A higher interest payment, perhaps £600 from a fixed-rate account, raises a practical question: will HMRC take a share? It depends on your tax band, other income and where your cash is held.
Your allowances decide whether interest is taxed
Your tax band and total income determine how much bank interest can be taxed at 0%.
Your tax band sets the PSA
The Personal Savings Allowance (PSA) is usually £1,000 for a basic-rate taxpayer, £500 for a higher-rate taxpayer and £0 for an additional-rate taxpayer. Interest is added to other taxable income, so a pay rise, pension or rental income can change the allowance available.
The £5,000 starting rate
The starting rate for savings can tax up to £5,000 of interest at 0% for people with low non-savings income. It reduces by £1 for every £1 of other income above the Personal Allowance, before the PSA is considered.
Interest is pooled across accounts
HM Revenue & Customs (HMRC) considers eligible interest together. £450 from one bank, £400 from a building society and £300 from a fixed-rate bond equals £1,150 of savings interest, not three separate allowances.
A practical rule: add interest from every ordinary bank, building society and fixed-term account for the tax year running from 6 April to 5 April. Then apply your starting rate for savings and PSA. Do not add Cash ISA interest or Premium Bond prizes, because they are already tax-free.
Savings interest is normally taxed in the tax year in which it is paid or credited to you, rather than the years over which it built up. This matters with a fixed-rate account that adds all interest at maturity. For example, a three-year bond paying £1,800 only when it matures may place the full £1,800 in one tax year, potentially using a basic-rate taxpayer’s £1,000 Personal Savings Allowance and leaving £800 taxable.
Check the account terms for the payment date before assuming the interest will be spread evenly across several tax years.
For a joint savings account, interest is usually split equally between the account holders for Income Tax purposes, regardless of which person paid in more money. A couple receiving £1,200 of taxable savings interest from a jointly held account would normally each be treated as receiving £600. A basic-rate taxpayer might therefore have all of their share covered by the Personal Savings Allowance, while a higher-rate taxpayer’s £500 allowance could leave £100 taxable.
Keep statements showing the account names and interest paid, particularly if either holder is close to an allowance threshold.
Choose between taxable cash, ISA and prizes
Ordinary savings accounts, Cash ISAs and Premium Bonds have different tax treatment, certainty and access rules.
Cash ISA interest stays outside the PSA
Cash ISA interest is tax-free and does not use your PSA, whatever the amount earned. An ISA can therefore be useful when taxable interest exceeds £500 or £1,000, although deposits use part of the annual ISA subscription limit.
Premium Bonds pay prizes, not interest
National Savings and Investments (NS&I) Premium Bonds enter each £1 bond into a monthly draw. Prizes are tax-free, but returns are uncertain: you may win nothing, and uninvested prizes do not earn compound interest.
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A simple financial calculator can help you total interest from several accounts before deciding whether an ISA wrapper is worth using. It is most useful when a fixed bond pays at maturity rather than monthly.
- Adds interest from bank and building-society accounts in one place
- Tests the £500 and £1,000 PSA thresholds before the tax year ends
- Compares a guaranteed cash return with a possible Premium Bond prize
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A taxable account with a higher guaranteed rate can beat a lower-rate Cash ISA if all interest remains within your PSA. Consider access terms as well as rates when money may be needed soon.
| Where money sits | Tax treatment | Return promised? | Access and limit |
|---|
| Ordinary savings account | Taxable after available allowances | Yes, at the account's fixed or variable rate | Depends on account; no ISA limit used |
| Cash ISA | Interest tax-free | Yes, at the account's stated rate | Terms vary; uses £20,000 ISA allowance |
| NS&I Premium Bonds | Prizes tax-free | No, prizes are random | Usually accessible; maximum holding £50,000 |
Check HMRC records before moving your savings
Banks usually report interest to HMRC, but savers should still check their own records and tax code.
Banks and building societies normally tell HMRC about interest paid. Correct obvious errors, especially after changing accounts or receiving a large fixed-bond maturity payment in a single tax year.
You may need a Self Assessment return if HMRC asks you to file one, tax is not collected correctly, or your wider affairs already require a return. Do not report Cash ISA interest or Premium Bond prizes as taxable income.
List taxable interest, apply any starting-rate band and then deduct the PSA matching your final tax band. Compare the result with any HMRC coding notice before the tax year ends on 5 April.
This guide is not the main framework if you are not UK tax-resident, pay tax in another jurisdiction, hold business savings, need personal tax advice, or are weighing market investments, dividends or capital gains. Those cases need rules beyond ordinary cash savings.
For many employees and pensioners, HMRC collects tax on taxable savings interest by changing the PAYE tax code after receiving figures from banks and building societies. That adjustment may be based on an estimate, so compare the coding notice with your own interest records, especially after a large payment from a building society account or a maturing fixed-rate account. Contact HMRC if the estimate is plainly wrong.
Self Assessment is generally required only when HMRC asks for a return or when tax cannot be dealt with correctly through PAYE; any tax due through Self Assessment must be reported under the applicable filing deadlines.
Common questions
Do I pay tax on Premium Bond prizes?
No. Eligible Premium Bond prizes are tax-free in the United Kingdom, but you may receive no prize.
Is a Cash ISA better than Premium Bonds?
A Cash ISA usually suits savers wanting a known tax-free rate; Premium Bonds offer uncertain returns.
Do I need to tell HMRC about savings interest?
Usually, banks report it, but check your HMRC record if interest exceeds your allowance or HMRC requests Self Assessment.
Does everyone get £1,000 tax-free interest?
No. The PSA is usually £1,000 for basic-rate taxpayers, £500 for higher-rate taxpayers and £0 for additional-rate taxpayers.
Does ISA interest count towards my PSA?
No. Cash ISA interest is tax-free and does not use your Personal Savings Allowance.
Are dividends taxed like bank interest?
No. Dividends have separate allowances and rates, while capital gains have different rules again.
Choose the savings home that fits your tax band
The best savings home depends on expected interest, access needs and tax band, rather than a single headline rate.
What matters most:- Your PSA is usually £1,000, £500 or £0, based on your Income Tax band.
- Low non-savings income can unlock a starting-rate band of up to £5,000.
- Cash ISA interest is tax-free and guaranteed at the stated account rate, subject to its terms.
- Premium Bond prizes are tax-free but uncertain, with no compound interest on uninvested winnings.
- Check HMRC's view of your taxable interest rather than assuming the bank has completed the tax process.
