Indiana County of Residence: Filing, Moves, and Remote Work

Your Indiana county of residence for taxes is fixed as of January 1 each year, and the county where you lived on that date sets the local income tax rate that applies to your entire year’s Indiana income. Every county imposes its own rate on top of the state’s 2.95% adjusted gross income tax, and those county rates currently run from 1.4% in Dearborn County to 2.95% in Cass County.¹ The gap between the lowest and highest county can shift your annual tax bill by hundreds of dollars, so getting the county right on your return matters.

How Indiana Decides Which County You Live In

Indiana uses two independent tests to determine residency for income tax purposes. You are a resident if you were domiciled in Indiana during the tax year, or if you kept a permanent place of residence in Indiana and spent more than 183 days of the year in the state. Meeting either test is enough.²

Domicile is where you intend to make your permanent home. You can only have one at a time, and once established it stays put until you abandon it and set up a new one somewhere else. The 183-day test is a separate, mechanical count and is not itself a domicile test; the two run on parallel tracks.³

When a county assignment is disputed, the Department of Revenue does not simply take your word for it. Under the administrative code, a person is presumed not to have abandoned a prior domicile if they kept a permanent residence there during the year and did more than one of the following: claimed a homestead credit or exemption on a home in that location, voted there, occupied that residence more days than any other, claimed a federal tax benefit based on that being their principal residence, or had a place of employment or business there.⁴

If those factors do not settle the question, the Department can look at where you held a driver’s license, where you were registered to vote, where your vehicles were registered, where your bank accounts were maintained, where you kept family heirlooms and valuables, and where you held memberships in religious, social, or professional organizations.⁴ Utility bills dated within 60 days and lease or mortgage contracts can serve as proof of a residence address.⁵ If you claim residence in a low-rate county but your voter registration, bank accounts, and children’s school enrollment all sit in a higher-rate county, the paper trail will usually win.

What Happens If You Move Between Counties

The January 1 snapshot cuts both ways. Move from a low-rate county to a high-rate county in February, and you pay the lower rate for the entire year. Move the opposite direction on the same day, and you are locked into the higher rate until the following January 1. People planning a move sometimes time it around this date for that reason.

The same snapshot rule applies to nonresidents who work in Indiana: the county where your principal place of employment sat on January 1 sets your county rate for the year.⁶

Filing Your County Tax

Full-year Indiana residents report county tax on Schedule CT-40, filed with the IT-40 individual income tax return. The form asks for the county where you lived on January 1, matches it to the published rate chart, and applies that rate to your Indiana adjusted gross income.⁶ If you and your spouse lived in the same county on January 1, your combined income goes in a single column. If you lived in different counties on that date, income is split between two columns and each portion is taxed at its own county’s rate.

Part-year residents file Form IT-40PNR and use Schedule CT-40PNR to figure county tax. Only the income earned while you were an Indiana resident is subject to the county rate.⁷ If you were an Indiana resident on January 1, the county you lived in that day sets the rate. If you moved into Indiana after January 1, the county where you established residence sets the rate for the Indiana portion of your year.

Nonresidents Who Work in an Indiana County

Living outside Indiana does not exempt you from county tax on Indiana-source wages. If your principal place of work is in an Indiana county on January 1, you owe county tax on the income earned there at the same rate residents of that county pay, and your employer should withhold based on the work county rather than your home address.¹

The “principal place of work” is the county where you earn the greatest percentage of your gross income from wages, salaries, commissions, and similar compensation, and only the adjusted gross income derived from that county is subject to the local tax.⁸ Indiana also applies a 30-day threshold: nonresidents who work in Indiana more than 30 days in a year trigger a filing obligation.

Out-of-State Income and Reciprocal States

Indiana has reciprocal income tax agreements with Kentucky, Michigan, Ohio, Pennsylvania, and Wisconsin. If you are an Indiana resident earning wages, salary, tips, or commissions in one of those states, you report that income as Indiana income and cannot claim a credit for that state’s income tax, because that state should not be taxing your wages. If withholding happened anyway, you file a return in that state to get it back.⁹

For income earned in states without a reciprocal agreement, you report it on your Indiana return and can claim a credit for income taxes paid to that other state, with Arizona and Oregon as notable exceptions where the credit generally is not available. One important limit: the credit applies only against Indiana state income tax, not your Indiana county tax, and it does not cover local income taxes imposed by other states.¹⁰ A reciprocal agreement covering your wages at the state level does not shield those wages from an Indiana county tax when the work is performed in an Indiana county.⁸

What Happens If You Get the County Wrong

Listing the wrong county on a return is not a harmless clerical error when it results in underpaid tax. The late-payment penalty is 10% of the unpaid tax or $5, whichever is greater. Interest accrues on top of that at a rate the Department publishes annually, currently set at 2%. If you were required to make estimated payments and fell short because of a county-rate error, the estimated tax penalty runs from 10% to 25% of the tax liability.¹¹

These issues usually surface during an audit rather than at filing. The Department can request documentation and work through the factors in the domicile rules, including voter registration, driver’s license, and bank accounts.⁴ If your county is reclassified, you owe the difference between the rate you paid and the correct rate, plus penalties and interest going back to the original due date.

Remote Work

Remote work has complicated the county question in ways the statutes have not fully caught up with. A resident who telecommutes from home for an out-of-county employer generally owes county tax based on where they lived on January 1, not where the employer’s office sits. For a nonresident who splits time between a home elsewhere and an Indiana office, the county of the physical workplace controls when that workplace qualifies as the principal place of employment. The administrative code defines “principal place” as the county where the taxpayer earns the greatest percentage of gross income from wages and similar compensation, so the analysis follows where the work is actually performed, not where the employer is headquartered.⁸

1
IN.gov. How to Compute Withholding for State and County Income Tax
2
Indiana Department of Revenue. Income Tax Information Bulletin 55 – Determination of Residence for Individuals Leaving Indiana for Employment in a Foreign Country
3
Indiana General Assembly. Letter of Findings 01-20232230 Individual Income Tax For the Year 2018
4
Legal Information Institute (LII) / Cornell Law School. 45 IAC 3.1-1-22.5 – Determination of Domicile
5
Cornell Law School. 140 IAC 7-1.1-3 – License, Permit, and Identification Card Documentation Requirements
6
Indiana Department of Revenue. County Tax Schedule for Full-Year Indiana Residents Schedule CT-40 Form IT-40
7
Indiana Department of Revenue. IT-40PNR Part Year and Full Year Nonresident Individual Income Tax Booklet
8
Legal Information Institute (LII) / Cornell Law School. 45 IAC 3.1-4-8 – Determination of County of Principal Place of Business or Employment
9
Indiana Department of Revenue. Application of State and County Income Taxes to Residents with Out-of-State Income and Nonresidents with Indiana Source Income
10
Indiana Department of Revenue. Credits
11
Indiana Department of Revenue. Fines, Fees and Penalties