How it works
Federal tax uses the 2026 single-filer brackets from 10% to 37% after the $16,100 standard deduction. Social Security is 6.2% up to $184,500 and Medicare is 1.45%, plus 0.9% above $200,000. Pre-tax 401(k)-style contributions reduce income tax but not Social Security or Medicare. Brackets and the standard deduction match the IRS 2026 inflation adjustments, and the Social Security wage base is $184,500.