HMRC Red Flag Checker

HMRC now receives a lot more third-party data than it used to, from digital platforms, overseas banks, the Land Registry and crypto exchanges. The areas most likely to attract attention are usually the ones where what you have declared does not match what HMRC can already see. This tool walks through the six biggest red flag areas in 2026 and tells you, based on your situation, which of them apply to you, what you should be declaring, and roughly what you may owe.

It is a quick screening check, not a full tax return, but it will tell you whether you have something to put right and which TheTaxGuide tool to use for a precise calculation. If you have any comments or would like additional tools, please leave a comment at the bottom of this page.

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Roughly what was your total declared income on your last UK tax return?

Did you receive more than £1,000 of side-hustle or platform income last tax year? (eBay, Etsy, Vinted, Airbnb, Uber, Fiverr and similar)

Have you bought, sold or swapped any cryptoassets in the last tax year?

Do you receive any rental income?

Are you a director or shareholder of your own UK company?

Do you have any income, bank accounts, investments or property outside the UK?

Have you ever received an HMRC nudge letter or compliance enquiry about any of these areas?

Anything else HMRC should know about your situation? (optional)

Your privacy is protected. We do not store any personal information including names, addresses or other details you enter. All personal data is automatically removed from our records.

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This tool gives general guidance about HMRC compliance risks based on the information you provide. It is not regulated tax advice. For your specific circumstances, consult a qualified accountant or contact HMRC directly. Any figures produced are rough estimates only.

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