Haris
“Why have I received an HMRC savings tax letter?” is a question many UK savers are asking in 2026. HMRC savings tax letters can relate to savings interest, a change to your PAYE tax code or a Simple Assessment showing tax that has not been collected.
The key thing to know is that receiving a letter does not automatically mean you have done anything wrong. HMRC receives interest information from banks and building societies, checks it against your tax record and may contact you when tax appears to be due or your records need checking. HMRC says around 1.8 million Simple Assessment letters will be issued for the 2025/26 tax year, with some specifically linked to savings interest.
This guide explains what different letters mean, how savings interest is taxed, how to check HMRC’s figures, what deadlines apply and how to avoid confusing savings tax notices with separate P800 refund letters.
What are HMRC savings tax letters?
“HMRC savings tax letter” isn’t the official name of one specific document. People use the phrase to describe several types of HMRC correspondence connected with savings interest and Income Tax.
The document you receive could be a PA302 Simple Assessment, a P800 tax calculation, a PAYE tax-code notice or, in some circumstances, a notice requiring Self Assessment. Each one has a different purpose and can lead to a different action.
A PA302 Simple Assessment is used when HMRC has calculated tax that cannot be collected automatically through PAYE. HMRC’s current guidance says a Simple Assessment may apply where tax is due on savings interest, dividends or pension income, or where the tax cannot be collected through a tax code.
A P800 is different. It is an end-of-year PAYE calculation that can show an underpayment, an overpayment or no further tax to pay. A P2 tax-code notice can also reflect an estimate of taxable savings interest and change the amount of tax taken from your pay or pension.
Why is HMRC sending savings tax letters in 2026?
HMRC receives information from financial institutions about reportable interest. Its current guidance for banks and building societies sets out annual reporting requirements for interest paid or credited to account holders.
Savings interest has usually been paid gross since April 2016, when the old requirement for banks and building societies to deduct basic-rate tax from interest was removed. The Personal Savings Allowance was introduced at the same time.
That means HMRC often calculates whether tax is due after receiving information from your bank rather than the bank simply taking tax from each interest payment.
HMRC says around 1.8 million Simple Assessment letters are being issued for the 2025/26 tax year. Working-age customers began receiving letters from 30 June 2026, pensioners from 12 August 2026, and a second batch relating to Bank and Building Society Interest data is due between October and December 2026.
The 1.8 million figure is not the number of savers being billed. HMRC says Simple Assessment also covers tax arising from pensions, dividends, second incomes and other circumstances.
HMRC savings account tax letters: what do they mean?
An HMRC savings account tax letter usually means HMRC’s records show savings interest that may affect your Income Tax position. It can be a request to check information, a tax calculation or a change to the way tax is collected.
The letter should tell you which tax year it covers and what figures HMRC has used. A Simple Assessment should explain the income included, the tax calculated, any tax already paid and the amount still due, together with the relevant payment information.
Don’t assume that every figure is final just because HMRC has printed it. Compare the interest shown with your bank statements, annual interest certificates and records for closed accounts.
Joint accounts also need checking. HMRC says interest from a jointly held account is normally split equally between the account holders for tax purposes.
[Table: Difference between PA302, P800, PAYE tax-code notice and Self Assessment]
| Document | What it usually means | What you should do |
| PA302 Simple Assessment | HMRC says tax is due and cannot be collected automatically | Check the figures, then pay or challenge |
| P800 | PAYE reconciliation shows an overpayment, underpayment or no change | Read the calculation and follow the stated instructions |
| P2 tax-code notice | HMRC has changed your tax code | Check the estimated savings interest and other adjustments |
| Self Assessment calculation or notice | Your tax affairs require Self Assessment | Follow the filing and payment rules stated by HMRC |
How much savings interest can you earn before paying tax?
The amount of tax-free savings interest depends on your wider income and tax position.
For 2026/27, the Personal Savings Allowance is:
| Income Tax position | Personal Savings Allowance |
| Basic-rate taxpayer | £1,000 |
| Higher-rate taxpayer | £500 |
| Additional-rate taxpayer | £0 |
These allowances are confirmed by HMRC for 2026/27. The figures apply across the UK, although Scotland has separate rates and bands for non-savings income, which can affect your overall tax position.
There is also a starting rate for savings. You may receive up to £5,000 of savings interest at 0% when your other income is low enough. HMRC says you don’t qualify for the full starting rate where your other income is £17,570 or more, and the £5,000 band reduces as other income rises above your Personal Allowance.
A useful way to think about the rules is that savings interest can be covered by unused Personal Allowance, the starting rate for savings where applicable, and then the Personal Savings Allowance.
Interest from qualifying ISAs does not use up the Personal Savings Allowance. HMRC also excludes certain tax-free savings products from the calculation.
What savings income counts?
The savings rules cover more than an ordinary bank savings account.
HMRC says the Personal Savings Allowance can apply to interest from bank and building society accounts, savings and credit union accounts, peer-to-peer lending, government or company bonds, certain investment funds, trust funds, PPI compensation interest and some life insurance or annuity income.
Interest paid inside a qualifying ISA is treated differently because it is tax-free and does not use the Personal Savings Allowance.
This is one reason you shouldn’t compare the total interest on all of your accounts without separating taxable and tax-free sources first.
[Table: Savings income examples showing whether it normally counts towards the Personal Savings Allowance]
| Income source | Normally counted? |
| Ordinary bank savings interest | Yes |
| Building society interest | Yes |
| Credit union interest | Yes |
| Qualifying Cash ISA interest | No |
| Some government or company bond interest | Yes |
| Peer-to-peer lending interest | Yes |
How does HMRC know about your savings?
Banks and building societies submit annual interest information to HMRC under the bank and building society interest reporting rules. HMRC can then use that information alongside PAYE, pension and other records when working out your tax position.
This can explain why a letter arrives months after the end of the tax year. The 2025/26 tax year ended on 5 April 2026, while HMRC’s current programme includes letters sent later in 2026 as bank interest data becomes available.
HMRC may also have information from accounts that you closed during the year, because interest already paid still belongs in the relevant tax year.
Fixed-rate savings can create another surprise. If a product credits a lump sum of interest in one tax year, that full amount can affect that year’s taxable savings income even if the money accumulated over a longer period.
Why can HMRC’s savings interest figure be wrong?
HMRC’s calculation can be wrong because the underlying information can be incomplete, duplicated, allocated to the wrong year or attributed incorrectly.
A common example is a joint account. If an account is jointly owned, HMRC generally splits the interest equally. If the ownership position or reported data differs, the figure in a tax calculation may need correcting.
Other checks include:
- Interest from every relevant bank and building society account.
- Accounts that were closed during the tax year.
- A one-off fixed-rate account maturity payment.
- Interest that came from an ISA and should be excluded.
- Whether the tax year on the letter matches your own records.
- Whether the Income Tax band used by HMRC is correct.
Check the calculation before paying, especially when the amount looks much higher or lower than the interest you actually received.
What should you do when an HMRC savings tax letter arrives?
Start by identifying the document rather than immediately paying the amount shown.
Step 1: Check the tax year
Look at the period covered by the calculation. Compare it with your bank records for that same tax year.
Step 2: Add up your taxable interest
Collect statements or annual interest certificates from each bank, building society or other provider. Separate qualifying ISA interest because it does not normally count towards the Personal Savings Allowance.
Step 3: Check your tax position
Work out whether you’re a basic-rate, higher-rate or additional-rate taxpayer for the relevant year. Check whether you may qualify for the starting rate for savings as well.
Step 4: Compare HMRC’s figures
Look at the savings interest, other income, allowances and tax already paid. Keep evidence of any difference you find.
Step 5: Decide whether you need to contact HMRC
If the figures are wrong, HMRC says you should contact it within 60 days of the Simple Assessment tax bill. Tell HMRC which amounts are wrong, what they should be and what records you used to check them.
Step 6: Pay any confirmed tax by the deadline
For a Simple Assessment received before 31 October 2026 for the 2025/26 tax year, HMRC says payment is due by 31 January 2027. A Simple Assessment sent on or after 31 October 2026 for 2025/26 or an earlier year is normally payable within three months of the letter date.
How does HMRC collect tax on savings interest?
The collection method depends on your circumstances and the document you receive.
HMRC may collect a relatively small underpayment through a PAYE tax-code adjustment. A Simple Assessment can instead ask you to make a direct payment, and HMRC’s current guidance allows payment in full or a series of smaller payments as long as the full amount is paid by the deadline.
The current GOV.UK Simple Assessment guidance says you can pay online, by bank transfer or by cheque. A Simple Assessment payment uses the 14-character reference beginning with X shown on the letter.
Don’t use bank details from an unsolicited message or an unrelated website. Access GOV.UK directly and use the payment instructions linked to your own HMRC record.
What if the HMRC calculation is wrong?
You can challenge an incorrect Simple Assessment.
HMRC says you should contact it within 60 days of the tax bill and explain exactly which figures are wrong, what the correct figures should be and which documents you used to check them. HMRC may ask you to provide evidence such as payslips, bank statements or pension information.
If HMRC agrees, it will issue an updated Simple Assessment. If it disagrees, you’ll receive a decision explaining what happens next. HMRC says you then have 30 days from the date of the decision letter to appeal.
Challenging the figures doesn’t automatically remove the original payment deadline. Unless HMRC tells you otherwise, the bill still needs dealing with by the stated date.
Can savings tax trigger Self Assessment?
Sometimes, yes.
HMRC’s guidance indicates that people with more than £10,000 of savings and investment income can fall within Self Assessment requirements, although the exact filing position depends on the wider circumstances. Taxable savings interest can also be part of a Self Assessment return when you’re already required to file one.
A person with savings interest below that amount can still owe tax. In such cases, HMRC may collect the tax through PAYE or Simple Assessment rather than requiring a Self Assessment return.
Receiving a savings-related letter doesn’t, by itself, mean you must file a tax return.
Is an HMRC savings tax letter a scam?
A genuine HMRC letter can be checked against official HMRC records.
HMRC maintains a current online guide for checking whether letters are genuine. The page includes Letter IDMS99P for Simple Assessment and tells taxpayers what to do when a letter isn’t listed. It was updated on 12 August 2026.
The safest approach is to sign in to your Personal Tax Account independently rather than following an unexpected link in a text or email.
Be especially careful when a message says you’ve won a refund and asks for bank details immediately. HMRC’s own guidance provides official routes for checking correspondence and reporting suspicious communications.
HMRC sending tax refund letters to 4 million UK households
The phrase “HMRC sending tax refund letters to 4 million UK households” refers to a different type of HMRC communication from the savings tax letters discussed above.
The 2026 P800 campaign involves around 4 million tax calculation letters being sent to people whose PAYE records show they may have overpaid or underpaid tax. The Chartered Institute of Payroll Professionals says HMRC began sending these P800 letters in July 2026 and that a P800 can affect employees, pension recipients and others whose PAYE position needs reconciling.
A P800 isn’t specifically a savings-interest letter. It can arise from wrong tax codes, job changes, pension changes and other PAYE issues. The calculation may show a refund, an underpayment or no further tax to pay.
So the 4 million figure should not be presented as the number of households receiving savings tax demands. HMRC’s separate Simple Assessment programme is the one that includes savings interest as a reason for a letter, and HMRC says that programme covers around 1.8 million letters for 2025/26.
What is the difference between a savings tax letter and a P800?
The easiest distinction is the tax process behind the letter.
A savings-related Simple Assessment is generally about tax HMRC says remains unpaid and cannot be collected automatically. A P800 is an end-of-year PAYE calculation that checks whether the tax already deducted matches the amount due.
A P800 can show a refund. GOV.UK says an online refund claim can be paid within 5 working days, while a cheque requested from HMRC can take up to 6 weeks. Where the P800 itself says a cheque will be sent automatically, GOV.UK says it should arrive within 14 days of the letter date.
That is why a savings tax letter and a tax refund letter shouldn’t be treated as the same thing.
[Table: Savings-related Simple Assessment versus P800 refund]
| Feature | Savings-related Simple Assessment | P800 |
| Main purpose | Collect tax HMRC says is due | Reconcile PAYE tax |
| Can relate to savings interest? | Yes | It can be part of wider PAYE calculations |
| Can show money owed? | Yes | Yes |
| Can show a refund? | Not the usual purpose | Yes |
| Typical response | Check, pay or challenge | Follow refund or payment instructions |
How can you reduce future savings tax surprises?
The easiest way is to keep track of interest throughout the tax year rather than waiting for HMRC to calculate it.
Check the interest paid by each provider at least once during the tax year and again after 5 April. This becomes more useful when you hold several accounts, because your Personal Savings Allowance applies to your overall qualifying savings interest rather than a separate allowance for each bank.
An ISA can also keep qualifying interest outside the Personal Savings Allowance calculation. HMRC confirms that qualifying ISA interest doesn’t use the allowance.
Keep your annual interest certificates, bank statements and HMRC correspondence together. If a figure ever needs correcting, having the paperwork ready makes the check much easier.
Does a joint savings account change the tax calculation?
Usually, yes, because HMRC normally splits interest from a jointly held account equally between the account holders.
For example, £800 of interest on a jointly owned account would normally be treated as £400 for each person. HMRC says you should contact it if the interest should be split differently.
This matters when one person is a basic-rate taxpayer and the other is a higher-rate taxpayer. A savings-interest calculation based on the wrong share can change the amount of tax due.
What should pensioners know about savings tax letters?
Pensioners can receive Simple Assessment letters when taxable income, including savings interest, cannot be collected fully through PAYE.
HMRC’s pension guidance says Simple Assessment is designed for relatively straightforward tax affairs where tax cannot be collected automatically. Pensioners can receive letters after the end of the tax year, and HMRC says the current 2026 programme for pensioners began on 12 August.
The important check is the whole income picture. State Pension, private pension income and savings interest can interact with your allowances, so don’t assess the savings figure in isolation.
FAQ
Q: Why have I received an HMRC savings tax letter?
You may have received one because HMRC has information showing savings interest or other income that has affected your tax position. It could be a Simple Assessment, P800 or tax-code notice. Check the document type, tax year and figures before paying anything.
Q: How much savings interest can I earn before paying tax?
For 2026/27, the Personal Savings Allowance is £1,000 for basic-rate taxpayers, £500 for higher-rate taxpayers and £0 for additional-rate taxpayers. Some lower-income savers may also qualify for the starting rate for savings of up to £5,000.
Q: Can HMRC send a letter even if I don’t owe savings tax?
Yes. You should check the calculation rather than assume you owe tax. HMRC’s records may need correction, or your available allowances may mean the interest is covered.
Q: What is a PA302 letter from HMRC?
A PA302 is a Simple Assessment tax calculation. HMRC uses it where tax is due but cannot be collected automatically, including some cases involving savings interest. Check the figures and the payment deadline shown on the letter.
Q: How long do I have to challenge an HMRC Simple Assessment?
You normally have 60 days from the date of the tax bill to tell HMRC that the figures are wrong. Explain which amounts are incorrect, give the correct figures and identify the records you used.
Q: When do I have to pay an HMRC savings tax bill?
For a Simple Assessment received before 31 October 2026 covering 2025/26, payment is due by 31 January 2027. From 31 October 2026, the normal deadline is within three months of the letter date, unless the letter says otherwise.
Q: Does savings interest count towards Self Assessment?
It can. HMRC guidance says people with more than £10,000 of savings and investment income may need to register for Self Assessment, while smaller amounts can often be handled through PAYE or Simple Assessment. Your wider tax affairs also matter.
Q: Are ISA savings included in HMRC savings tax calculations?
Qualifying ISA interest normally isn’t included in the Personal Savings Allowance calculation. HMRC says interest from tax-free accounts such as ISAs doesn’t count towards the allowance.
Q: Is the 4 million HMRC refund letter the same as a savings tax letter?
No. The 4 million figure relates to P800 tax calculation letters covering PAYE overpayments and underpayments. Savings-related Simple Assessment letters are part of a separate HMRC process.
