Illinois-Indiana Commuter Tax Guide 2026: No Reciprocal Agreement

KEY INSIGHT

Illinois and Indiana do NOT have a reciprocal tax agreement: Indiana's reciprocal states are Kentucky, Michigan, Ohio, Pennsylvania and Wisconsin, and Illinois's are Iowa, Kentucky, Michigan and Wisconsin. Without reciprocity, the work state's normal nonresident rules apply, and the home state gives a credit for tax paid to it (Illinois residents: Schedule CR). Illinois Form IL-W-5-NR is only for residents of those four Illinois reciprocal states.

At a glance

Key Facts

IL-IN Reciprocity — Not In Effect

Illinois and Indiana are not reciprocal states, so the work state can tax wages under its nonresident rules and the home state gives a credit. Self-employment, rental and gambling income are taxed by source in any case. Federal and FICA taxes are unaffected.

Credit for Tax Paid to the Other State

Because there is no reciprocity, Illinois Form IL-W-5-NR (for residents of Iowa, Kentucky, Michigan and Wisconsin) does not apply to Indiana commuters. Claim the credit for tax paid to the other state on your home-state return (Illinois residents: Schedule CR) and confirm details with the state revenue departments.

Illinois Income Tax 2026

Illinois flat rate: 4.95% on all income regardless of amount (no brackets). The 2026 personal exemption is $2,925 (not allowed if federal AGI exceeds $250,000 single / $500,000 joint); no separate capital gains rate. Illinois has a relatively low income tax rate but high property taxes — effective total state/local tax burden can be high in Cook County. Self-employed pay the 4.95% on net self-employment income.

Indiana Income Tax 2026

Indiana flat rate: 2.95% state income tax on all income. Indiana counties each add their own income tax (residence-based): ranges from 0.5% to 3.0% of adjusted gross income. Marion County (Indianapolis): 2.02%. Lake County (Gary/Hammond area): 1.5%. St. Joseph County (South Bend): 1.75%. Vanderburgh County (Evansville): 1.25%. Total Indiana burden for many northwest Indiana commuters: 2.95% state + 1.5% Lake County = 4.45% — still less than Illinois's 4.95%.

Remote Work and Reciprocity

Without reciprocity, remote work does not change the rule that where the work is physically performed and where you live determine which state(s) can tax the wages. Check each state's nonresident sourcing and credit rules, and confirm with your employer's payroll team or a tax professional.

Introduction

Illinois and Indiana have no reciprocal tax agreement, so commuters who cross the state line generally face the work state's nonresident rules and then claim a credit on the home-state return. The rate gap is still worth modelling: Illinois's 4.95% flat rate vs Indiana's 2.95% flat rate (plus Indiana county tax).

Section 01

Step-by-Step: Fixing Wrong-State Withholding

Illinois and Indiana are not reciprocal states, so withholding in the work state is generally correct rather than a wrong-state withholding to be refunded. Claim a credit for tax paid to the other state on your home-state return (Illinois residents: Schedule CR) and confirm the details with the state revenue departments or a tax professional.

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FAQ

Frequently Asked Questions

Does the IL-IN reciprocal agreement still apply if I work from home part of the week?

Illinois and Indiana have no reciprocal agreement, so remote work does not create an exemption. Where you physically perform the work and where you live determine which state(s) can tax the wages; the home state gives a credit for tax paid to the other state. Confirm with the state revenue departments or a tax professional.

Which Indiana counties border Illinois and have high commuter populations?

Northwest Indiana is the primary IL-IN commuter corridor. Key Indiana counties: Lake County (Gary, Hammond, Munster, Highland, Merrillville — immediately east of Chicago); Porter County (Valparaiso, Portage — 30–45 minutes from Chicago); Newton County (Moroccan/Kentland area); Jasper County (Rensselaer area). Lake County, Indiana has some of the highest concentrations of Illinois-employed Indiana residents in the country — a significant share of Lake County workers commute to Chicago jobs. The rate differential between Indiana (2.95% + 1.5% Lake County = 4.45%) and Illinois (4.95%) matters for these commuters, but there is no reciprocal agreement.

Does the IL-IN reciprocal agreement apply to self-employment income?

There is no IL-IN agreement to apply. Self-employment income is generally taxed where the services are performed: an Indiana-resident sole proprietor who works half the time at Illinois client sites would likely owe Illinois income tax on that portion and claim a credit at home. Allocate income by state and consider a tax professional familiar with IL and IN.

What is the property tax situation in northwest Indiana vs. Chicago?

Property tax is often the bigger financial driver for IL-IN housing decisions than income tax. Illinois (particularly Cook County) has some of the highest property tax rates in the nation — effective rates of 1.8–2.5% in many Chicago suburbs. Lake County, Indiana effective rates are typically 0.8–1.3% — roughly half Chicago's burden for comparable property values, with property values also lower. Combined with Indiana's lower income tax rate, the total state/local tax burden for homeowners is meaningfully lower in northwest Indiana. This is why many Chicago-area workers live in Indiana — the cross-state commute (even by South Shore Line rail) produces significant lifetime tax and housing cost savings.

Disclaimer:This guide provides general tax information for educational purposes only. Reciprocal agreement rules and state income tax rates change. Remote work tax treatment is evolving. Nothing in this guide constitutes tax advice. Consult a tax professional for guidance on your specific IL-IN commuter tax situation.

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Illinois-Indiana Commuter Tax Guide 2026: No Reciprocal Agreement

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Step-by-Step: Fixing Wrong-State Withholding

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Does the IL-IN reciprocal agreement still apply if I work from home part of the week?

Which Indiana counties border Illinois and have high commuter populations?

Does the IL-IN reciprocal agreement apply to self-employment income?

What is the property tax situation in northwest Indiana vs. Chicago?

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Illinois-Indiana Commuter Tax Guide 2026: No Reciprocal Agreement

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Step-by-Step: Fixing Wrong-State Withholding

TaxHub

Frequently Asked Questions

Does the IL-IN reciprocal agreement still apply if I work from home part of the week?

Which Indiana counties border Illinois and have high commuter populations?

Does the IL-IN reciprocal agreement apply to self-employment income?

What is the property tax situation in northwest Indiana vs. Chicago?

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