Open1040

Free, transparent tax preparation for simple federal returns.

What this is

Open1040 is a free, open-source tool that helps you understand and prepare a simple federal income tax return. It shows you every calculation, explains every number, and never hides anything behind a paywall.

Single filerW-2 wage income onlySimple bank interest income (optional)Standard deductionFederal return onlyTax year 2025

What this is not

This tool does not file your return with the IRS. It does not handle complex tax situations. If any of the following apply to you, please use a comprehensive tax service or consult a professional.

Married filing jointly/separatelyHead of householdSelf-employment / 1099-NECCapital gains (stocks, crypto, property)Rental incomeForeign incomeItemized deductionsDependentsComplex tax creditsState tax returnsE-filingPrior year amendments

Open1040 is a free, open-source educational tool that helps you understand your simple federal tax return. It is NOT a tax filing service. It does NOT submit returns to the IRS. It does NOT constitute tax advice, legal advice, or financial advice. Always consult a qualified tax professional for your specific situation.

Free forever · No account required · Your data stays in your browser