Illinois taxes assignment wages, but residents of Iowa, Kentucky, Michigan, and Wisconsin have reciprocity for qualifying wage compensation. For every other traveler, Illinois filing depends on Illinois-source income and current Form IL-1040 instructions.
Key takeaways
- Illinois says compensation earned in Illinois by residents of Iowa, Kentucky, Michigan, or Wisconsin is not subject to Illinois income tax under reciprocal agreements. Illinois also distinguishes wages from other income that may still be Illinois-source income.
- When reciprocal-state tax is withheld in error, Illinois directs the taxpayer toward the appropriate refund process rather than using the mistaken withholding as an Illinois resident credit.
How Illinois Travel Nurse Taxes works
Illinois says compensation earned in Illinois by residents of Iowa, Kentucky, Michigan, or Wisconsin is not subject to Illinois income tax under reciprocal agreements. Illinois also distinguishes wages from other income that may still be Illinois-source income.
When reciprocal-state tax is withheld in error, Illinois directs the taxpayer toward the appropriate refund process rather than using the mistaken withholding as an Illinois resident credit.
Which return and records may be needed?
Tell payroll your legal residence during onboarding and check the first pay stub. If you do not qualify for reciprocity, use current Illinois Form IL-1040 and Schedule NR instructions, then apply your resident state’s credit rules separately.
Read the complete multi-state taxes guide.
Why state residency and your federal tax home are different
A state return asks which state may tax income. The federal travel-nurse tax-home analysis asks whether you were away from a qualifying tax home and incurred duplicated living expenses. One label does not establish the other, so keep the records for each question separate.
See the travel nurse tax-home guide.
What to do before your first paycheck
- Tell payroll if you are an Iowa, Kentucky, Michigan, or Wisconsin resident.
- Compare W-2 state wages and withholding to every Illinois assignment.
- Keep reciprocity paperwork or payroll emails with tax records.
Run the state mix in the Contract Analyzer.
FAQ
Who is exempt from Illinois tax on wages?
Illinois identifies Iowa, Kentucky, Michigan, and Wisconsin residents for qualifying wage reciprocity.
Can wrong Illinois withholding be a home-state credit?
Not always. Illinois says a reciprocal-state resident should pursue the appropriate refund.
Do I need an Illinois return for a short assignment?
It depends on your residence, Illinois-source income, and whether reciprocity applies.
Does Illinois reciprocity cover 1099 income?
Do not assume so; the published rule concerns employee compensation.
Sources and filing note
This is general educational information, not individualized tax advice. Tax forms and rules change; use current official instructions and consult a qualified tax professional for a multi-state or tax-home question.