1099 Contractor in Wisconsin with a Kansas Client: Where Do You File?
Answer
Two possible returns, one certainty. The certainty is Wisconsin, which taxes residents on all self-employment income and expects quarterly estimated payments. The possibility is Kansas, which taxes nonresidents on services actually performed inside the state — invoices sent there do not count.
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 Kansas is measured in days on the ground rather than in invoices sent.
Kansas publishes no de minimis day count or dollar floor for nonresidents. Any Kansas-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 Kansas Department of Revenue nonresident instructions before filing.
What you file
- 1Quarterly estimated payments · Wisconsin
Make quarterly estimated payments to Wisconsin Department of Revenue on your full self-employment income — nothing is withheld from a 1099.
- 2Nonresident return · KansasForm K-40 with Schedule S Part B
File a Kansas nonresident return only if you performed services inside Kansas. Kansas publishes no de minimis day count or dollar floor for nonresidents. Any Kansas-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 Kansas Department of Revenue nonresident instructions before filing.
- 3Resident return · WisconsinSchedule OS
File the Wisconsin resident return last and claim the credit for any tax paid to Kansas.
The two states, side by side
| Wisconsin | Kansas | |
|---|---|---|
| Taxes wages | Yes — graduated | Yes — graduated |
| Reciprocity partners | 4 (Form W-220) | None |
| Convenience rule | No | No |
| Nonresident return | Form 1NPR | Form K-40 with Schedule S Part B |
| Credit for other-state tax | Schedule OS | Form K-40 (credit for taxes paid to other states) |
| Nonresident safe harbour | Dollar floor published | None published |
| Local income tax | No | No |
| Revenue department | Wisconsin Department of Revenue | Kansas Department of Revenue |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in Kansas and working in Wisconsin 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: Wisconsin → KansasBoth states — credit offsets the double tax
- Remote worker: Wisconsin → KansasHome state only
- Moved mid-year: Wisconsin → KansasTwo part-year returns
Other Wisconsin pairs
Questions people actually ask
I live in Wisconsin and my client is in Kansas. Do I have to file a Kansas tax return?
Two possible returns, one certainty. The certainty is Wisconsin, which taxes residents on all self-employment income and expects quarterly estimated payments. The possibility is Kansas, which taxes nonresidents on services actually performed inside the state — invoices sent there do not count.
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 Wisconsin and Kansas hold an agreement makes no difference to a self-employed filer — sourcing rules decide the answer instead.
How current is this?
The Wisconsin and Kansas rules on this page were last checked against Wisconsin Department of Revenue and Kansas 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.
- Wisconsin Department of Revenue — individual income taxaccessed 2026-08-07
- Kansas Department of Revenue — individual income taxaccessed 2026-08-07