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 Estimated Tax Calculator
Calculate your IRS quarterly payment to avoid underpayment penalties
Safe Harbor Tip: Pay 100% of last year's total tax (110% if AGI > $150K) divided by 4 to avoid any underpayment penalty.
Uses 2026 IRS brackets and standard deduction ($16,100 single / $32,200 MFJ). SE tax is only on freelance income. The 50% SE tax deduction has been applied before calculating federal income tax. Does not include state taxes or QBI deduction. Consult a tax professional.
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.