Work in Indiana, Live in Illinois: How Taxes Work

Reciprocity

Do Illinois and Indiana Have a Tax Reciprocity Agreement?

No. Illinois and Indiana do not share a wage reciprocity agreement. Illinois lists only Iowa, Kentucky, Michigan, and Wisconsin as reciprocal states. Its Schedule NR instructions describe the exemption directly: if you were an Iowa, Kentucky, Michigan, or Wisconsin resident and earned income in Illinois, you are exempt from paying Illinois Income Tax on income you earned from salaries, wages, tips, and other employee compensation.

Indiana's Income Tax Information Bulletin #33 draws a parallel list that also leaves Illinois out. Indiana has established reciprocity agreements with Kentucky, Michigan, Ohio, Pennsylvania, and Wisconsin. Neither state includes the other, so both states claim the right to tax an Illinois resident's Indiana wages.

The mechanism that prevents actual double payment is a credit on the Illinois resident return, not an exemption from Indiana withholding. You will file two state returns each year and use Illinois Schedule CR to offset the Illinois tax by the Indiana tax paid on the same wages.

Filing Obligations

Which Tax Returns Do I File as an Illinois Resident Working in Indiana?

File the Indiana nonresident return first. You need the final Indiana tax figure to calculate the credit on your Illinois return. Indiana's who-should-file guidance is clear: if you were a full-year nonresident of Indiana, but received any income from Indiana sources, you must file your Indiana income taxes. Illinois residents cannot use the simplified IT-40RNR reciprocal form because Illinois is not a reciprocal state; the correct form is IT-40PNR.

On the Illinois side, file IL-1040 as a full-year resident and report all income from every source. Schedule CR (Credit for Tax Paid to Other States) attaches to IL-1040 and pulls the Indiana tax number into the credit calculation. The instructions summarize the purpose: Schedule CR, Credit for Tax Paid to Other States, allows you to take a credit for income taxes you paid to other states on income you received while a resident of Illinois.

Both individual returns are due April 15. Illinois grants an automatic six-month extension to file, but if you will owe tax you must pay it with Form IL-505-I by the due date. Indiana's extension runs later than the federal one: Form IT-9 or a federal Form 4868 extended the 2025 Indiana filing time to November 16, 2026.

Resident Credit

How Does Illinois Prevent Double Taxation on My Indiana Wages?

Illinois taxes its residents on all income, and Indiana taxes nonresidents on income from Indiana sources. Schedule CR closes the gap. On the 2025 form, you enter the tax you actually paid to Indiana (state plus county) on line 51, and line 54 is the Illinois tax on the same income. The lesser of the two is your credit, carried to IL-1040, line 15. Use the tax shown on the Indiana return, not the withholding on your W-2.

Illinois charges a flat 4.95%, with a personal exemption of $2,925 for tax year 2026 ($2,850 for 2025). Indiana's state rate is 2.95% for 2026. Because the Illinois rate is higher, the Indiana tax usually sets the credit, and Illinois still collects the difference on your Indiana wages.

Keep your Indiana return with your records: Illinois says you must send your out-of-state returns if it asks for them. If you claim a credit for tax paid to a local government, such as an Indiana county, attach copies of the local return or the W-2 forms showing the local wages.

Employer Withholding

How Should My Indiana Employer Handle Withholding?

Your Indiana employer withholds Indiana state income tax, 2.95% for 2026, on wages for work performed in Indiana. Bulletin #33 puts the rule up front: the withholding of Indiana income taxes is required for all nonresidents employed in Indiana, except for legal residents of states complying with Indiana's reciprocity statute. Illinois is not one of those states.

Indiana withholding covers only Indiana tax. Because Illinois taxes residents at 4.95%, you may still owe Illinois at filing time after the Schedule CR credit. Illinois expects estimated payments if your yearly liability, after withholding and credits, will be more than $1,000.

Indiana county tax is withheld too if your principal place of employment is in an Indiana county on January 1. It counts toward the Schedule CR credit along with the Indiana state tax.

County Tax

Do I Owe Indiana County Tax If I Live in Illinois?

Possibly. Indiana county tax (the local income tax, or LIT) reaches Illinois residents through the principal place of employment rule in Departmental Notice #1: if you live out of state on January 1 but your principal place of work is in an Indiana county on that date, that county's rate applies for the year. If you did not start work in Indiana until after January 1, no county tax applies that year.

For Illinois residents working in northwest Indiana, the 2026 rates include Lake County at 1.5% and Porter County at 0.5%. Nonresidents figure it on Schedule CT-40PNR, Section 2, which lets you enter some or all of your exemptions.

Both the Indiana state tax and the county tax count on Illinois Schedule CR, which includes tax paid to a political subdivision such as a county, and the lesser-of limit applies to the total.

On the Illinois side, the Department's materials describe no city or county income tax on wages. Instead, local governments receive 6.47% of the net income tax Illinois collects from individuals, trusts and estates.

Worked Example: Illinois Resident Earning $70,000 in Indiana

Single filer, all wages from work in Indiana, Lake County principal workplace on January 1, 2026. Indiana $1,000 exemption, Illinois 2026 exemption of $2,925. Approximate.

Remote Work

What If I Work from Home in Illinois for an Indiana Employer?

Indiana taxes a nonresident on the wages earned in Indiana, so days you work from your Illinois home are not Indiana wages. As an Illinois resident, you pay Illinois tax on all of your wages anyway, so the home days are simply taxed by Illinois alone, with no credit.

Allocate your wages by where you actually worked. Report only the Indiana portion on the IT-40PNR, and base Schedule CR on the Indiana tax on that portion. Ask your employer to set up withholding so Indiana tax is figured on the Indiana-day share.

Occasional visits have their own rule. Departmental Notice #1 says an employer is not required to withhold state or county tax for some employees who will work in Indiana for 30 days or less during the year; the employee uses Form WH-4AFF. If the employee goes past 30 days, the employer must withhold the tax that would have applied to the first 30 days and keep withholding after that. A regular hybrid commuter passes 30 days early in the year.

Keep a daily log or calendar of where you worked, in case either state asks you to support the split.

Mid-Year Move

What If I Moved Between Illinois and Indiana During the Year?

If you changed permanent residence between Illinois and Indiana during the year, file as a part-year resident in each state. Illinois residents use Form IL-1040 with Schedule NR to allocate income to the resident and nonresident periods. Indiana part-year residents use Form IT-40PNR, the same form Illinois residents already use for the nonresident share.

During the months you lived in Illinois and worked in Indiana, the standard credit mechanism through Schedule CR applies to Indiana tax paid on Indiana wages. During the months you lived in Indiana, Indiana taxes you as a resident on all income, and Illinois taxes only your Illinois-source income for that period.

Document your move date with utility activation records, lease or mortgage dates, and driver's license changes. Both states will ask you to identify the residency change date because each state's claim to your income depends on which days you were a resident.

Withholding Errors

What If My Employer Withheld Illinois Tax Instead of Indiana Tax?

Payroll systems sometimes withhold based on the employer's location rather than the employee's residence. If your Indiana employer mistakenly withheld Illinois tax on your Indiana wages, you will owe Indiana the full amount when you file IT-40PNR. Report the incorrectly withheld Illinois tax as a payment on your IL-1040, and Illinois will refund the excess after the credit is applied.

The more common misconfiguration is no state tax withheld at all, which happens when a payroll system does not treat the employee as a nonresident for the state in which the work occurs. If nothing was withheld, you owe Indiana at filing time and Illinois at filing time after the credit, and you may face underpayment penalties in both states. Set up estimated payments for future quarters to catch up.

Confirm that your Indiana employer is registered to withhold Indiana income tax and that your payroll record shows your Illinois home address. Check the first pay stub each January to verify Indiana state tax is withheld and, if your January 1 workplace is in an Indiana county, that county's tax is withheld too.