IRS Quarterly Estimated Tax Calculator
Pay min(annual liability, 100% of prior year tax, 110% if prior AGI > $150k) ÷ 4 per quarter to avoid underpayment penalty.
- Safe harbor (lesser of)
- —
- Need to pay (annual)
- —
- Per quarter
- —
2025 quarterly due dates — Apr 15, Jun 16, Sep 15, Jan 15 2026. Underpayment penalty avoided if total paid ≥ safe harbor amount.
About this tool
IRS Quarterly Estimated Tax Calculator is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
Category: Tax & Government — US Federal. Browse more Tax & Government — US Federal tools.