Moved from Oklahoma to Connecticut Mid-Year: Which State Tax Returns Do You File?
Answer
You file two part-year returns. Oklahoma taxes the income you received while you lived there, Connecticut taxes the income you received after the move, and each state prorates your deductions and credits to its own slice of the year. The date you changed domicile is the dividing line.
Last verified
Part-year returns are designed so that neither state taxes the whole year. The risk is not double taxation by default; it is misassigning income received near the move date, and losing the proration on deductions and credits.
What you file
- 1Part-year return · OklahomaForm 511-NR
File a Oklahoma part-year return covering the months you lived in Oklahoma. A part-year resident of Oklahoma reports the income received while a Oklahoma resident, plus any Oklahoma-source income received during the rest of the year, and prorates the deductions and credits to the residency period.
- 2Part-year return · ConnecticutForm CT-1040NR/PY
File a Connecticut part-year return covering the months you lived in Connecticut. A part-year resident of Connecticut reports the income received while a Connecticut resident, plus any Connecticut-source income received during the rest of the year, and prorates the deductions and credits to the residency period.
The two states, side by side
| Oklahoma | Connecticut | |
|---|---|---|
| Taxes wages | Yes — graduated | Yes — graduated |
| Reciprocity partners | None | None |
| Convenience rule | No | Only against convenience-rule states |
| Nonresident return | Form 511-NR | Form CT-1040NR/PY |
| Part-year return | Form 511-NR | Form CT-1040NR/PY |
| Credit for other-state tax | Form 511-TX | Schedule 2 (Form CT-1040) |
| Nonresident safe harbour | None published | None published |
| Local income tax | No | No |
| Revenue department | Oklahoma Tax Commission | 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 Oklahoma gives:Two part-year returns.
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: Oklahoma → ConnecticutBoth states — credit offsets the double tax
- Remote worker: Oklahoma → ConnecticutHome state only
- 1099 contractor: Oklahoma → ConnecticutHome state, plus the client state if you work there
Other Oklahoma pairs
Questions people actually ask
I moved from Oklahoma to Connecticut mid-year. Do I have to file in both states?
You file two part-year returns. Oklahoma taxes the income you received while you lived there, Connecticut taxes the income you received after the move, and each state prorates your deductions and credits to its own slice of the year. The date you changed domicile is the dividing line.
How do I split my income between Oklahoma and Connecticut?
By when you received it, measured against the date your domicile actually changed. Income received while you were a Oklahoma resident belongs on the Oklahoma return and income received afterwards on the Connecticut return, with each state prorating your deductions, exemptions and credits to its own part of the year. Keep evidence of the move date — a lease, a closing statement, a licence issue date.
How current is this?
The Oklahoma and Connecticut rules on this page were last checked against Oklahoma Tax Commission 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.
- Oklahoma Tax Commission — individual income taxaccessed 2026-08-07
- Connecticut Department of Revenue Services — individual income taxaccessed 2026-08-07