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1099 Contractor in Illinois with a Ohio Client: Where Do You File?

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

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 Ohio, 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 Ohio is measured in days on the ground rather than in invoices sent.

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

What you file

  1. 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.

  2. 2Nonresident return · OhioForm IT 1040 with Schedule IT NRC

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

  3. 3Resident return · IllinoisSchedule CR

    File the Illinois resident return last and claim the credit for any tax paid to Ohio.

The two states, side by side

 IllinoisOhio
Taxes wagesYes — flatYes — graduated
Reciprocity partners4 (Form IL-W-5-NR)5 (Form IT 4NR)
Convenience ruleNoNo
Nonresident returnForm IL-1040 with Schedule NRForm IT 1040 with Schedule IT NRC
Credit for other-state taxSchedule CROhio Schedule of Credits (resident credit)
Nonresident safe harbour30 daysNone published
Local income taxNoYes
Revenue departmentIllinois Department of RevenueOhio Department of Taxation
Last verified

The other direction

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

Ohio to Illinois →

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 Illinois pairs

Questions people actually ask

I live in Illinois and my client is in Ohio. Do I have to file a Ohio 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 Ohio, 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 Ohio hold an agreement makes no difference to a self-employed filer — sourcing rules decide the answer instead.

How current is this?

The Illinois and Ohio rules on this page were last checked against Illinois Department of Revenue and Ohio Department of Taxation 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.