United States model
Federal income tax, employee FICA and optional state income tax for a resident employee.
- Uses the 2026 single-filer standard deduction by default.
- FICA is modelled as 6.2% Social Security up to the wage base, 1.45% Medicare on all wages and 0.9% Additional Medicare above $200,000 ($250,000 for the married approximation).
- State tax is selected separately; local, itemised deductions and credits are excluded.
