The mailing address for the Indiana Department of Revenue depends on what you are sending. The DOR uses more than two dozen P.O. Boxes in Indianapolis, each tied to a specific tax type, form, and whether payment is enclosed. Legal correspondence goes to a separate street address. Sending a return or payment to the wrong box can delay processing by weeks and may trigger late-payment penalties.
Individual Income Tax
Individual income tax mail splits by whether payment is enclosed. This is the most common source of misrouted mail.
- Return with payment (Form IT-40, IT-40PNR, or IT-40RNR): Indiana Department of Revenue, P.O. Box 7224, Indianapolis, IN 46207-7224
- Return with a refund or zero balance: Indiana Department of Revenue, P.O. Box 40, Indianapolis, IN 46206-0040
- Preprinted estimated tax vouchers: P.O. Box 7223, Indianapolis, IN 46207-7223
- Computer-generated estimated vouchers (Form IT-40ES): P.O. Box 7225, Indianapolis, IN 46207-7225
- Extension request (Form IT-9): P.O. Box 6117, Indianapolis, IN 46206-6117
- General individual income tax correspondence: P.O. Box 7207, Indianapolis, IN 46207-72071Indiana Department of Revenue. Mail in Tax Forms
Corporate and Business Tax
Business filers face an even wider spread, and the differences between boxes can be subtle. The correct address turns on entity type, the specific form, and whether payment is enclosed.
Corporate Income Tax
- Form IT-20 or IT-20X with payment: P.O. Box 7087, Indianapolis, IN 46207-7087
- Form IT-20 or IT-20X without payment: P.O. Box 7231, Indianapolis, IN 46207-7231
- Form IT-6 estimated quarterly vouchers: P.O. Box 6032, Indianapolis, IN 46207-7226
- Corporate correspondence: P.O. Box 7206, Indianapolis, IN 46207-72061Indiana Department of Revenue. Mail in Tax Forms
Corporate estimated vouchers (IT-6) go to P.O. Box 6032, which is not the same box as any of the individual estimated payment addresses.
S Corporations and Partnerships
- Form IT-20S with payment: P.O. Box 7205, Indianapolis, IN 46207-7205
- Form IT-20S without payment: P.O. Box 7147, Indianapolis, IN 46207-7147
- Form IT-65 partnership return without payment: P.O. Box 7147, Indianapolis, IN 46207-7147
Sales Tax
Sales tax returns on Form ST-103 go to P.O. Box 7218, Indianapolis, IN 46207-7218, separate from every corporate income tax box.1Indiana Department of Revenue. Mail in Tax Forms
Withholding Tax
Employer withholding filings also split across multiple boxes, including the annual reconciliation, which routes differently depending on whether a refund is claimed.
- Form WH-1 (monthly withholding return): P.O. Box 7221, Indianapolis, IN 46207-7221
- Form WH-1U: P.O. Box 6192, Indianapolis, IN 46206-6192
- Form WH-3 with refund claimed: P.O. Box 7220, Indianapolis, IN 46207-7220
- Form WH-3 with no refund due: P.O. Box 6108, Indianapolis, IN 46206-6108
- Withholding correspondence: P.O. Box 7222, Indianapolis, IN 46207-72221Indiana Department of Revenue. Mail in Tax Forms
Motor Carrier and Fuel Tax
- IFTA (interstate): P.O. Box 6175, Indianapolis, IN 46206-6175
- Intrastate fuel: P.O. Box 6081, Indianapolis, IN 46206-6081
- Fuel tax returns, bonds, and licensing: P.O. Box 6080, Indianapolis, IN 46206-6080
Power of Attorney
Form POA-1 has its own address: P.O. Box 7230, Indianapolis, IN 46207-7230. You can also fax it to 317-615-2605 or attach it as a PDF through the INTIME portal. It does not need to be notarized.2Indiana Department of Revenue. Power of Attorney
Legal Correspondence, Protests, and Appeals
Mail that is not a return or payment, such as legal notices, formal protests, appeals, or general information requests, goes to the DOR’s administrative street address:
Indiana Department of Revenue
Attn: Legal Division
100 N Senate Avenue, MS 102
Indianapolis, IN 462043Indiana Department of Revenue. Contact Us
Do not send tax returns or payments to the Senate Avenue address. They sit in an internal rerouting queue before reaching the correct P.O. Box, and a deadline can pass in the meantime. Use a P.O. Box for any transactional filing and the street address only for legal or administrative matters.
Mailing Deadlines and Postmarks
Indiana uses the postmark date to decide whether a mailed return or payment is timely. A change in how the U.S. Postal Service applies postmarks means the automated postmark may reflect the date of first processing rather than the day you dropped the envelope in a box, which could be several days later.
If you are mailing close to a deadline, the DOR recommends three protections. Take the envelope to a USPS retail counter and ask for a manual local postmark. If that is not possible, mail the item at least one week before the deadline. Consider Certified Mail so you have a dated receipt as proof.4IN.gov. USPS Postmark Change
In-Person Offices
Three DOR district offices accept walk-ins Monday through Friday, 8:00 a.m. to 4:30 p.m. local time:
- Indianapolis: 100 N. Senate Ave., IGCN, Rm N105, Indianapolis, IN 46204
- Clarksville: 1200 Madison St., Ste. E, Clarksville, IN 47129
- Merrillville: 1411 E. 85th Ave., Merrillville, IN 464105Indiana Department of Revenue. District Offices
Other district offices around the state are appointment-only. You can book online through the DOR’s appointment page, or call 317-232-2240 for individual and business matters or 317-615-7200 for motor carrier services.6Indiana Department of Revenue. In-Person Appointments
Filing Electronically Instead
For most routine filings, you can skip the mail entirely. The DOR’s INTIME portal handles returns, payments, refund status, account balances, notice responses, and secure messages for individuals and businesses. Business users can also register accounts and set up payment plans through the portal.7Indiana Department of Revenue. INTIME Information