In most cases, no — Washington has no personal income tax, so you do not file a state return on your wages or salary. The question of whether you need to file state taxes in Washington turns on what else is going on in your financial life: running a business, selling investments at a large gain, buying things out of state, qualifying for a refundable credit, or settling an estate can each trigger a separate filing with the Washington Department of Revenue.
No Return for Wages or Salary
Washington is one of a small number of states with no individual or corporate income tax.1Washington Department of Revenue. Income Tax If your income is a paycheck from a Washington employer, you will never send a state income tax form to Olympia. Your W-2 wages are still subject to federal income tax and to two mandatory state payroll deductions, but those deductions are withheld automatically and do not require a return from you.
When You Do Need to File Something
You have a Washington filing obligation if any of the following apply:
- You run a business, including a one-person consulting or freelance operation, with gross receipts sourced to Washington over $100,000.
- You had long-term capital gains above the annual deduction (currently $278,000 for tax year 2025).
- You bought taxable goods from an out-of-state seller who did not charge Washington sales tax.
- You qualified for the federal Earned Income Tax Credit and want to claim the state’s Working Families Tax Credit.
- You are the executor of an estate worth more than $3,076,000 for 2026 deaths.
Each of these has its own form, deadline, and rules. The sections below walk through them.
Business and Occupation Tax
If you run any kind of business in Washington, the Business and Occupation (B&O) tax is likely your main state filing. It is a gross receipts tax, meaning it applies to total revenue before expenses, so you owe it whether or not you turn a profit.2Washington Department of Revenue. Business and Occupation Tax
Rates depend on how your activity is classified:3Washington Department of Revenue. Business and Occupation (B&O) Tax
- Service and other activities: 1.5% of gross receipts. This covers most freelancers, consultants, and professional services.
- Retailing: 0.471% of gross receipts. Retailers also collect and remit sales tax.
- Wholesaling: 0.484% of gross receipts.
You must register with the Department of Revenue once gross receipts sourced to Washington exceed $100,000 in the current or prior year.4Washington Department of Revenue. Out of State Businesses Reporting Thresholds and Nexus High-volume businesses file monthly, mid-range quarterly, and smaller operations annually. Annual returns are due April 15.2Washington Department of Revenue. Business and Occupation Tax
Several Washington cities layer their own B&O tax on top of the state’s. Seattle, for example, applies a local rate of 0.658% on service activities and 0.342% on retailing and wholesaling for 2026 through 2032.5City of Seattle. Tax Rates and Classifications A Seattle consultant therefore owes 1.5% to the state plus 0.658% to the city on the same gross receipts. Tacoma, Bellevue, and other cities impose their own versions. Check your city’s rules for a separate registration.
Capital Gains Excise Tax
Washington imposes a 7% excise tax on the sale or exchange of long-term capital assets like stocks, bonds, and business interests.6Washington Department of Revenue. Capital Gains Tax The legislature classified it as an excise tax rather than an income tax.
A large standard deduction keeps most people out of the tax entirely. For tax year 2025 the deduction is $278,000 per individual or married couple, adjusted annually for inflation.6Washington Department of Revenue. Capital Gains Tax Only gains above that threshold are taxable. Starting with tax year 2025, the first $1 million of taxable gains is taxed at 7% and anything above $1 million at 9.9%.7Washington Department of Revenue. New Tiered Rates for Washingtons Capital Gains Tax
Several categories of gains are excluded entirely:
- Gains from selling your home or other real property.
- Assets held in IRAs, 401(k)s, and similar tax-deferred accounts.
- Gains from selling all or substantially all of a qualifying family-owned small business.6Washington Department of Revenue. Capital Gains Tax
The return is normally due April 15. You can request an extension through the My DOR portal by that date, but the extension delays only the filing, not the payment; you must estimate and pay what you owe by the original due date.6Washington Department of Revenue. Capital Gains Tax For 2025 returns specifically, the Department of Revenue extended the due date to May 1, 2026, to match a federal extension for Washington residents affected by severe storms in late 2025.
Working Families Tax Credit
The Working Families Tax Credit is a refundable state credit for low-to-moderate-income residents. It requires its own application with the Department of Revenue, and that application is the only way to receive the money.
For tax year 2025, the credit ranges from a minimum of $50 up to a maximum that depends on family size:8Department of Revenue, Washington State. Eligibility – Washington State Working Families Tax Credit
- No qualifying children: up to $335
- One qualifying child: up to $660
- Two qualifying children: up to $995
- Three or more qualifying children: up to $1,330
To qualify, you must have lived in Washington at least 183 days during the tax year, filed a federal return, and met the requirements for the federal Earned Income Tax Credit.8Department of Revenue, Washington State. Eligibility – Washington State Working Families Tax Credit If you qualify for the federal EITC and skip the state application, the refund is simply left unclaimed.
Use Tax
Use tax fills a gap in the sales tax system. When you buy something from an out-of-state seller who does not collect Washington sales tax, you owe use tax at the same combined state and local rate that would have applied locally. The state portion is 6.5%, with local rates varying by location.9Washington Department of Revenue. Use Tax
The most common triggers are purchases from a state with no sales tax, like Oregon, and private-party vehicle sales. You can report and pay online through My DOR or by mailing a Consumer Use Tax Return.9Washington Department of Revenue. Use Tax For vehicles, the Department of Licensing collects use tax when you register or title the vehicle, so no separate filing is needed in that case. For other purchases, the obligation to self-report is on you.
Estate Tax
Washington imposes its own estate tax with a far lower filing threshold than the federal one. For deaths occurring in 2026, a return is required when the gross estate exceeds $3,076,000.10Washington Department of Revenue. Estate Tax Tables Graduated rates run from 10% at the bottom up to a top rate of 35%, which took effect July 1, 2025.11Washington State Legislature. RCW 83.100.040 – Estate Tax Imposed Amount of Tax Many estates that owe nothing federally still owe Washington estate tax. The executor or personal representative files the return, not the individual beneficiaries.
Payroll Deductions Are Not Filings
Two mandatory state programs reduce every Washington paycheck, but neither requires a return from you. Paid Family and Medical Leave carries a 2026 premium rate of 1.13% of gross wages, with employees paying 71.43% of that premium and employers covering the rest.12Employment Security Department Washington State. Paid Family and Medical Leave Premium Rate Increases to 1.13% in 2026 The WA Cares Fund takes 0.58% of wages, entirely from the employee, to fund a long-term care benefit that becomes available statewide on July 1, 2026.13WA Cares Fund. How the Fund Works Both show up on your paystub; neither sends you to a form.
If You Miss a Filing
Washington’s late payment penalties for B&O and other excise taxes escalate in steps: 9% if the tax is not paid by the due date, 19% if it remains unpaid by the end of the following month, and 29% if it is still outstanding after two months, with a $5 minimum.14Legal Information Institute. Washington Administrative Code 458-20-228 Unpaid balances also accrue interest at 6% annually for 2026.15Washington Department of Revenue. Interest Rate Tables If you discover an unfiled return, contacting the Department of Revenue before they contact you is almost always the better move. Washington does not publish a formal voluntary disclosure program for individuals, but coming forward early can sometimes result in waived penalties.