Most people pay none: three allowances stack first. Who actually pays, how HMRC collects through your tax code, and when Self Assessment applies.
Most people pay no tax on savings interest, and the reason is structural: three allowances stand in front of it, applied in a fixed order — any Personal Allowance your wages have not used, then a starting rate for savings worth up to £5,000 on low incomes, then the Personal Savings Allowance of £1,000 at basic rate or £500 at higher rate. Only interest left after all three is taxed, and interest inside an ISA is never counted at all. The savings interest tax calculator runs your own figures; this page is the words.
| Tax/source year | 2026/27 |
|---|---|
| Region | UK-wide: savings interest is taxed on the UK bands and thresholds in every UK nation, including for Scottish taxpayers |
| Account rates | Never assumed. Any interest rate in a savings calculation is an input you set, stated beside the result. |
| Your other income | Wages and pension income decide how much Personal Allowance and starting rate are left for interest, and which Personal Savings Allowance band applies. |
|---|---|
| The interest itself | Interest counts towards the income that sets your band, so a large interest year can shrink the allowance that was meant to cover it. |
| The account's wrapper | The same balance at the same rate is taxed outside an ISA and untouched inside one; the wrapper, not the rate, decides whether the allowances are needed. |
| Run your own figures on the savings hub | calculator next step |
|---|---|
| Review calculation sources and methodology | source context |
| What is not decided here | PayBreakdown does not decide payroll correctness, lender approval, benefit entitlement or employer compliance, and does not give regulated financial, mortgage, debt, tax, payroll or legal advice. |
|---|
Nobody sends HMRC their bank statements. Banks and building societies report the interest they pay, and what happens next depends on your situation. If you are employed or receive a pension, HMRC changes your tax code so the tax comes out of your pay automatically — and the figure it uses is an estimate of this year's interest based on what you received last year, corrected later if the estimate was off. If you already complete Self Assessment, the interest goes on your return instead. If neither applies, HMRC writes to tell you whether anything is owed and how to pay it.
Earning taxable interest does not by itself put you into Self Assessment — the tax-code route exists precisely so it does not have to. The registration requirement arrives at scale: GOV.UK's rule is that you need to register for Self Assessment if your income from savings and investments is over £10,000 in a year. Below that, filing is only involved if you file already for another reason.
The starting rate for savings shrinks pound for pound as other income rises above the Personal Allowance and is gone at £17,570 — and the Personal Savings Allowance is set by the band your total income lands in, counting the interest itself. Interest that pushes total income over the higher-rate threshold halves the allowance that was covering it. The calculator draws that cliff for your own figures, including what a pension contribution taken before tax does to it.
This is educational guidance on how UK pay and tax work. It does not decide payroll correctness, HMRC treatment, lender approval, benefit entitlement or employment rights, and it is not regulated financial advice. Where a figure matters, check it against your payslip, your HMRC account, or the official guidance linked above.
No. Interest earned inside an ISA is tax-free without limit and never uses any of the allowances — it sits outside the calculation entirely. The annual limit is on what you pay in, not on the interest it earns.
No — savings interest is taxed on the UK-wide bands and rates for every UK taxpayer, and the Personal Savings Allowance follows the UK thresholds too. Scottish rates apply to wages and pensions, not to interest.
Last updated 2026-08-28. Checked by Sean Elsmore. Rates last checked against GOV.UK on 2026-08-07. Estimates are for planning and should be checked against official records where the decision matters.