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Estimated Tax Payment Calculator

Compute quarterly estimated tax payments and their due dates.

Updated for the 2026 tax year · Last data update May 19, 2026
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How to Use

  1. Enter your expected annual income.
  2. Select your filing status.
  3. Enter last year's total tax for the safe-harbor rule.
  4. Optionally enter expected withholding.
  5. Review your quarterly payment and due dates.

Calculation Method

Required annual payment is generally the lesser of 90% of this year's projected tax or the safe harbor (100% of last year's tax, or 110% if income > $150,000), minus expected withholding. Divide by four for each quarter.

Data source: IRS Form 1040-ES.

Examples

Single, \$90,000, no prior tax

90% of projected tax ÷ 4.

≈ \$2,600 / quarter

Frequently Asked Questions

Generally April 15, June 15, September 15, and January 15 of the following year.

Paying at least 100% of last year's tax (110% if higher income) generally avoids an underpayment penalty even if you owe more.

Recalculate with your updated expected income and adjust the remaining quarterly payments — the annualized installment method can also help.

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Disclaimer

This calculator provides estimates for informational and educational purposes only. SmartTaxCalcs does not provide tax advice. Your actual tax liability may differ based on your specific situation, recent law changes, and circumstances not modeled here (e.g., AMT, NIIT, special credits). We strongly recommend consulting a qualified tax professional (CPA, Enrolled Agent, or tax attorney) before filing or making financial decisions.

Data source: IRS Revenue Procedure / state Departments of Revenue. Last data update: May 19, 2026.

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