Moved from California to Kentucky Mid-Year: Which State Tax Returns Do You File?
Answer
Two returns, split at the move date. California and Kentucky both tax residents, so each takes the portion of the year you were one. This is a residency question rather than a sourcing question — reciprocity agreements and convenience rules have nothing to do with it.
Last verified
A mid-year move splits the tax year in two, and each state taxes its own half. That is a residency question, so the machinery that governs commuters — reciprocity agreements, convenience rules, nonresident withholding — is beside the point here.
What you file
- 1Part-year return · CaliforniaForm 540NR (part-year resident)
File a California part-year return covering the months you lived in California. A part-year resident of California reports the income received while a California resident, plus any California-source income received during the rest of the year, and prorates the deductions and credits to the residency period.
- 2Part-year return · KentuckyForm 740-NP
File a Kentucky part-year return covering the months you lived in Kentucky. A part-year resident of Kentucky reports the income received while a Kentucky resident, plus any Kentucky-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
| California | Kentucky | |
|---|---|---|
| Taxes wages | Yes — graduated | Yes — flat |
| Reciprocity partners | None | 7 (Form 42A809) |
| Convenience rule | No | No |
| Nonresident return | Form 540NR | Form 740-NP |
| Part-year return | Form 540NR (part-year resident) | Form 740-NP |
| Credit for other-state tax | Schedule S | Schedule ITC |
| Nonresident safe harbour | None published | None published |
| Local income tax | No | Yes |
| Revenue department | California Franchise Tax Board | Kentucky Department of Revenue |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in Kentucky and working in California 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: California → KentuckyBoth states — credit offsets the double tax
- Remote worker: California → KentuckyHome state only
- 1099 contractor: California → KentuckyHome state, plus the client state if you work there
Other California pairs
Questions people actually ask
I moved from California to Kentucky mid-year. Do I have to file in both states?
Two returns, split at the move date. California and Kentucky both tax residents, so each takes the portion of the year you were one. This is a residency question rather than a sourcing question — reciprocity agreements and convenience rules have nothing to do with it.
How do I split my income between California and Kentucky?
By when you received it, measured against the date your domicile actually changed. Income received while you were a California resident belongs on the California return and income received afterwards on the Kentucky 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 California and Kentucky rules on this page were last checked against California Franchise Tax Board and Kentucky Department of Revenue 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.
- California Franchise Tax Board — individual income taxaccessed 2026-08-07
- Kentucky Department of Revenue — individual income taxaccessed 2026-08-07