HMRC Voluntary Disclosure Penalty Calculator — Prompted vs Unprompted

A voluntary disclosure is when you proactively tell HMRC about errors or omissions in your tax returns before HMRC discovers them. An 'unprompted' disclosure happens before HMRC contacts you. A 'prompted' disclosure happens after HMRC sends a nudge letter, opens an enquiry, or otherwise contacts you about the issue.

HMRC categorises behaviour into: (1) Careless — you failed to take reasonable care (max 30% penalty), (2) Deliberate — you knew the return was wrong but didn't conceal it (max 70%), (3) Deliberate and concealed — you actively hid the error from HMRC (max 100%). Higher penalties for offshore matters.

For each behaviour category, there's a penalty range (e.g., 0-30% for careless). The reduction within the range depends on the 'quality' of disclosure: how well you've helped HMRC understand the issue, provided information, and given access to records. Full cooperation achieves the minimum penalty.

An unprompted disclosure is when you contact HMRC before they contact you about the specific issue. This can reduce the minimum penalty to zero for careless errors. Once HMRC sends even a nudge letter or opens an inquiry, any disclosure becomes 'prompted' and minimum penalties are higher.

Yes. Category 1 offshore territories have the same penalties as domestic (the UK has information exchange agreements). Category 2 territories have penalties of up to 150% of the domestic equivalent. Category 3 territories (least cooperative) carry penalties up to 200%. This was introduced to address offshore tax evasion.

Key facilities include: (1) The Contractual Disclosure Facility (CDF) for serious fraud, (2) Let Property Campaign for rental income, (3) Offshore Disclosure Facility, (4) Self-employed income disclosure, (5) Worldwide Disclosure Facility for offshore assets. Using the wrong facility can affect penalty levels.

HMRC charges interest at the Bank of England base rate plus 2.5% on unpaid tax. For 2025/26 this is approximately 7.75%. Interest runs from the original payment due date, so older errors can have substantial interest on top of the tax and penalty.

Penalties can be suspended (not payable) for up to 2 years if conditions are set to improve future compliance. Suspension is typically available for careless behaviour, not deliberate. If the conditions are met, the suspended penalty is cancelled.

If HMRC discovers the error themselves, penalties will be charged at the higher 'prompted' rates (potentially 35-100% for deliberate behaviour). There's no opportunity to reduce via cooperation quality if HMRC has already found the issue. Self-reporting before discovery is always significantly cheaper.

HMRC can investigate 4 years back for careless errors (reduced to 4 years from 31 January deadline), 6 years for careless errors in some circumstances, 20 years for deliberate errors, and up to 12 years for offshore matters. The time limits are complex — specialist advice is essential for older errors.

Interest is charged on the unpaid tax itself, running from the original due date to the date paid. Penalties do not attract interest in the same way, but they must also be paid by a deadline or late payment surcharges apply. The total liability (tax + interest + penalty) must be paid in full as part of any settlement.

It's strongly recommended. A qualified tax adviser or specialist disclosure solicitor can: assess the correct behaviour category (which drives penalty rates), identify the right HMRC disclosure facility, negotiate with HMRC for the best possible outcome, and ensure the disclosure is complete (partial disclosures can be treated as deliberate).