Quarterly Tax Estimator
2026 Tax Year
Calculate your quarterly estimated tax payments to avoid underpayment penalties. Uses safe harbor rules to determine the minimum required payments.
Filing Status
Income Type
Deductible business expenses reduce your taxable income
Tax Withholding & Prior Year
Enter 0 if you're fully self-employed with no W-2 withholding
Find this on Line 24 of your 2024 Form 1040 (total tax)
2026 Due Dates
Q1 2026
Jan 1 - Mar 31
$3,750
April 15, 2026
Q2 2026
Apr 1 - May 31
$3,750
June 15, 2026
Q3 2026
Jun 1 - Aug 31
$3,750
September 15, 2026
Q4 2026
Sep 1 - Dec 31
$3,750
January 15, 2027
Tax Summary
Safe Harbor
Stay Organized
iFileTax tracks your quarterly payments and reminds you before deadlines.
Freelancer Tax HubUnderstanding Safe Harbor Rules
What is Safe Harbor?
Safe harbor is an IRS rule that helps you avoid underpayment penalties. If you pay at least the "safe harbor" amount through withholding or estimated payments, you won't be penalized even if you owe more when you file.
The Two Options
- 100% of prior year: Pay what you owed last year (110% if AGI > $150k)
- 90% of current year: Pay 90% of what you'll owe this year
Pro Tips
- 1.If your income is variable, using 100% of prior year is often safer
- 2.You can make uneven payments based on when you earn income
- 3.Consider opening a separate savings account for tax payments
- 4.Set aside 25-30% of each payment you receive for taxes
Disclaimer
This calculator provides estimates based on 2025 tax rates and the standard deduction. It does not account for all possible deductions, credits, or tax situations. State estimated taxes are not included. Consult a tax professional for personalized advice.