Bureau of Wealth

ISA Allowance Calculator 2026/27

By the Bureau of Wealth team Updated

This calculator is general information, not financial advice. Check your own figures with the provider or a qualified adviser before acting on them.

Add up what you have paid into each type of ISA since 6 April to see how much allowance is left, and how much a month would use it before the tax year ends.

Using 2026/27 rates rates checked 14 September 2026

Enter what you have paid in since 6 April. Transfers of previous years' ISA savings do not count.

Up to £4,000 a year, counted in your allowance.

Check the highlighted fields to see your results.

What this calculator assumes

  • The figures are for the 2026/27 tax year, which runs from 6 April 2026 to 5 April 2027, using the allowances published on GOV.UK.
  • Enter money you have paid in this tax year. If you move ISA savings to another provider, use the provider's transfer process: GOV.UK warns that if you withdraw the money yourself you will not be able to reinvest that part of your tax-free allowance.
  • The Lifetime ISA bonus shown is the 25% the government adds to what you pay in, up to £1,000 a year. It is paid by your provider and does not itself count towards your allowance.
  • The monthly amount spreads what is left evenly over the calendar months remaining up to and including April. It does not add interest or investment growth.
  • Withdrawals are not included. Check your provider's terms for how taking money out affects what you can pay back in this tax year.

You might also want to check

  • ISA vs Pension Calculator

    Saving for retirement? Compare what an ISA and a pension would leave you with after tax before you use the rest of your allowance.

  • Savings Goal Calculator

    Working towards a set amount inside your ISA? See how much to save each month to reach it by your deadline.

How the ISA allowance works

An Individual Savings Account lets you save or invest without paying tax on the interest, dividends or gains. Each tax year you can pay up to £20,000 into ISAs in total. GOV.UK sets out four kinds you can use: cash ISAs, stocks and shares ISAs, innovative finance ISAs and Lifetime ISAs. You can put the whole £20,000 in one account or split it across several.

The calculator adds up what you have paid into each kind since 6 April, takes that away from £20,000, and tells you how much is left. It also checks the Lifetime ISA limit and works out the bonus you have earned on it.

A worked example

Say that by 14 September 2026 you have paid £5,000 into a cash ISA, £8,000 into a stocks and shares ISA and £4,000 into a Lifetime ISA. You have used £17,000, so £3,000 of allowance is left. Your Lifetime ISA payments earn the maximum £1,000 bonus. Spreading the remaining £3,000 over the eight months from September to April means saving £375 a month to use it all by 5 April 2027.

If instead it were January and you had paid in £3,000, including £1,000 into a Lifetime ISA, you would have £17,000 left, a £250 bonus so far, and four months to use it.

The Lifetime ISA

You can pay up to £4,000 a year into a Lifetime ISA, and that £4,000 counts towards your £20,000 allowance. The government adds a 25% bonus, up to £1,000 a year. You must make your first payment before you turn 40, and you can keep paying in until you are 50.

The money is meant for a first home or later life. You can withdraw without a charge to buy your first home costing £450,000 or less, once you are 60, or if you are terminally ill with less than 12 months to live. Any other withdrawal carries a 25% charge, which takes back the bonus and some of your own money, so a Lifetime ISA only suits money you are confident you will use for one of those purposes.

Junior ISAs have their own limit

A Junior ISA is an account for a child under 18, with a limit of £9,000 for 2026/27. Parents or guardians with parental responsibility open and manage it, but the money belongs to the child, who can manage the account from 16 and withdraw from 18.

Making the most of the allowance

The allowance resets when the new tax year starts on 6 April, so money you meant to shelter needs to go in by 5 April. If a lump sum is not possible, a regular monthly payment is an easy way to build towards it. Before choosing between an ISA and a pension for long-term saving, the ISA vs pension calculator compares what you would keep from each after tax.

Frequently asked questions

What is the ISA allowance for 2026/27?

It is £20,000 for the 2026/27 tax year, according to GOV.UK. You can use it all in one ISA or split it across several, including up to £4,000 in a Lifetime ISA.

Does a Lifetime ISA count towards my £20,000?

Yes. The Lifetime ISA limit of £4,000 counts towards your annual ISA allowance. The 25% bonus the government adds is paid on top and is not counted as a payment from you.

How do I move an ISA without losing allowance?

Ask your new provider to transfer the savings for you. GOV.UK says that if you withdraw the money without using the transfer process, you will not be able to reinvest that part of your tax-free allowance again.

Can I withdraw from a Lifetime ISA without a penalty?

You can for a first home costing £450,000 or less, from age 60, or if you are terminally ill with less than 12 months to live. Otherwise there is a 25% withdrawal charge.

How much can go into a Junior ISA?

The Junior ISA limit is £9,000 for the 2026/27 tax year. The account is opened and managed by a parent or guardian, but the money belongs to the child, who cannot withdraw it until they turn 18.

Sources

Figures come from institutions millions of people rely on. How we keep calculators accurate.