Moved from Missouri to Delaware Mid-Year: Which State Tax Returns Do You File?
Answer
Missouri for the first part of the year, Delaware 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 · 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.
- 2Part-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.
The two states, side by side
| Missouri | Delaware | |
|---|---|---|
| Taxes wages | Yes — graduated | Yes — graduated |
| Reciprocity partners | None | None |
| Convenience rule | No | Yes — general rule |
| Nonresident return | Form MO-1040 with Form MO-NRI | Form PIT-NON |
| Part-year return | Form MO-1040 with Form MO-NRI | Form PIT-NON (part-year resident) |
| Credit for other-state tax | Form MO-CR | Schedule I (Form PIT-RES) |
| Nonresident safe harbour | None published | None published |
| Local income tax | Yes | Yes |
| Revenue department | Missouri Department of Revenue | Delaware Division of Revenue |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in Delaware and working in Missouri 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: Missouri → DelawareBoth states — credit offsets the double tax
- Remote worker: Missouri → DelawareConvenience-of-the-employer rule — both states tax you
- 1099 contractor: Missouri → DelawareHome state, plus the client state if you work there
Other Missouri pairs
Questions people actually ask
I moved from Missouri to Delaware mid-year. Do I have to file in both states?
Missouri for the first part of the year, Delaware 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 Missouri and Delaware?
By when you received it, measured against the date your domicile actually changed. Income received while you were a Missouri resident belongs on the Missouri return and income received afterwards on the Delaware 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 Missouri and Delaware rules on this page were last checked against Missouri Department of Revenue and Delaware Division 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.
- Missouri Department of Revenue — individual income taxaccessed 2026-08-07
- Delaware Division of Revenue — individual income taxaccessed 2026-08-07