Illinois vs Indiana for Remote Workers: Flat Tax Comparison and County Tax Differences

Illinois and Indiana share a 280-mile border and one of the largest state-to-state commuting corridors in the Midwest, anchored by the Chicago metro area and the northwest Indiana cities of Gary, Hammond, and Merrillville. Both states apply flat income taxes — Illinois at 4.95% under 35 ILCS 5/201, Indiana at 3.05% under IC 6-3-2-1. The 190-basis-point state rate differential favors Indiana, but Indiana's county income tax of 0.5% to 3.0% under IC 6-3.5-6 substantially closes the gap depending on county of residence or work.

The two states have a long-standing reciprocity agreement that simplifies cross-border commuting. An Illinois resident working in Indiana files Form IL-W-5-NR and pays only Illinois tax; an Indiana resident working in Illinois files Form WH-47 and pays only Indiana tax plus county tax. Remote work further simplifies the analysis: Indiana does not enforce the convenience-of-employer rule, and Illinois does not either. This guide works through the math at $75,000, $200,000, and $500,000 and explains the Chicago-Indianapolis dynamics that drive the corridor.

The headline comparison

The table below summarizes the structural tax differences between Illinois and Indiana for the 2025 tax year. Figures are drawn from the Illinois Department of Revenue, the Indiana Department of Revenue, the Illinois Department of Employment Security, the Indiana Department of Workforce Development, and the relevant state statutes cited inline.

Income tax comparison at $75,000

Consider a single filer earning $75,000 in wage income in 2025. An Illinois resident subtracts the $2,425 personal exemption, producing taxable income of $72,575. The Illinois flat income tax of 4.95% applies, producing tax of $3,592. Illinois does not levy an employee SUI contribution, so the total Illinois state burden is approximately $3,592 per year.

An Indiana resident earning $75,000 subtracts the $1,000 standard deduction and $1,500 personal exemption, producing taxable income of $72,500. The Indiana flat state income tax of 3.05% produces tax of $2,211. The county income tax adds 0.5% to 3.0% depending on county, with most counties between 1.0% and 2.0%. Using a typical 1.5% county rate, the county tax is $1,088. Total Indiana state plus county burden: approximately $3,299 per year. In a high-tax county like Marion (Indianapolis) at 2.02%, the total is approximately $3,675 — essentially equal to Illinois. In a low-tax county like Jasper at 0.5%, the total is approximately $2,574 — approximately $1,018 less than Illinois.

Income tax comparison at $200,000

At $200,000 of wages, the Illinois flat rate continues to apply uniformly. Taxable income after the personal exemption is $197,575, producing Illinois income tax of $9,780. The Indiana resident at $200,000 has taxable income of $197,500 after the standard deduction and personal exemption. The Indiana state income tax of 3.05% produces tax of $6,024. The county income tax at the typical 1.5% rate adds $2,963. Total Indiana state plus county burden: approximately $8,987 per year.

The Illinois-to-Indiana savings at $200,000 in a typical county is approximately $793 per year — modest but meaningful when compounded with property tax and sales tax differentials. In a low-tax county like Jasper, the savings exceeds $1,800. In Marion County (Indianapolis), the savings essentially disappears because the 2.02% county rate plus the 3.05% state rate produces a combined 5.07% rate, exceeding Illinois's 4.95%. This is why Chicago residents considering a move to Indianapolis should model the specific county tax rate, not assume that Indiana is automatically lower.

Income tax comparison at $500,000

At $500,000 of wages, the flat-rate structure of both states produces predictable math. The Illinois resident subtracts the $2,425 personal exemption, producing taxable income of $497,575. The 4.95% flat rate produces income tax of $24,630. The Indiana resident at $500,000 has taxable income of $497,500 after the standard deduction and personal exemption. The Indiana state income tax of 3.05% produces tax of $15,174. The county income tax at the typical 1.5% rate adds $7,463. Total Indiana state plus county burden: approximately $22,637 per year.

The Illinois-to-Indiana savings at $500,000 in a typical county is approximately $1,993 per year. In a low-tax county the savings can approach $3,500; in Marion County the Illinois resident actually pays less than the Indianapolis resident. The state-rate differential matters more for higher earners, but the Indiana county tax substantially closes the gap. The cumulative savings over a 10-year career at $500,000 income ranges from $20,000 to $35,000 depending on county — meaningful but substantially smaller than the savings from moving to a no-tax state like Texas, Florida, or Washington.

Beyond income tax: the full tax picture

Property tax cuts sharply in Indiana's favor. Illinois has the second-highest effective property tax rate in the country at approximately 2.07% of market value, driven by school district levies and pension obligations. Indiana's effective rate of approximately 0.81% is among the lowest in the Midwest, supported by the state's property tax cap framework under IC 6-1.1-20.4 (1%, 2%, 3% caps for homesteads, residential, and other property respectively). A homeowner with a $500,000 home pays approximately $10,350 in Illinois property tax versus $4,050 in Indiana — a $6,300 annual premium that dwarfs the income tax differential.

Sales tax is comparable in the aggregate. Illinois levies 6.25% state plus local add-ons that push combined rates to 10.25% in Chicago, 9.5% in Cook County suburbs, and 7.25%-8.75% in downstate counties. Indiana levies 7% flat statewide under IC 6-2.5-2 with no local add-ons. Chicago residents pay the third-highest combined sales tax in the country. Indiana's flat 7% is lower than Chicago but higher than downstate Illinois. For a household spending $30,000 annually on taxable consumer goods, the Chicago-to-Indiana savings is approximately $975 per year. Gasoline tax favors Indiana modestly (approximately 54 cents per gallon versus Illinois's approximately 67 cents per gallon under 35 ILCS 105/3).

Estate tax is a meaningful differentiator. Illinois levies an estate tax under 35 ILCS 405 with a $4 million exemption (inflation-unadjusted) and a graduated rate up to 16%, with the same "cliff" structure as New York that eliminates the exemption for estates exceeding 105% of the threshold. Indiana has no estate tax and no inheritance tax (repealed effective 2013 under IC 6-4.1). For a household with a $6 million estate, the Illinois estate tax exceeds $400,000, while the Indiana estate tax is $0. This makes Indiana particularly attractive for high-net-worth retirees.

Cost of living comparison

Housing costs favor Indiana substantially. Median home prices in Indianapolis sit around $275,000, while comparable Chicago metro prices range from $350,000 (far west suburbs like Naperville-adjacent Aurora) to $700,000+ (Lincoln Park, Lakeview, Naperville proper). The Chicago downtown condo market is particularly expensive, with two-bedroom units starting at $500,000 in desirable neighborhoods. Rental costs follow a similar pattern, with Chicago one-bedroom apartments renting for $2,200-$3,200 versus $1,200-$1,800 in Indianapolis.

Childcare, healthcare, and food costs run 15-25% lower in Indianapolis than in Chicago according to BLS regional CPI data. Chicago benefits from a much larger cultural and professional sports infrastructure, world-class museums, and a more diverse restaurant scene. Indianapolis offers a strong sports culture (the Indianapolis 500, Pacers, Colts), a growing technology sector anchored by Salesforce and Eli Lilly, and substantially shorter commute times. Both states have invested in remote-work infrastructure, with broadband availability comparable in major metros but uneven in rural areas of both states.

Remote work considerations

The reciprocity agreement between Illinois and Indiana simplifies cross-border commuting. An Illinois resident working in Indiana files Form IL-W-5-NR with the Indiana employer and pays Illinois tax only — no Indiana withholding, no Indiana state return. The reverse arrangement applies for an Indiana resident working in Illinois, who files Form WH-47 and pays Indiana tax plus county tax. Reciprocity covers wage income only; business income, rental income, and capital gains sourced to the other state remain taxable there. The reciprocity arrangement depends on the employee physically performing work in the state of residence at least part of the time.

Neither Illinois nor Indiana enforces the convenience-of-employer rule. A purely remote arrangement where an Indiana resident teleworks from Indiana for an Illinois employer produces Illinois tax only on wages earned for work physically performed in Illinois — typically days commuting to the Chicago office. The reverse applies for an Illinois resident teleworking for an Indiana employer. This makes the Illinois-Indiana arrangement particularly favorable for full-remote workers, who can choose the lower-tax state of residence without convenience-rule exposure.

The Illinois residency audit is a moderate risk. The Illinois Department of Revenue audits moves to lower-tax states using the domicile factors established in Illinois case law, including driver license, voter registration, time-in-state, location of family, and where high-value personal property is kept. Illinois does not have a separate statutory residency rule with a 183-day or 184-day threshold, so the domicile test is the primary audit hook. Taxpayers who leave behind an Illinois residence, retain an Illinois physician, or keep Illinois-registered vehicles face elevated audit risk. Indiana does not aggressively audit inbound moves, since the state is a net beneficiary of midwestern migration flows.

Quality of life factors

Illinois offers world-class urban amenities in Chicago — museums (Art Institute, Field Museum, Museum of Science and Industry), professional sports (Cubs, White Sox, Bears, Bulls, Blackhawks), a deep restaurant scene, and exceptional public transit (the CTA and Metra commuter rail). The state's higher-education sector includes the University of Illinois at Urbana-Champaign, Northwestern University, and the University of Chicago. Trade-offs include the second-highest property taxes in the country, severe fiscal pressure on state and local pensions, and population outflow that has accelerated since 2020.

Indiana offers substantially lower housing costs, lower property taxes, a strong manufacturing and logistics economy, and a growing technology sector in Indianapolis. The Indianapolis metro hosts the Indianapolis 500, the NBA Pacers, the NFL Colts, and a vibrant downtown cultural district. Indiana University (Bloomington) and Purdue University (West Lafayette) anchor a strong public higher-education system. Trade-offs include less cultural density than Chicago, more limited public transit, and a regulatory environment that some find less appealing. Both states support remote work, with comparable broadband availability in major metros.

Which state wins for which type of remote worker

Indiana wins for most remote workers, particularly those earning $100,000-$500,000 who plan to buy a home. The combination of lower income tax (in most counties), substantially lower property tax, lower housing costs, and lower gasoline tax produces a total tax-and-living-cost advantage of $10,000-$20,000 annually for a typical household. Indiana also wins for households planning to retire with a meaningful estate, given the absence of an estate tax. Suburban Indianapolis (Hamilton County, Johnson County) and the Bloomington area are particularly attractive for remote workers seeking lower cost of living.

Illinois wins for workers whose careers depend on physical presence in the Chicago economy — finance, advertising, commodities trading, management consulting — sectors where in-person collaboration drives compensation. Illinois also wins for households who value urban density, world-class cultural institutions, and walkable neighborhoods, and for high-income earners in a county with an Indiana property tax cap. The Chicago downtown tech corridor (River North, West Loop) hosts Google, Salesforce, and other major employers, and the city's venture capital and private equity ecosystem supports founders seeking capital. For households already established in Chicago with a long-tenured home, the property tax differential is partially offset by Illinois's mortgage interest deduction and homestead exemption.

Common mistakes when choosing between these two states

The most common mistake is comparing only state income tax rates without modeling the Indiana county tax. The 0.5%-3.0% county income tax can push the effective Indiana rate above the Illinois 4.95% rate in high-tax counties like Marion (Indianapolis). The second mistake is ignoring property tax differences. Illinois's 2.07% effective property tax rate is the second-highest in the country and adds $6,000+ annually for a typical $500,000 home. The third mistake is assuming reciprocity is automatic — employees must file Form IL-W-5-NR or Form WH-47 with the employer to claim exemption from work-state withholding.

The fourth mistake is overlooking the Illinois estate tax exposure. With a $4 million exemption and the cliff structure, a household with a $5 million estate faces approximately $250,000 in Illinois estate tax, while the Indiana estate tax is $0. The fifth mistake is assuming the Illinois flat tax will become progressive — voters rejected the proposed progressive tax amendment in 2020, and the constitutional amendment would need to be re-proposed and re-approved. The 4.95% flat rate has been stable since 2017 and is unlikely to change in the near term. The sixth mistake is failing to recognize that Indiana's county tax varies by both residence county and work county, with non-resident county tax applying to non-residents who work in a county.

What to do next

Run your numbers through our multi-state withholding calculator using your actual wage income, expected housing costs, and current state of residence. The calculator handles Illinois's flat 4.95% rate and personal exemption, Indiana's flat 3.05% state rate and county tax, and the reciprocity mechanics. If you are choosing between suburban Chicago and suburban Indianapolis for a remote-work lifestyle, model both scenarios including the specific county tax rate for the Indiana target county. If you are an Illinois resident working in Indiana or vice versa, confirm Form IL-W-5-NR or WH-47 is on file with your employer, and verify that work-state withholding is zero on your paystub. Consult a licensed CPA who handles IL-IN cross-border matters before triggering a move, particularly if property holdings or business income is involved.