1099 · LLC · Self-Employed

Quarterly Tax Calculator

Estimate your quarterly estimated tax payments for federal and state, including safe harbor rules and underpayment penalty thresholds. Educational only.

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New: Quarterly Estimated Tax Safe-Harbor Planner

Our dedicated quarterly planner is live. Estimate your federal tax due, see how much your withholding already covers, get suggested quarterly payments, and check the IRS safe-harbor rule — all in your browser.

Open the Quarterly Planner →

2026 Quarterly Due Dates (federal)

Q1 2026

April 15, 2026

Jan 1 – Mar 31

Q2 2026

June 15, 2026

Apr 1 – May 31

Q3 2026

September 15, 2026

Jun 1 – Aug 31

Q4 2026

January 15, 2027

Sep 1 – Dec 31

Use these calculators for quarterly tax planning

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Self-Employment Tax

SE tax, QBI deduction, and quarterly estimated payments for 1099 and LLC owners.

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LLC Tax Calculator

Self-employment tax, QBI, and sole-prop vs S-Corp comparison with quarterly payments.

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Federal Tax Calculator

Full federal income tax estimate including deductions and OBBBA changes.

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State Tax Estimate

Estimate state income tax — required for state quarterly payments.

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W-2 vs 1099

Understand why 1099 contractors owe quarterly taxes that W-2 employees don't.

📖 Read: How Quarterly Taxes Work for 1099 Workers →

Educational estimates only. Not tax, legal, or financial advice. Quarterly payment rules involve complex safe-harbor calculations. Consult a qualified tax professional before making payment decisions.