Washington Estimated Tax Deadlines — 2026
2026 estimated tax payment deadlines for each quarter. Avoid penalties by filing on time.
Washington residents who work for themselves face a unique combination of federal and state tax obligations. This page provides state-specific guidance for estimated tax deadlines in Washington for the 2026 tax year, drawing on IRS publications and Washington tax authority data.
Washington is one of only nine states with no state income tax, which significantly reduces the total tax burden for self-employed individuals. Residents of Washington only owe federal self-employment tax and federal income tax on their business profits. Forming an LLC in Washington costs $200 in state filing fees. LLCs in Washington must pay an annual report fee of $60. The state sales tax rate in Washington is 7%, which applies to most business purchases and sales of taxable goods. Quarterly estimated tax payments are due April 15, June 16, September 15, and January 15 in Washington. Understanding these obligations before you file prevents penalties and identifies legitimate savings opportunities.
Quick Washington Tax Estimate
Based on Washington's tax rates for 2026. Sample calculation for $80,000 net profit.
Washington Tax Facts — 2026
How to Use This Calculator
Review the Washington-specific information on this page, then use the linked calculators to compute your personalized estimates. Enter your income and expenses, select Washington, and review your results. Cross-check key figures against the official Washington tax authority website linked in the resources section.
Why Getting This Right Matters
Tax mistakes cost Washington self-employed individuals real money — penalties, interest, and missed deductions. Accurate state-specific guidance means paying exactly what you owe, claiming every deduction available, and avoiding costly surprises. The 8% IRS underpayment rate plus Washington state penalties make accuracy a financial necessity.