Tax calculations should be deterministic, transparent, and grounded in real data. Too many online calculators rely on oversimplified approximations or opaque AI hallucinations. FiscalFold does neither — every figure on this site is pulled from an official statutory table and verified against its publication of record before it ships.
What we cover
Twelve countries — the United States, Canada, the United Kingdom, Germany, France, Spain, Singapore, Australia, UAE, Ireland, the Netherlands, and Sweden — with full bracket data, standard deductions or tax credits, and relevant social contributions for the 2026 tax year. Fifty US states with federal + state + FICA combined. Side-by-side comparisons for any pair at any income level.
How the math works
Every figure is computed slice-by-slice from official statutory bracket tables. It's deterministic arithmetic — the same income always produces the same result — with no AI, approximations, or black-box estimates anywhere in the calculation.
Where the numbers come from
Eighteen official documents form the entirety of our source base. Nothing else informs the site.
- United States — IRS Revenue Procedure 2025-32, IRS Publication 15-T
- Canada — CRA Federal Income Tax Rates notice
- United Kingdom — HMRC CWG2, HMRC Income Tax rates & allowances
- Germany — Einkommensteuer-Tarif, § 32a EStG
- France — DGFiP Brochure IR, barème IR 2026
- Spain — Agencia Tributaria IRPF tarifa estatal
- International — OECD Taxing Wages 2024, OECD Tax Database
Important disclaimer
FiscalFold provides tax calculations for informational and educational purposes only. Our calculations are estimates based on statutory rates and standard deductions. They do not account for all credits, exemptions, local surcharges, or individual circumstances. Always consult a qualified tax professional for advice specific to your situation.
Get in touch
Have questions, feedback, or data corrections? Contact us at [email protected]. We take data accuracy seriously and welcome corrections backed by official source documents.