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Free UK Tax Tools 2025/26 — IR35, SDLT, CGT & More | Aitaxo

Free UK tax calculators and checkers. IR35 checker, SDLT calculator, salary & dividend optimiser, crypto tax, and more. No login required.

Interactive UK Tax Tools

Access our suite of free online calculators and tools built to simplify UK compliance, tax planning, and payroll checking.

  • ✓ IR35 status checkers
  • ✓ Stamp Duty (SDLT) calculators
  • ✓ Salary vs dividend optimisers
  • ✓ Crypto capital gains calculators
  • ✓ National Insurance monitors