Wisconsin/Illinois Tax reciprocity

Forum|Forum|1 year ago
February 25, 2025
1 reply
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I am a full-time Wisconsin resident working in Illinois. My employee withheld state taxes from both states in 2025. I have since submitted an IL-W-5-NR and that has stopped. I have completed my IL-1040 to get a full refund on the Illinois taxes withheld, however, the IL-1040 instructions indicate I need to include a letter from my employer with an explanation of why Illinois taxes were withheld in error. My employer is not willing to write me a letter, is this really necessary??

BrittanyS

Yes per the Illinois Department of Revenue, "If your employer withheld Illinois tax from your pay in error, you must attach a letter from your employer, on company letterhead, to your Form IL-1040 to verify that Illinois tax was withheld in error." Have you explained to your employer that this is a requirement from the Illinois Department of Revenue?

See link below:

Illinois Department of Revenue

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