Nudge Letters From HMRC
Don’t ignore it — but don’t respond without understanding it first
If you’ve received a letter from HMRC asking you to check your tax affairs (often called a “nudge letter”), it usually means they already hold information suggesting something may be missing or incorrect.
This is a critical stage — and how you respond now can directly affect penalties, risk of investigation, and overall outcome.
What Is an HMRC Nudge Letter?
A nudge letter is not a formal investigation — but it is a warning. HMRC sends these when systems detect discrepancies using third-party data.
HMRC’s Connect system uses data from Companies House, Land Registry, social media, and global tax systems to identify issues. If you received a letter, HMRC already suspects something.
Common Reasons HMRC Sends Nudge Letters
Undeclared income from renting out a property (including Airbnb or short-term lets)
Capital gains or income from cryptocurrency assets
Offshore bank accounts or investments reported to HMRC under international data-sharing agreements
Dividends or income from a closely held company that do not match HMRC's records
Undeclared income from online trading or self-employment
High Income Child Benefit Charge that has not been accounted for
Construction Industry Scheme (CIS) discrepancies
Share sales or other capital gains transactions
What Should You Do?
If your tax affairs are fully up to date
You should still respond to HMRC to confirm this. Staying silent may prompt HMRC to escalate to a formal compliance check. We can review your position and draft an appropriate response on your behalf.
If there is an error or omission
You should take steps to correct your tax position as soon as possible. Doing so voluntarily — before HMRC opens a formal enquiry — will result in significantly lower penalties. We can help you identify the right disclosure route and manage the process from start to finish.
Important note: Some nudge letters include a 'Certificate of Tax Position' asking you to sign and confirm your affairs are correct. Our advice is generally not to sign this certificate without first taking professional advice, as it can have serious consequences if later found to be inaccurate. This is consistent with guidance from the Chartered Institute of Taxation (CIOT).
How We Help
We review your nudge letter and explain what it means in plain English
We assess your tax position across the relevant years
We advise on whether a disclosure is needed and which route to use
•We draft and send a professional response to HMRC on your behalf
If a disclosure is required, we manage the entire process for you
We negotiate with HMRC to minimise penalties where possible
Why Act Quickly?
Once HMRC opens a formal compliance check, your disclosure is no longer considered voluntary. This means higher penalties, less flexibility, and a more adversarial process. Acting promptly after receiving a nudge letter is almost always the most cost-effective approach.
Free Initial Consultation
If you have received a nudge letter and are unsure what to do, contact our Cardiff office today. We offer a free, no-obligation initial consultation to help you understand your position and your options.
Speak Before Responding
If you’ve received a nudge letter, the best step is to get clarity before replying.
