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1040-ES safe-harbor + Solo 401(k)/SEP-IRA sizing + §199A QBI phase-out. Avoid Form 2210 penalty, hit April 15 plan deadline. Free. Stop guessing what you owe the IRS. Freelancer Tax Estimator calculates your self-employment taxes in real time using 2026 tax brackets (permanently extended by OBBBA). Enter your freelance income, see exactly what you owe — broken down by: - Federal income tax (2026 brackets: 10% to 37%) - Self-employment tax (15.3% SECA — Social Security + Medicare) - State income tax (all 50 states + DC) - Quarterly estimated payment amounts with due dates - Combined effective tax rate Works for freelancers, contractors, gig workers, and anyone with 1099 income. Handles W-2 + 1099 combined income scenarios — see how side hustle earnings stack on top of your day job bracket. **Why this is different from generic tax calculators:** - Self-employment tax calculated correctly (employer + employee halves, with deduction for employer half) - Quarterly estimated payment amounts with actual 2026 due dates (April 15, June 16, September 15, January 15) - State tax for all 50 states (including no-income-tax states flagged) - W-2 + 1099 stacking shows your true marginal rate on freelance income - 2026 OBBBA-permanent tax brackets (not the reverted pre-2017 rates some calculators still show) WHY AN EXTENSION? Web calculators make you bookmark a page and navigate back every time. This lives in your toolbar. One click, instant numbers. Update your income mid-quarter, check your new quarterly amount — takes 5 seconds. FREE TIER: Federal tax + self-employment tax + quarterly estimates PRO ($4.99): State tax for all 50 states + W-2/1099 stacking + deduction optimizer No signup. No data collection. Runs entirely in your browser. Your financial data never leaves your computer. Built by the team behind QuantCalc.app — the Monte Carlo retirement planner used by FIRE community members and financial advisors.