To do an Indiana tax ID number lookup for your own business, log into the state’s INTIME portal and your Taxpayer Identification Number (TID) will appear on the dashboard, or call the Indiana Department of Revenue at 317-232-2240 and verify your identity over the phone. There is no public database that returns another business’s TID; Indiana treats the number as confidential tax account information.
Make Sure You’re Looking for the Right Number
Indiana businesses carry two separate tax identification numbers from two different agencies, and people often go looking for one when they actually need the other.
The Indiana TID is a ten-digit number followed by a three-digit location code, assigned by the Department of Revenue (DOR) when you register your business with the state. It appears on your Registered Retail Merchant Certificate and is what you use to remit Indiana sales tax, state income tax withholding, and corporate adjusted gross income tax. It is tied to each physical business location.
The Federal Employer Identification Number (EIN) is a nine-digit number issued by the IRS for federal tax returns, business bank accounts, and payroll.1Internal Revenue Service. Employer Identification Number You generally need the EIN before you can apply for a state TID, but the two numbers are not interchangeable and live in separate systems.2Indiana Department of Revenue. Business Tax Application Checklist
If you’re not sure which one you’ve lost, check what you were going to do with it. Filing a state sales tax return or communicating with the DOR? That’s your TID. Anything federal, or opening a bank account? That’s the EIN.
Finding Your Indiana TID Through INTIME
Indiana’s online tax system is called INTIME (Indiana Taxpayer Information Management Engine), and it replaced the older INtax system.3Indiana Department of Revenue. INTIME Guide for Business Tax Customers If you already have an INTIME login, sign in and your TID displays on the dashboard alongside every registered tax account. The same portal lets you file returns, send secure messages to DOR staff, and pull return transcripts, so it’s the fastest route in almost every case.
If you never set up an INTIME account, you’ll first need to register your business through INBiz, Indiana’s one-stop registration system.4Indiana Department of Revenue. Register a Business Once your INBiz registration is on file, you can create an INTIME login and pull up your tax records.
Getting Your TID From the DOR by Phone or Letter
When INTIME isn’t an option, call the DOR’s business tax line at 317-232-2240, Monday through Friday from 8:00 a.m. to 4:30 p.m. Eastern.5Indiana Department of Revenue. Contact Us The representative will ask you to confirm details like the business’s legal name, the address on file, and your federal EIN before releasing the number. A recent federal return in front of you makes the call go faster.
Some accounts, particularly older ones that predate electronic registration, require a written request on company letterhead signed by an authorized officer. Written requests take longer, and the DOR sends its response either through a secure message in INTIME or as a letter mailed to the business address on file. The department will not release a TID over standard email.
Only someone tied to the account can request it. That means the owner, a corporate officer, or a person with a valid power of attorney on file.
If You Actually Lost Your Federal EIN
If it turns out your missing number is the federal EIN, the IRS runs its own recovery process.1Internal Revenue Service. Employer Identification Number A few places to check first:
- The original IRS confirmation letter (CP-575) mailed when the EIN was first assigned.
- Your business bank, which keeps the EIN on file for your account.
- Any past federal business tax return; the EIN prints on every one.
- An entity transcript ordered through your IRS online account.
If none of those turn it up, call the IRS Business and Specialty Tax Line at 800-829-4933, Monday through Friday from 7:00 a.m. to 7:00 p.m. local time. After verifying your identity, the representative can read the number over the phone or fax a replacement confirmation letter (called a 147C letter). The IRS releases the EIN only to the owner, a corporate officer, or someone with a valid power of attorney.
Looking Up Another Business’s Indiana Tax Status
Vendors, contractors, and suppliers sometimes want to confirm that an Indiana business they’re dealing with is actually registered to collect sales tax. Indiana does not publish other companies’ TIDs, but it does publish two useful public tools.
The DOR maintains a Tax-Delinquent Business Look-Up that lists retail merchants whose Registered Retail Merchant Certificates have been revoked for nonpayment or unfiled returns.6Indiana Department of Revenue. Tax-Delinquent Business Look-Up Finding a company on that list is a serious red flag: the state has pulled its authorization to collect sales tax.
The tool has a real limitation, though. It only shows businesses in trouble on the sales tax side. A company that doesn’t appear on the delinquent list is probably fine, but not necessarily; a business that only owes corporate income tax and doesn’t sell taxable goods would never show up here regardless of its standing. And the tool doesn’t reveal the actual TID.
If you genuinely need another business’s TID for a specific transaction, ask the business. Companies routinely share their TID on exemption certificates like the Indiana ST-105 when making tax-exempt purchases.
Cross-Checking With the Secretary of State
The Indiana Secretary of State (SOS) maintains a separate public database covering the legal standing of every entity registered in the state. That’s a different question from tax compliance, and both checks together give you a more reliable picture.7Indiana Secretary of State. Business Search
The SOS Business Entity Search lets you look up corporations, LLCs, partnerships, and other entity types by name, business ID, or filing number. A status of “Active” means the entity is current on its state administrative filings and fees. “Admin Dissolved” or “Revoked” means it has fallen behind and may not be legally authorized to transact business.
The SOS database does not display any tax identification numbers, and it does not sync in real time with the DOR. A business can show “Active” with the Secretary of State while its sales tax certificate has been revoked by the Department of Revenue, so running both searches is the safer approach when you’re vetting a vendor.