings income’ outside of ISAs is going up 2% from 6 April 2027.)

• Dividend income tax on dividends paid by shares and equity funds.

• Capital gains tax paid on the growth in value of assets, such as shares, bonds, and funds.

You don’t even have to declare your ISA assets on your self-assessment tax return. This can save you a ton of tax paperwork.

Your assets remain tax-free as long they’re held in an ISA account… so long as you don’t have the cheek to die.

And you don’t lose out if you move abroad. (At least not from the perspective of the UK government.)

Unlike a pension, your ISA funds are typically ² accessible at any time.

You’re also not charged income tax on withdrawals from an ISA – again unlike a pension. So there’s no danger of being pushed into a higher tax bracket by the wealth you accumulate in your ISA.

• Read up on ISAs Vs SIPPs to learn how best to allocate between them.

ISA accounts: what types are there?

ISA type	Allowance 3	Eligible investments	Notes
Stocks and shares ISA	£20,000	OEICs, Unit Trusts, Investment Trusts, ETFs, individual shares and bonds	Age 18+. Can be flexible, but only cash can be added and withdrawn
Cash ISA	£20,000	Savings in instant access, fixed rate, and regular varieties	18+. Can be flexible. £12,500 cap from 6 April 2027 if under age 65.
Innovative Finance ISA (IFISA)	£20,000	Peer-to-peer loans (P2P), crowdfunding investments, property loans	Age 18+. Can be flexible. Not covered by FSCS compensation scheme
Lifetime ISA (LISA)	£4,000	As per cash ISA or stocks and shares ISA	Open account from age 18 until 40. Pay in until age 50. Only use for buying first home (worth up to £450k), or from age 60, otherwise penalty charge
Junior ISA (JISA)	£9,000 4	As per cash ISA or stocks and shares ISA	Open until age 18. Child may withdraw funds from 18+

The ISA allowances are currently frozen until 6 April 2031.

Help to Buy ISAs are no longer available. If you have one already you can continue to save into it until 30 November 2029.

How much can I put in an ISA in 2026 – 2027?

You can save up to £20,000 of new money into your ISAs during the tax year 6 April 2026 to 5 April 2027.

All £20,000 of your ISA allowance can go into one ISA ⁵ or you can split it across any combination of the following ISA types:

• Cash ISA
• Stocks and shares ISA
• Lifetime ISA (£4,000 annual limit)
• Innovative Finance ISA

You can pay new money into multiple ISAs of the same type. The exceptions are the LISA and JISA. LISAs are restricted to one per year while a JISA allowance can be split between one cash JISA and one stocks and shares JISA.

Aside from the exceptions you can fill your boots. You can open and fund two stocks and shares ISAs in the same year – or seven different cash ISAs if you feel the need – just so long as you don’t pay in more than £20,000 total into all your ISAs within the tax year.

What about money in previous years’ ISAs? That money does not count towards your annual ISA allowance for the current tax year.

For clarity’s sake, we’ll refer to assets in your previous years’ ISAs as old money. Assets in the current tax year’s ISAs we’ll term new money.

Interest, dividends, and capital gains earned on assets already held within an ISA do not count towards your ISA allowance.

Your £20,000 ISA annual allowance is a ‘use it or lose it’ deal. You can’t rollover any of it into the following tax year.

ISA transfers

An ISA transfer enables you to officially switch an ISA’s holdings to another provider. This way you avoid losing the tax exemption on your assets when moving them.

The transfer rules for any ISA opened in the current tax year are straightforward:

• You can transfer any amount of your ISA’s balance from one provider to another. You used to have to transfer the whole balance of your current tax year ISA but that rule has been scrapped.

• You’re free to transfer your ISA at any time to another provider. No buyer’s remorse with ISAs!

• You can currently transfer to any other type of ISA, or even the same type. However, HMRC say that from 6 April 2027 you will no longer be able to transfer from a non-cash ISA into a cash ISA, if you’re under 65.

• You will be able to transfer as you see fit if you’re over 65.

• If you transfer from one type of ISA to another, then you count as subscribing to the receiving ISA type. For example, you transfer from a cash ISA to a LISA.

• If you transfer from a Lifetime ISA to a different ISA type before age 60, you’ll have to pay a nasty penalty charge.

• Beware any transfer fees imposed by your current ISA provider.

• Transfers into a Lifetime ISA must not exceed the £4,000 current tax year limit.

The golden rule with any ISA move is always to transfer your money. Don’t just go “sod it!” and withdraw your cash in a flounce. If you transfer your ISA to another provider, your assets retain their tax-free status. If you just withdraw the money they don’t.

• Find out how to transfer a stocks and shares ISA.

ISA transfer rules for previous years’ ISAs

You can transfer any amount from any of your old ISAs to the same or any other type of ISA.

• Any number of your old ISAs can be consolidated into a new ISA of the same or different type.

• Any of your old ISAs can be split by transferring a portion of the balance into multiple ISAs of the same or different types.

• You can transfer to the same or different providers.

Transferring previous years’ ISAs leaves your current tax year’s allowance untouched.

For example, moving £40,000 from an old ISA into a new ISA still leaves you with a £20,000 ISA allowance for the current tax year.

You could transfer £4,000 into this year’s LISA from an old ISA (of any type), gain the government bonus, and leave your £20,000 allowance entirely intact.

This move maxes out your LISA allowance for the tax year. You must not then exceed that £4,000 LISA limit by transferring more cash into the LISA during the current tax year.

As before, make sure you transfer an ISA. Employ the new provider’s ISA transfer process to maintain your ISA money’s tax-free status. Don’t withdraw cash or re-register assets using any other method.

Withdrawing from an ISA

If you withdraw money from your ISA, can you replace it and not reduce your ISA limit?

Yes, but only if your ISA is designated as ‘flexible’.

If your ISA is not flexible (ask your provider) then a withdrawal reduces your tax-free ISA savings as follows:

• You put £10,000 into your stocks and shares ISA. That reduces your ISA allowance to £10,000.
• Next you withdraw £5,000 from your ISA.
• You can only contribute another £10,000 into your ISAs this tax year.
• Put that money in, and you’ll have added £15,000 to your ISAs in total by the end of the tax year.

Obviously £15,000 is less than £20,000, and so you’ll not have maximised your annual allowance.

Enter Flexible ISAs, which get around this problem.

Flexible ISAs

Flexible ISAs let you withdraw cash and put it back in again later the same tax year without losing any of your current tax year’s ISA allowance or reducing how much you’ve saved tax-free.

The following ISA types can be designated as flexible:

• Stocks and shares ISA
• Cash ISA
• Innovative Finance ISA

Flexibility is not an inalienable right. An ISA provider must decide to offer it and to deal with the administrative faff. Providers may offer flexible and inflexible versions of the same ISA type.

Here’s how the flexible ISA rules work:

• ISA allowance = £20,000
• Contributed so far = £10,000
• Remaining contribution = £10,000
• You choose to withdraw = £5,000

In this case you can still pay £15,000 into your flexible ISA before the ISA deadline at the end of the tax year because:

Remaining ISA allowance = £15,000 (£10,000 remaining contribution + £5,000 replacement of the withdrawal.)

If your ISA was inflexible then your remaining ISA allowance would be just £10,000. In other words, you couldn’t replace the withdrawn amount and it would have lost its tax-free status.

Flexible ISAs: contributing factors

Contributions made to an ISA in the same tax year as withdrawals work in this order:

1. Replace the withdrawal.
2. Reduce your remaining ISA annual allowance.

Withdrawals from an old flexible ISA can be replaced in the same tax year. This won’t reduce your current ISA allowance, provided the ISA is no longer active. ⁶

When flexible ISAs contain assets from previous tax years and the current tax year it works like this:

Withdrawals

1. From money contributed in the current tax year.
2. From money contributed in previous tax years.

Replacement contributions

1. Replace previous tax years’ withdrawals.
2. Replace current tax year withdrawals.
3. Reduce your remaining ISA annual allowance.

All replacement contributions must happen in the same tax year as the withdrawal.

Some providers say the withdrawal has to be replaced in the same ISA account you took it from.

More quirky than an octogenarian British actor

The ISA rules enable you to put your withdrawn money back into different ISA type(s) with the same provider, if they make that facility available.

Check your provider’s T&Cs. Or send them thousands of emails in BLOCK CAPITALS until they respond.

A flexible stocks and shares ISA allows you to replace the value of cash withdrawn. You can’t replace the value of shares, or other investment types that you moved out of the account, should they afterwards change.

You can sell down your assets, withdraw the cash, and then replace that cash later in the tax year, and buy more assets with it.

Dividend income should also be flexible in a flexible ISA scenario.

If you transfer your flexible ISA to another provider, then check its product is also flexible.

You may lose the ability to replace withdrawals if you don’t replace them before you transfer a flexible ISA. Again, this is determined by your provider’s T&Cs rather than the rules. (Subject them to a paid social media campaign to get an answer on this one.)

If your withdrawals result in your account being closed, your provider can allow you to reopen your flexible ISA in the same tax year and replace the money. That applies to old and new ISA accounts.

Again, check with your provider. (Via a billboard installed outside their office if need be.)

Flexible ISA hack to build your tax-free ISA allowance

1. Open a flexible, easy access cash ISA that accepts ISA transfers.
2. Transfer your non-flexible old ISAs into the flexible ISA.
3. Your flexible ISA now accommodates the value of the old ISAs – say £40,000.
4. If your flexible ISA doesn’t pay table-topping interest then withdraw your cash and spread it liberally among the humdinger savings accounts of your choice, or an offset mortgage.
5. Move your cash back into the flexible ISA by 5 April of the current tax year. Fill as much of the current year’s ISA allowance as you can, too. For instance another £20,000.
6. In our example, you now have £40,000 + £20,000 = £60,000 tax-free and flexible.
7. From April 6 of the new tax year: withdraw your cash and liberally spread it.
8. Repeat as required – because this operation will be severely curtailed when the new cash ISA limit comes in.

This method builds up a large and flexible tax-free shelter. One that could prove valuable later in life, when you have more money to tuck away.

For example, perhaps it could become a place to shelter and grow your 25% tax-free pension cash when you take it. This could be instantly transferred into a stocks and shares ISA, come the day.

Or maybe you’ll sell a business, or receive some other windfall.

Watch out for the £120,000 FSCS compensation limit (see below). Open a new flexible ISA with a different authorised firm before you go over that line.

What happens if you exceed the ISA allowance?

HMRC should get in touch if you exceed the ISA allowance. You may be let off for a first offence, but otherwise it will instruct your ISA provider on what action to take.

Action is likely to include your extraordinary rendition to an offshore black site where you will be forced to read HMRC compliance manuals for the rest of your life.

Alternatively, HMRC may require overpayments and excess income to be removed from your account. And also invite you to pay income tax and capital gains (potentially on all assets in the ISA) from the date of the invalid subscription until the problem is fixed.

Eek!

Your ISA provider may also charge you a fee for the hassle.

You can similarly get into hot water for dropping new money into your ISA as a UK non-resident or for breaking the age restrictions.

You can call HMRC on 0300 200 3300 to discuss all this.

Just don’t expect them to admit to the Deep State stuff. Open your eyes sheeple! [Editor’s note: we’re joking.]

FSCS compensation scheme

What if your ISA provider goes bust and your money can’t be recovered? In that case the Financial Services Compensation Scheme (FSCS) waits in the wings.

• Cash – You can claim up to £120,000 compensation on cash held with each authorised firm.

• Stocks and shares – It’s more complicated, quelle surprise. But you can claim up to £85,000 compensation on investments held with each authorised firm.

• Innovative Finance – Not covered by the FSCS. You’re on your own.

Watch out for the definition of an ‘authorised firm’. Often multiple brand names sit under the same authorised firm umbrella.

For example, if you have cash at HSBC and First Direct then you’re only covered for £120,000 across both. They are one and the same authorised firm.

Investments parked at the same bank should be covered for another £85,000. That’s on top of your cash.

• Check the FCA’s Financial Services Register to see what services your provider is authorised for.
• Brands with matching FRN numbers (also known as registration numbers) count as the same authorised firm, not two separate firms. In other words, your accounts with both firms shelter under a compensation limit of £120,000 (cash) / £85,000 (investments).

Inheriting an ISA

The tax-free benefits of an ISA can be passed on to a surviving spouse or civil partner. 

(We’ll refer to a ‘spouse’ in the rest of this section but the ISA inheritance rules apply equally to a civil partner. Unfortunately they do not apply to unmarried partners). 

Upon death, all types of ISA (except a JISA) transform into a ‘continuing account of a deceased investor’. 

This so-called ‘continuing ISA’ can then grow tax-free until the deceased’s affairs are settled. 

The tax benefits of the deceased ISAs transfer to their spouse using an Additional Permitted Subscription (APS). 

The APS is a one-time ISA allowance that enables the surviving spouse to expand their ISA holdings up to the value of the deceased’s ISA accounts. 

By this mechanism, the tax-free status of the deceased’s ISAs are passed on to their spouse. 

Unfortunately, the rules descend into a bureaucratic quagmire from there. 

ISA inheritance rules for the Additional Permitted Subscription

A surviving spouse qualifies for the APS even if the ISAs are actually willed to someone else. 

However, a spouse does not qualify if the couple are not living together at the time of death, or the marriage has broken down, they are legally separated, or in the process of being legally separated. 

The value of the APS is the higher of:

• The ISA’s worth at the date of death
• Its value when the continuing ISA account is finally closed (assuming part of the APS hasn’t already been used)

The APS must be claimed separately from each of the deceased’s ISA providers. 

You can choose which of the two valuation options above apply to each ISA provider. You don’t have to pick one option that applies across the board with every provider

The APS can be used from the date of death. 

Although you’d normally expect an APS to be funded by the inherited ISA assets, this is not necessary. An APS can be fulfilled by any assets the spouse owns. 

The APS must be used within:

• Three years from the date of death
• 180 days after the completion of the administration of the estate, if that’s later. 

The APS does not interfere with the spouse’s own ISA allowance. They get that as normal. 

APS subscriptions count as previous tax year subscriptions.

You should check the terms and conditions of all your ISAs to ensure they adhere to APS provisions. ISA providers aren’t automatically obliged to comply with the APS rules. 

APS rules per ISA provider

One common restriction is that the spouse must use their APS with the same provider that runs the deceased’s ISA account. This leads to extra complications, as we’ll cover below. 

As mentioned, the APS is divided into separate amounts that align to the value of the deceased’s continuing ISA accounts – as held with each of their providers.

For example:

• A continuing ISA worth £100,000 is held with provider A
• A continuing ISA worth £50,000 is held with provider B

The surviving spouse can now fund up to £100,000 of APS in ISAs with provider A, and up to £50,000 with provider B. 

You can’t fill ISAs worth £75,000 with both providers. You can only ‘spend’ up to the limit of each APS per provider. 

However, you can split each APS between any number and type of ISA per provider. (Although there are restrictions on the Lifetime ISA.)

You can fill both new and existing ISAs with each provider. 

Transferring inherited ISA assets

In specie transfers from a continuing stocks and shares ISA must be made within 180 days of the assets passing into the beneficial ownership of the surviving spouse.

The in specie transfer can only be made to a stocks and shares ISA held by the spouse with the continuing ISA’s provider. 

The assets must be the same as those held on the date of death. 

Alternatively you can sell the investments for cash. The money can then be used to fund the APS with slightly fewer restrictions. 

You can always transfer your ISAs to another provider as normal – after you’ve used your APS. 

Lifetime ISA APS restrictions 

You can’t open a new Lifetime ISA unless you’re aged between 18 to 40. 

You can’t pay into an existing Lifetime ISA unless you’re under 50. 

The APS does use up your £4,000 annual Lifetime ISA allowance. 

You can’t pay APS into a Lifetime ISA if you’ve already paid into one in the current tax year. 

A continuing ISA’s tax-free growth limits

Before the deceased assets are transferred via the mechanism we’ve just described, they grow tax-free in continuing ISAs until:

• Completion of the administration of the estate
• The accounts closure by the deceased’s executor
• Three years and one day after the date of death. Then the account can be closed by the ISA provider 

The earliest of these dates applies. 

The value of the deceased’s ISA holdings count towards their estate. The tax-free benefits are only passed to a surviving spouse. 

Inheritance ISAs are a marketing label not an additional type of ISA. Every ISA can be inherited as described above. But please check your provider’s T&Cs for additional restrictions. 

What happens to my ISA if I move abroad?

You can still put new money into your ISA for the remainder of the tax year when you stop being a UK resident. But you can’t contribute new money again until your residential status changes back.

Your ISA assets will continue to grow free of UK tax. But watch out! Your new country of residence may demand a slice.

In addition:

• You should still be able to transfer ISAs without losing your tax exemption.
• Ditto for withdrawing money from a flexible ISA and replacing it.
• You can still inherit an ISA using the APS even if you’re resident abroad.

Check with your provider before doing anything, just to be safe.

You should also tell your ISA provider when you’re no longer a UK resident. The UK means England, Wales, Scotland, and Northern Ireland. The Channel Islands and the Isle of Man are excluded.

If you split your time between the UK and other territories you can do a residency test. This will determine your status. Fun!

You don’t lose your ISA annual allowance if you’re a Crown employee serving overseas, or their spouse or civil partner.

A few final ISA wrinkles

• Each ISA can be held with the same or a different provider.

• Payment into a JISA uses up the child’s allowance, not yours.

• You can now hold fractional shares in a stocks and shares ISAs. They are ‘fractional interests’ in this list of qualifying investments.

• Some providers have all-in-one cash ISAs. With these you can split new money between instant access and fixed-rate options, within a single ISA wrapper.

• A workplace ISA counts as a stocks and shares ISA.

• You can only claim the government bonus when buying your first home from a Help to Buy ISA or a Lifetime ISA. Not both.

Any questions?

Well, we’re sure this brief post has cleared everything up… But do let us know in the comments if we’ve missed a bit.

You can also check out the government’s official ISA pages if you’re a completist!

Take it steady,

The Accumulator

Note: This article on the ISA allowance was updated in July 2026. Reader comments below may refer to older ISA rules. Check the date to be sure.

1. Also known to the government but to nobody else as the ‘subscription limit’.[↩]
2. Exceptions: funds in a Junior ISA before the child reaches age 18, Lifetime ISA, Innovative Finance ISA loan lock-ins, and fixed-term/regular saver Cash ISAs where you’ll pay various penalties for early release.[↩]
3. Max per year, per person.[↩]
4. per child[↩]
5. The max contribution into a LISA is £4,000 a year.[↩]
6. That is to say you’re no longer filling it with new money.[↩]