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HMRC Enquiries & Disclosures
Hoxton Tax • HMRC Enquiries & Disclosures
HMRC Enquiries & Disclosures
HMRC enquiries and disclosures can arise for a number of reasons, from routine compliance checks through to more detailed reviews of specific transactions or historic positions. Whether the issue relates to omitted income, incorrect reporting or a more complex technical matter, early and considered action is key.
Where a disclosure is required, the approach taken can significantly impact both the outcome and the level of penalties applied. HMRC’s penalty regime is behaviour-based, meaning the extent of any penalty will depend on whether the error is considered careless or deliberate, and whether the disclosure is prompted or unprompted. Demonstrating transparency, accuracy and cooperation can materially reduce penalties, whereas delays or incomplete disclosures can increase exposure.
Equally, where HMRC opens an enquiry, the way the position is managed, including how information is presented and the level of engagement, can influence both the technical outcome and the overall cost of resolution.
How does this impact you?
HMRC enquiries can be triggered by a range of factors, including discrepancies in tax returns, unusual transactions, third-party data (such as from banks or overseas authorities), or routine compliance checks. In many cases, enquiries are selected on a risk basis rather than because of a specific concern.
HMRC generally has 12 months from the date a tax return is filed to open an enquiry. However, if an enquiry is not opened within that window, HMRC may still be able to go back further using “discovery” powers where they identify that tax has been underpaid. In those cases, the look-back period depends on behaviour - typically up to 4 years for innocent errors, 6 years for careless errors, and up to 20 years where the behaviour is considered deliberate.
An unprompted disclosure is made before HMRC contacts you about a matter, whereas a prompted disclosure is made after HMRC has already opened an enquiry or raised questions. Unprompted disclosures generally result in significantly lower penalties.
Penalties are based on behaviour (careless or deliberate), whether the disclosure is prompted or unprompted, and the quality of the disclosure provided. The more complete, accurate and cooperative the disclosure, the greater the potential reduction in penalties.
Yes. HMRC allows reductions in penalties where taxpayers are transparent, provide full information, and engage constructively throughout the process. Early and well-managed disclosures can materially reduce overall exposure.
The total liability may include the underlying tax due, interest on late payment, and penalties. The final amount will depend on the nature of the issue, how long it has persisted, and the behaviour attributed by HMRC. In some cases, penalties can be significantly reduced where disclosure is made early and handled appropriately.
If an error is identified, it is generally advisable to correct it as soon as possible. This may involve amending a return (if within time limits) or making a formal disclosure to HMRC. Taking proactive steps can reduce both penalties and the risk of further scrutiny.
You may need to provide evidence supporting your UK and overseas presence, such as travel records, flight bookings, passport stamps, accommodation details, work diaries, and evidence of ties to the UK (for example, family, accommodation or work). Maintaining clear and contemporaneous records is essential where residence status is in question.
A “nudge” letter is a communication from HMRC indicating that they hold information suggesting your tax affairs may require review - often in relation to specific areas such as overseas income, property or investments.
It is not a formal enquiry, but it is a prompt to check whether your tax reporting is complete and accurate. In many cases, HMRC uses data from third parties or international information exchange to issue these letters.
If you receive a nudge letter, it is important to review your position carefully and take advice where needed, as it may be appropriate to make a disclosure to HMRC.
While not mandatory, professional support can help ensure that responses are accurate, positions are presented clearly, and the process is managed efficiently. This can reduce stress, minimise risk, and often lead to a more favourable outcome.
Fee protection is a service that covers professional fees incurred in dealing with an HMRC enquiry into your tax return. Where Hoxton Tax has prepared your tax return, we offer fee protection to help manage the cost of responding to an enquiry, providing reassurance that the focus can remain on resolving the matter rather than the associated professional fees.
Why Hoxton?
We bring clarity and control to what can otherwise be a complex and uncertain process. From first contact through to resolution, we manage HMRC engagement carefully, present positions with precision, and focus on reducing both risk and disruption.
Our approach is structured, proactive and designed to ensure that issues are resolved efficiently and with the best possible outcome.
We support clients with:
• Responding to HMRC enquiries opened under formal enquiry notices (S9A) — managing the process from initial notice through to resolution, ensuring responses are clear, timely and aligned to your overall position
• Advising on and managing HMRC discovery assessments — assessing validity, advising on next steps, and supporting in responding to historic assessments raised outside of the standard enquiry window
• Responding to HMRC “nudge” letters and data-led enquiries — reviewing the underlying position, advising on whether action is required, and managing any follow-up with HMRC
• Preparing and submitting voluntary disclosures (prompted and unprompted) — ensuring disclosures are accurate, complete and positioned to minimise penalties
• Quantifying liabilities, presenting technical positions and managing HMRC engagement — calculating tax, interest and penalties, responding to HMRC requests, and working proactively to reduce exposure and reach an efficient resolution
In a landscape where HMRC interaction can be complex and sensitive, we provide the clarity and control needed to move forward — taking a practical, no judgement approach throughout.
Case Study: Defending a Residence Position Under HMRC Enquiry
A UK resident client received an HMRC “nudge” letter in relation to overseas income and gains. The client had understood that the relevant taxes were being dealt with in another jurisdiction and had no expectation of a UK liability.
We undertook a detailed review of the client’s position, including consideration of the relevant double taxation agreement, to determine whether the income and gains remained taxable in the UK. This identified that elements of the income had not been fully reported in the UK.
A disclosure was prepared and submitted through HMRC’s Digital Disclosure Service, quantifying the tax, interest and potential penalties, and setting out a clear explanation of the client’s position and understanding.
Through proactive engagement and careful presentation, we were able to agree that the behaviour was careless rather than deliberate, significantly reducing the level of penalties applied. The matter was resolved efficiently, providing the client with clarity and certainty moving forward.
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