1099 Contractor in Illinois with a Michigan Client: Where Do You File?
Answer
Two possible returns, one certainty. The certainty is Illinois, which taxes residents on all self-employment income and expects quarterly estimated payments. The possibility is Michigan, which taxes nonresidents on services actually performed inside the state — invoices sent there do not count.
Last verified
Reciprocity agreements are the first thing contractors ask about and the first thing that does not apply to them. Every agreement in the country is a wage-withholding arrangement, and a 1099 has no withholding to switch off.
Michigan publishes no de minimis day count or dollar floor for nonresidents. Any Michigan-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 Michigan Department of Treasury nonresident instructions before filing.
What you file
- 1Quarterly estimated payments · Illinois
Make quarterly estimated payments to Illinois Department of Revenue on your full self-employment income — nothing is withheld from a 1099.
- 2Nonresident return · MichiganForm MI-1040 with Schedule NR
File a Michigan nonresident return only if you performed services inside Michigan. Michigan publishes no de minimis day count or dollar floor for nonresidents. Any Michigan-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 Michigan Department of Treasury nonresident instructions before filing.
- 3Resident return · IllinoisSchedule CR
File the Illinois resident return last and claim the credit for any tax paid to Michigan.
The two states, side by side
| Illinois | Michigan | |
|---|---|---|
| Taxes wages | Yes — flat | Yes — flat |
| Reciprocity partners | 4 (Form IL-W-5-NR) | 6 (Form MI-W4) |
| Convenience rule | No | No |
| Nonresident return | Form IL-1040 with Schedule NR | Form MI-1040 with Schedule NR |
| Credit for other-state tax | Schedule CR | Form MI-1040 (credit for income tax imposed by another state) |
| Nonresident safe harbour | 30 days | None published |
| Local income tax | No | Yes |
| Revenue department | Illinois Department of Revenue | Michigan Department of Treasury |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in Michigan and working in Illinois 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: Illinois → MichiganReciprocal agreement — file the exemption form
- Remote worker: Illinois → MichiganHome state only
- Moved mid-year: Illinois → MichiganTwo part-year returns
Other Illinois pairs
Questions people actually ask
I live in Illinois and my client is in Michigan. Do I have to file a Michigan tax return?
Two possible returns, one certainty. The certainty is Illinois, which taxes residents on all self-employment income and expects quarterly estimated payments. The possibility is Michigan, 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 Illinois and Michigan hold an agreement makes no difference to a self-employed filer — sourcing rules decide the answer instead.
How current is this?
The Illinois and Michigan rules on this page were last checked against Illinois Department of Revenue and Michigan Department of Treasury 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.
- Illinois Department of Revenue — individual income taxaccessed 2026-08-07
- Michigan Department of Treasury — individual income taxaccessed 2026-08-07