Undeclared OnlyFans income in the UK: how to put it right with HMRC before HMRC writes first.

If you have OnlyFans income you never declared, the route is HMRC's Digital Disclosure Service: you notify HMRC online, then have 90 days from its acknowledgement to send the disclosure and pay the tax, interest (7.75% a year since 9 January 2026) and a penalty. For a creator who simply never registered and comes forward before HMRC writes, the penalty can be 0% if it is done within 12 months of the tax falling due; after a letter from HMRC, the minimum rises. How many years you disclose depends on your behaviour and on whether you ever registered: 4, 6 or up to 20.

The basics of registering and filing are in our guide to OnlyFans tax and Self Assessment in the UK. This page is for the creator who is already behind.

How does HMRC know about OnlyFans income?

Since 1 January 2024, UK digital platform operators must collect information about their sellers and report it to HMRC every year, by 31 January following the calendar year. For an individual in the UK, that includes the name, address, date of birth and National Insurance number, with the amounts paid. The exemption for fewer than 30 sales and under €2,000 applies to sellers of goods only. A creator provides a service, so there is no minimum.

The platform must also give you a copy of what it reported. If you have received one, HMRC has it too.

HMRC then compares this data with Self Assessment records. Its transformation roadmap sets out plans to use HMRC and third-party data for targeted, data-driven nudges in 2026 to 2027. If your figures do not match, expect a letter asking you to check your tax position. It will be polite. It also changes the penalty position, as explained below.

Are you late yet?

Not always. The obligation is to tell HMRC by 5 October after the end of the tax year in which your trading income first went over £1,000.

If your first year over £1,000 was 2025/26 and you read this before 5 October 2026, you are not late: register for Self Assessment in the normal way and file by 31 January 2027. If you started earlier, the years already missed are a disclosure.

What penalties apply to undeclared OnlyFans income?

Penalties are a percentage of the tax that went unpaid, which HMRC calls potential lost revenue. Two regimes matter.

A creator who never registered falls under the failure to notify penalties. A creator who filed returns but left the OnlyFans income out falls under the penalties for inaccuracies. Both turn on the same two questions: why it happened, and whether you told HMRC before it had reason to think it was about to find out.

For inaccuracies in a return, the ranges are similar: careless 0% to 30% unprompted and 15% to 30% prompted; deliberate 20% to 70% and 35% to 70%; deliberate and concealed 30% to 100% and 50% to 100%.

Where you land inside each range depends on the quality of the disclosure: telling HMRC, helping it quantify the tax, and giving access to your records. A complete, well-documented disclosure moves you towards the minimum.

HMRC does not charge a failure to notify penalty where there was a reasonable excuse and you fixed it without unreasonable delay. HMRC's published list of what does not count includes not receiving a reminder and finding the online system too difficult to use.

A worked example

A creator made £20,000 of profit in 2024/25, had no other income and never registered. The tax for that year:

• income tax: 20% of (£20,000 minus £12,570) = £1,486
• Class 4 National Insurance: 6% of the same £7,430 = £445.80
• total: £1,931.80, due on 31 January 2026.

If she discloses unprompted before 31 January 2027, the non-deliberate range is 0% to 30%, so a very good disclosure could carry no penalty at all. If she waits for HMRC's letter, the minimum becomes 10%, about £193. If HMRC concludes she knew and chose not to declare, the prompted minimum is 35%, about £676. Interest runs on top from 31 January 2026, at around £150 a year at the current rate.

How far back does HMRC go?

HMRC's disclosure guide sets the number of years by behaviour:

• 4 years if you took reasonable care and registered for Self Assessment on time
• 6 years if you were careless
• up to 20 years if you deliberately misled HMRC, or if you failed to notify HMRC at all

The last point catches many creators. Someone who started in 2019 and never registered has failed to notify, and the Taxes Management Act 1970 (section 36(1A)) allows assessments up to 20 years back in that case, so every year since 2019/20 is in scope even if it was only carelessness. A creator who did file returns but left the OnlyFans income out is on 6 years if it was careless, and up to 20 if it was deliberate. Behaviour still sets the penalty range. The distinction is a factual one. Did you know the income was taxable? Did you take steps to hide it, such as routing payouts to someone else's account? Be accurate: overstating innocence in a disclosure that HMRC later disproves costs more than the difference in penalty.

How does the Digital Disclosure Service work?

1. Gather the figures. Download platform statements for each tax year (6 April to 5 April), across every platform. Reconstruct expenses from bank records. Split the income by tax year, not by calendar year.
2. Notify HMRC. Sign in to the Digital Disclosure Service and tell HMRC you intend to disclose. It acknowledges the notification with a disclosure reference.
3. Disclose within 90 days. Enter the income, expenses, tax, interest and the penalty you propose, with the reasons for your behaviour category. HMRC may ask how you worked out any estimate, so keep the workings.
4. Pay with the disclosure. Payment is expected at the same time. If you cannot pay in full, call HMRC before you send the disclosure.
5. Register for the future. Make sure the current year is filed normally through Self Assessment, so the disclosure closes the past instead of opening a new gap. If your gross income is now above £50,000, or above £30,000 for 2025/26, check whether Making Tax Digital for Income Tax applies to you: it brings quarterly digital updates on top of the annual return.

HMRC may come back with questions. If it later receives information showing the disclosure was wrong, it can reopen your affairs.

Should you do this alone?

A small, simple disclosure, one or two years of straightforward income, can be done by the creator. Several years, several platforms, foreign payouts, an agency split or an argument about behaviour are a different matter. At OFM Legal, a consultancy specialising in the OFM industry, we prepare the facts and the structure going forward, and a partner chartered accountant or tax adviser prepares and submits the disclosure. Since 18 May 2026, tax advisers who deal with HMRC for clients must register with HMRC, which our guide to choosing an OnlyFans accountant explains.

If the income is now large enough to justify it, the future structure is worth looking at in the same exercise; see sole trader or limited company.

This page is general information on UK tax rules, not tax advice for your situation. OFM Legal is not a law firm, a chartered accountant or a registered tax adviser.

Your contactOlivier MaciejewskiFounder of OFM Legal · Former international business lawyer (HEC Paris, Arendt, Clifford Chance) · Official MYM partnerHis background Updated October 1, 2026

This article is general information and does not replace advice tailored to your situation. OFM Legal is not a law firm: court proceedings are handled by our partner lawyers.

Our partners

See all our partners

Read next

Tax & structureMoving to Dubai: the real pictureRead the article Tax & structureOnlyFans tax write-offs (US)Read the article Tax & structureThe OnlyFans 1099, explainedRead the article