If your only Washington income is wages or salary, you do not need to file a state tax return. Washington has no personal income tax, so there is no state form for your W-2 earnings. You may still need to file separately with the Washington Department of Revenue if you run a business, sold investments at a large gain, want to claim the Working Families Tax Credit, bought taxable goods from an out-of-state seller, or are settling an estate above the state threshold.
Wages and Salary: No State Return
Washington is one of a small number of states with no individual or corporate income tax.1Washington Department of Revenue. Income Tax The state constitution treats income as property, and property taxes have to be uniform and capped at a low rate. That has blocked every attempt to create a graduated tax on earnings. Your paycheck is still subject to federal income tax and to two state payroll deductions covered further down, but you will never send a state income tax form to Olympia based on your salary.
Everything below is about the separate filings that do exist. Whether any of them apply depends on what else is going on in your financial life.
If You Run a Business: The B&O Tax
If you operate a business in Washington, even as a freelancer or sole proprietor, the Business and Occupation tax is likely your main state filing obligation. B&O is a gross receipts tax. It applies to your total revenue before any deductions for expenses, materials, or labor, and you owe it whether or not you turned 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. Most freelancers, consultants, and professional service providers fall here.
- 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 your 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 Filing frequency depends on volume: high-revenue businesses file monthly, mid-range businesses file quarterly, and smaller operations file 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 tax. Seattle, Tacoma, and Bellevue are among them. A Seattle-based consultant, for example, owes the 1.5% state rate plus a separate city rate of 0.658% on the same gross receipts for 2026 through 2032.5City of Seattle. Tax Rates and Classifications If you operate inside a Washington city, check whether that city has its own B&O registration and filing.
If You Sold Investments: The Capital Gains 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 classifies this as an excise tax rather than an income tax, given the constitutional bar on taxing income.
Most people never file. A standard deduction shields all gains below it. 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, a second tier applies: the first $1 million in taxable gains is taxed at 7%, and anything above $1 million is taxed at 9.9%.7Washington Department of Revenue. New Tiered Rates for Washingtons Capital Gains Tax
Several categories are excluded entirely. Gains from selling real estate, including your home, are exempt. Assets held in IRAs, 401(k)s, and similar tax-deferred accounts are not subject to the tax. Sales of qualified family-owned small businesses are also exempt.6Washington Department of Revenue. Capital Gains Tax
The return is normally due April 15, alongside your federal return. You can request an extension through the Department’s My DOR portal by April 15, but an extension only delays the filing, not the payment. You still have to estimate and pay by the original due date.6Washington Department of Revenue. Capital Gains Tax For 2025 returns, the Department has extended the due date to May 1, 2026, matching a federal extension for Washington residents affected by severe storms in late 2025.
If You Qualify: The Working Families Tax Credit
The Working Families Tax Credit is a refundable state credit for low-to-moderate-income residents, and claiming it requires its own application with the Department of Revenue. There is no other Washington return this attaches to. If you don’t apply, you don’t get it.
For tax year 2025, the credit ranges from a $50 minimum 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 for 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 already qualify for the federal EITC, applying for the state credit is worth the few minutes it takes.
If You Bought From an Out-of-State Seller: Use Tax
Use tax fills the gap left when a seller doesn’t collect Washington sales tax. When you buy something from an out-of-state seller who doesn’t charge Washington sales tax, you owe use tax at the same combined state and local rate that would have applied to a local purchase. The state portion is 6.5%, and local rates vary.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 through the My DOR portal or by mailing a Consumer Use Tax Return.9Washington Department of Revenue. Use Tax For vehicles, the Department of Licensing collects the tax when you register or title, so no separate filing is needed. For other purchases, self-reporting is on you.
If You’re Settling an Estate: The Estate Tax
Washington imposes its own estate tax, and it kicks in at a much lower value than the federal exemption. For deaths occurring in 2026, the filing threshold is $3,076,000 based on the gross estate.10Washington Department of Revenue. Estate Tax Tables Estates below that value owe nothing and don’t file. Above it, graduated rates apply, running from 10% on the first $1 million of taxable value up to a top rate of 35% on amounts over $9 million.11Washington State Legislature. RCW 83.100.040 – Estate Tax Imposed Amount of Tax The top rate took effect July 1, 2025.
Many estates that owe nothing federally still owe Washington estate tax because the state threshold sits far below the federal exemption. The executor or personal representative files, not the individual beneficiaries.
Payroll Deductions That Don’t Require a Filing
Two state programs come out of your paycheck automatically, but neither generates a return for you to file. They reduce your take-home pay and are worth knowing about, though you don’t do anything on April 15 with them.
Paid Family and Medical Leave provides partial wage replacement for a serious health condition, a new child, or a family member’s military deployment. For 2026, the premium rate is 1.13% of gross wages, with employees paying 71.43% of that and employers covering the rest.12Employment Security Department Washington State. Paid Family and Medical Leave Premium Rate Increases to 1.13% in 2026 On a $60,000 salary, the employee share works out to roughly $484 per year. Employers with fewer than 50 employees don’t owe the employer share but still withhold the employee portion.
The WA Cares Fund is a long-term care insurance program funded entirely by a 0.58% employee payroll deduction. On a $60,000 salary, that runs about $348 per year. All full-time, part-time, and temporary workers in Washington contribute unless they have an approved exemption.13WA Cares Fund. How the Fund Works
What Happens If You Miss a Filing
Washington’s late-payment penalty structure escalates fast. For B&O and other excise taxes, the penalty is 9% if the tax isn’t paid by the due date, 19% if it remains unpaid by the end of the following month, and 29% after two months. The minimum penalty is $5.14Legal 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 The capital gains tax follows the same penalty rules.
If you realize you have unfiled returns, contacting the Department of Revenue before it contacts you is almost always the better move. Washington does not publish a formal voluntary disclosure program for individuals the way some other states do, but coming forward first can sometimes result in waived penalties.