Receiving a letter from HMRC can be unsettling, particularly if you are an expatriate uncertain about your UK tax obligations. Understanding what type of communication you have received, and how to respond, is the first step to resolving the matter efficiently.

Types of HMRC Communication

HMRC communicates with taxpayers through several types of letters, each with different implications:

1. Nudge Letters (Compliance Notification Letters)

Nudge letters are issued when HMRC has received third-party data suggesting that a taxpayer may have income or gains that have not been declared. Common triggers include:

Information received under the Common Reporting Standard (CRS) about overseas bank accounts
Data from the Land Registry about UK property sales
Information from employers or pension providers
Discrepancies between PAYE records and Self Assessment returns

A nudge letter is not a formal enquiry. It does not impose a legal obligation to respond, but ignoring it is unwise. HMRC typically offers a "voluntary disclosure" window, inviting you to review and correct your returns before it escalates to a formal investigation.

2. Section 9A Enquiry Notices

A formal enquiry under Section 9A of the Taxes Management Act 1970 is a significant escalation. HMRC must open a Section 9A enquiry within a set window (generally 12 months from the filing date of the return). Once opened, HMRC can request documents, explanations, and information.

You are legally obliged to respond to information notices issued during a Section 9A enquiry.

3. Discovery Assessments

Where HMRC believes there has been careless or deliberate understatement of tax, it can issue a discovery assessment outside the normal enquiry window. The time limit for discovery assessments is:

4 years from the end of the tax year for innocent errors
6 years for careless errors
20 years for deliberate behaviour or fraud

4. Code of Practice 9 (COP9), Serious Fraud

COP9 is reserved for cases where HMRC suspects deliberate tax fraud. It involves a civil investigation with the offer of a Contractual Disclosure Facility (CDF). If you receive a COP9, you should seek specialist legal and tax advice immediately.

How to Respond to a Nudge Letter

If you receive an HMRC nudge letter, the recommended approach is:

Do not ignore it. Even though a nudge letter is not a formal enquiry, failing to respond can prompt HMRC to open one.
Review your tax position. Go back through your tax returns for the years in question and identify any discrepancies with the data HMRC may have received.
Seek professional advice. A specialist tax adviser can review your position, identify any gaps, and advise on whether a voluntary disclosure is appropriate.
Make a voluntary disclosure if warranted. HMRC's Let Property Campaign and Worldwide Disclosure Facility (WDF) allow taxpayers to disclose previously unreported income and gains on favourable terms. Voluntary disclosure generally results in lower penalties than disclosure made under formal enquiry.
Respond to HMRC within the timeframe given. If HMRC has set a response deadline, acknowledge the letter and, if you need more time to investigate, ask for an extension.

Penalty Mitigation

Penalties for unpaid tax depend on the taxpayer's behaviour:

| Behaviour | Penalty Range | |---|---| | Prompted disclosure (careless) | 0-30% of unpaid tax | | Unprompted disclosure (careless) | 0-15% of unpaid tax | | Prompted disclosure (deliberate) | 20-70% of unpaid tax | | Unprompted disclosure (deliberate) | 10-35% of unpaid tax |

The earlier and more cooperative the disclosure, the lower the penalty. Interest on unpaid tax applies from the original due date regardless of disclosure timing.

What Expat UK Tax Can Do

We regularly assist clients who have received HMRC nudge letters or compliance notices. Our approach is to:

Review the client's historic UK tax position in full
Identify and quantify any undeclared income or gains
Advise on the most appropriate disclosure route
Prepare and submit the disclosure to HMRC
Negotiate the penalty position

If you have received an HMRC letter and are unsure how to respond, contact us as early as possible. Early action almost always leads to a better outcome.

From Nudge to Enquiry: How to Respond to HMRC Correctly