If you’ve received an HMRC tax letter about savings interest, it usually means your bank or building society has reported interest payments that appear to exceed your Personal Savings Allowance (PSA) for the 2025/26 tax year. These are often called “nudge letters” and are not immediate demands for payment — they are reminders to check your records, calculate any tax due, and declare it correctly.

Quick summary (updated March 2026):

• The Personal Savings Allowance remains frozen at £1,000 for basic-rate taxpayers, £500 for higher-rate taxpayers, and £0 for additional-rate taxpayers.
• With average easy-access and fixed-rate savings rates still between 4% and 5%, even modest savings pots of £10,000–£25,000 can now generate enough interest to push many people over their allowance.
• HMRC has sent hundreds of thousands of these letters in early 2026 based on automatic data from banks.
• You typically have until 31 January 2027 to include any untaxed interest in your Self Assessment return for the 2025/26 tax year (or let HMRC adjust your tax code if you’re on PAYE).
• Ignoring the letter can lead to interest charges (currently 7.75%) and penalties up to 100% of the tax due.

At Filing Accounts we help hundreds of clients every year respond to these letters, file correct Self Assessment returns, and avoid unnecessary penalties. Contact us today for a free initial review of your situation.

Why Is HMRC Sending These Letters in 2026?

HMRC receives annual interest data directly from banks, building societies and other financial institutions under automatic reporting rules introduced years ago. Their data-matching system then compares the total interest reported against:

• Your Personal Savings Allowance
• Your income tax band (which determines the PSA amount)
• Any existing Self Assessment or PAYE records

When the reported interest looks higher than your allowance — and no corresponding tax has been collected — HMRC sends a letter asking you to check and declare any tax owed.

Common triggers in 2025/26 include:

• Savings interest rates remaining elevated (many easy-access accounts and fixed-rate bonds still paying 4–5%)
• Frozen tax thresholds (Personal Allowance, basic-rate band and PSA all frozen until at least 2028)
• Multiple savings accounts whose interest adds up
• Maturity of fixed-rate bonds paying several years’ interest in one tax year
• Changes in personal circumstances (e.g. moving into the higher-rate band due to a pay rise or bonus)

These letters are part of HMRC’s “nudge” strategy — encouraging voluntary compliance before launching a formal enquiry.

What Exactly Is the Personal Savings Allowance?

The PSA lets most people earn a certain amount of savings interest tax-free each tax year (6 April to 5 April).

Important notes (March 2026 update):

• The PSA applies only to non-ISA savings interest (e.g. easy-access accounts, fixed-rate bonds, notice accounts).
• Interest from ISAs, Premium Bonds prizes, and certain child savings accounts is completely tax-free and does not count towards the PSA.
• If your non-savings income is below the Personal Allowance (£12,570), you may also qualify for the Starting Rate for Savings (up to £5,000 of savings interest at 0% tax), giving a potential total tax-free interest of up to £18,570 for basic-rate taxpayers.

How Much Savings Can Trigger a Letter?

Even relatively modest savings can now generate interest above the PSA.

For basic-rate taxpayers the threshold is higher, but many people are surprised to discover they’ve quietly become higher-rate taxpayers due to pay rises or frozen bands.

Step-by-Step: What to Do When You Receive the Letter

1. Confirm the letter is genuine Check the reference number and sender details against official HMRC guidance. Genuine letters never ask for bank details or immediate payment via unusual methods.
2. Gather your interest information
   
   • Log into online banking or request interest certificates from each provider.
   • Check statements for the full 2025/26 tax year (6 April 2025 – 5 April 2026).
   • Include interest from all non-ISA accounts.
3. Calculate your total interest and tax position
   
   • Add up all taxable interest.
   • Subtract your PSA (£1,000, £500 or £0 depending on your tax band).
   • Apply the correct tax rate to any excess.
4. Decide how to declare the interest
   
   • If you already file Self Assessment: Include the interest on your next return (deadline 31 January 2027 for 2025/26).
   • If you don’t normally file Self Assessment: You may need to register by 5 October 2026 and file a return, or HMRC may simply adjust your PAYE tax code to collect the tax gradually.
5. Pay any tax due Pay by 31 January 2027 to avoid late-payment interest (currently 7.75%).
6. Keep records Retain bank statements and calculations for at least 6 years in case of future enquiry.

If the calculation seems complicated or you’re unsure about your tax band, professional help can save time and prevent mistakes.

Contact Filing Accounts — we’ll review your letter and savings interest figures for free and advise on the best next steps.

What Our Clients Say on Trustpilot

• “Received an HMRC savings interest letter and had no idea where to start. Filing Accounts explained everything clearly and filed my return perfectly. 5 stars!” – Anonymous, February 18, 2026 (5 stars)
• “Quick, professional service. They sorted my nudge letter and saved me from unnecessary stress. Highly recommend.” – Mark T., March 1, 2026 (5 stars)
• “Great communication and very reasonable fees. My savings tax issue was resolved in days.” – Sarah L., January 29, 2026 (5 stars)

With a consistent 4.2/5 rating, we’re trusted to handle these situations efficiently.

How to Avoid Future HMRC Savings Interest Letters

• Move savings into a Cash ISA (up to £20,000 allowance per tax year — completely tax-free).
• Spread fixed-rate bonds so they don’t all mature in the same tax year.
• Monitor total interest quarterly using banking apps.
• If married or in a civil partnership, consider placing savings in the name of the lower-rate taxpayer.
• Keep good records and respond promptly to any HMRC contact.

Frequently Asked Questions

Does interest from ISAs count towards the PSA? No — ISA interest is completely tax-free and does not use up your allowance.

What if I think the letter is wrong? Gather evidence (bank statements, interest certificates) and contact HMRC to explain. You can also appeal any tax assessment.

Will HMRC charge penalties straight away? Usually not if you respond and pay voluntarily. Penalties are more likely if you ignore the letter or provide false information.

I’m on PAYE — do I still need to do anything? HMRC may adjust your tax code automatically, but it’s wise to check the calculation yourself to avoid over- or under-payment.

When is the deadline for the 2025/26 tax year? 31 January 2027 for Self Assessment filing and payment (or earlier if HMRC sets a different date).

Need help responding to your letter or filing your return? Get in touch with Filing Accounts today — we make the process simple and stress-free.

IMPORTANT LINKS FROM HMRC WEBSITE

All are current as of March 2026 (no major changes to PSA or savings tax rules noted in recent sources; rates frozen until at least 2027/28 with minor future adjustments announced).

For the “Understanding HMRC Tax Letters” or “Why Is HMRC Sending These Letters” Section

• Main official page on tax on savings interest (core guidance, including PSA explanation): https://www.gov.uk/apply-tax-free-interest-on-savings Suggested link text: “official HMRC guidance on tax on savings interest”

For the “What Exactly Is the Personal Savings Allowance?” Section (tables and explanations)

• Tax on savings interest: How much tax you pay (detailed PSA rules, tables, and examples): https://www.gov.uk/apply-tax-free-interest-on-savings Suggested link text: “HMRC’s full guidance on the Personal Savings Allowance”
• Income Tax rates and allowances (current rates, including PSA context): https://www.gov.uk/income-tax-rates Suggested link text: “current Income Tax rates and allowances on GOV.UK”

For the “Step-by-Step: What to Do” or “How to Respond” Section (declaration and Self Assessment)

• Tax on savings interest – reporting in Self Assessment: https://www.gov.uk/apply-tax-free-interest-on-savings (scroll to “If you’re self-employed” section) Suggested link text: “how to report savings interest on your Self Assessment return”
• Self Assessment tax returns overview (general filing deadlines and process): https://www.gov.uk/self-assessment-tax-returns Suggested link text: “HMRC Self Assessment guidance”
• Check how much tax you pay on dividends and interest from savings (HMRC online tool for calculations): https://www.gov.uk/guidance/check-how-much-tax-you-pay-on-dividends-and-interest-from-savings Suggested link text: “HMRC’s online checker for tax on savings interest”

For the “Preventing Future Letters” or FAQs Section (ISAs, etc.)

• Same main savings interest page (covers ISAs being tax-free): https://www.gov.uk/apply-tax-free-interest-on-savings Suggested link text: “why ISA interest is tax-free (HMRC guidance)”

Additional Useful Links for Authority/FAQs

• Changes to tax rates for property, savings & dividend income (technical note on any recent/future adjustments, confirming PSA freeze): https://www.gov.uk/government/publications/changes-to-tax-rates-for-property-savings-dividend-income/changes-to-tax-rates-for-property-savings-dividend-income Suggested link text: “latest changes to savings tax rates (November 2025 update)”
• Previous tax years guidance (if letter relates to older years): https://www.gov.uk/apply-tax-free-interest-on-savings/previous-tax-years Suggested link text: “HMRC rules for previous tax years”