There are three ways to pay Indiana state taxes: online through the state’s INTIME portal, by mail with a check or money order, or in person at a Department of Revenue district office. Individual income tax returns and any balance owed for the 2025 tax year are due April 15, 2026. Indiana’s flat state income tax rate is 2.95% for 2026, and most residents also owe a county income tax that runs roughly 0.5% to 3.0% depending on where they live.1Indiana Department of Revenue. How to Compute Withholding for State and County Income Tax2Indiana Department of Revenue. Indiana County Income Tax Rates and County Codes The county portion is reported and paid on the same Form IT-40, so there is no separate county payment to make.
What to Have Ready Before You Pay
Have your Social Security Number (or ITIN), your completed return or tax notice, and the exact amount you owe. If you’re making an estimated quarterly payment by mail, use Form ES-40. Corporations making estimated payments use Form IT-6.3Indiana Department of Revenue. DOR: Current Year Individual Tax Forms4Indiana Department of Revenue. Indiana Form E-6, Estimated Quarterly Income Tax Returns
Paying Online Through INTIME
INTIME, the Indiana Taxpayer Information Management Engine, is the fastest option and doesn’t require an account for a one-time payment. From the INTIME homepage, select “Make a payment,” choose your tax type (individual income tax, for example), enter your identifying details, and pick a payment method.5Indiana Department of Revenue. Make a Tax Bill Payment Without Logging In to INTIME
Two methods are accepted:
- Electronic bank payment (ACH) using your routing and account numbers. No fee.
- Credit or debit card (Visa, Mastercard, Discover). A convenience fee of $1.00 plus 1.99% of the payment applies.6Indiana Department of Revenue. INTIME for Individual Income Tax Customers
Once you submit, INTIME displays a confirmation number. Print or save that screen. It’s your official proof of payment, with the transaction date and time.
Paying by Mail
Write your check or money order payable to the Indiana Department of Revenue. Put your Social Security Number and the tax year in the memo line so the payment can be matched to your account if it gets separated from the paperwork. Don’t staple or paper-clip the check to your return or voucher, since that interferes with automated processing.
Send payments with your return to:
Indiana Department of Revenue
P.O. Box 7224
Indianapolis, IN 46207-72247Indiana Department of Revenue. DOR: Contact Us
The envelope must be postmarked by April 15, 2026, to avoid late-payment interest, which accrues at 7% annually for 2026.8Indiana Department of Revenue. Interest Rates for Calendar Year 2026 Mailed checks generally take seven to ten business days to process after the DOR receives them. If the deadline is tight, use a trackable mailing service so you have proof of the postmark.
Paying in Person at a District Office
Three DOR district offices take walk-ins Monday through Friday, 8:00 a.m. to 4:30 p.m. local time:9Indiana Department of Revenue. DOR: District Offices
- Clarksville
- Indianapolis
- Merrillville
Eight more offices are open by appointment only, two days a week each: Columbus, Evansville, Fort Wayne, Kokomo, Lafayette, Muncie, South Bend, and Terre Haute.
District offices accept exact cash, checks, money orders, and debit or credit cards. Bring your completed return or notice, your Social Security Number, and a valid photo ID. Staff process the payment while you wait and give you a receipt. That immediate receipt is useful if you’re clearing a delinquent balance or resolving a tax warrant.
Estimated Quarterly Payments
If you expect to owe $1,000 or more in combined state and county income tax after withholding and credits, you need to make quarterly estimated payments.10Indiana Department of Revenue. DOR: Estimated Payments This most often affects the self-employed, freelancers, and people with significant investment income.
The 2026 quarterly due dates are:11Indiana Department of Revenue. Estimated Tax Payment Form
- 1st installment: April 15, 2026
- 2nd installment: June 15, 2026
- 3rd installment: September 15, 2026
- 4th installment: January 15, 2027
Pay online through INTIME (free by bank transfer) or mail Form ES-40 with a check.
If You Can’t Pay in Full
The DOR offers installment agreements through INTIME. Individuals who owe more than $100 and businesses that owe more than $500 can set up a plan online without calling.12Indiana Department of Revenue. INTIME Quick Guide – Set Up a Payment Plan Balances of $5,001 or more can be spread over up to 36 months.13Indiana Department of Revenue. Payment Plans Interest keeps accruing at 7% on the unpaid balance during the plan, so paying faster costs less.
Extensions Don’t Extend the Payment Deadline
An Indiana filing extension gives you until November 16, 2026 to file the return, but the tax itself is still due April 15, 2026.14Indiana Department of Revenue. Extension of Time to File Interest starts running on any unpaid balance after April 15. The late-filing penalty is waived if you meet both of these conditions:
- Pay at least 90% of the tax owed by April 15, 2026.
- Pay the remaining balance, including interest, by November 16, 2026.
Penalties and Interest for Late Payment
Late or underpaid tax triggers two charges. The DOR adds interest at 7% per year on any balance owed after the due date.8Indiana Department of Revenue. Interest Rates for Calendar Year 2026 A 10% penalty also applies in several situations, including failing to file, paying less than the full amount shown on your return, or a deficiency caused by negligence.15Indiana General Assembly. Indiana Code 6-8.1-10-2.1 – Liability for Penalty; Reasonable Cause Presumption The penalty and interest can apply to the same unpaid balance, so paying on time is by far the cheapest option.