Moved from Washington to Connecticut Mid-Year: Which State Tax Returns Do You File?
Answer
One return, filed in Connecticut. Washington levies no personal income tax, so nothing is due for the part of the year you lived there. A Connecticut part-year return covers the income you received after the move, with deductions and credits prorated to that period.
Last verified
Coming from a state with no income tax means arriving with no Connecticut withholding history and no prior-year liability to base estimates on. The first Connecticut return is where that catches up, so the withholding start date matters.
What you file
- 1Part-year return · ConnecticutForm CT-1040NR/PY
File a Connecticut part-year return covering the months you lived in Connecticut. 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 | Connecticut | |
|---|---|---|
| Taxes wages | No | Yes — graduated |
| Reciprocity partners | None | None |
| Convenience rule | No | Only against convenience-rule states |
| Nonresident return | Not applicable | Form CT-1040NR/PY |
| Part-year return | Not applicable | Form CT-1040NR/PY |
| Credit for other-state tax | No income tax | Schedule 2 (Form CT-1040) |
| Nonresident safe harbour | Not applicable | None published |
| Local income tax | No | No |
| Revenue department | Washington State Department of Revenue | Connecticut Department of Revenue Services |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in Connecticut 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 → ConnecticutWork state only
- Remote worker: Washington → ConnecticutNo state income tax on your wages
- 1099 contractor: Washington → ConnecticutClient state only, if you work there
Other Washington pairs
Questions people actually ask
I moved from Washington to Connecticut mid-year. Do I have to file in both states?
One return, filed in Connecticut. Washington levies no personal income tax, so nothing is due for the part of the year you lived there. A Connecticut part-year return covers the income you received after the move, with deductions and credits prorated to that period.
How do I split my income between Washington and Connecticut?
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 Connecticut return. Keep evidence of the move date — a lease, a closing statement, a licence issue date.
How current is this?
The Washington and Connecticut rules on this page were last checked against Washington State Department of Revenue and Connecticut Department of Revenue Services 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
- Connecticut Department of Revenue Services — individual income taxaccessed 2026-08-07