No sign-up required · 2024 & 2025 tax years

Calculate your quarterly estimated tax

A standalone calculator supporting IRS Form 2210 Schedule AI — the Annualized Income Installment Method.

For investors, freelancers, and high-income earners with uneven income who want to avoid overpaying early in the year. Shows the full step-by-step math, not just a number.

Calculate my quarterly payment →

By continuing, you agree to the legal disclaimer below. This tool does not constitute tax advice.

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Schedule AI support

Full IRS Annualized Income Installment Method. Not buried inside a $100 filing suite — just the calculator you need.

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Full math transparency

Shows every step of the Form 2210 calculation so you can verify the math and understand exactly what you owe.

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Instant, in-browser

All calculations run locally in your browser. No data sent to any server. No sign-up. No subscription.

Who is this for?

→Investors with lumpy capital gains — big year-end sale or RSU vests
→Freelancers and consultants with variable quarterly income
→High-income earners who get hit with Net Investment Income Tax or Additional Medicare Tax
→Anyone who wants to avoid estimated tax penalties without overpaying each quarter

Legal Disclaimer

EstimatedTax.ai is provided for informational and educational purposes only and does not constitute tax advice, legal advice, or any other professional advice. The calculations generated by this tool are estimates based on user-provided inputs and published IRS rules for the selected tax year, and may not reflect your actual tax liability.

This tool does not account for all possible income types, deductions, credits, or circumstances that may affect your tax situation — including but not limited to Alternative Minimum Tax (AMT), state and local taxes, foreign income, or prior-year adjustments. Results should not be used as the sole basis for any tax payment, filing decision, or financial planning.

EstimatedTax.ai makes no warranties — express or implied — regarding the accuracy, completeness, or fitness for a particular purpose of the calculations provided. We are not liable for any underpayment penalties, interest charges, or other consequences arising from reliance on results generated by this tool. Always consult a qualified tax professional (CPA, Enrolled Agent, or tax attorney) before making tax payments or filing decisions.