To pay Indiana state taxes, you have three options: pay online through the Department of Revenue’s INTIME portal, mail a check or money order to the correct DOR address, or pay in person at a district office. An electronic bank payment through INTIME is free and posts quickly, which makes it the default choice for most people. Mail works if you want a paper trail, and in-person visits make sense when you also need to ask questions.
Pay Online Through INTIME
INTIME (Indiana Taxpayer Information Management Engine) is the state’s online tax portal. You can use it for individual income tax, business tax, estimated installments, and outstanding balances. No account is required for a one-time payment: select “Make a Payment” on the INTIME homepage and follow the prompts.1Indiana Department of Revenue. INTIME
Two payment types are accepted. An electronic bank payment (ACH or e-check) costs nothing extra and only needs your bank routing and account numbers. Visa, MasterCard, and Discover cards are also accepted, but they carry a processing fee of $1 plus 1.99% of the payment amount.2Indiana Department of Revenue. INTIME User Guide for Individual Income Tax Customers On a $2,000 bill, that card fee comes to about $41, so e-check is the cheaper route unless credit card rewards outpace the surcharge.
Have your Social Security number ready to identify yourself during checkout. INTIME also lets you schedule a future-dated withdrawal, which is useful when a deadline is close and you want the money to leave your account on a specific day.
Pay by Mail
You can mail a check or money order payable to “Indiana Department of Revenue.” Write your Social Security number (or tax identification number) and Letter ID on the memo line so DOR can match the payment to your account.4Indiana Department of Revenue. Payments and Billing
The address depends on what you are paying. If you are paying a balance due with your IT-40 return, use:
Indiana Department of Revenue
P.O. Box 7224
Indianapolis, IN 46207-72243Indiana Department of Revenue. IT-40 Full Year Resident Individual Income Tax Booklet
If you are paying on a bill, notice, or tax lien, use:
Indiana Department of Revenue
P.O. Box 595
Indianapolis, IN 46206-05955Indiana Department of Revenue. Payments and Billing
For quarterly estimated tax, use Form ES-40 as your payment voucher and mail it with your check. The form is available on the DOR website and through most tax preparation software.6Indiana Department of Revenue. Estimated Payments
One practical tip: send tax payments by USPS Certified Mail. The receipt proves the date you mailed the payment, and a timely postmark counts as timely payment. Keep the receipt, because the Postal Service does not store copies.7USPS. Mail Your Tax Return With USPS
Pay in Person at a District Office
Indiana has eleven DOR district offices, but only three accept walk-in visitors: Indianapolis, Merrillville, and Clarksville. Those three are open Monday through Friday, 8 a.m. to 4:30 p.m. local time. The other eight (Columbus, Evansville, Fort Wayne, Kokomo, Lafayette, Muncie, South Bend, and Terre Haute) are appointment-only and typically see visitors just two days per week.8Indiana Department of Revenue. District Offices
District offices accept cash (bring exact change), checks, money orders, and debit or credit cards. Card payments in person carry the same processing fee as online card payments. Even at the walk-in offices, booking an appointment ahead of time will shorten your wait.
If You Can’t Pay in Full
Indiana offers installment agreements through INTIME. The minimum balance to qualify is $101 for individuals and $501 for businesses; anything at or below those thresholds has to be paid in full.9Indiana Department of Revenue. Payment Plans
How long you have depends on how much you owe:
- $101 to $1,000 for individuals, or $501 to $1,000 for businesses: up to 12 months
- $1,001 to $5,000: up to 24 months
- $5,001 and above: up to 36 months9Indiana Department of Revenue. Payment Plans
You can choose monthly or biweekly installments when you set up the plan.10Indiana Department of Revenue. INTIME Quick Guide – Set Up a Payment Plan Interest and penalties keep accruing on the unpaid portion while the plan runs, so paying it down faster saves money.
Deadlines That Affect Your Payment
The annual Indiana income tax return (Form IT-40) is due April 15, 2026, for tax year 2025, the same date as the federal deadline.11Internal Revenue Service. IRS Opens 2026 Filing Season Any balance you owe must be paid by that date, even if you request an extension to file.
If you are self-employed or have income that is not subject to withholding, you likely need to make quarterly estimated payments through INTIME or by mailing Form ES-40. For tax year 2026 those installments are due:
- April 15, 2026
- June 15, 2026
- September 15, 2026
- January 15, 2027
When a due date falls on a weekend or holiday, it shifts to the next business day.6Indiana Department of Revenue. Estimated Payments
An extension to file is not an extension to pay. If you request more time (through INTIME, by filing Form IT-9, or by filing a federal extension, which Indiana recognizes automatically), you have until November 16, 2026, to submit the return. Interest still starts running on any unpaid balance after April 15. The late-payment penalty is waived only if you pay at least 90% of what you owe by April 15 and the remaining balance plus interest by November 16.12Indiana Department of Revenue. Extension of Time to File Falling short of 90% triggers the penalty on top of the interest, so a slight overpayment by April 15 is the safer play.
What a Late Payment Costs
Indiana’s failure-to-pay penalty is 10% of the unpaid tax, or $5, whichever is greater.13Indiana Department of Revenue. Rates, Fees and Penalties It also applies if you were required to pay electronically but used another method. Interest accrues separately on top of the penalty and runs from the original due date until the balance is paid in full.
On a $3,000 balance, the penalty alone is $300 before any interest. That is the practical reason to meet the 90% prepayment rule during an extension and to open a payment plan promptly if you cannot pay in full, rather than letting a bill sit.