HMRC savings tax letters: why thousands of UK savers are getting unexpected bills in 2026
LONDON · By Teja Pagidimarri · Published May 23, 2026 · 4 min read
HMRC has begun a wave of tax-code adjustments aimed at savers whose interest crossed the Personal Savings Allowance (PSA) in the 2024-25 tax year. With easy-access rates above 4 per cent for most of that year, GBP 25,000 in a non-ISA account easily topped the GBP 1,000 basic-rate PSA, and the tax is now collected through PAYE.
- Personal Savings Allowance
- GBP 1,000 for basic-rate taxpayers, GBP 500 for higher-rate, nil for additional-rate.
- How HMRC finds out
- Banks and building societies report interest paid annually to HMRC under the Bank and Building Society Interest (BBSI) return.
- Method of collection
- Tax-code reduction via PAYE for employed / pensioner taxpayers; Self Assessment for SA filers.
- ISA interest
- Tax-free, does NOT count toward the PSA.
Why so many savers are caught in 2026
The PSA was set in 2016 and has never been uprated. At the 0.1 per cent base rate that ran for most of 2016 to 2021, savers needed a six-figure balance to top it. From 2023, easy-access rates above 4 per cent meant a balance of around GBP 22,000 could breach the GBP 1,000 threshold.
Many of those caught have no Self Assessment registration and assumed the tax was deducted at source. It has not been since 2016, when banks stopped withholding it, so it now surfaces as a tax-code change.
How savings interest is actually taxed
Savings interest is not a separate tax. It sits on top of your other taxable income, and the rate depends on which band it lands in once stacked. A basic-rate taxpayer pays 20 per cent above the PSA; cross GBP 50,270 and the slice above is taxed at 40 per cent, with the PSA itself dropping from GBP 1,000 to GBP 500.
Two allowances can wipe the bill out first. The Personal Allowance (GBP 12,570 for most people) covers your first slice of income. The starting rate for savings then gives up to GBP 5,000 of interest at 0 per cent, but only for low non-savings income: every GBP 1 of wages or pension above the Personal Allowance cuts that band by GBP 1, so it is gone by GBP 17,570. The UK take-home salary calculator shows where GBP 50,270 sits for your income.
How to check the calculation
HMRC does not wait for you to declare interest; providers report it and most people get a P800 or a Simple Assessment. Working through it in order keeps it simple:
- Download the interest certificate from each provider for the tax year named in the letter (6 April to 5 April).
- Add the gross interest across every non-ISA account, including interest-paying current accounts. Leave out ISAs, Premium Bond prizes, and NS&I tax-free products.
- Halve any joint-account interest, because each holder is taxed only on their share.
- Subtract the PSA for your band: GBP 1,000 basic-rate, GBP 500 higher-rate, nil additional-rate.
- Apply your marginal rate (20, 40 or 45 per cent) to what is left. That is the tax HMRC is collecting.
If your total matches the letter, the change is correct and the tax is spread across the year through PAYE. If not, correct the figures in your Personal Tax Account; a mismatch usually traces to a missed certificate or a joint account counted in full.
Common mistakes and how to avoid them
A few errors account for most disputed calculations: counting ISA interest (which never uses the PSA), forgetting interest-paying current accounts, or treating a joint account as wholly yours.
Timing traps catch people out too. Fixed-rate bonds that pay all their interest at maturity can land a large lump in one tax year and tip a basic-rate saver over GBP 50,270, halving the PSA; a bonus or redundancy payment does the same. Spreading savings between spouses and sheltering balances inside an ISA are the standard fixes. The compound interest calculator projects how much a balance throws off before you breach the PSA, and the UK money and tax hub collects the related guides.
Frequently asked questions
Does interest from cash ISAs count?
No. Cash ISA and stocks and shares ISA interest and dividends are tax-free and never use up the PSA.
What is the starting rate for savings?
A separate 0 per cent band of up to GBP 5,000 of interest, on top of the PSA, for people with low non-savings income. Every GBP 1 of wages or pension above the Personal Allowance reduces it by GBP 1, so it disappears once non-savings income reaches GBP 17,570. It is why a pensioner can receive several thousand pounds of interest tax-free while a full-time employee with the same balance cannot.
How does HMRC know how much interest I earned?
Banks and building societies report the gross interest they paid you after the tax year ends, under the Bank and Building Society Interest return. HMRC matches it to your record and works out any tax automatically, usually via a P800 calculation or a Simple Assessment. You do not have to declare it separately unless you are already in Self Assessment.
How can I stop breaching the PSA next year?
Move savings into a cash ISA so the interest is tax-free and never touches the PSA, or split balances between spouses to use two allowances. Watch fixed-rate bonds that pay all their interest at maturity, since a single large payment can tip you into the higher-rate band and halve the PSA for that year.
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Teja founded 3tej in 2024 to make multi-country tax and salary math less painful. He builds and maintains the calculators, writes the editorial guides on policy changes, and signs off every rate update before publish.