Indiana collects state income tax on wages, and the rate is flat across all income levels

Yes, Indiana has a state income tax. The current rate is 3.15 percent of your federal taxable income, and it applies the same way regardless of how much you earn. This is a flat tax, meaning a person earning $30,000 pays the same percentage as someone earning $300,000.

The tax is withheld from paychecks by your employer, similar to federal income tax. If you are self-employed, you pay it through estimated quarterly payments or when you file your annual return. Indiana residents who work in other states may owe tax to both Indiana and the state where they work, though Indiana has reciprocal agreements with some neighboring states to prevent double taxation.

Key Takeaways

  • Indiana's state income tax rate is a flat 3.15 percent on federal taxable income, with no brackets or higher rates for higher earners.
  • Your employer withholds Indiana income tax from your paycheck automatically, just as they do for federal tax.
  • If you work in another state, you may owe income tax to both Indiana and that state, though reciprocal agreements can reduce or eliminate the Indiana tax in some cases.
  • Self-employed people and business owners pay Indiana income tax through quarterly estimated payments or when filing their annual return.
  • Indiana also taxes business income, capital gains, and certain types of retirement income, though some retirement income has special treatment.

How the 3.15 percent rate is calculated

Indiana starts with your federal taxable income—the number you report on your federal tax return after deductions and exemptions. The state then applies 3.15 percent to that figure. You do not calculate a separate Indiana taxable income; the state uses the federal number as its starting point.

Because Indiana uses a flat rate, there are no tax brackets. A single filer earning $50,000 and another earning $150,000 both pay exactly 3.15 percent on their respective incomes. The only variation comes from deductions and credits specific to Indiana, which are fewer than federal deductions.

What income is subject to Indiana tax

Indiana taxes wages, salaries, self-employment income, business profits, capital gains, and interest and dividend income. If you receive a W-2 from an employer, that income is taxed. If you own a business or sell an investment at a profit, that income is taxed.

Some types of income receive special treatment. Social Security benefits are not taxed by Indiana. Certain retirement income, including distributions from traditional IRAs and 401(k)s, may be partially exempt if you meet age and income requirements—generally, if you are 59½ or older and your income falls below a threshold, some or all of your retirement distributions may not be taxed. Military pensions also have an exemption. You should check the current rules or speak with a tax professional if you receive retirement income, because these exemptions change periodically.

Withholding and estimated payments

If you are an employee, your employer withholds Indiana income tax based on the W-4 form you complete. The withholding is sent to the Indiana Department of Revenue on your behalf. Most people have enough withheld during the year so that they do not owe additional tax when they file their return in April.

If you are self-employed or have income not subject to withholding, you are responsible for paying estimated tax quarterly. These payments are due on April 15, June 15, September 15, and January 15 of the following year. If you do not pay enough throughout the year, you may owe a penalty when you file your return, even if you ultimately do not owe additional tax.

Working in another state while living in Indiana

If you live in Indiana but work in another state, you typically owe income tax to the state where you work. Indiana has reciprocal tax agreements with Kentucky, Illinois, Michigan, and Ohio. These agreements generally mean you do not owe Indiana income tax on wages earned in those states, as long as you live in Indiana and work across the border.

If you work in a state with which Indiana has no reciprocal agreement, you may owe tax to both Indiana and that state. Indiana allows a credit for taxes paid to other states, which reduces your Indiana tax liability, but you may still owe something to Indiana. The specifics depend on the other state's rules and your personal situation. A tax professional can help you understand your obligations if you work out of state.

Filing your Indiana return

Indiana residents file Form IT-40, the state income tax return, by April 15 each year. You can file electronically through the Indiana Department of Revenue website or by mail. If you owe money, payment is due by April 15. If you are due a refund, filing electronically usually results in faster processing.

You must file a return if your income exceeds the filing threshold, which varies by filing status and age. Even if you do not owe tax, filing may be worth doing if you had taxes withheld during the year, because you would receive a refund. The Indiana Department of Revenue website has worksheets to help you determine whether you must file.

Indiana tax credits and deductions

Indiana offers fewer deductions and credits than the federal government does. The state does not allow a standard deduction the way federal tax does; instead, Indiana uses your federal taxable income as the starting point. However, Indiana does offer credits for certain situations, such as property tax paid on a home you own, child and dependent care expenses, and education-related costs.

Some credits are refundable, meaning you can receive money back even if you owe no tax. Others are nonrefundable, meaning they can only reduce the tax you owe. The value and availability of credits change year to year, so check the Indiana Department of Revenue website or consult a tax professional to see which credits explore to your situation.

Frequently Asked Questions

Does Indiana tax retirement income like Social Security?

No, Social Security is not taxed by Indiana. However, distributions from IRAs, 401(k)s, and pensions may be taxed unless you meet certain age and income requirements. If you are 59½ or older, some or all of your retirement distributions may be exempt. Check the current rules or speak with a tax professional about your specific situation.

What happens if I move out of Indiana during the year?

You owe Indiana income tax only on income earned while you were a resident. When you move, you become a resident of your new state and owe tax there on income earned after the move. You file a part-year resident return in Indiana showing only the income earned while you lived there. Your new state may also require a part-year return.

Can I deduct federal income tax paid on my Indiana return?

No, Indiana does not allow a deduction for federal income tax paid. You calculate Indiana tax based on your federal taxable income, but you cannot reduce that income further by the amount of federal tax you owe.

Is there a penalty for not paying estimated tax if I am self-employed?

Yes, if you do not pay enough estimated tax throughout the year, the Indiana Department of Revenue may assess a penalty and interest on the unpaid amount. The penalty is calculated based on how much you underpaid and how late the payment was. Paying quarterly estimates on time avoids this penalty.

Where do I send my Indiana income tax payment?

If you file electronically, you can pay online through the Indiana Department of Revenue website. If you file by mail, include a check with your return and mail it to the address shown on the form. Paying online is faster and reduces the risk of your payment being lost in the mail.