2026 Quarterly Tax Calculator — Form 1040-ES Safe Harbor | DoUrWork
Calculate quarterly estimated tax payments for 2026 (IRS Form 1040-ES). Avoid penalties using the 100%/110% safe harbor rule. Free on-device tool.
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How to Use the Quarterly Taxes
Enter Expected Annual Net Income
Input estimated total self-employment profit for the current tax year.
Select Safe Harbor Method
Choose between current year estimate or prior year safe harbor threshold.
View Voucher Schedule
Get exact payment amounts due for each of the four IRS quarterly deadlines.
Frequently Asked Questions
When are IRS quarterly estimated tax payments due in 2026?
The standard quarterly payment deadlines for tax year 2026 are: Q1 (April 15, 2026), Q2 (June 15, 2026), Q3 (September 15, 2026), and Q4 (January 15, 2027).
What is the IRS safe harbor rule for estimated taxes?
Under IRS Publication 505, you avoid underpayment penalties if you pay either 90% of your current year tax liability or 100% of your prior year tax liability (increased to 110% if your prior year Adjusted Gross Income exceeded $150,000, or $75,000 if married filing separately). Estimated vouchers cover federal taxes; state obligations are paid separately.