Work in Illinois, Live in Iowa: Tax Reciprocity Guide

How to claim it

How do I set up reciprocity withholding with my Illinois employer?

The process mirrors what residents of Wisconsin, Kentucky and Michigan follow — Illinois uses the same form for all reciprocal states:

1. Download IL-W-5-NR from the Illinois Department of Revenue website.
2. Complete the form, entering your Iowa address and checking the Iowa box.
3. Submit to your employer's payroll department. They switch withholding from IL to IA.
4. Verify your next pay stub shows Iowa withholding and zero Illinois withholding.

File IL-W-5-NR at the start of employment. If you started without it and Illinois tax has been withheld, see the recovery process below.

Why is this agreement especially important for Quad Cities workers?

The Quad Cities metropolitan area spans the Iowa-Illinois border: Davenport and Bettendorf sit on the Iowa side, while Rock Island, Moline and East Moline are in Illinois. Tens of thousands of residents cross the Mississippi River for work every day. Without reciprocity, each of these commuters would face dual-state filing, credit calculations and the risk of over-withholding. The agreement eliminates all of that for wage earners.

The Quad Cities is, in fact, one of the primary reasons the IL-IA reciprocity agreement has been maintained. The economic interconnection between the Iowa and Illinois sides of the metro makes separate tax regimes impractical for workers.

How do Iowa and Illinois income tax structures differ?

Illinois uses a flat-rate income tax — the same percentage applies regardless of your income level. Iowa, following recent tax reform, has been transitioning toward a simplified bracket structure with a reduced top rate. Check the Iowa Department of Revenue for the current year's rates, as Iowa's rates have changed in recent years due to phased tax reform legislation.

Under reciprocity, you pay Iowa's rates on all your income, including wages earned in Illinois. Whether that is higher or lower than Illinois's flat rate depends on your specific income level and Iowa's current bracket schedule.

What is Iowa's school-district income surtax and does reciprocity affect it?

Iowa allows individual school districts to levy an income surtax on residents. This is a local tax obligation that sits on top of your Iowa state income tax. It applies to your Iowa taxable income — which includes all wages, regardless of where earned. Reciprocity does not change or eliminate this surtax. If your school district levies it, you owe it on your full income including Illinois-earned wages.

The surtax rate varies from district to district. Some districts do not levy it at all. Check with your local school district or the Iowa Department of Revenue for the rate that applies to your address.

What if Illinois tax was withheld before I filed IL-W-5-NR?

If your employer withheld Illinois income tax before you submitted the reciprocity form, you need to fix it in stages:

1. File IL-W-5-NR with your employer immediately to stop further Illinois withholding from future paychecks.
2. Ask payroll about a mid-year correction. Some employers can reverse the Illinois withholding and redirect to Iowa. If the IL payments have already been remitted to Springfield, a mid-year fix may not be possible.
3. At year-end, file IL-1040 as a nonresident, reporting zero Illinois-taxable wages under reciprocity. Claim a full refund of all Illinois withholding. Attach your W-2 showing the Illinois wages and withholding amount.
4. Check your W-2 carefully. If your employer corrects withholding mid-year, they may issue a W-2c (corrected form). If not, your original W-2 will show IL withholding that you reclaim through the IL-1040 refund.
5. File IA 1040 as normal. If Iowa tax was under-withheld during the period your employer was sending money to Illinois instead, you may owe Iowa a balance. Consider making an estimated Iowa payment before the filing deadline to avoid underpayment penalties.

To avoid this entire hassle, submit IL-W-5-NR on or before your first day of work.

What if I moved between Iowa and Illinois mid-year?

If you moved from Illinois to Iowa (or vice versa) during the tax year, you are a part-year resident of both states. The reciprocity agreement applies only for the portion of the year you are an Iowa resident working in Illinois.

• While an IL resident: You file IL-1040 as a part-year resident and owe Illinois tax on income earned during your Illinois residency period.
• After becoming an IA resident: File IL-W-5-NR with your employer to switch withholding from IL to IA. File IA 1040 as a part-year resident for the remainder of the year.

Keep a clear record of your move date — both states will ask for it. The part-year resident tax calculator can help you estimate the split.

How does remote or hybrid work affect IL-IA reciprocity?

If you are an Iowa resident employed by an Illinois company and you work some days from your Iowa home, reciprocity still covers all your wages. You owe tax only to Iowa regardless of whether you commute to Rock Island or work remotely from Davenport on any given day. The agreement exempts all your employee compensation from Illinois tax.

The nuance arises if you reverse the scenario: if you are an Iowa resident employed by an Iowa company but occasionally travel to Illinois for meetings or assignments. Brief, occasional travel generally does not create an Illinois filing obligation, but regular presence in Illinois as part of your job duties could. If your situation involves frequent travel rather than a simple daily commute, check with the Illinois Department of Revenue for guidance on nexus and filing thresholds.

Does the reciprocity cover 1099 contractor income or only W-2 wages?

Reciprocity covers only W-2 employee compensation: wages, salaries, tips and commissions. If you perform contract work in Illinois and receive a 1099, that income is Illinois-source and may be subject to Illinois income tax. You would file an Illinois nonresident return for the 1099 income and claim an Iowa credit to avoid double taxation. The IL-W-5-NR form does not apply to contractor arrangements.

For more on how reciprocity compares across all states, see our complete reciprocity agreements list. For the IL-WI reciprocity — the other major Illinois border crossing — see our dedicated guide.