Washington's new 9.9% income tax (ESSB 6346) takes effect January 1, 2028. For anyone who works remotely — or who splits time between Washington and another state — the question is immediate: will I owe this tax?
The answer depends on three things: where you're domiciled, where you maintain a home, and where you physically perform your work. Here's how the statute handles each scenario.
(For an overview of ESSB 6346, see Washington's New Income Tax: What Founders, Investors, Athletes, and High Earners Need to Know. For the full tax landscape, see Washington State Taxes.)
How the Statute Defines "Resident"
ESSB 6346 §101(8) creates two independent paths to resident status:
Path 1 — Domicile (with a narrow escape hatch). You're a resident if you're domiciled in Washington during the taxable year — unless you satisfy all three conditions of the 30-day safe harbor:
- (A) You maintained no permanent place of abode in Washington during the entire year;
- (B) You maintained a permanent place of abode outside Washington throughout the entire year; and
- (C) You spent 30 or fewer days in aggregate in Washington during the year.
Miss any one of those three conditions and the safe harbor fails. If you're domiciled in Washington and you still own or lease a home here, you're a resident. Period. It doesn't matter that you spent most of the year in Texas.
Path 2 — Physical presence. Even if you're not domiciled in Washington, you become a resident if you maintained a place of abode in Washington and were physically present for more than 183 days during the year.
A "day" means any portion of a calendar day. Fly into SeaTac at 11:55 PM — that's a day. (See The 30-Day Rule for Washington Income Tax Residency (and Why It's Confusing) for a deeper look at how these tests work in practice.)
Residents: All Income Is Taxed, Regardless of Where You Work
Under §401(1), if you're a Washington resident, all of your income must be allocated to this state. It doesn't matter that your employer is headquartered in San Francisco, or that you spend three weeks a year at the company's New York office. If you're a resident, Washington taxes your entire federal AGI (as modified), subject to the $1 million standard deduction.
This is a critical point for remote workers. Washington does not care where your employer is located. If you live in Seattle and work remotely for a California company, Washington considers all of your income to be Washington income.
But What About the Tax You Pay to California?
This is where §203 comes in. Washington gives residents a credit for income taxes paid to another state on income that's also included in your Washington base income. The credit is the lesser of:
- The tax you actually paid to the other state on that income; or
- The Washington tax that would be due on that income.
So if California taxes you on income sourced there (say, for days you physically worked in their state), you get a dollar-for-dollar credit against your Washington tax — up to the amount Washington would have charged on the same income. You won't be double-taxed on the same dollars.
But there's a catch: California's top rate is 13.3%. Washington's rate is 9.9%. The credit only offsets up to 9.9% — you're still paying the California difference on days you work there. And the credit only applies to income the other state actually taxes. If California doesn't tax your remote work performed from your Seattle home office, there's no credit to claim, and Washington taxes 100% of that income.
Nonresidents: Only Washington-Source Income
If you're not a Washington resident, you're only taxed on income from sources within Washington (§401(2)). For wage earners, "sources within Washington" means compensation from employment performed in the state — regardless of where the employer is located (§403(1)).
The Physical Presence Rule
Section 403 is explicit: wages from a nonresident's employment are allocated to Washington to the extent services are rendered within the state. If services are performed both within and outside Washington, the compensation is apportioned based on the ratio of days worked in Washington to total days worked, or by another reasonable method approved by the Department of Revenue (§403(2)).
This is a physical presence test. Washington did not adopt a "convenience of the employer" rule like New York, which taxes nonresidents on income earned for a New York employer even when the employee works from home in another state. Under ESSB 6346, if you live in Oregon and never set foot in Washington, you owe zero — even if your employer is a Seattle company.
The Five-Day Safe Harbor
Section 401(3) provides a practical safe harbor: if a nonresident individual performs services in Washington for five or fewer days cumulatively in any calendar year, no income from those services needs to be allocated to Washington.
This is a meaningful provision for cross-border workers. If you're an Oregon resident who visits the Seattle office a few times a year for meetings, you're protected — as long as you stay at or under five days.
But be careful. This safe harbor does not apply to professional athletes, student athletes, or nonresident entertainers. And "day" still means any portion of a calendar day.
The Scenarios Remote Workers Actually Face
Scenario 1: Washington Resident, Out-of-State Employer
You live in Seattle. You work remotely for a company based in Austin, Texas.
You're a Washington resident. All of your income is allocated to Washington under §401(1). Texas has no income tax, so there's no credit to claim under §203. Result: if your household income exceeds $1 million, you owe Washington 9.9% on the excess.
Scenario 2: Washington Resident, Working Partly in Another State
You live in Bellevue. You work for a San Francisco company and fly to the office two weeks per month.
Still a Washington resident — all income allocated to Washington. But California will also tax you on income earned during days physically present in California. You claim a §203 credit on your Washington return for the California tax paid on that income. Net result: you pay the higher of the two rates on the overlapping income (California's 13.3%), and Washington's 9.9% on the rest. No double taxation on the same dollars.
Scenario 3: Oregon Resident, Washington Employer
You live in Portland. You work remotely for a Redmond company. You visit the office about once a month.
You're not a Washington resident. Your income is only taxable in Washington to the extent you perform services here (§403). If you visit 12 days per year, your Washington-source compensation is roughly 12/260 (assuming 260 work days) of your total pay — about 4.6%. Only that slice counts toward the $1 million threshold.
As a practical matter, most Oregon-based remote workers for Washington companies won't owe Washington income tax even if their total compensation is high, because the Washington-source portion alone rarely exceeds $1 million. But if you're a senior executive earning $5 million and you're in the Seattle office 60 days a year, the math starts to matter: roughly $1.15 million would be allocated to Washington. (And you'd owe Oregon tax on the rest.)
Scenario 4: Oregon Resident, Occasional Visits Only
You live in Portland. You visit the Seattle office three times a year for planning meetings.
Three days is within the five-day safe harbor (§401(3)). Zero Washington income tax, regardless of your income level.
Scenario 5: You Move Out of Washington Mid-Year
You've been living in Seattle, earning $2 million per year. On July 1, you move to Nevada.
Section 406 controls: you're a part-year resident. Your income is split into the resident portion (all income earned January through June) and the nonresident portion (only Washington-source income earned July through December). If you don't perform any services in Washington after you move, your nonresident portion is zero.
But the $1 million standard deduction is prorated based on the ratio of your Washington base income to your total federal AGI (§315). If your income was evenly distributed, roughly half your total income is Washington base income, so your effective deduction is approximately $500,000. On $1 million of Washington income, you'd owe 9.9% on $500,000 — about $49,500.
Scenario 6: The "Digital Nomad" Who's Still Domiciled Here
You're domiciled in Washington. You travel constantly and work from co-working spaces around the country. You still own a condo in Seattle.
You're a resident. You own a permanent place of abode in Washington, which means the 30-day safe harbor is unavailable to you — even if you only sleep in Seattle for two weeks a year. All of your income is allocated to Washington.
To escape resident status, you'd need to give up your Washington domicile entirely (which is a factual determination involving intent, as discussed in our guide to changing your Washington domicile), sell or terminate the lease on your Washington home, maintain a permanent home elsewhere, and then limit your Washington visits to 30 days or fewer.
What Washington Did Not Do
It's worth noting what's absent from the statute:
No convenience-of-the-employer rule. New York famously taxes nonresidents on income earned for a New York employer even when the employee works remotely from home in New Jersey. Washington rejected this approach. Under §403, nonresident compensation is sourced based on where the services are physically performed, not where the employer is located. This is a significant and deliberate policy choice.
No telecommuting carve-out. Some states have created special rules for pandemic-era remote work arrangements. Washington's statute contains none. The rules are simple: where you physically sit when you do the work is where the income is sourced.
No reciprocal agreements (yet). Section 203(2) authorizes the Department of Revenue to enter reciprocal agreements with other states exempting each other's residents from tax on personal service income. As of now, no such agreements exist. Oregon does not currently exempt Washington residents from Oregon income tax on days they work in Oregon, and vice versa. This could change — but don't count on it.
What This Means for Employers
Section 403(3)(b) defines "employment" broadly — it includes personal service performed under any legal relationship where the employer is subject to unemployment taxes under RCW 50.24.010. This means the sourcing rules apply to independent contractors performing services in Washington, not just W-2 employees.
Employers with remote workers scattered across state lines will need to track days worked in Washington for employees earning above the threshold. Section 404 also requires entities that pay wages or bonuses to professional athletic team members in Washington to file annual reports — but the broader principle extends conceptually: if you're paying people who sometimes work from Washington, the allocation question is real.
Planning Takeaways
If you're a Washington resident working remotely for an out-of-state company: your income is taxed by Washington. Claim credits for any income tax paid to states where you physically work.
If you live in another state and work for a Washington company: only your days physically present in Washington matter. Stay at or under five days per year and you're completely protected.
If you're thinking about leaving Washington: the 30-day safe harbor is brutally narrow. You must give up your home here, maintain a home elsewhere, and never spend more than 30 days in the state. Moving your domicile alone isn't enough if you keep a place of abode in Washington. (Read The 30-Day Rule for Washington Income Tax Residency for the full breakdown.)
If you split time between states: start tracking your days now. The statute takes effect January 1, 2028, but building the habit and documentation practice before then will save you significant headaches. A calendar log showing which state you were in each day, supported by travel records, is the single most important piece of evidence in any residency or sourcing dispute.
Need help assessing how Washington's income tax will apply to your specific work arrangement? Book a 20-minute intro call to discuss your situation. Also see: Washington State Taxes Guide | Income Tax Planning Guide for High Earners
