If you are wondering, do I have to notify HMRC of savings interest, the answer depends on whether the interest creates a tax bill and how you normally pay tax.
Banks and building societies usually report your interest to HMRC automatically, but that does not always remove your responsibility to tell HMRC when tax is due.
For 2026/27, a basic-rate taxpayer can usually receive up to £1,000 of savings interest through the Personal Savings Allowance, while a higher-rate taxpayer normally gets £500.
Additional-rate taxpayers receive no Personal Savings Allowance. People with relatively low non-savings income may also qualify for the starting rate for savings of up to £5,000.
How Much Savings Interest Can You Earn Tax Free?
Three different tax-free amounts can apply to savings income.
| Allowance or Rate | 2026/27 Position |
|---|---|
| Personal Allowance | £12,570 if available |
| Starting Rate for Savings | Up to £5,000 |
| Personal Savings Allowance – Basic Rate | £1,000 |
| Personal Savings Allowance – Higher Rate | £500 |
| Personal Savings Allowance – Additional Rate | £0 |
The starting rate for savings is mainly relevant where your other income is low. If your non-savings and non-dividend income is £17,570 or more, you do not receive it.
Where that income is between £12,570 and £17,570, every £1 above the Personal Allowance reduces the £5,000 starting-rate band by £1.
Your Personal Savings Allowance is separate. Savings interest itself can also affect which Income Tax band you fall into, so the correct allowance depends on your overall income.
How Does HMRC Know How Much Savings Interest You Earn?
UK banks and building societies send interest information to HMRC after the tax year ends. Under HMRC’s bank and building society interest reporting rules, the normal annual reporting cycle requires institutions to submit their returns by 30 June unless HMRC states another deadline.
HMRC can then use those figures to:
- Adjust your PAYE tax code
- Produce a P800 tax calculation
- Issue a Simple Assessment
- Compare reported interest with your Self Assessment figures
For PAYE taxpayers, HMRC may estimate current-year savings interest using information from the previous year. That means the amount in your tax code may not always match what you eventually receive.
The 5 October Deadline and the 31 March Rule Are Different
These two dates are often confused.
5 October is the normal deadline for notifying HMRC that you are chargeable to tax when you have not already received a notice requiring you to file a tax return.
31 March has a different purpose. GOV.UK says that if you have gone over your savings allowance and have not received a tax calculation letter by 31 March following the relevant tax year, you should contact HMRC as soon as possible.
So, if you already know untaxed savings interest has created a tax liability, relying only on the later 31 March date is not the safest approach.
Do You Need Self Assessment for Savings Interest?
If you already file a Self Assessment return, report your savings interest there.
HMRC’s current Self Assessment criteria also cover people receiving £10,000 or more in savings and investment income before tax. Below that level, HMRC can often collect tax through PAYE or Simple Assessment, although you may still need to notify HMRC that taxable income has arisen.
Keep annual interest statements or certificates from every bank and building society. They can be particularly useful if HMRC’s figures differ from your own records.
Fixed-Term Bonds and Interest You Cannot Access Yet
Fixed-term savings accounts are one of the most misunderstood parts of savings taxation.
Interest is generally taxable when it is received or made available to you. If a bond credits interest annually and you can withdraw the money early by paying a penalty, HMRC normally treats the interest as arising each year when it is credited.
A withdrawal penalty does not automatically make the money inaccessible for tax purposes.
The position changes where the account terms genuinely prevent you from accessing the capital and interest until maturity. In that situation, the interest may arise for tax purposes only when it finally becomes accessible.
For example:
- A three-year bond credits £1,500 interest each year
- Early withdrawal is permitted after paying a penalty
- The £1,500 normally becomes taxable each year when credited
If the bond contract instead allows no access at all until the three-year term ends, the accumulated interest can fall into the tax year in which the bond matures.
That distinction matters because several years of interest becoming taxable at once could use up your Personal Savings Allowance and leave a larger amount subject to Income Tax.
Check HMRC’s Savings Interest Figures Before Paying
Do not assume that every figure in an HMRC calculation must automatically be correct.
Differences can arise because of:
- Interest estimates carried forward from a previous year
- Joint accounts being divided incorrectly
- Duplicate or amended bank submissions
- Fixed-term interest being reported differently from when it becomes taxable
- Accounts being opened, closed or moved during the year
Compare HMRC’s figure with your bank statements and annual interest certificates.
If a Simple Assessment is wrong, you normally have 60 days from the date of the bill to query the figures. HMRC may ask you to provide bank statements, interest certificates or other evidence supporting the amount you believe is correct.
Interest from joint accounts is normally divided equally between the account holders for HMRC purposes. If the actual ownership position is different, you should contact HMRC rather than simply accepting an incorrect calculation.
Are Bank Rewards and Cashback Taxed Like Savings Interest?
Not always. The tax position depends on what the bank is actually paying you.
A reward calculated as interest on your account balance is normally savings income and can potentially qualify for the Personal Savings Allowance.
A regular fixed cash reward that is not connected to the account balance may instead be treated as an annual payment or another form of taxable income.
The Personal Savings Allowance would not necessarily cover it, and tax may already have been deducted before you receive the reward.
By contrast, many switching incentives and spending-related cashback payments are generally treated as rebates or discounts rather than savings interest.
Always check how the particular account reward is structured rather than assuming every payment from a bank counts as interest.
Worked Example: How the Savings Allowances Can Combine
Suppose you earn £16,000 from employment and receive £3,000 of taxable savings interest during 2026/27.
Your £12,570 Personal Allowance is used against employment income first, leaving £3,430 of earnings above the allowance.
The maximum £5,000 starting rate for savings is reduced by that £3,430, leaving £1,570 of savings income falling within the 0% starting-rate band.
You remain a basic-rate taxpayer, so you also have a £1,000 Personal Savings Allowance.
Together, the starting-rate band and Personal Savings Allowance cover £2,570 of your £3,000 interest.
That leaves:
£3,000 − £2,570 = £430 taxable savings interest
At the 2026/27 basic savings rate of 20%, the tax would be:
£430 × 20% = £86
This is why simply asking whether your interest exceeds £1,000 can produce the wrong answer. Your Personal Allowance and starting rate for savings may also affect what you owe.
What Changes From April 2027?
The government has confirmed significant changes from 6 April 2027.
| Rule | 2026/27 | 2027/28 |
|---|---|---|
| Savings Basic Rate | 20% | 22% |
| Savings Higher Rate | 40% | 42% |
| Savings Additional Rate | 45% | 47% |
| Starting Rate for Savings | Up to £5,000 | Up to £5,000 |
| Basic-Rate PSA | £1,000 | £1,000 |
| Higher-Rate PSA | £500 | £500 |
| Cash ISA Limit for Under-65s | Up to £20,000 within overall ISA limit | £12,000 within £20,000 overall limit |
| Cash ISA Limit for Age 65+ | Up to £20,000 | £20,000 |
The official April 2027 savings tax changes confirm that savings Income Tax rates will rise by two percentage points across all three bands while the Personal Savings Allowance and starting rate for savings remain unchanged.
Income Tax ordering rules will also change. From April 2027, general allowances and reliefs will normally be applied against income that is not property, savings or dividend income before being used against those asset-income categories.
The overall annual ISA limit remains £20,000, but people under 65 will face a new £12,000 annual Cash ISA subscription limit. People aged 65 and over will retain the ability to subscribe up to £20,000 to Cash ISAs.
The £12,000 restriction is therefore a new Cash ISA subscription cap. It does not mean existing qualifying ISA savings suddenly become taxable.
Do Scottish and Welsh Taxpayers Pay Different Rates on Savings Interest?
No. Savings-income rates apply across the UK.
Although Scottish taxpayers can face different Income Tax rates on employment, pension and certain other non-savings income, savings interest continues to use the UK-wide savings rates.
The savings tax changes taking effect from April 2027 will also apply across the UK.
The same principle applies to Welsh taxpayers for savings income.
Are Premium Bond Prizes Savings Interest?
No. Premium Bonds do not pay conventional savings interest.
Instead, NS&I uses the money allocated to the prize fund for monthly prize draws, and Premium Bond prizes are tax free. They therefore do not use your Personal Savings Allowance and should not be reported as taxable savings interest.
Interest from other taxable NS&I products can be treated differently, so check the rules applying to the individual account or bond.
What Should You Do if You Think You Owe Tax?
If your savings interest exceeds your available tax-free amounts, take action rather than waiting indefinitely for HMRC to identify the liability.
- Add Up Gross Interest From All Taxable Savings Accounts
- Exclude Tax-Free ISA Interest And Premium Bond Prizes
- Check Your Personal Allowance, Starting Rate And Personal Savings Allowance
- Review Fixed-Term Bond Conditions To Establish When Interest Became Accessible
- Tell HMRC By The Relevant Deadline If Untaxed Interest Creates A Liability
- Include Savings Interest On Self Assessment If You Already File A Return
- Compare HMRC Figures With Your Own Records And Challenge Errors Promptly
Conclusion
So, do I have to notify HMRC of savings interest? Not every saver needs to contact HMRC because banks normally report interest automatically and many people remain within their tax-free savings allowances.
However, if untaxed savings interest creates an Income Tax liability, you should make sure HMRC is informed rather than assuming your bank’s report completely removes your own responsibilities.
For 2026/27, the Personal Savings Allowance remains £1,000 for basic-rate taxpayers and £500 for higher-rate taxpayers, with no allowance for additional-rate taxpayers.
People with lower levels of other income may also benefit from up to £5,000 through the starting rate for savings.
The most important practical points are to understand the 5 October notification deadline, check when fixed-term bond interest genuinely becomes accessible, verify HMRC’s figures against your records and prepare for the higher savings Income Tax rates beginning in April 2027.
FAQs
Do Banks Automatically Tell HMRC About Savings Interest?
Yes. UK banks and building societies normally provide HMRC with savings-interest information after the tax year ends. You should still check whether the interest creates a tax liability.
Do I Need to Declare Savings Interest Below £1,000?
Not necessarily. Basic-rate taxpayers can potentially receive a £1,000 Personal Savings Allowance, but your overall income determines your tax band and the allowances available.
What Happens if I Forget to Tell HMRC About Savings Interest?
If tax was due and you were required to notify HMRC, late notification could lead to additional tax, interest and potentially penalties. Contact HMRC once you identify the problem.
Is Cash ISA Interest Taxable?
No. Qualifying Cash ISA interest remains tax free. From April 2027, the amount under-65s can newly subscribe to Cash ISAs falls to £12,000 a year within the £20,000 overall ISA allowance.
Is Interest on a Fixed Bond Taxed Every Year?
It depends on accessibility. If you can access the funds early, even after paying a penalty, interest is normally taxable when credited. If the account genuinely prohibits access until maturity, the interest may become taxable when it becomes accessible.
