Quarterly Tax Deadline Calculator
Missed a quarterly deadline? This calculator shows if you owe penalties, how much they are, and exactly when your next payment is due. Never miss a quarterly deadline again.
Quarterly Tax Deadline Calculator
Track the four IRS estimated tax due dates and plan your payments
Rule: Pay at least 90% of this year's tax OR 100% of last year's tax (110% if your AGI exceeded $150,000) through four equal installments to avoid the IRS underpayment penalty. Miss a deadline and the penalty applies even if you overpay later.
Deadlines assume the standard schedule: Q1 by April 15, Q2 by June 15, Q3 by September 15, Q4 by January 15 of the next year. When a date falls on a weekend, the deadline moves to the next business day (federal holidays are not accounted for). IRS Form 1040-ES and Form 2210 cover estimated payments and penalty calculations. Consult a tax professional for your situation.
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Frequently Asked Questions
What are the 2026 quarterly tax deadlines?+
Q1 (income Jan 1–Mar 31): April 15, 2026. Q2 (income Apr 1–May 31): June 15, 2026. Q3 (income Jun 1–Aug 31): September 15, 2026. Q4 (income Sep 1–Dec 31): January 15, 2027. If a deadline falls on a weekend or holiday, it's pushed to the next business day.
How is the IRS underpayment penalty calculated?+
The penalty is based on how much you underpaid, for how long, and the quarterly interest rate set by the IRS (typically 7-8% in recent years). The IRS uses Form 2210 to calculate it. Even small underpayments can result in penalties if the shortfall is large and long-standing.
Can I avoid quarterly tax penalties?+
Yes. Pay at least 90% of your current year tax liability OR 100% of last year's total tax (110% if AGI > $150,000) through quarterly payments. You can also use the annualized income installment method if your income is uneven throughout the year.
What are the 2026 quarterly tax deadlines?
Q1 (income Jan 1–Mar 31): April 15, 2026. Q2 (income Apr 1–May 31): June 15, 2026. Q3 (income Jun 1–Aug 31): September 15, 2026. Q4 (income Sep 1–Dec 31): January 15, 2027. If a deadline falls on a weekend or holiday, it's pushed to the next business day.
📖 Free guide
Quarterly Estimated Taxes 2026: Deadlines, Safe Harbor, and How to Never Miss a Payment
Freelancers must pay estimated taxes four times a year. Here are the exact 2026 quarterly deadlines, how to calculate each payment, the safe harbor rule that protects you from underpayment penalties, and a simple system for never missing a due date again.
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