Moved from Delaware to Missouri Mid-Year: Which State Tax Returns Do You File?
Answer
Delaware for the first part of the year, Missouri for the rest. Each state's part-year return reports the income received during that state's residency period and prorates the standard deduction, exemptions and credits accordingly. Keep evidence of the date you actually changed domicile.
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 · DelawareForm PIT-NON (part-year resident)
File a Delaware part-year return covering the months you lived in Delaware. A part-year resident of Delaware reports the income received while a Delaware resident, plus any Delaware-source income received during the rest of the year, and prorates the deductions and credits to the residency period.
- 2Part-year return · MissouriForm MO-1040 with Form MO-NRI
File a Missouri part-year return covering the months you lived in Missouri. A part-year resident of Missouri reports the income received while a Missouri resident, plus any Missouri-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
| Delaware | Missouri | |
|---|---|---|
| Taxes wages | Yes — graduated | Yes — graduated |
| Reciprocity partners | None | None |
| Convenience rule | Yes — general rule | No |
| Nonresident return | Form PIT-NON | Form MO-1040 with Form MO-NRI |
| Part-year return | Form PIT-NON (part-year resident) | Form MO-1040 with Form MO-NRI |
| Credit for other-state tax | Schedule I (Form PIT-RES) | Form MO-CR |
| Nonresident safe harbour | None published | None published |
| Local income tax | Yes | Yes |
| Revenue department | Delaware Division of Revenue | Missouri Department of Revenue |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in Missouri and working in Delaware 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: Delaware → MissouriBoth states — credit offsets the double tax
- Remote worker: Delaware → MissouriHome state only
- 1099 contractor: Delaware → MissouriHome state, plus the client state if you work there
Other Delaware pairs
Questions people actually ask
I moved from Delaware to Missouri mid-year. Do I have to file in both states?
Delaware for the first part of the year, Missouri for the rest. Each state's part-year return reports the income received during that state's residency period and prorates the standard deduction, exemptions and credits accordingly. Keep evidence of the date you actually changed domicile.
How do I split my income between Delaware and Missouri?
By when you received it, measured against the date your domicile actually changed. Income received while you were a Delaware resident belongs on the Delaware return and income received afterwards on the Missouri 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 Delaware and Missouri rules on this page were last checked against Delaware Division of Revenue and Missouri 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.
- Delaware Division of Revenue — individual income taxaccessed 2026-08-07
- Missouri Department of Revenue — individual income taxaccessed 2026-08-07