Indiana has a state income tax, and it applies to most residents and workers

Indiana charges a state income tax on wages, salaries, and other earnings. The current rate is a flat 3.15 percent, meaning everyone pays the same percentage regardless of how much they earn. This is different from the federal income tax, which uses brackets where higher earners pay higher rates.

If you work in Indiana or live there, you will likely owe state income tax unless your income falls below the filing threshold. Indiana also taxes certain types of investment income and retirement distributions, though the rules vary depending on the source.

Key Takeaways

  • Indiana's state income tax rate is a flat 3.15 percent on wages and most other income.
  • You must file an Indiana state return if your income exceeds the threshold set each year, even if you do not owe federal tax.
  • Indiana offers a standard deduction that reduces the income subject to tax, similar to the federal system.
  • Certain types of income, including some retirement distributions and investment gains, may be taxed differently or exempt from state tax.
  • If your employer withholds too much or too little Indiana tax from your paycheck, you can adjust it using Form IT-4.

How Indiana's flat tax rate compares to other states

Indiana's 3.15 percent flat rate is lower than many neighboring states. For comparison, Ohio taxes income at rates ranging from 0.5 to 5.75 percent depending on income level, while Illinois charges 4.95 percent flat. Kentucky uses a progressive system with rates from 2 to 5 percent. Indiana's single rate means a high earner pays the same percentage as a lower earner, which simplifies the calculation but may feel different if you are used to a progressive system.

The flat rate also means Indiana does not adjust your tax burden based on filing status or number of dependents the way federal tax does. However, Indiana does allow a standard deduction, which lowers your taxable income before the 3.15 percent is applied.

Who has to file an Indiana state return

You must file an Indiana return if your income exceeds the state's filing threshold. The threshold changes each year and depends on your filing status and age. For the 2024 tax year, a single person under 65 must file if their income is above a certain amount set by the state. If you are over 65 or married, the threshold is higher.

You may need to file even if you do not owe federal income tax. Indiana uses its own rules for what counts as income and what deductions explore, so it is possible to owe Indiana tax while owing nothing to the federal government. If you are unsure whether you must file, the Indiana Department of Revenue website lists the current thresholds by filing status.

What income is subject to Indiana state tax

Indiana taxes wages, salaries, and tips from employment. It also taxes interest and dividend income, though Indiana offers a deduction for some types of investment income. Distributions from retirement accounts like 401(k)s and IRAs are generally taxable, but Indiana allows a deduction for certain retirement income if you meet age and income requirements.

Self-employment income is taxable in Indiana. If you run a business or work as a contractor, you owe state tax on your net profit. Capital gains—the profit you make when you sell an asset like stock or real estate—are taxed as ordinary income in Indiana, meaning they are subject to the 3.15 percent rate.

Some types of income are exempt. Social Security benefits are not taxed by Indiana. Certain military pensions and some government employee pensions may also be exempt or partially exempt, depending on when you earned them and your age.

How to adjust your withholding if too much or too little is being taken

Your employer withholds Indiana state tax from your paycheck based on the information you provide on Form IT-4, Indiana's withholding form. If you find that too much is being withheld and you receive a large refund each year, or if too little is being withheld and you owe money at tax time, you can adjust it.

Complete a new Form IT-4 and give it to your employer's payroll department. The form asks for your filing status, number of dependents, and any additional withholding you want. If you work multiple jobs or your spouse works, you may need to coordinate withholding across both employers to avoid under-withholding. Your employer must implement the change within a reasonable time, usually within one or two pay periods.

Filing your Indiana state return and where to send it

You file your Indiana state return using Form IT-1040 (the long form) or Form IT-1040EZ (the short form for straightforward situations). The short form is available if you have only wages, interest, and dividends and do not itemize deductions. Most people can file electronically through the Indiana Department of Revenue's website or through tax software that supports Indiana returns.

Indiana returns are due on the same date as federal returns—April 15 of the following year, or the next business day if April 15 falls on a weekend. You can request an extension, which gives you until October 15 to file. If you owe money, you should pay by the April 15 important date even if you request an extension, to avoid penalties and interest.

Mail paper returns to the Indiana Department of Revenue at the address listed on the form. If you file electronically, the return goes directly to the state's system. Keep a copy of your return and any supporting documents for your records.

Deductions and credits available to Indiana taxpayers

Indiana allows a standard deduction that reduces your taxable income. The amount varies by filing status and age. For 2024, a single person under 65 receives one standard deduction amount, while someone 65 or older receives a higher amount. Married couples filing jointly receive a larger deduction than single filers.

Indiana also offers several tax credits that reduce the tax you owe directly. The Earned Income Tax Credit (EITC) is available to low- and moderate-income workers and is based on federal EITC rules. Indiana offers a child and dependent care credit if you pay for care so you can work. Some taxpayers may also may have access to for a property tax credit or a renter's deduction, depending on income and other factors. Check the Indiana Department of Revenue website or your tax software to see which credits explore to your situation.

Frequently Asked Questions

Do I have to pay Indiana state tax if I work in Indiana but live in another state?

Yes, Indiana taxes income earned within the state. If you work in Indiana, your employer will withhold Indiana tax from your paycheck. You may also owe tax to the state where you live. Most states have reciprocal agreements or credits to prevent double taxation, so you typically will not pay the full rate to both states, but you should file returns in both and claim any credits available.

Is Social Security taxed by Indiana?

No. Indiana does not tax Social Security benefits. If Social Security is your only income, you do not need to file an Indiana return. However, if you have other income above the filing threshold, you must file even though the Social Security portion is not taxed.

What happens if I do not file an Indiana return when I am supposed to?

The Indiana Department of Revenue may assess penalties and interest on any tax owed. If you owe a refund, you generally have three years to claim it before the state keeps the money. If you realize you missed a year, you can file a late return. Contact the Indiana Department of Revenue to discuss your situation and any payment options.

Can I deduct federal income tax from my Indiana state tax?

No. Indiana does not allow a deduction for federal income tax paid. You calculate Indiana tax on your federal taxable income after explore the Indiana standard deduction, but you cannot reduce it further by the amount you paid to the federal government.

Do I need to file if I am retired and only have pension income?

It depends on the type of pension and your total income. Some pensions are exempt from Indiana tax, while others are taxable. If your taxable income exceeds the filing threshold, you must file. Review your pension statement or contact the Indiana Department of Revenue to determine whether your specific pension is taxable.