Part-Year Resident State Returns Explained
How the move year is split, income allocation, the move date, and the accrual rules
Reviewed by the Fairlight Accounting cross-border tax team — U.S. & Canadian Tax Desks
A part-year resident return covers the year someone moves from a taxing state to Florida: the former state taxes all income received while resident and only its own source income after the move date. The date domicile actually changed is the dividing line, so documenting it matters. Some states accrue certain income to the resident period.
On this page
How income is allocated (rules vary by state)
| Income | Resident period | After the move |
|---|---|---|
| Wages | All wages earned while resident | Only wages for work performed in the state |
| Interest and dividends | Received while resident | Not taxable (intangible income follows domicile) |
| Capital gains | Sales while resident | Only gains on in-state property (real estate, some business interests) |
| Business income | All while resident | In-state business income |
| Retirement income | Taxable while resident (state rules vary) | Protected by federal law (the pensions guide) |
| Accrual rules | New York and Connecticut require accruing income fixed before the move (such as installment sale gain or deferred compensation) to the resident period; California taxes later installment gains on property sold while a resident | — |
The move date
The date domicile changes — not just the date the truck arrived. Evidence: the closing on the Florida home, the Florida driver's licence and voter registration, the declaration of domicile, and where you spent the following days.
Timing income events
A large gain realized just after a well-documented move escapes the former state's resident tax (unless it's that state's source income or caught by an accrual rule); one realized before is fully taxable. States review income events clustered around the move date.
Frequently asked questions
What is a part-year resident return?
The return for the year you move, taxing all income while resident and only state-source income afterward.
How is investment income allocated?
Generally by when it's received — intangible income after the move isn't taxable by the former state.
What determines my move date?
When your domicile actually changed — supported by records, not just the moving date.
Can my old state tax income I receive after moving?
Yes, if it's that state's source income or caught by an accrual rule.
Official sources
The New York State Department of Taxation and Finance explains: “Furthermore, your New York domicile does not change until you can demonstrate with clear and convincing evidence that you have abandoned your New York domicile and established a new domicile outside New York State. This means shifting the focus of your life to the new location.” — New York State Department of Taxation and Finance, Frequently Asked Questions about Filing Requirements, Residency, and Telecommuting for New York State Personal Income Tax, https://www.tax.ny.gov/pit/file/nonresident-faqs.htm
The California Franchise Tax Board explains: “Part-year residents of California are taxed on all income received while a resident and only on income from California sources while a nonresident.” — California Franchise Tax Board, FTB Publication 1031, 2025 Guidelines for Determining Resident Status, https://www.ftb.ca.gov/forms/2025/2025-1031-publication.pdf
Next step
Fairlight Accounting is a cross-border accounting and tax practice with a U.S. Tax Desk and a Canadian Tax Desk. Our U.S. Tax Desk handles part-year state returns for the move year, income allocation, and timing of income events around a move to Florida. See pricing or book a call.
Cross-border taxes, handled in one place
U.S. and Canadian filings prepared together by our U.S. and Canadian Tax Desks.
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