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Model ordinary federal income tax for single, joint, head-of-household or separate filers. See each tax bracket and the assumptions.

Estimate Social Security and Medicare tax on sole-proprietor profit, accounting for your own W-2 wages and the 2026 wage base.

Compare the general current-year and prior-year safe-harbor targets, then model four equal installments. Timing exceptions still matter.

Organize income, business records, deductions and payment confirmations before preparing your return. Progress stays in this browser.