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

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

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 Illinois keeps it Illinois-source and Illinois-taxed. Travel to Utah to work and that portion becomes Utah-source, needing a Utah nonresident return.

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.

Utah publishes no de minimis day count or dollar floor for nonresidents. Any Utah-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 Utah State Tax Commission 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 · UtahForm TC-40 with Schedule TC-40B

    File a Utah nonresident return only if you performed services inside Utah. Utah publishes no de minimis day count or dollar floor for nonresidents. Any Utah-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 Utah State Tax Commission nonresident instructions before filing.

  3. 3Resident return · IllinoisSchedule CR

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

The two states, side by side

 IllinoisUtah
Taxes wagesYes — flatYes — flat
Reciprocity partners4 (Form IL-W-5-NR)None
Convenience ruleNoNo
Nonresident returnForm IL-1040 with Schedule NRForm TC-40 with Schedule TC-40B
Credit for other-state taxSchedule CRSchedule TC-40S
Nonresident safe harbour30 daysNone published
Local income taxNoNo
Revenue departmentIllinois Department of RevenueUtah State Tax Commission
Last verified

The other direction

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

Utah 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 Utah. Do I have to file a Utah 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 Illinois keeps it Illinois-source and Illinois-taxed. Travel to Utah to work and that portion becomes Utah-source, needing a Utah 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 Illinois and Utah hold an agreement makes no difference to a self-employed filer — sourcing rules decide the answer instead.

How current is this?

The Illinois and Utah rules on this page were last checked against Illinois Department of Revenue and Utah State Tax Commission 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.