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Private Families

HMRC enquiry and investigation help for individuals and families

Calm, expert help when HMRC checks your personal tax: enquiries into returns, nudge letters, offshore and crypto issues, inheritance tax questions and voluntary disclosures.

Led by
Omar Aswat CTA
Last reviewed
9 October 2026
Reading time
5 min
Private Families
9 of 9
On this page9 sections
  1. Who this is for
  2. The kinds of HMRC contact
  3. How far back can HMRC go
  4. Penalties and disclosure
  5. Common mistakes
  6. How we help
  7. Why ASWATAX
  8. Talk to us
  9. Questions answered

Key points

  1. 1We represent you directly with HMRC, so you do not have to handle the correspondence
  2. 2Penalties depend on behaviour and cooperation, so early and honest handling matters
  3. 3Voluntary disclosure usually leads to lower penalties than waiting to be found
  4. 4Offshore matters can be assessed up to 12 years back, and deliberate behaviour up to 20
  5. 5Do not ignore a letter, and do not reply before you understand what it really asks

Getting a letter from HMRC about your personal tax can feel alarming, even when you have done nothing wrong. Many checks end with no change or a small adjustment. Others are serious, particularly where offshore income, crypto, gifts or residence are involved.

This page covers HMRC checks for individuals and families. It also covers the work that used to sit under "HMRC Representation": acting for you with HMRC so you do not have to. If you own a business or property portfolio, see the equivalent pages for Business Owners and Property Professionals.

Who this is for

  • Individuals who have received an enquiry, a check or a nudge letter
  • People with overseas income, assets or accounts who think something is missing
  • Crypto holders whose returns are incomplete (see our Cryptocurrency page)
  • Executors and families facing questions on inheritance tax or gifts
  • People whose residence is being questioned
  • Anyone who has found an error and wants to put it right voluntarily

The kinds of HMRC contact

Enquiries into a return. HMRC can open an enquiry into a Self Assessment return within 12 months of the day it was filed on time. It may ask about one item (an "aspect" enquiry) or the whole return. It ends with a closure notice, which can be appealed.

Nudge letters. Letters based on HMRC data inviting you to check and correct your position. They are not formal enquiries.

Discovery assessments. HMRC can assess extra tax outside the enquiry window if it discovers a loss of tax, within the time limits below.

Inheritance tax and gift queries. Questions on valuations, reliefs and lifetime gifts after a death or a chargeable transfer.

Civil fraud investigations. Where HMRC suspects deliberate evasion, it may issue Code of Practice 9 (COP9), which offers the Contractual Disclosure Facility.

How far back can HMRC go

BehaviourTime limit
No careless or deliberate error4 years from the end of the tax year
Careless6 years
Deliberate20 years
Offshore matters (income tax, CGT, IHT), from 2015/1612 years, even without carelessness

Penalties and disclosure

For an inaccuracy, the maximum penalty is 30% of the extra tax if careless, 70% if deliberate but not concealed, and 100% if deliberate and concealed. The rate you actually pay depends on whether the disclosure was prompted or unprompted, and on how much you tell HMRC, how quickly, and how fully you cooperate. Offshore matters carry higher ranges.

Disclosure routes compared

RouteWhen it fitsKey points
Amending a return or writing to HMRCSimple, recent, UK-only errorQuick; same penalty principles apply
Worldwide Disclosure FacilityOffshore income, assets or activityNotify online, then 90 days to disclose (up to 180 for complex cases); pay in full on disclosure
Contractual Disclosure Facility (COP9)HMRC suspects deliberate behaviour60 days to accept; full and complete disclosure required; immunity from prosecution for disclosed conduct
Crypto disclosureUnreported crypto gains or incomeHMRC provides a route for unpaid crypto tax

Inheritance tax, gifts and offshore assets

Enquiries for families often involve more than one tax. After a death, HMRC can query valuations, reliefs claimed and lifetime gifts made in the seven years before death, and the same time limits apply as for other taxes. Offshore assets add another layer: HMRC receives information from overseas authorities and compares it with what was reported. Because inheritance tax is now residence-based, questions about where someone lived, and for how long, can decide whether overseas assets are in charge at all. Our Inheritance Tax Planning page sets out the underlying rules.

Your first week after a letter

  1. Note the deadline and the tax year, and make a copy of everything.
  2. Do not call HMRC or send documents before you know what is being asked.
  3. Gather the return, supporting records and bank statements for the years named.
  4. Do not alter or delete anything.
  5. Send us the letter. We will tell you what it is, what the risk looks like and what to do next, and we can write to HMRC to confirm we act for you.

Common mistakes

  • Replying in a hurry, with partial or inaccurate information
  • Ignoring a nudge letter because it "is not an enquiry"
  • Assuming that tax paid abroad means nothing is owed here
  • Disclosing some years but not others
  • Destroying records or failing to preserve them
  • Offering to pay without understanding the interest and penalties

How we help

  1. Review the letter and the facts. We explain what HMRC is asking and the possible exposure.
  2. Take over the correspondence. You authorise us as your agent. We reply, challenge excessive requests and meet deadlines.
  3. Rebuild the position. We check returns, records and calculations, including residence and gains.
  4. Manage the outcome. We negotiate penalties, make disclosures and, if needed, appeal.
  5. Fix the cause. We put better processes in place so it does not recur, including through our Self-Assessment service.

Why ASWATAX

You get a named Chartered Tax Adviser, Omar Aswat, who handles your case personally. We are commercially minded, calm under pressure and clear about the downsides as well as the upsides. We have advised over 300 clients across 15+ years. The firm is Rated 5.0 on Google.

Talk to us

If HMRC has written to you, or you know something needs correcting, book a free first call or contact us. We reply the same working day, and the first conversation is confidential. This page is general information, not advice on your case.

01 · Guide in progress

What to Do When HMRC Writes to You

A step-by-step guide to reading an HMRC letter, the deadlines that matter and how to respond without making things worse.

Talk it through instead

Our What to Do When HMRC Writes to You is being written. In the meantime, a 20-minute call with a Chartered Tax Adviser is free.

Book a free call

We reply the same working day.

0416 questions

Questions, answered.

Straight answers to what clients ask us most. Your own situation may differ, so treat them as a starting point.

Q1I have received a letter from HMRC about my tax return. What should I do first?

Do not ignore it and do not rush a reply. Note the date, the tax year, the reference and the deadline. Then work out whether it is a routine query, a formal enquiry into your return, or an invitation to review your position. Send us the letter and we will explain it, check the figures and reply on your behalf. A measured first response protects your position.

Q2What is an HMRC enquiry into a personal tax return?

It is a formal check under which HMRC can ask about anything in your return, a single entry or the whole return. HMRC must open it within 12 months of the day you filed on time. It ends when HMRC issues a closure notice with its conclusions, which you can appeal. Most enquiries are opened because something looks inconsistent, and many end with no change.

Q3What is an HMRC nudge letter?

A nudge letter is a prompt from HMRC, based on data it holds, inviting you to check whether you have declared everything. It is not a formal enquiry and does not accuse you of anything. HMRC has used them for overseas assets, crypto, property income and other areas. A careful, evidence-based response is better than ignoring it or admitting to things you have not checked.

Q4How far back can HMRC go?

The standard time limit is four years from the end of the tax year. It is six years if the error was careless, and 20 years if it was deliberate. For income tax, capital gains tax and inheritance tax involving offshore matters, HMRC generally has 12 years even without carelessness. These limits decide how many years a disclosure needs to cover, so we establish them early.

Q5What penalties could I face for an error in my return?

For inaccuracies, the penalty is a percentage of the extra tax: up to 30% for carelessness, 70% for deliberate but not concealed, and 100% for deliberate and concealed. The actual figure is reduced for the quality and timing of disclosure, and an unprompted disclosure of a careless error can reduce it to nil. Offshore matters carry higher maximum rates, so the facts matter greatly.

Q6What is the Worldwide Disclosure Facility?

It is HMRC's route for voluntarily disclosing UK tax owed on offshore income, assets or activity. You notify HMRC online of your intention, then have 90 days to calculate the liabilities and make the disclosure, with up to 180 days in complex cases. The full amount of tax, interest and penalties is expected to be paid with the disclosure. It does not protect against prosecution for deliberate wrongdoing.

Q7What is COP9 and should I be worried if I get it?

COP9, Code of Practice 9, is HMRC's civil fraud procedure. It is used where HMRC suspects tax fraud but has not started a criminal investigation. You are offered the Contractual Disclosure Facility, with 60 days to accept. If you do, you make a full disclosure and HMRC agrees not to investigate the disclosed conduct criminally. It is serious: get advice before responding, and do not delay.

Q8Should I make a voluntary disclosure to HMRC?

If you know of an error or omission, usually yes, because disclosing before HMRC approaches you normally leads to lower penalties. The right route depends on the facts: a simple amendment, a letter, the Worldwide Disclosure Facility for offshore matters, or the Contractual Disclosure Facility where deliberate behaviour is involved. We assess exposure first so that the disclosure is complete and correct.

Q9Does HMRC check inheritance tax and gifts?

Yes. HMRC can query inheritance tax accounts, valuations and claims for reliefs, and may look at gifts made in the seven years before death. Missing records and unreported lifetime gifts cause most problems. The same time limits apply as for other taxes, with 12 years for certain offshore matters. We help executors and families respond and, where possible, tidy up before a death.

Q10HMRC has asked about my overseas bank account. What does that mean?

HMRC receives data from many countries about accounts held by UK residents, and uses it to check that interest, income and gains have been reported. The enquiry may be a polite query or the start of a wider check. We establish whether the income was declared, whether any tax was due, and what the disclosure and penalty position is before responding.

Q11Can I be investigated if I left the UK or my residence status is unclear?

Yes. HMRC can ask whether you were really non-resident, particularly where you kept a UK home, family or work ties, or where large gains arose around departure. It may compare your travel records with your claimed days. We rebuild the day count and ties, test the residence position, and present the evidence in an organised way. See our Residency page for the underlying rules.

Q12Do I have to attend a meeting with HMRC?

Not necessarily. Most enquiries run by letter. If a meeting is requested, we prepare you, attend with you and can usually speak for you on technical points. A meeting is normally voluntary, but declining can lead HMRC to use its formal information powers, and cooperation counts when penalties are set. We decide with you what is sensible, based on what HMRC is looking for.

Q13Can HMRC demand information from my bank or other parties?

HMRC has statutory powers to request documents and information from taxpayers and, in some cases, from third parties such as banks. It generally asks you first. Withholding or delaying information tends to raise concerns and can lead to penalties. We review what is requested, challenge anything excessive, and make sure what you do provide is accurate and complete.

Q14Will ASWATAX deal with HMRC for me?

Yes. Once you authorise us as your agent, we handle correspondence, calls and meetings. You stay informed and approve anything that is sent. Your contact is Omar Aswat, a Chartered Tax Adviser, rather than a call centre. We also explain what HMRC's questions are really aiming at, so you understand where you stand throughout.

Q15What happens if HMRC thinks I owe more tax?

HMRC will issue a closure notice or assessment setting out the tax, interest and any penalty. You can agree, negotiate or appeal, usually within 30 days, and ask for an independent review or the tax tribunal if you cannot agree. We examine the technical case and the figures before you decide.

Q16How can I reduce the chance of an HMRC check in future?

Keep clean records, report all income and gains, explain unusual items in the white space on your return, and keep evidence of residence and valuations. Check any third-party data, such as bank interest or exchange statements, before you file. A review of your return before submission, which is part of our Self-Assessment service, is the best protection.

05 · Next step

Talk it through with Omar.

The first call is free. You'll speak to a Chartered Tax Adviser, and leave with a clear view of your options.

We reply the same working day.

Chartered Tax Adviser