With savings rates higher than they have been in over a decade, millions of UK savers are now earning enough interest to trigger a tax liability for the first time. If you have significant cash savings outside an ISA, understanding how the Personal Savings Allowance works — and when you might owe HMRC — is essential for avoiding unexpected tax bills. This guide explains the allowances that protect most savers and what happens when you exceed them.
The good news is that the vast majority of savers pay no tax on their interest, thanks to a combination of the Personal Savings Allowance, ISA sheltering, and the starting rate for savings. But with easy-access accounts offering 4-5% and fixed-rate bonds exceeding 5%, it takes only £20,000–£25,000 in taxable savings accounts to breach the basic rate PSA of £1,000. Higher rate taxpayers hit their lower £500 limit even faster.
What is the Personal Savings Allowance and how much do I get?
The Personal Savings Allowance (PSA) is the amount of savings interest you can earn each tax year without paying tax on it. The amount you receive depends entirely on your income tax band — not on the amount you have saved or where you hold your savings. It was introduced in April 2016 and has remained unchanged since.
- Basic rate taxpayers (income up to £50,270): £1,000 of tax-free interest per year
- Higher rate taxpayers (income £50,270–£125,140): £500 of tax-free interest per year
- Additional rate taxpayers (income above £125,140): £0 — no Personal Savings Allowance at all
Interest above the PSA is taxed at your marginal rate: 20% for basic rate taxpayers, 40% for higher rate, or 45% for additional rate. The tax is collected either through an adjustment to your PAYE tax code or via Self-Assessment — you do not need to pay it directly to the bank.
An important subtlety: your income tax band is determined by your total income including the savings interest itself. Someone earning exactly £50,270 in salary might assume they are a basic rate taxpayer with a £1,000 PSA. But if their savings interest pushes total income above £50,270, the portion above the threshold is taxed at the higher rate and their PSA drops to £500 on the excess.
What is the starting rate for savings?
Separate from the PSA, there is a “starting rate for savings” of 0% on up to £5,000 of savings interest. This is available to people whose non-savings income (salary, pension, rental income) is below £17,579. The £5,000 band reduces by £1 for every £1 of non-savings income above the Personal Allowance of £12,579.
In practice, this mainly benefits people with very low earned income — part-time workers earning under £17,579, retirees living mostly on savings, or students with minimal employment. If your salary is £12,579 or more, the starting rate band is fully used up by your non-savings income and provides no additional benefit. It stacks with the PSA, so in the best case a non-earning person could receive up to £6,000 of tax-free savings interest.
If you are a retiree with only the State Pension (roughly £11,500 in 2026/27) and savings interest, you benefit significantly from the starting rate. Your non-savings income is below £12,579, leaving the full £5,000 starting rate band available — plus the £1,000 PSA. This means you could earn up to £6,000 in savings interest tax-free.
How do ISAs protect savings interest from tax?
Interest earned within any ISA (Cash ISA, Stocks & Shares ISA, Innovative Finance ISA, or Lifetime ISA) is completely tax-free and does not count towards your Personal Savings Allowance. There is no limit to how much interest you can earn inside an ISA — only the annual contribution limit of £20,000 constrains how much you can shelter each year. Previous years' ISA holdings continue earning tax-free indefinitely.
For higher and additional rate taxpayers, ISAs become increasingly valuable because the PSA is so low (£500 or £0). A higher rate taxpayer with £100,000 in a 5% savings account earns £5,000 in interest, of which £4,500 (above the £500 PSA) is taxed at 40% — a bill of £1,800. Moving that same cash into ISAs over time eliminates this tax entirely.
The strategic priority is clear: maximise your ISA allowance each year before holding significant cash in taxable savings accounts. Even if the ISA interest rate is slightly lower than the best non-ISA rate, the tax saving usually more than compensates. A 4.5% ISA rate is equivalent to a 5.6% gross rate for a basic rate taxpayer, or 7.5% gross for a higher rate taxpayer.
When does HMRC collect tax on savings interest?
Banks and building societies report your interest to HMRC automatically each year. Unlike the old system where tax was deducted at source, your interest is now paid gross (without any tax deducted). HMRC then calculates whether you owe tax based on your total income and the PSA, and collects it through one of two routes:
- PAYE taxpayers: HMRC adjusts your tax code for the following tax year to collect the underpaid tax gradually through your wages. You will see a reduced tax code (e.g. from 1257L to a lower number), which means less tax-free income each month. The adjustment typically appears from April of the following year.
- Self-Assessment filers: if you already file a tax return (because you are self-employed, have rental income, or earn over £150,000), you declare savings interest on your return and pay any tax due by 31 January.
- Simple Assessment: for people who do not file Self-Assessment and whose tax code cannot easily collect the amount, HMRC may issue a Simple Assessment letter with the tax due.
There is often a delay of 12-18 months between earning the interest and the tax being collected. Interest earned in the 2026/27 tax year will typically be collected through your 2027/28 tax code or on your January 2028 Self-Assessment return. This delay can create a false sense of security — the tax is still owed; it is just collected later.
How does a pay rise affect my savings tax position?
A pay rise that pushes you from basic rate into higher rate does not just increase your income tax — it halves your Personal Savings Allowance from £1,000 to £500. If you were previously earning exactly £1,000 in interest with no tax to pay, crossing the £50,270 threshold means £500 of that interest is now taxable at 40% — an unexpected tax bill of £200.
Similarly, crossing from higher rate to additional rate eliminates the PSA entirely. Someone earning £126,000 with £3,000 in savings interest owes 45% on the entire £3,000 because additional rate taxpayers receive no savings allowance — a bill of £1,350. At that income level, holding cash outside ISAs is extremely tax-inefficient.
If you are close to a threshold, it may be worth checking whether pension contributions could bring you back below the line. A pension contribution reduces your adjusted net income, potentially keeping you in a lower band and preserving the higher PSA. Our pension contributions guide explains this strategy in detail.
What practical steps should I take to minimise tax on savings?
The first and most effective step is to maximise your ISA allowance. Transfer existing taxable savings into Cash ISAs up to the £20,000 annual limit. If you have savings built up over many years, it may take several tax years to fully shelter them, but each year reduces your taxable interest. Flexible ISAs even allow you to withdraw and replace funds within the same tax year without losing allowance.
If you are married or in a civil partnership, consider whether savings are held by the lower-earning partner. If one partner is a basic rate taxpayer (£1,000 PSA) and the other is a higher rate taxpayer (£500 PSA), shifting savings to the lower earner preserves more allowance. Interest on jointly held accounts is split 50/50 by default for tax purposes, but accounts in one name only are taxed entirely on that person.
Premium Bonds offer another route: prizes are tax-free and do not count towards the PSA, though the effective “rate” is lower and not guaranteed. NS&I also offer Direct Savers and other products — check their terms, as some NS&I interest is taxable while Premium Bond prizes are not. For large cash holdings, consider spreading across ISAs, Premium Bonds, and NS&I to keep taxable interest within your PSA.
How do I check my overall tax position including savings?
Use the income tax calculator to determine which tax band you fall into. If you are a basic rate taxpayer with income below £50,270, your PSA is £1,000 — at 5% interest, that means roughly £20,000 of savings can earn interest tax-free outside ISAs. A higher rate taxpayer's £500 PSA covers only about £10,000 at the same rate.
If your total savings interest approaches these limits, you have several options: move cash into ISAs, make pension contributions to reduce your tax band, use Premium Bonds for the excess, or simply accept the tax and budget for it. The worst outcome is being surprised by an unexpected tax code change in April because you were unaware of the PSA limit.
For a broader view of tax-efficient savings and investing, see our Stocks & Shares ISA guide and our guide to reducing your tax bill legally.
Sources
- HMRC — Tax on savings interest. Personal Savings Allowance: £1,000 (basic), £500 (higher), £0 (additional). Accessed July 2026.
- HMRC — Income Tax rates and Personal Allowances. Starting rate for savings: £5,000 at 0%. Personal Allowance £12,579. Accessed July 2026.
- HMRC — Individual Savings Accounts (ISAs). Annual ISA allowance £20,000. Interest within ISAs is tax-free. Accessed July 2026.