1099 Contractor in Delaware with a Wisconsin Client: Where Do You File?
Answer
The client's location does not decide this. Self-employment income from personal services is sourced to where the work happens, so working from Delaware keeps it Delaware-source and Delaware-taxed. Travel to Wisconsin to work and that portion becomes Wisconsin-source, needing a Wisconsin nonresident return.
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 Wisconsin is measured in days on the ground rather than in invoices sent.
Wisconsin publishes a dollar floor for nonresidents rather than a day count. Wisconsin publishes a nonresident gross-income floor: a nonresident with Wisconsin gross income below the published amount is not required to file a Wisconsin return. Reaching it brings the whole Wisconsin-source amount into the return.
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 · WisconsinForm 1NPR
File a Wisconsin nonresident return only if you performed services inside Wisconsin. Wisconsin publishes a nonresident gross-income floor: a nonresident with Wisconsin gross income below the published amount is not required to file a Wisconsin return. Reaching it brings the whole Wisconsin-source amount into the return.
- 3Resident return · DelawareSchedule I (Form PIT-RES)
File the Delaware resident return last and claim the credit for any tax paid to Wisconsin.
The two states, side by side
| Delaware | Wisconsin | |
|---|---|---|
| Taxes wages | Yes — graduated | Yes — graduated |
| Reciprocity partners | None | 4 (Form W-220) |
| Convenience rule | Yes — general rule | No |
| Nonresident return | Form PIT-NON | Form 1NPR |
| Credit for other-state tax | Schedule I (Form PIT-RES) | Schedule OS |
| Nonresident safe harbour | None published | Dollar floor published |
| Local income tax | Yes | No |
| Revenue department | Delaware Division of Revenue | Wisconsin Department of Revenue |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in Wisconsin 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 → WisconsinBoth states — credit offsets the double tax
- Remote worker: Delaware → WisconsinHome state only
- Moved mid-year: Delaware → WisconsinTwo part-year returns
Other Delaware pairs
Questions people actually ask
I live in Delaware and my client is in Wisconsin. Do I have to file a Wisconsin tax return?
The client's location does not decide this. Self-employment income from personal services is sourced to where the work happens, so working from Delaware keeps it Delaware-source and Delaware-taxed. Travel to Wisconsin to work and that portion becomes Wisconsin-source, needing a Wisconsin nonresident return.
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 Wisconsin hold an agreement makes no difference to a self-employed filer — sourcing rules decide the answer instead.
How current is this?
The Delaware and Wisconsin rules on this page were last checked against Delaware Division of Revenue and Wisconsin 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
- Wisconsin Department of Revenue — individual income taxaccessed 2026-08-07