Guides
How the figures in the calculator are worked out, with examples. Each guide lists the IRS pages it relies on.
- US federal tax brackets and standard deduction for 2026The 2026 federal income tax brackets and standard deduction for single, joint and head of household filers, worked step by step at three salaries.
- FICA in 2026: Social Security, Medicare and the Additional Medicare TaxHow Social Security (6.2% up to $184,500), Medicare (1.45%) and the 0.9% Additional Medicare Tax are worked out for 2026, with examples at five salaries.
The guides are general information. Rates as at November 2, 2026.