Unexpected HMRC Savings Tax Bills? Here is What to Do Next

Wojciech Avatar

Diploma in Professional Accounting
Diploma for Financial Advisers
HMRC Authorised Tax Agent


If you have just received an unexpected letter from HM Revenue & Customs (HMRC) asking for tax on your savings interest, do not panic and do not ignore it. Here is exactly what you need to do right now to sort it out:

  1. Check their maths: Gather your bank and building society statements. Add up exactly how much interest you actually made in the last tax year (April 6th to April 5th).
  2. Check your allowance: Compare your total interest to your Personal Savings Allowance (usually £1,000 or £500, depending on your income). If your interest is lower than your allowance, you should not have a bill.
  3. Find out how they want the money: Read the HMRC letter carefully. Usually, you do not need to send them a cheque. Instead, they will change your tax code so the money comes out of your wages or pension in small amounts over the next year.
  4. Contact HMRC if they are wrong: If your numbers do not match what HMRC says, you must contact them to correct it. You can do this through your online personal tax account or by calling the HMRC helpline.

Why did I get this bill?

For a long time, interest rates in the UK were very low. Most people never came close to earning enough interest to pay tax on it. However, because interest rates have gone up recently, many savers are suddenly crossing the line into taxable territory.

Everyone in the UK has a Personal Savings Allowance (PSA). This is the amount of interest you can earn every year without paying a penny of tax.

  • Basic rate taxpayers: Can earn £1,000 in interest tax-free.
  • Higher rate taxpayers: Can earn £500 in interest tax-free.
  • Additional rate taxpayers: Get a £0 allowance (no tax-free interest).

If the interest you earned across all your normal savings accounts combined is higher than your allowance, you have to pay tax on the extra amount.

How does HMRC know about my savings?

You might be wondering how HMRC found out about your money if you didn’t tell them. At the end of every tax year, banks and building societies automatically send HMRC a report showing exactly how much interest they paid you. HMRC then adds this all up across your different accounts and works out if you owe them anything.

How do I actually pay the tax?

If it turns out the bill is correct, paying it is usually very straightforward:

  • If you have a regular job or pension (PAYE): HMRC will simply change your tax code. This means your employer or pension provider will automatically take a little bit of extra tax out of your pay packet each month until the bill is cleared. You do not have to lift a finger.
  • If you do Self Assessment: If you already fill out a yearly tax return, you will just report your savings interest on that form, and the tax you owe will be added to your final Self Assessment bill.

How can I stop this from happening again?

If you want to avoid getting another savings tax bill next year, there are a few simple ways to protect your money:

  • Move money into an ISA: Any interest you earn inside a Cash ISA is completely tax-free and does not count towards your Personal Savings Allowance. You can put up to £20,000 into ISAs each tax year.
  • Consider Premium Bonds: Any prizes you win from National Savings and Investments (NS&I) Premium Bonds are completely free of UK income tax.
  • Share savings with your partner: If you are married or in a civil partnership, and your partner pays a lower rate of tax (or has spare savings allowance), you could legally move some of your savings into an account in their name.

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