Quarterly Tax Calculator
Calculate your quarterly estimated tax payments with all four due dates and safe harbor amounts to avoid penalties.
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Annual Tax Estimate
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Safe Harbor Amount
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Quarterly Schedule
Estimate only. Quarterly estimated taxes are based on expected annual income. Actual amounts may differ. Always pay at least the safe harbor amount to avoid underpayment penalties.
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Quarterly Estimated Tax Guide
If you are self-employed, a freelancer, or earn significant non-withheld income, the IRS requires quarterly estimated tax payments. Missing or underpaying these installments results in an underpayment penalty — even if you pay everything you owe by April 15. Use with our self-employment tax calculator for a complete picture.
- Four due dates — not calendar quarters. Estimated tax payments are due April 15 (Q1), June 15 (Q2), September 15 (Q3), and January 15 (Q4 of prior year). Q1 and Q2 are only 2–3 months apart — many new freelancers miss the June deadline.
- The safe harbor rule protects you from penalties. Pay at least 100% of last year's tax liability (110% if your prior year AGI exceeded $150,000) and you are protected from underpayment penalties regardless of how much you owe at filing. This is the safer approach when income is unpredictable.
- You can adjust payments if income changes. Each quarterly payment can be adjusted based on your actual year-to-date income. If Q1 was unexpectedly low, you can reduce Q2 accordingly. The IRS annualizes income to calculate the penalty — paying more in good quarters protects you.
- State estimated taxes are separate. Most states also require quarterly estimated tax payments if you expect to owe more than $500–$1,000 at filing. Check your state's department of revenue for due dates and forms — they often mirror the federal schedule but not always.
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Frequently Asked Questions
Generally, you must make quarterly estimated payments if you expect to owe at least $1,000 in federal taxes after withholding and credits. This applies to self-employed individuals, freelancers, sole proprietors, partners in partnerships, and anyone with significant non-withheld income like rental income or large investment gains.
Q1 (Jan 1–Mar 31): April 15. Q2 (Apr 1–May 31): June 15. Q3 (Jun 1–Aug 31): September 15. Q4 (Sep 1–Dec 31): January 15 of the following year. If a due date falls on a weekend or holiday, it moves to the next business day. These dates apply to federal payments — state due dates may vary.
The safe harbor rule protects you from underpayment penalties if you pay at least 100% of your prior year tax liability through estimated payments (110% if your prior year AGI was over $150,000). This is the safest approach when your income is variable — pay based on last year regardless of this year's income.
Missing or underpaying a quarterly estimate results in an underpayment penalty calculated at the federal short-term interest rate plus 3 percentage points, applied to the underpaid amount for the number of days it was underpaid. The penalty is typically small but accumulates through the filing date. Use Form 2210 to calculate the exact penalty.
Yes. The IRS Direct Pay system allows free electronic payments from your bank account at IRS.gov/payments. You can also pay via the IRS2Go mobile app, EFTPS (Electronic Federal Tax Payment System), or by mailing Form 1040-ES with a check. EFTPS is recommended for consistent quarterly payers — it allows you to schedule payments in advance.