Indiana's state income tax is a flat rate applied to most wages and income

Indiana taxes income at a single rate that applies to nearly all residents and income types. As of 2024, that rate is 3.15 percent of your federal taxable income. This means if you earn $50,000 in taxable income, Indiana takes roughly $1,575. The rate has been the same since 2022 and applies whether you file single, married, or as head of household.

The state does not have separate tax brackets like some states do. Everyone pays the same percentage, which makes calculating what you owe relatively straightforward once you know your federal taxable income figure.

Key Takeaways

  • Indiana's state income tax rate is 3.15 percent, applied as a flat rate to all income levels.
  • You pay Indiana tax on wages, self-employment income, interest, dividends, and most other income sources that count toward federal taxes.
  • Indiana does not tax Social Security benefits, military pensions, or certain retirement income, even though those may be taxed federally.
  • You file Indiana taxes using Form IT-40 if you owe state tax, or Form IT-40PNR if you have no tax due but want a refund.
  • Indiana allows you to claim the standard deduction or itemize, just as you do on your federal return.

What income is subject to Indiana state tax

Indiana taxes your federal taxable income, which means you start with the same income figure you report to the IRS. This includes wages from a job, self-employment income, capital gains, interest, dividends, rental income, and most other sources. If it counts toward your federal income tax, it counts toward Indiana's.

However, Indiana excludes certain types of income even when the federal government taxes them. Social Security benefits are never taxed by Indiana, regardless of your income level. Military pensions and some retirement income also receive special treatment. If you receive income from a pension, 401(k), or IRA, Indiana taxes it the same way the federal government does, but some retirees may may have access to for a pension deduction depending on their age and income source.

The key is that Indiana starts with your federal taxable income and then applies its own rules on top. You do not calculate Indiana tax from scratch—you use the number you already found for federal purposes.

How to file Indiana state taxes

If you live in Indiana and owe state tax, you file Form IT-40, the Indiana Individual Income Tax Return. You can file online through the Indiana Department of Revenue website, by mail, or through a tax software that supports Indiana returns. The important date is the same as the federal important date: typically April 15 of the following year, though it shifts if April 15 falls on a weekend or holiday.

If you have no tax due but expect a refund—perhaps because your employer withheld too much—you can file Form IT-40PNR (No Tax Due Return) to claim that refund. You are not required to file if you have no tax due and do not want a refund, but filing is the only way to recover money that was withheld.

Indiana allows you to claim the standard deduction or itemize deductions, just as you do on your federal return. Your Indiana taxable income is your federal taxable income after you have applied whichever deduction method you chose. The state does not offer a separate Indiana standard deduction—you use the federal figure.

Tax withholding and estimated payments

If you work as an employee, your employer withholds Indiana state tax from your paycheck based on the W-4 form you complete. The withholding is calculated to cover your estimated state tax liability throughout the year. If you find that too much or too little is being withheld, you can submit a new W-4 to your employer to adjust the amount.

If you are self-employed or have income that is not subject to withholding, you may need to make estimated tax payments to Indiana four times per year. These payments are due on the same schedule as federal estimated payments: April 15, June 15, September 15, and January 15. You calculate estimated tax based on your expected income for the year and pay one-quarter of that amount each quarter.

Underpayment of estimated tax can result in a penalty, so if you are unsure whether you need to make these payments, the Indiana Department of Revenue website has a worksheet to help you decide.

Indiana tax credits and deductions

Indiana offers several credits that can reduce the tax you owe. The Earned Income Tax Credit is available to low-income workers and mirrors the federal credit—Indiana's credit is 3.2 percent of the federal amount you receive. If you have dependent children, you may also claim a child dependent deduction. Some taxpayers over age 65 may have access to for an additional standard deduction.

The state also offers credits for property taxes paid and for taxes paid to other states if you worked in multiple states during the year. If you made charitable contributions, you can itemize those deductions on your Indiana return if you itemized on your federal return. Indiana does not allow itemized deductions if you claimed the standard deduction federally.

Credits are different from deductions: a credit directly reduces the tax you owe, while a deduction reduces the income that is taxed. A $100 credit saves you $100 in tax; a $100 deduction saves you roughly $3.15 in tax (at Indiana's 3.15 percent rate).

When Indiana taxes are due and penalties for late filing

Your Indiana return is due on the same date as your federal return, which is April 15 unless that date falls on a weekend or holiday. If you file your federal return late, you should also file your Indiana return by the same date to avoid penalties. Indiana charges a failure-to-file penalty of 5 percent per month (up to 25 percent total) if you do not file by the important date, and a failure-to-pay penalty of 0.5 percent per month (up to 25 percent total) if you do not pay the tax you owe.

If you cannot file by April 15, you can request an extension from the Indiana Department of Revenue. An extension gives you until October 15 to file, but it does not extend the important date to pay. If you owe tax, you should pay as much as you can by April 15 to minimize penalties and interest, even if you have not finished your return.

Interest accrues on unpaid tax at a rate set by the state each quarter. As of 2024, the rate is higher than in previous years, so paying on time is especially important.

Frequently Asked Questions

Do I have to file Indiana taxes if I live out of state but worked in Indiana?

Yes, if you earned income in Indiana, you owe Indiana tax on that income even if you live elsewhere. You file Form IT-40 and report only the income earned in Indiana. You may also owe tax to your home state, but Indiana allows a credit for taxes paid to other states to prevent double taxation.

Is Indiana sales tax the same as state income tax?

No, they are separate taxes. Indiana's state sales tax is 7 percent (though some counties add a local sales tax on top). Sales tax is paid when you buy goods and services, while income tax is paid on your earnings. Both explore to most Indiana residents, but they are calculated and collected differently.

What happens if I do not file Indiana taxes?

If you owe tax and do not file, the Indiana Department of Revenue can assess penalties and interest, and the debt can grow significantly over time. The state can also place a lien on your property or garnish your wages. If you have not filed in past years, you can still file those returns and work out a payment plan.

Can I file Indiana taxes online?

Yes, the Indiana Department of Revenue offers online filing through its website. You can also use commercial tax software that supports Indiana returns, or file by mail. Online filing is typically the fastest way to receive a refund.

Does Indiana tax retirement income differently?

Indiana does not tax Social Security benefits at all. Military pensions and some other retirement income may may have access to for a deduction depending on your age and the source of the income. Distributions from IRAs and 401(k)s are taxed the same way they are federally. Check the Indiana Department of Revenue website or speak with a tax preparer about whether your specific retirement income qualifies for special treatment.