Free Taxes Tools
Free federal tax calculators that use the actual IRS brackets, statutory formulas, and Treasury Regulations — not approximations. Estimate your full Form 1040 liability with the standard deduction, common credits, and all five filing statuses. Compute self-employment tax under Schedule SE (the 92.35% × 15.3% formula with SS wage base + Medicare + Additional Medicare). Project your quarterly 1040-ES payments with the safe-harbor underpayment-penalty check. Run capital-gains scenarios across short-term ordinary brackets vs long-term 0/15/20% with NIIT.
All math is grounded in the specific IRC sections (§ 1 for brackets, § 86 for SS taxation, § 1402 for SE tax, § 1411 for NIIT, § 6654 for the safe harbor) and IRS Rev. Proc. annual inflation-adjustment notices. Every calculator runs entirely in your browser. Your income, deductions, gains, and dependents never leave your device.
4 free tools available now
Self-Employment Tax Calculator (Schedule SE)
Compute Schedule SE tax with SS wage base, Medicare, Additional Medicare, and the deductible-half offset
Quarterly Estimated Tax Calculator (Form 1040-ES)
Compute Form 1040-ES quarterly payments with the IRC § 6654 safe-harbor underpayment-penalty check
Capital Gains Tax Calculator
Compute short-term vs long-term capital gains tax with NIIT and the "hold to long-term" scenario
Federal Income Tax Estimator (2026)
Full Form 1040 estimate with wages, 1099, gains, all 5 filing statuses, standard/itemized, CTC, SE tax, LTCG, NIIT
All free taxes tools
Every tool listed below is 100% free, requires no account, and runs entirely in your browser — your data never leaves your device.
🧮 Free Self-Employment Tax Calculator (Schedule SE)
Free Schedule SE calculator using the IRS 92.35% × 15.3% formula with SS wage base ($176,100 for 2025), Medicare 2.9% uncapped, and Additional Medicare 0.9% above the IRC § 1401(b)(2) threshold. Includes the deductible-half above-the-line offset and quarterly 1040-ES payment suggestion. No signup required.
📅 Free Quarterly Estimated Tax Calculator (Form 1040-ES)
Free Form 1040-ES quarterly estimated tax calculator with the IRS safe-harbor rule (90% current OR 100/110% prior year) per IRC § 6654. Shows quarterly payment amount, due dates, and underpayment-penalty risk flag. No signup required.
📉 Free Capital Gains Tax Calculator
Free capital gains tax calculator using IRC § 1(h) long-term rates (0/15/20%) per IRS Rev. Proc. 2024-40 § 3.03, plus NIIT 3.8% (IRC § 1411). Shows short-term vs long-term comparison and tax savings from holding to long-term. No signup required.
🧾 Free Federal Income Tax Estimator (2026)
Free Form 1040 federal income tax estimator using 2025 IRS brackets (Rev. Proc. 2024-40), standard deduction, Child Tax Credit (IRC § 24), SE tax, LTCG with proper stacking, and NIIT. All 5 filing statuses. No signup required.