Washington does not have a personal income tax, so there is no annual Washington state tax return for wages or salary the way there is a federal 1040. You only file something with the state if one of a few specific situations applies to you: you had large long-term capital gains, you qualify for the Working Families Tax Credit refund, you run a business subject to the Business and Occupation tax, or you are handling an estate above the state threshold. Everything else that looks like a “tax return” in Washington is really a federal obligation you send to the IRS.
No Return for Wages or Salary
Washington has no individual or corporate income tax. Your pay, tips, and interest are not taxed by the state, and your employer does not withhold state income tax from your check.1Washington Department of Revenue. Income Tax That rule applies to residents and to non-residents earning money in Washington. You still file a federal return with the IRS, but the state itself does not want one.
The state funds itself through sales taxes, business taxes, property taxes, and excise taxes instead. The base sales tax rate is 6.5%, with local add-ons pushing the combined rate anywhere from about 7.7% to 10.6%.2Washington Department of Revenue. Local Sales and Use Tax Rate Table So for most residents, the answer to “do I file a state return” is simply no.
The sections below cover the situations where the answer flips to yes.
Capital Gains Excise Tax Return
Since 2022, Washington has taxed the sale or exchange of long-term capital assets like stocks, bonds, and business interests. The tax is structured as an excise, not an income tax, and the Washington Supreme Court upheld it on that basis in Quinn v. State.3Washington State Courts. Quinn v State
You only owe this tax, and only need to file the return, if your long-term gains for the year exceed a standard deduction of $250,000. That figure is adjusted upward for inflation each year, and the Department of Revenue posts the current number on its website each filing season.4Washington State Legislature. Washington State Code 82.87 – Capital Gains Tax
Starting with the 2025 tax year, the rate is tiered. The first $1,000,000 of taxable gains is taxed at 7%. Anything above $1,000,000 is taxed at 9.9%.5Washington State Legislature. RCW 82.87.040 – Tax Imposed, Long-term Capital Assets The additional 2.9% top tier was added by the legislature in 2025.6Washington Department of Revenue. New Tiered Rates for Washingtons Capital Gains Tax
Several asset categories are completely exempt, and the biggest one is real estate. Selling your house or an investment property does not count toward your capital gains total at all. Other exempt categories include gains inside retirement accounts (IRAs, 401(k)s), depreciable business assets, timber and timberlands, livestock tied to farming or ranching, commercial fishing privileges, and proceeds from condemnation.7Washington Department of Revenue. Capital Gains Tax There is also a deduction for the sale of a qualified family-owned small business and a separate deduction for very large charitable donations.8Washington State Legislature. Washington State Code 82.87 – Capital Gains Tax, Full Chapter
You file through the Department of Revenue’s My DOR portal, using your federal Form 1040 and Schedule D to transfer gain figures into the state form.4Washington State Legislature. Washington State Code 82.87 – Capital Gains Tax For the 2025 tax year, the return and payment are both due May 1, 2026. You can request a filing extension, but the extension does not push back the payment deadline. Late payments accrue interest and penalties, so if you know you owe but haven’t finalized the amount, submit an estimated payment by May 1.9Washington Department of Revenue. Capital Gains Excise Tax Returns Due Date Moved to May 1, 2026
Working Families Tax Credit Application
The Working Families Tax Credit is a cash refund the state sends you, not a reduction in taxes owed. It is designed to offset the sales tax burden on lower-income households.10Washington State Legislature. RCW 82.08.0206 – Working Families Tax Credit It is not filed as part of a traditional return; it is a separate application through My DOR.
To qualify, you must have lived in Washington for more than 180 days during the tax year, have filed a federal income tax return, and be eligible for the federal Earned Income Tax Credit, or meet those same requirements but file with an ITIN instead of a Social Security number.11Washington Department of Revenue. Working Families Tax Credit Application Window Opens Feb. 1 The ITIN option is a significant expansion over the federal EITC, which does not allow it. Adults without qualifying children must be at least 25 and under 65.
Maximum refund amounts for the 2025 tax year (filed in 2026) range by household size:11Washington Department of Revenue. Working Families Tax Credit Application Window Opens Feb. 1
- No qualifying children: up to $335 (single income limit $19,104; joint $26,214)
- One child: up to $660 (single $50,434; joint $57,554)
- Two children: up to $995 (single $57,310; joint $64,430)
- Three or more children: up to $1,330 (single $61,555; joint $68,675)
The 2025 application window opened February 1, 2026 and stays open through December 31, 2029.12Washington Department of Revenue. Working Families Tax Credit Application Window Opens Feb. 1 There is no rush, but filing earlier means getting the refund sooner.
Business and Occupation Tax Return
If you run a business in Washington, the Business and Occupation (B&O) tax is your main state filing. It is a gross receipts tax, so you owe on total revenue before any deduction for expenses, payroll, or cost of goods.13Washington Department of Revenue. Business and Occupation Tax
The rate depends on your activity:14Washington Department of Revenue. Business and Occupation (B&O) Tax
- Retailing: 0.471%
- Wholesaling: 0.484%
- Manufacturing: 0.484%
- Service and other activities: 1.5%
The service rate is roughly three times the retailing rate, which often catches freelancers and consultants off guard. If your business falls under more than one classification, you report each portion of income at its own rate.
Filing frequency depends on how much you take in. Most small businesses under $60,000 in annual revenue file once a year; higher-revenue businesses file quarterly or monthly. Annual returns are due April 15, quarterly returns by the end of the month after the quarter closes, and monthly returns by the 25th of the following month.15Washington Department of Revenue. Filing Frequencies and Due Dates
A small business B&O credit can reduce or eliminate what you owe at low liability levels. For businesses where less than half of income comes from service activities, the annual credit applies when total B&O liability is under $1,320; for service-heavy businesses the annual threshold is $3,840.16Washington Department of Revenue. Credits Many very small operations end up owing nothing after the credit, but they still file.
Estate Tax Return
Washington is one of a handful of states with its own estate tax, and the filing threshold is far lower than the federal one. For deaths occurring in 2026, estates with a gross value above $3,076,000 must file a Washington estate tax return.17Washington Department of Revenue. Estate Tax Tables The federal exemption is over $13 million, so plenty of estates that owe nothing to the IRS still owe Washington.
The threshold is based on gross estate, not net estate after debts, so some estates that end up owing little still have to file. Rates on the taxable portion are graduated from 10% on the first $1,000,000 above the exclusion up to 35% on amounts over $9,000,000.17Washington Department of Revenue. Estate Tax Tables The return is due nine months after the date of death, and a timely extension request adds six months.18Washington Department of Revenue. Estate Tax FAQ
Where to File: My DOR
Everything above runs through the Department of Revenue’s My DOR online portal. You create an account, link your taxpayer identification, and pick the return or application you need. Capital gains returns, B&O returns, and the Working Families Tax Credit application all live in the same system.
For the capital gains return, have your Social Security Number or ITIN, your federal Form 1040, Schedule D, and detailed records of every asset sale (purchase date, sale date, cost basis) organized before you start. Mismatches between your state and federal reporting are one of the fastest ways to trigger a review. The portal accepts electronic funds transfer and other approved digital payment methods, and it generates a confirmation notice you should save.
For the Working Families Tax Credit, you upload supporting documents confirming residency, income, and qualifying children rather than filing a traditional return. Processing times vary, and filing early in the window tends to produce faster refunds.