Moved from Washington to California Mid-Year: Which State Tax Returns Do You File?
Answer
Only the state you moved to wants a return. Living in Washington produced no state filing obligation at all, and California taxes you from the date your residency began. Expect California withholding to start with your first post-move paycheck.
Last verified
This move takes you into the state income tax system rather than out of it. Washington asked nothing of you; California does, from the date your residency there begins.
What you file
- 1Part-year return · CaliforniaForm 540NR (part-year resident)
File a California part-year return covering the months you lived in California. Washington has no wage income tax, so there is nothing to file for the earlier part of the year.
The two states, side by side
| Washington | California | |
|---|---|---|
| Taxes wages | No | Yes — graduated |
| Reciprocity partners | None | None |
| Convenience rule | No | No |
| Nonresident return | Not applicable | Form 540NR |
| Part-year return | Not applicable | Form 540NR (part-year resident) |
| Credit for other-state tax | No income tax | Schedule S |
| Nonresident safe harbour | Not applicable | None published |
| Local income tax | No | No |
| Revenue department | Washington State Department of Revenue | California Franchise Tax Board |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in California and working in Washington gives:One part-year return — the state you left.
Same two states, different situation
The withholding answer turns on how you are paid and where the work happens, not only on which two states are involved.
- W-2 commuter: Washington → CaliforniaWork state only
- Remote worker: Washington → CaliforniaNo state income tax on your wages
- 1099 contractor: Washington → CaliforniaClient state only, if you work there
Other Washington pairs
Questions people actually ask
I moved from Washington to California mid-year. Do I have to file in both states?
Only the state you moved to wants a return. Living in Washington produced no state filing obligation at all, and California taxes you from the date your residency began. Expect California withholding to start with your first post-move paycheck.
How do I split my income between Washington and California?
By when you received it, measured against the date your domicile actually changed. Income received while you were a Washington resident belongs on the Washington return and income received afterwards on the California return. Keep evidence of the move date — a lease, a closing statement, a licence issue date.
How current is this?
The Washington and California rules on this page were last checked against Washington State Department of Revenue and California Franchise Tax Board on 2026-08-07. We re-check the full grid every December after state legislative sessions close, and re-check the convenience-of-the-employer states quarterly because that is where the rules move fastest.
Sources
Every fact above comes from the revenue department that publishes the rule. We do not cite secondary summaries, and we do not restate a figure we could not find at source.
- Washington State Department of Revenue — individual income taxaccessed 2026-08-07
- California Franchise Tax Board — individual income taxaccessed 2026-08-07