Usually no, as long as your interest stays under your allowance. In 2026/27, basic rate taxpayers can earn £1,000 of interest tax-free, higher rate taxpayers £500 and additional rate taxpayers nothing. Interest inside an ISA does not count at all.
Most people never need to do anything, because your bank tells HMRC about your interest and HMRC handles any tax that is due. It still pays to know the limits, since a decent interest rate can take a modest balance over them faster than you might expect.
Three allowances, stacked
GOV.UK sets out three that can apply to savings interest in a tax year, from 6 April to 5 April.
| Allowance | How much |
|---|---|
| Unused Personal Allowance | Up to £12,570 |
| Starting rate for savings | Up to £5,000, if other taxable income is under £17,570 |
| Personal Savings Allowance, basic rate | £1,000 |
| Personal Savings Allowance, higher rate | £500 |
| Personal Savings Allowance, additional rate | £0 |
The starting rate shrinks by £1 for each £1 of other income above your Personal Allowance. So it matters mainly to people on lower incomes.
Your band is set by adding your interest to your other income. Someone earning £49,800 who gets £800 of interest has total income of £50,600, over the £50,270 line, so their allowance is £500 and not £1,000. See how the income tax slices work if that needs unpacking.
Three savers, worked through
Earning £16,000, with £200 of interest
This is GOV.UK's own example. Wages are £3,430 above the Personal Allowance, which cuts the £5,000 starting rate to £1,570. The £200 of interest fits well inside it, as well as inside the Personal Savings Allowance. Tax due: nothing.
Earning £30,000, with £1,300 of interest
A basic rate taxpayer with no starting rate left. The first £1,000 is free, and £300 is taxed at 20%. Tax due: £60, which again matches GOV.UK's example for that interest figure.
Earning £55,000, with £800 of interest
A higher rate taxpayer, so the allowance is £500. The remaining £300 is taxed at 40%. Tax due: £120.
Earning £10,000, with a large balance
Here all three allowances work together. Income of £10,000 leaves £2,570 of Personal Allowance unused. The full £5,000 starting rate is available, because other income is under £17,570. Then there is the £1,000 Personal Savings Allowance. By our arithmetic, that is £8,570 of interest before any tax is due, which is why a retired person living on a small income and a large cash balance may owe nothing at all.
How much would you need saved?
The balance that reaches the limit depends entirely on the rate you get. These rates are illustrative, not current market offers.
| Interest rate | To reach £500 | To reach £1,000 |
|---|---|---|
| 3% | £16,667 | £33,334 |
| 4% | £12,500 | £25,000 |
| 5% | £10,000 | £20,000 |
Our arithmetic, simple annual interest. Remember that HMRC adds together the interest from all your accounts.
A fixed-rate bond can make this less even than it looks, so check when your account pays or credits its interest. A provider can explain the timing for its own product.
What is changing in April 2027
Using those rates, the £60 bill above would become £72, and the £120 bill would become £132, if the same interest were earned in 2027/28. The tax applies only above the allowance, so someone within their allowance sees no change at all.
The same newsletter also dropped a plan you may have read about. The annual cash ISA limit of £20,000 will be kept from 6 April 2027, and the regulations that would have cut it to £12,000 are being revoked. These plans have moved around, so check GOV.UK before you rely on what you read, including here.
ISAs in brief
Interest in an ISA doesn't usually count as taxable savings interest. For 2026/27, GOV.UK gives the overall ISA limit as £20,000 across cash, stocks and shares, innovative finance and Lifetime ISAs. Rules vary between those types. We aren't telling you which one suits you; that depends on your plans and how soon you might need the money.
How you actually pay
HMRC usually collects the tax through your tax code, which can also be adjusted to recover the previous year's unpaid tax or to include an estimate for this year. That is one reason a tax code changes without warning. If you have no code, HMRC may send a Simple Assessment letter instead.
- Already file Self Assessment? Report your interest on your return.
- More than £10,000 of interest? HMRC will require a return, and you must register if you don't already file.
- Joint account? HMRC splits the interest equally between the holders.
If you get a tax calculation letter, check it against your statements and contact HMRC if something looks off. Mistakes in the estimates can happen.
A word on the money itself: savings kept for emergencies often sit here, so how much to keep in cash is a related question. This is general information rather than tax advice. If your interest is large or your income complicated, a qualified tax adviser can look at your whole picture.