TaxHeaven gives self-employed workers, freelancers, sole traders, and landlords instant UK tax answers using HMRC-published rates, right inside ChatGPT.
8 tools cover the full self-employed tax journey:
- Calculate income tax, National Insurance, and take-home pay (England and Scotland)
- Check if Making Tax Digital (MTD) applies to you and when it starts
- See all your tax deadlines with countdown timers
- Work out your payments on account and how much to save monthly
- Add or remove VAT, compare the Flat Rate Scheme, check registration thresholds
- Find out if an expense is tax-deductible under HMRC rules
- Calculate capital allowances on business equipment and vehicles
- Scan receipts and categorise them for your tax return
All calculations use official HMRC rates for 2024-25 through 2026-27. No sign-up required, no data stored, MTD compliance completely free from HMRC-recognised software.
Screenshots
How to use
- 1Add it in ChatGPT
Open TaxHeaven in ChatGPT's Plugin directory (button above), select + to add it and sign in if asked.
- 2Use it in a chat
Type @ in the composer and pick TaxHeaven, or start your message with its name. ChatGPT may also suggest it when it fits what you ask.
Things to ask
- “I'm self-employed in the UK earning £65k a year. What's my tax bill ?”
- “I'm a freelancer earning £55,000 a year. Do I need to use Making Tax Digita”
- “🧾 Scan and categorise this receipt for my tax records”
Disconnect
- 1Disconnect it in ChatGPT
Open Settings, then Apps or Plugins (the label depends on your rollout), select TaxHeaven and choose Disconnect. ChatGPT stops acting through your account; past conversations aren't deleted.