What actually happens
An employee who lives in Oregon and performs work in Washington sits in two tax systems at once. The residence state claims the right to tax all of a resident's income wherever earned; the work state claims the right to tax income sourced within its borders. Absent an agreement, both claims stand, and the conflict is resolved after the fact through a credit on the resident return rather than up front in payroll.
Unemployment insurance goes to one state only
Income tax can be split between states. Unemployment insurance cannot. Under the localization test used by every state, an employee whose services are performed entirely in Washington is covered by Washington for unemployment purposes, and all wages are reported there — regardless of where they live, where you are headquartered, or which state's income tax you withhold. Washington's 2026 taxable wage base is $78,200. The four-factor test in order.
Local taxes are a separate problem
Oregon: Oregon has multiple employee-withheld local taxes: the Multnomah County Preschool for All personal income tax, the Metro Supportive Housing Services personal income tax, the Eugene Community Safety Payroll Tax, and the statewide transit tax (0.1% of wages). TriMet and Lane Transit District payroll taxes are employer-paid. Oregon also has the state Paid Leave Oregon employee contribution.
What you have to register for
| Obligation | State | Agency |
|---|---|---|
| Income tax withholding | Oregon | Oregon Department of Revenue |
| Unemployment insurance | Washington | Washington State Employment Security Department (ESD) |
| Paid family & medical leave | Washington | Washington PFML total premium rose to 1.13% for 2026 (from 0.92%) on wages up to $184,500. Employees pay 71.43% of the premium (about 0.8072% of wages) and employers with 50+ employees pay 28.57%. Separately, the WA Cares Fund long-term care premium of 0.58% is withheld from employees. |
Frequently asked
Do Washington and Oregon have a reciprocal tax agreement?
No. There is no reciprocal agreement between Washington and Oregon. Washington has no wage income tax, so the question does not arise in practice.
Which state's income tax should be withheld?
Oregon. Washington imposes no wage income tax, so the residence state's claim is the only one that survives.
Which state gets the unemployment insurance wages?
Washington. Unemployment coverage is never split between states for a single job. The localization test assigns the whole job to the state where services are performed, which here is Washington, regardless of residence or where the employer is headquartered.