Data sourced from official government publications:
See spec/uk.md for full specification and test cases.
⚠️ Disclaimer
- This calculator provides estimates only based on official 2024-2026 tax rates. It is not financial, tax, or legal advice.
- Calculations assume standard employment scenarios and annualized figures. Actual payslips may differ due to pay-period rounding, tax codes, benefits, employer settings, and local variations.
- UK: England, Wales, NI, Scotland only. No Isle of Man, Channel Islands, or non-UK residents.
- US: Federal + 50 states + DC + major local. No AMT detail, NIIT, QBI, self-employment tax, or all 10,000+ local jurisdictions.
- Always verify with your payslip, payroll department, or qualified CPA/tax adviser.