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  • Writer's pictureJordan White

What happens to your ISA at the end of the tax year?

One of the fundamentals of good financial planning is to make use of your annual ISA allowance.

Thanks to its status as a tax-efficient product, funnelling money into an ISA protects your cash from tax, helping it grow faster and giving you more back when you want to withdraw your money.

If this is your first year holding an ISA, you might be wondering what happens when the tax year ends.

The ISA Basics

  • You have an annual ISA allowance of £20,000.

  • If you don’t use up all your allowance by the end of the tax year, you lose it.

  • Your £20,000 allowance can be spread across the 4 types of ISAs; Cash ISA, Stocks and Shares (Investment) ISA, Innovative Finance ISA and Lifetime ISA (LISA)

  • You can only pay into one of each type of ISA each year

  • Every tax year, you get a new £20,000 allowance.

  • The tax year runs from April 6th to April 5th the following year.

Most people will have a Cash ISA or a Stocks and Shares ISA. If you’re specifically saving to buy a home, then you might have a Lifetime ISA.

What happens at the end of the tax year?

Think of each tax year as a countdown clock. When the tax year ends, the clock simply resets. The new tax year starts the day after, and you can start using a new £20,000 allowance right through to April 5th the following year.

Your ISA that was ‘active’ - the one you were paying money into - on April 5TH is still open. It doesn’t just close. There is no ‘maturity’ date unless you’re using a fixed rate Cash ISA.

The tax benefits of your ISA continue for as long as your ISA is open, beyond the end of the tax year.

ISA Options at the start of a new tax year

Continue paying into your ISA

If you’re happy to continue putting money into it, this becomes your ISA for the current tax year. It simply rolls over. There’s nothing to approve or sign. As soon as you make a payment into it, you’ve assigned it as your ISA for the tax year.

Open a new ISA

Your alternative option is to basically put that ISA aside and open a new ISA with a different provider.

Let’s use an example to demonstrate:

In the current tax year, you have a Stocks and Shares ISA and you’ve contributed £5000 of your annual £20,000 allowance to it.

The new tax year starts. You decide you want to open a new ISA with a different provider. That new ISA becomes your ‘active’ ISA that you can pay in to.

You can no longer pay into your ISA from the previous year. If you do, you may face a penalty charge.

Your old ISA is still open and able to benefit from growth. You are also allowed to withdraw money from it whenever you like. If your particular ISA pays you dividends, these will continue to be paid to you.

Transfer your old ISA

If you do choose to open a new ISA, you can transfer your previous ISA(s) to your current ISA. It won’t affect your current annual allowance.

Usually, transferring old ISAs keeps things simple as opposed to the admin of keeping an eye on various different ISAs over the years.

Transferring an ISA should usually be free but always check with your provider.

Let’s say you had an ISA last year with a value of £5,000.

You open a new ISA this year and start contributing money. At the same time, you decide to transfer last year’s ISA to this new ISA. That £5,000 does not reduce your £20,000 allowance by £5,000.

It’s simply taking your previous yearly contributions and consolidating them.


When we're thinking of saving or investing, making use of our ISA annual allowance is good financial planning.

Regarding the end of the tax year, the main thing to think about is maximising your contributions within your allowance before the tax year ends, otherwise you'll lose it.

There's no need to do anything else in terms of admin.


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