Do I Have to Notify HMRC of Savings Interest? UK Tax Guide

Interest rates on UK savings accounts have climbed sharply — at 4.31% in October 2024, even modest savings can now generate enough interest to breach the tax-free Personal Savings Allowance. The good news: for most UK savers, HMRC already knows about your interest through automatic bank reporting, so you may not need to lift a finger.

Basic rate taxpayers PSA: £1,000 · Higher rate taxpayers PSA: £500 · Additional rate taxpayers PSA: £0 · Banks report interest to HMRC: Annually · Declaration deadline if no return: 5 October following tax year

Do banks automatically tell HMRC about interest?

Yes — UK banks and building societies are legally required to report all savings interest paid to HMRC at the end of each tax year. This reporting obligation has been in place since April 2016, when the rules shifted from taxed-at-source interest to gross interest payments, placing the responsibility for paying any tax owed directly on the taxpayer.

Bank reporting requirements

Financial institutions must submit details of interest paid to customers via the International Savings Association (ISA) and reporting mechanisms. The data HMRC receives includes your name, National Insurance number, and the total interest paid during the tax year.

What HMRC receives from providers

GOV.UK guidance confirms that banks report interest to HMRC, and HMRC then reviews whether any tax is due. If tax is owed, HMRC will contact the taxpayer — either through a tax code adjustment for employees or a formal notice for those in Self Assessment.

Do I need to report savings to HMRC?

In most cases, no — HMRC already has the data from your bank, so you typically don’t need to report savings interest. The exception is when your interest exceeds your Personal Savings Allowance and you fall into a situation requiring Self Assessment registration.

When reporting is required

You must register for Self Assessment if your savings interest income exceeds £10,000 per year, regardless of whether it falls within your PSA. Self-employed individuals must declare all savings interest on their Self Assessment return, even amounts within the PSA threshold.

PSA thresholds by tax band

Your tax band determines your PSA: basic-rate taxpayers get £1,000 tax-free interest, higher-rate taxpayers receive £500, and additional-rate taxpayers receive nothing — meaning all interest above £0 is taxable.

What happens if I don’t declare my savings?

Failing to declare taxable savings interest can result in penalties and interest charges from HMRC. The exact penalty depends on the circumstances, but HMRC has powers to charge up to 100% of the tax due in serious cases of careless or deliberate non-compliance.

Penalties for non-declaration

According to HMRC guidance and professional tax bodies, penalties can include interest charges on unpaid tax, fixed penalties based on the amount owed, and potentially higher penalties for deliberate concealment. HMRC typically sends “nudge letters” first when bank-reported data suggests tax is due exceeding the PSA.

HMRC discovery process

HMRC uses the annual interest data from banks to identify discrepancies. If you receive no letter but believe tax is owed, or if your bank accounts cannot be matched to your records, you should proactively contact HMRC before the 5 October deadline following the tax year.

What are the tax rules on savings interest?

Since April 2016, banks and building societies pay interest gross — without deducting tax at source. This shift means UK savers receive their interest in full, and HMRC collects any tax owed through PAYE, Self Assessment, or Simple Assessment, depending on the taxpayer’s circumstances.

Personal Savings Allowance details

The PSA covers interest from bank accounts, building societies, credit unions, corporate bonds, government bonds, gilts, peer-to-peer lending, and certain investment trusts. Notably, dividend income falls outside the PSA entirely — a separate dividend allowance applies. Sharia accounts’ expected profit payments are also included in PSA calculations.

Tax rates applied

Once your interest exceeds your PSA, the excess is taxed at your marginal income tax rate. For basic-rate taxpayers, that’s 20%; higher-rate taxpayers pay 40%; and additional-rate taxpayers pay 45% on all interest above the £0 allowance.

How does HMRC know if you have savings?

HMRC’s knowledge of your savings comes entirely from financial institutions — banks, building societies, and other providers submit interest data to HMRC annually. This automated reporting system means HMRC has a comprehensive picture of UK savings without requiring individual notifications from taxpayers.

Data from financial institutions

Every UK bank account that pays interest is reported to HMRC with the account holder’s details. HMRC cross-references this data with taxpayer records using National Insurance numbers. For roughly one in five accounts that cannot be matched, HMRC relies on the individual to come forward.

Checking your tax calculation

You can review your Personal Tax Account on GOV.UK to see what interest HMRC has on record. If the figures look incorrect or incomplete, contact HMRC directly. For employees, HMRC may adjust your tax code based on prior-year interest data to collect any tax owed through PAYE.

How to report savings interest to HMRC

For most UK savers, no reporting is needed — HMRC receives automatic data from banks. However, certain situations require direct action. Here’s what to do depending on your circumstances.

Step 1: Check your PSA threshold

Determine which tax band you fall into and calculate your PSA. Basic-rate taxpayers have £1,000 tax-free; higher-rate have £500; additional-rate have £0. If your total interest across all accounts is below this threshold and you receive a salary through PAYE, HMRC typically handles any tax adjustment automatically.

Step 2: Review your Personal Tax Account

Log into your Personal Tax Account on GOV.UK to verify what interest data HMRC has on record. If the information is accurate and matches your records, no further action is typically required unless your interest exceeds £10,000.

Step 3: Register for Self Assessment if needed

If your savings interest exceeds £10,000, or if you are self-employed, you must register for Self Assessment. Complete the relevant pages declaring all savings interest, including amounts within your PSA. The registration deadline is 5 October following the tax year.

Step 4: Contact HMRC if unmatched

If you haven’t received any correspondence from HMRC by 31 March following the tax year, and you believe tax may be due on your savings interest, contact HMRC directly to ensure your records are properly matched.

To decide your tax code, HMRC will estimate how much interest you’ll get based on previous years.

— GOV.UK guidance

Strictly speaking, if an individual has interest which needs to be taxed they are required to register with HMRC within six months of the end of the tax year — unless HMRC sends them a tax computation.

— Senga Prior, President, Association of Taxation Technicians

Higher-rate and additional-rate taxpayers face zero PSA and should actively monitor their interest to avoid unexpected tax bills. Those with very large savings pots should ensure Self Assessment registration is in place before the October deadline. UK savers whose interest falls within their Personal Savings Allowance have no reason to notify HMRC — the system runs on bank data, but those exceeding thresholds must act promptly to avoid penalties.

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Most UK savers need not notify HMRC directly of savings interest, as banks report automatically according to rules in this detailed UK tax rules guide.

Frequently asked questions