Should I Sign HMRC’s Certificate of Tax Position? What to Do First

HMRC letters about income or assets abroad often include a form called a certificate of tax position. It asks you to confirm your overseas tax affairs are correct.

It looks simple. But signing it without checking can cause problems later. Here is what to do first.

What is a certificate of tax position?

It is a short declaration HMRC sends with some offshore letters. By signing, you confirm one of the following:

• You have no overseas income or gains that need declaring, or
• All overseas income and gains have already been declared, or
• You have already disclosed anything that was missing.

HMRC usually sends these letters because it has received information from an overseas bank or tax authority.

Do I have to sign it?

No. You are not legally required to sign the certificate.

But you should not ignore the letter either. HMRC expects a response. If you do nothing, it may open a formal enquiry, and any later disclosure is more likely to be treated as prompted, which means higher penalties.

When it may be right to sign

Signing may be appropriate if, after a proper check, all of these apply:

• You were not UK resident in the years concerned, or
• All overseas income and gains were included on your tax returns, or
• The income is not taxable in the UK, for example a genuine gift
• You have the records to prove it

Even then, it is often better to send a short covering letter explaining your position, with supporting evidence.

When you should not sign

Do not sign the certificate if:

• Any overseas interest, rent, dividends or pension was left off a return
• You sold property, shares or crypto abroad and did not report a gain
• You are unsure whether something was taxable
• The account belongs to you jointly and you have not checked your share

In these cases, the right response is usually a disclosure through the Worldwide Disclosure Facility.

The risks of signing incorrectly

A signed certificate is a formal statement to HMRC. If it later proves wrong:

• HMRC may treat the error as deliberate rather than careless
• Deliberate behaviour means much higher penalties and a 20-year look-back
• In serious cases, a false statement can be relevant to a criminal investigation

How to respond, step by step

1. Read the letter carefully and note the response date.
2. List every overseas account, property and investment, including joint ones.
3. Compare with your tax returns for each year.
4. Decide the route: a reply, a certificate, or a disclosure.
5. Respond before the date on the letter, or ask HMRC for more time.

Our guide to the HMRC letter about income or assets abroad explains each option in more detail.

What if I have already signed it?

If you signed a certificate and later realise something was missed, act quickly.

• Make a full disclosure as soon as possible.
• Explain honestly why the certificate was wrong.
• Provide evidence that the original error was not deliberate, where that is true.

Putting it right promptly is still far better than waiting for HMRC to find it.

What HMRC may already know

It helps to understand why the letter arrived. HMRC receives information from more than 100 countries under the Common Reporting Standard, including:

• Your name, address and date of birth
• The account number and financial institution
• The year-end balance
• Interest, dividends and sale proceeds paid into the account

So HMRC often has a good idea of what exists before it writes. That is why a careful, accurate reply matters more than a quick one.

Common reasons no extra tax is due

• The income was already on your tax return under another heading
• Tax paid abroad, through foreign tax credit relief, covers the UK liability
• The interest fell within your personal savings allowance and nothing else was due
• You were not UK resident in the years concerned

If any of these apply, we help you evidence them so HMRC can close its file.