Quartli - Quarterly Tax Estimator

Washington Quarterly Estimated Taxes (2026)

Washington has no state income tax - self-employed workers in Washington only owe federal quarterly estimated taxes. You still pay the IRS four times a year (April 15, June 15, September 15, January 15), covering federal income tax and self-employment tax.

Example: freelancer earning $80,000 in Washington

A single filer with $80,000 of net self-employment income in 2026 (standard deduction and a Sec. 199A QBI estimate):

Federal self-employment tax$11,304
Federal income tax$5,344
Federal quarterly payment$4,162

Federal figures computed with official 2026 IRS brackets (Rev. Proc. 2025-32).

2026 quarterly due dates

QuarterIncome periodFederal due date
Q1Jan 1 - Mar 31, 2026April 15, 2026
Q2Apr 1 - May 31, 2026June 15, 2026
Q3Jun 1 - Aug 31, 2026September 15, 2026
Q4Sep 1 - Dec 31, 2026January 15, 2027

Frequently asked questions

Does Washington require quarterly estimated tax payments?

Only at the federal level. Washington has no state income tax on wages or self-employment income, so self-employed residents only make federal quarterly estimated payments to the IRS. Note: Washington has a separate capital gains tax for some high-income investors even though wage and self-employment income are untaxed.

What is the Washington income tax rate for 2026?

Washington has no broad-based state income tax on wage or self-employment income.

When are quarterly estimated taxes due in Washington in 2026?

Federal deadlines apply everywhere: April 15, 2026 (Q1), June 15, 2026 (Q2), September 15, 2026 (Q3), and January 15, 2027 (Q4).

How do I calculate my quarterly taxes as a freelancer in Washington?

Start with the federal side: self-employment tax (15.3% on 92.35% of net earnings) plus federal income tax, divided into four payments. Quartli's free calculator does this instantly using official 2026 IRS figures.

Reviewed by Lena Hanna, CPA · Last updated June 2026 · Federal figures per IRS Rev. Proc. 2025-32. State rules vary by filing status, residency, deductions, credits, and local taxes.

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