1099 Contractor in Delaware with a Missouri Client: Where Do You File?
Answer
Delaware taxes all of it; Missouri taxes only what you earn on its soil. Nothing is withheld from a 1099, so you pay Delaware quarterly. A Missouri client alone creates no Missouri filing obligation — performing services inside Missouri does, and Delaware then credits that tax.
Last verified
The client's location is the wrong thing to track. What matters is where you were sitting when you did the work — which is why a contractor's exposure to Missouri is measured in days on the ground rather than in invoices sent.
Missouri publishes no de minimis day count or dollar floor for nonresidents. Any Missouri-source wage income above the state's general filing threshold requires a nonresident return, and that threshold is reset each year — check the current figure on the Missouri Department of Revenue nonresident instructions before filing.
What you file
- 1Quarterly estimated payments · Delaware
Make quarterly estimated payments to Delaware Division of Revenue on your full self-employment income — nothing is withheld from a 1099.
- 2Nonresident return · MissouriForm MO-1040 with Form MO-NRI
File a Missouri nonresident return only if you performed services inside Missouri. Missouri publishes no de minimis day count or dollar floor for nonresidents. Any Missouri-source wage income above the state's general filing threshold requires a nonresident return, and that threshold is reset each year — check the current figure on the Missouri Department of Revenue nonresident instructions before filing.
- 3Resident return · DelawareSchedule I (Form PIT-RES)
File the Delaware resident return last and claim the credit for any tax paid to Missouri.
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 |
| 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:Home state, plus the client state if you work there.
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
- Moved mid-year: Delaware → MissouriTwo part-year returns
Other Delaware pairs
Questions people actually ask
I live in Delaware and my client is in Missouri. Do I have to file a Missouri tax return?
Delaware taxes all of it; Missouri taxes only what you earn on its soil. Nothing is withheld from a 1099, so you pay Delaware quarterly. A Missouri client alone creates no Missouri filing obligation — performing services inside Missouri does, and Delaware then credits that tax.
Do reciprocity agreements help a 1099 contractor?
No. Every state reciprocity agreement in the country is an arrangement about wage withholding between two revenue departments, and a 1099 has no withholding to switch off. Whether Delaware and Missouri hold an agreement makes no difference to a self-employed filer — sourcing rules decide the answer instead.
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