Quarterly Estimated Tax Calculator
Free quarterly estimated tax calculator for self-employed and 1099 workers. See your required IRS Form 1040-ES payment and safe-harbor amount for each due date.
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Adjust values to see instant results
Additional Details
Required Payment Per Quarter
Estimated • Based on your inputs
Safe-Harbor Annual Target
$12,000.00
Detailed Breakdown
Disclaimer: This calculator provides estimates for informational purposes only. Results should not be considered financial, tax, or legal advice. Consult a qualified professional for your specific situation.
How This Calculator Works
Calculation methodology and assumptions
Self-employed taxpayers who expect to owe $1,000 or more generally must pay estimated tax quarterly via IRS Form 1040-ES. This calculator estimates your current-year federal tax (self-employment tax plus income tax on self-employment and other income, after the standard deduction and the 50% self-employment-tax deduction), then applies the IRS safe-harbor rule: the simplified annual target is the LESSER of 90% of this year's total tax or 100% of last year's tax (110% if last year's AGI exceeded $150,000). The safe-harbor annual target, minus any tax already withheld or paid, is divided across the four IRS payment periods (due April 15, June 15, September 15, and January 15 of the following year).
Budget 2026 estimated federal payments
- 1
Enter expected full-year income
Use net self-employment income and other taxable income separately. Select single or married filing jointly; this model does not cover every filing status or household wage interaction.
- 2
Use the prior return
Enter prior-year total tax and AGI, not a prior refund, balance due or gross business receipts.
- 3
Reconcile amounts already covered
The tool subtracts entered withholding or payments from an annual target and divides the remaining amount by four. It does not track installment dates or allocate past payments to the right period.
Read the inputs and reconcile the outputs
Place the prior federal return beside your current-year income estimate. Reconcile the form’s already-covered amount with your records before interpreting a remaining-payment result.
The 2026 model estimates income and SE tax, compares its current-year percentage target with the prior-year target where entered, and divides the remaining annual amount into four equal budgeting amounts.
Result: A displayed safe-harbor target is conditional on the legal requirements, prior-return eligibility and timely installment payments. It does not guarantee freedom from penalties; use Form 1040-ES and Form 2210 for uneven income, payment timing and exceptions. State estimates are separate.
What changes this estimate
Prior-year eligibility
A valid prior-year safe harbor requires the relevant prior-year return conditions; a zero input alone does not establish eligibility.
Timing
Late or uneven payments can produce a penalty even when the final annual total meets a target.
Limits and checks before acting
- Do not treat a four-way annual division as the amount required on every remaining due date.
- This simplified estimate omits QBI, credits, itemized deductions and full wage-base coordination.
- Recheck the annual estimate when income changes and use official payment-period rules.
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StateCalc Team
Editorial Team
The StateCalc team builds free financial calculators using data from official government sources including the IRS, U.S. Census Bureau, BLS, and state revenue departments. All formulas are validated by an automated test suite and cross-referenced against published data.
Our editorial standardsFrequently Asked Questions
Who has to pay quarterly estimated taxes?
Individuals, including sole proprietors, partners, and S-Corp shareholders, generally must make quarterly estimated tax payments if they expect to owe $1,000 or more in tax for the year after subtracting withholding and refundable credits, per IRS guidance. Most freelancers, 1099 contractors, and small business owners without an employer withholding taxes for them fall into this category.
What is the safe harbor rule for estimated taxes?
Subject to the applicable prior-return eligibility, installment-timing and other IRS requirements, the annual safe-harbor comparison uses the lesser of 90% of the current year's total tax or 100% of last year's total tax. If your prior-year adjusted gross income was over $150,000, the prior-year threshold rises to 110% instead of 100%.
When are quarterly estimated tax payments due?
The four IRS payment periods for a given tax year are due April 15, June 15, September 15, and January 15 of the following year. If a due date falls on a weekend or legal holiday, the deadline shifts to the next business day.
What happens if I underpay my estimated taxes?
The IRS can charge an underpayment penalty (calculated similarly to interest) on the shortfall for each period you underpaid, even if you are due a refund once you file your return. Recalculating your estimated payments each quarter as your income changes — using this calculator or the Form 1040-ES worksheet — helps you update a planning budget; it does not determine installment penalties or guarantee a penalty exemption.
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