1099 Contractor in Michigan with a California 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 Michigan keeps it Michigan-source and Michigan-taxed. Travel to California to work and that portion becomes California-source, needing a California 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 California is measured in days on the ground rather than in invoices sent.
California publishes no de minimis day count or dollar floor for nonresidents. Any California-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 California Franchise Tax Board nonresident instructions before filing.
What you file
- 1Quarterly estimated payments · Michigan
Make quarterly estimated payments to Michigan Department of Treasury on your full self-employment income — nothing is withheld from a 1099.
- 2Nonresident return · CaliforniaForm 540NR
File a California nonresident return only if you performed services inside California. California publishes no de minimis day count or dollar floor for nonresidents. Any California-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 California Franchise Tax Board nonresident instructions before filing.
- 3Resident return · MichiganForm MI-1040 (credit for income tax imposed by another state)
File the Michigan resident return last and claim the credit for any tax paid to California.
The two states, side by side
| Michigan | California | |
|---|---|---|
| Taxes wages | Yes — flat | Yes — graduated |
| Reciprocity partners | 6 (Form MI-W4) | None |
| Convenience rule | No | No |
| Nonresident return | Form MI-1040 with Schedule NR | Form 540NR |
| Credit for other-state tax | Form MI-1040 (credit for income tax imposed by another state) | Schedule S |
| Nonresident safe harbour | None published | None published |
| Local income tax | Yes | No |
| Revenue department | Michigan Department of Treasury | California Franchise Tax Board |
| Last verified |
The other direction
Reversing the commute does not always reverse the answer. Living in California and working in Michigan 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: Michigan → CaliforniaBoth states — credit offsets the double tax
- Remote worker: Michigan → CaliforniaHome state only
- Moved mid-year: Michigan → CaliforniaTwo part-year returns
Other Michigan pairs
Questions people actually ask
I live in Michigan and my client is in California. Do I have to file a California 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 Michigan keeps it Michigan-source and Michigan-taxed. Travel to California to work and that portion becomes California-source, needing a California 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 Michigan and California hold an agreement makes no difference to a self-employed filer — sourcing rules decide the answer instead.
How current is this?
The Michigan and California rules on this page were last checked against Michigan Department of Treasury and California Franchise Tax Board 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.
- Michigan Department of Treasury — individual income taxaccessed 2026-08-07
- California Franchise Tax Board — individual income taxaccessed 2026-08-07