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1099 Contractor in California with a Iowa Client: Where Do You File?

Home state, plus the client state if you work thereNo withholding — 1099

Answer

California always, Iowa sometimes. With no withholding on a 1099 the whole tax is yours to manage: estimate to California through the year, and file a Iowa nonresident return for any income from work you physically performed in Iowa, claiming the credit back on the California 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 Iowa is measured in days on the ground rather than in invoices sent.

Iowa publishes no de minimis day count or dollar floor for nonresidents. Any Iowa-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 Iowa Department of Revenue nonresident instructions before filing.

What you file

  1. 1Quarterly estimated payments · California

    Make quarterly estimated payments to California Franchise Tax Board on your full self-employment income — nothing is withheld from a 1099.

  2. 2Nonresident return · IowaForm IA 1040 with Schedule IA 126

    File a Iowa nonresident return only if you performed services inside Iowa. Iowa publishes no de minimis day count or dollar floor for nonresidents. Any Iowa-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 Iowa Department of Revenue nonresident instructions before filing.

  3. 3Resident return · CaliforniaSchedule S

    File the California resident return last and claim the credit for any tax paid to Iowa.

The two states, side by side

 CaliforniaIowa
Taxes wagesYes — graduatedYes — flat
Reciprocity partnersNone1 (Form 44-016)
Convenience ruleNoNo
Nonresident returnForm 540NRForm IA 1040 with Schedule IA 126
Credit for other-state taxSchedule SForm IA 130
Nonresident safe harbourNone publishedNone published
Local income taxNoYes
Revenue departmentCalifornia Franchise Tax BoardIowa Department of Revenue
Last verified

The other direction

Reversing the commute does not always reverse the answer. Living in Iowa and working in California gives:Home state, plus the client state if you work there.

Iowa to California →

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.

Other California pairs

Questions people actually ask

I live in California and my client is in Iowa. Do I have to file a Iowa tax return?

California always, Iowa sometimes. With no withholding on a 1099 the whole tax is yours to manage: estimate to California through the year, and file a Iowa nonresident return for any income from work you physically performed in Iowa, claiming the credit back on the California 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 California and Iowa hold an agreement makes no difference to a self-employed filer — sourcing rules decide the answer instead.

How current is this?

The California and Iowa rules on this page were last checked against California Franchise Tax Board and Iowa 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.