Free UK tax tools for online sellers

Free profit calculators & tax checker for UK online sellers

See every marketplace fee, what you actually keep, and whether you need to tell HMRC. No login, no cost, about 60 seconds.

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How it works

  1. Answer a few questions

    Tell us what and how you sell. No sign-up, no personal details stored.

  2. Get a plain-English answer

    See whether you look like you’re trading and if the rules apply to you.

  3. Know your real profit

    Factor in marketplace fees and a rough tax set-aside, with every source dated.

Guides & explainers

Plain-English guides on selling online and UK tax:

All guides →