What you hand over
- The letter from HMRC, and any earlier correspondence
- The tax return or period HMRC is asking about
- The records behind the figures
- An honest account of anything you're worried about
What we do
- Read the letter and explain what HMRC is really asking
- Act as your agent and deal with HMRC directly
- Gather and present the information in the right way
- Negotiate on any tax, interest and penalties
- Help you make a voluntary disclosure where one is needed
Types of enquiry
HMRC may check a single point on a return (an aspect enquiry), the whole return (a full enquiry), or your records more generally through a compliance check. It also sends “nudge” letters when it has information, for example from overseas banks or online platforms, suggesting income may be missing.
Time limits
HMRC can usually open an enquiry into a Self Assessment return within 12 months of the date it was filed. For earlier years it can go back further: normally up to four years, six years if an error was careless, and up to twenty years if it was deliberate.
Why it matters to respond early
Penalties depend heavily on whether you tell HMRC about a problem before they find it, and how cooperative you are. Getting advice as soon as the letter arrives usually means a better outcome.
Key dates
- Date on the letter
Usually 30 days to replyCheck the letter: don't let the deadline pass.
- 12 months after filing
Normal enquiry windowFor returns filed on time.
Common questions
Do I have to deal with HMRC myself?
No. Once you authorise us as your agent, HMRC will correspond with us and we'll keep you informed.
I've got income I should have declared. What should I do?
Talk to us in confidence. Making a voluntary disclosure before HMRC contacts you normally means much lower penalties than waiting.
Tax information on this page reflects the rules as at November 2026. Rates, thresholds and dates change, so please talk to us before acting on it.