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🇬🇧 UK-only · 2026/27 Tax Year · Free

ISA Calculator 2026/27

Split your £20,000 ISA allowance across Cash, Lifetime (LISA), and Stocks & Shares ISAs. Project your tax-free growth and track your 25% government bonus.

✓Instant chart projection✓LISA 25% bonus included✓Free — no sign-up✓UK rates 2026/27

Allocate your £20k Allowance

Total Allocated£20,000 / £20,000

Cash ISA

⚠️ 2027 Reform: Cash ISA deposits will be capped at £4,000/yr starting April 2027.

Lifetime ISA (LISA)

Stocks & Shares ISA

Projected Total Value in 10 Years

£34,734

Total Profit

+£14,734

Free LISA Bonus

+£1,000

Growth Projection

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What Is the ISA Allowance for 2026/27?

The ISA allowance is the maximum amount of money you can deposit across all your Individual Savings Accounts (ISAs) in a single tax year without paying any tax on the interest or capital gains. For the 2026/27 tax year, this limit remains at £20,000. You can split this allowance any way you like across a Cash ISA, Stocks & Shares ISA, or an Innovative Finance ISA.

However, it is crucial to understand how much you can afford to lock away. You can use our Take-Home Pay Calculator to work out your exact monthly net pay and budget your ISA contributions accordingly.

⚠️ 2027 Warning — Cash ISA Limit Dropping to £4,000

As announced in the Autumn Budget, starting from April 2027, the rules are changing. While your total ISA allowance will stay at £20,000, there will be a strict sub-limit on Cash ISAs of just £4,000 per year. The remaining £16,000 will only be allowed to be invested in UK-focused Stocks & Shares ISAs. If you prefer holding cash, the 2026/27 tax year is your final opportunity to deposit up to £20,000 in a pure Cash ISA.

ISA vs Taxable Savings — How Much Do You Actually Save?

With interest rates currently high, millions of savers are breaching their Personal Savings Allowance (PSA) and facing unexpected tax bills. Basic rate taxpayers can earn £1,000 in tax-free interest outside an ISA, while higher rate taxpayers get just £500.

Any interest earned inside an ISA never counts towards this limit. If you have significant cash savings, shifting them into an ISA is the easiest way to legally protect your returns from HMRC. You can check if you are currently at risk of being taxed on your normal bank accounts by using our Savings Interest Tax Calculator.

If you are saving for a first home or retirement, you should also consider a Lifetime ISA (LISA). The LISA has a strict £4,000 annual limit (which counts towards your £20,000 total), but the government will instantly add a 25% bonus to your contributions. You can model your exact bonus and property purchasing power using our Lifetime ISA Calculator.

Tax-free saving

Frequently asked questions

How much can I put in an ISA in 2026/27?
The ISA allowance for the 2026/27 tax year remains at £20,000. You can put this entire amount into a single ISA or split it across different types (e.g., Cash, Stocks and Shares, Lifetime ISA). Note that from April 2027, a new £4,000 sub-limit will apply to Cash ISAs.
Can I have more than one ISA in the same tax year?
Yes, recent rule changes mean you can now open and pay into multiple ISAs of the same type in a single tax year, provided you do not exceed your total £20,000 allowance across all of them.
What is the Lifetime ISA bonus and how does it work?
The Lifetime ISA (LISA) offers a 25% government bonus on your contributions. You can contribute a maximum of £4,000 per year, which means the maximum bonus you can receive is £1,000 annually. The funds must be used for a first home or retirement at age 60.
Is ISA interest tax-free? Does it count towards my Personal Savings Allowance?
All interest and capital gains earned within an ISA are completely tax-free. They do not count towards your Personal Savings Allowance (PSA), meaning you can earn unlimited interest in an ISA without paying any tax.
What happens if I go over my ISA allowance?
If you accidentally pay more than £20,000 into your ISAs in a single tax year, HMRC will contact you after the end of the tax year to arrange a correction. You should not attempt to fix it yourself by withdrawing the money, as you may lose the tax-free status.
What is a Cash ISA vs a Stocks and Shares ISA — which is better?
A Cash ISA holds your money in cash and pays a set interest rate, meaning your capital is secure but growth is generally lower. A Stocks and Shares ISA invests your money in the stock market, which offers higher potential long-term returns but comes with the risk that your investments could go down in value.
Can I transfer my ISA without losing the allowance?
Yes. To retain the tax-free status, you must use the official 'ISA transfer' process provided by your new provider. If you simply withdraw the cash and pay it into a new ISA yourself, it will count towards your current year's £20,000 allowance.
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