Every number,
traceable.
Transparency is foundational to FiscalFold. Every tax figure on this platform is deterministic — computed from official statutory rates, not generated by AI.
Deterministic by Design
Every tax figure on this platform is computed by an engine that applies official statutory bracket rates slice by slice. The math is deterministic — the same input always produces the same output. No AI, approximation, or black-box estimate is ever involved in a tax number.
Our Data Sources
Calculation Methodology
Tax Bracket Application
Income is taxed progressively — each portion is taxed at the rate for that bracket. The effective rate is always lower than the marginal rate.
Standard Deductions
Each country's standard deduction or personal allowance is applied before bracket calculation. For example, the US standard deduction for 2026 is $16,100 (single).
Social Contributions
Employee-side social security contributions (FICA in the US, NICs in the UK, etc.) are calculated separately and shown alongside income tax for a complete picture.
Limitations & Disclaimers
! FiscalFold provides estimates only. These are not tax filings and do not constitute tax advice.
! Regional/state/municipal taxes are not included (e.g., US state taxes, Spanish autonomous community surcharges).
! Germany uses continuous formulas, not flat brackets. Our bracket approximation may differ slightly from precise amounts.
! Only standard deductions are applied. Itemized deductions, credits, and special exemptions are not computed.
! Always consult a licensed tax professional before making financial decisions based on these calculations.