Indiana State Income Tax Guide (2026)

Indiana's flat state rate has been on a steady phase-down: 3.23% (2022) → 3.15% (2023) → 3.05% (2024) → 3.00% (2025) → 2.95% (2026), targeting 2.9% by 2027 if the revenue trigger continues to hold. HEA 1001 (2022) wrote the framework — each 0.05 percentage-point cut requires that General Fund revenue growth and the budget reserve clear specified thresholds. The schedule has hit every year so far. Normal economic conditions should carry it through 2.9% in 2027. A recession could pause specific steps.

The state rate is half the picture. Every Indiana resident also owes a county income tax — set by the county of residence as of January 1 each year, applied to the same taxable income base, collected with the state return, and remitted to the resident's home county. There's no opt-out. Rates vary dramatically: 0.5% in Newton County to 3% in Pulaski. Major county rates: Marion (Indianapolis) 2.02%, Hamilton (Carmel/Fishers/Noblesville) 1.10%, Allen (Fort Wayne) 1.59%, Lake (Gary/Hammond) 1.50%, St. Joseph (South Bend/Notre Dame) 1.75%, Vanderburgh (Evansville) 1.20%, Tippecanoe (Lafayette/West Lafayette) 1.28%, Vigo (Terre Haute) 1.50%, Monroe (Bloomington) 1.345%.

The state + county rates stack additively. An Indianapolis software engineer at $100K pays 2.95% state ($2,925) + 2.02% Marion County ($2,020) = ~$4,945 combined. The same person living 15 miles north in Carmel pays 2.95% state + 1.10% Hamilton County = ~$4,050. That $900/year difference compounds over a career — the structural reason Hamilton County is the fastest-growing Indianapolis-area county and has been for 20 years. The county tax is the variable that actually shapes Indiana residential decisions, not the state rate.

Indiana has reciprocity with five neighboring states — KY, MI, OH, PA, WI — for wage income. The essential one is the IL-IN agreement. NW Indiana (Lake and Porter counties — Hammond, Gary, Merrillville, Schererville, Valparaiso) sits within commuting distance of downtown Chicago via the South Shore Line or I-90/I-94. Hundreds of thousands of Hoosiers work in Chicago and live in NW Indiana, and the tax mechanics are clean.

Under reciprocity, IN residents working in IL owe only IN tax on those wages. You file Form W-5-NR with your IL employer, who then withholds IN tax (state + your home county) instead of IL state tax. You file a normal IN resident return. The savings versus being a full IL resident: IL state alone is 4.95% flat; IN's combined state + Lake County is roughly 2.95% + 1.50% = 4.45%. That's a 0.5 percentage point savings on every dollar of wages, plus IN's dramatically lower property tax (~0.85% vs Cook County 2.10-2.50% effective). On a $150K Chicago-area income with a $400K home, the total annual tax savings of NW Indiana residency runs $5,000-$8,000.

The trade-off is the commute. The South Shore Line is a real-but-not-luxurious commuter rail; rush-hour driving on I-90 is its own punishment. But the math has worked for two decades, and Lake / Porter county housing remains 30-50% cheaper per square foot than the Cook County equivalent. The same playbook works in reverse for IN residents in Floyd / Clark counties (Southern Indiana) working in Louisville — see the KY guide for the matching half of that commute.

Four scenarios that cover most readers. Find the one closest to you. If none match, the calculator at the top is for you.

Indiana's Property Tax Caps are constitutional (Article 10, Section 1, ratified by voters in 2010): annual property tax cannot exceed 1% of gross assessed value for owner-occupied primary residences, 2% for rental property and farmland, 3% for all other property (commercial, industrial, second homes). Effective rates always at or below those caps. Statewide average ~0.85% on primary residences — among the most homeowner-friendly structures in the country.

Approximate effective rates by county on a primary residence: Marion (Indianapolis) 0.85-0.95%, Hamilton (Carmel/Fishers) 0.85-0.95%, Allen (Fort Wayne) 0.78-0.92%, Lake (Gary/NW IN) 0.93-1.00% (closer to the 1% cap because of Gary's distressed grand list), Tippecanoe (Lafayette) 0.85%, Vanderburgh (Evansville) 0.69%, Monroe (Bloomington) 0.85%, St. Joseph (South Bend) 0.80-0.95%, Vigo (Terre Haute) 0.90-1.00%.

The Constitution-as-property-tax-cap structure is the part most movers from CT, NJ, NY, or IL don't fully appreciate until their first IN property tax bill arrives. A $400K Indianapolis-area home pays ~$3,400/year in property tax. The same house in Cook County Chicago pays $8,400-$10,000. The same house in Westchester or Long Island pays $9,000-$12,000. Over a 30-year mortgage the differential is $150,000-$250,000 of after-tax cash flow. That structural advantage is the underrated half of the IN tax pitch.

The Sun Belt relocation pitch lands at every Indianapolis IT happy hour. Sometimes it's right. Often it isn't — IN is harder to beat on combined tax math than the social-media version suggests. Three variables most pitch decks understate:

If you're earning $100K+ in IN and you're not doing most of these, you may be leaving real money on the table. None of this is exotic. Most of it is 30 minutes of setup once a year and discipline the rest of the year.

Indiana is one of the quietest tax success stories in the country. The combination of a low and falling 2.95% flat state rate, constitutional 1% property tax caps that actually hold, the best 529 credit in the country, and reciprocity with five neighboring states makes IN unusually competitive for working professionals — especially compared to its high-tax neighbors (IL 4.95%, MI 4.25% plus city tax, OH up to 3.5% plus city tax). The mandatory county tax is the wrinkle that some new residents don't see coming.

Run your numbers in the calculator above. Watch your effective rate, not just the 2.95% headline. Then add your county rate manually — the calculator doesn't model it. Marion (Indianapolis) 2.02%, Hamilton 1.10%, Allen 1.59%, Lake 1.50%, St. Joseph 1.75%, Monroe 1.345%, Tippecanoe 1.28%, Vanderburgh 1.20%.

If you have kids, the CollegeChoice 529 credit is almost certainly the single biggest tax lever available to you. 20% credit on the first $7,500 per kid means $1,500 of state tax saved per beneficiary annually — for a two-kid family, that's $3,000/year that for many households zeroes out the entire IN state income tax bill.

If you commute across an IN state line, file the right reciprocity certificate with your employer. IL-IN is Form W-5-NR; the other four states have analogous forms. Skipping it means double-withholding and a credit fight at filing time. If you rent your primary residence, claim the $3,000 Renters Deduction — frequently missed on self-prepared returns.