Indiana · Sales tax registration
Indiana sales tax registration, done for you.
Form BT-1, the Business Tax Application, opens an Indiana sales tax account alongside withholding if you need both. The reason to be deliberate about what you tick is that Indiana treats an unused account as an active one and sends bills for estimated taxes rather than reminders.
Last updated:
Who you are dealing with
Indiana Department of Revenue
- Handles:
- Sales tax and other business trust tax accounts, including withholding, on one application
- System:
- INTIME
- Form:
- Form BT-1, the Business Tax Application. In INTIME choose New Tax Registration then Register a new business tax account
- Phone:
- 317-232-2240, Monday to Friday 08:00 to 16:30 ET
State fee. $0 to register. The cost in Indiana is on the other side: an account left open can attract bills for estimated taxes, which are real liabilities rather than notices.
Our fee. $180 per state, flat. State fees are passed through at cost.
When you have to register
Register before making taxable retail sales in Indiana. A seller with no Indiana location registers for the same registered retail merchant's certificate, once gross revenue from sales into Indiana passes $100,000 in the previous or the current calendar year. That counts tangible personal property, digital products and services delivered into Indiana. Note the date on any guidance you read elsewhere: from January 1, 2024 Indiana has only the $100,000 threshold, and the old 200 transaction test is gone, so a seller who crossed on transaction count alone under the old rule may no longer be liable. Sales tax here is a trust tax, money collected on the state's behalf, which is why Indiana escalates faster on it than states that treat a dormant account as an administrative loose end.
What comes next
This is the reason to register narrowly. Indiana states that if the account is not closed on INTIME and no BC-100 is filed, the Department of Revenue may continue to send bills for estimated taxes.
How long it takes
Indiana does not publish a turnaround we could confirm. INTIME is the route that leaves you a record, where a paper application does not.
What we do
We work out which accounts you need, submit each registration, and hand you the account numbers, rates, and deposit schedules your payroll system asks for. One flat price per state, and any state fee passed through at cost. You keep the client. We never email them.
What makes Indiana harder than average
- An unused account is not harmless here. Most states send a notice asking for a return. Indiana may assess estimated tax, which then has to be resolved by filing the actual returns rather than ignored.
- One application covers several trust taxes. BT-1 can open sales tax and withholding together. Convenient if you need both, and a liability if you tick one speculatively.
- Trust tax framing changes the tone. Sales tax you collect was never yours, and Indiana's guidance and enforcement reflect that. It is not a state to be casual with.
- Do not mail and fax the same closure form later. Indiana says so explicitly for the BC-100, which suggests enough people have done it. Worth knowing the habit now.
How Indiana compares
If Indiana is one of several states on the list, the order you register in changes what each one asks for.
Questions and answers
Should I register for extra Indiana tax types while I am there?
No. Indiana may send bills for estimated taxes on an account that is left open, so an unnecessary registration creates a real liability rather than an unused login.
Does BT-1 cover payroll withholding too?
It can. BT-1 covers Indiana business trust tax accounts, which includes sales tax and withholding. Unemployment insurance is separate at the Department of Workforce Development.
Is there a fee?
No fee to register. What costs money is leaving an account open after you stop using it.
How long does it take?
Indiana does not publish a turnaround we could verify with the agency. Commercial guides quote figures we have not confirmed, so we will not repeat them.
What do you need from me to start?
The legal name and FEIN, entity type, Indiana locations, what you sell, the date taxable sales begin, and whether you also need withholding.
Also in Indiana
Agency details verified 2026-08-03
About the provider
Regcrest LLC is a document preparation and filing service based in Allentown, Pennsylvania, founded in 2026. It prepares and files state payroll and sales tax registrations, account closures, and resale certificates on behalf of the businesses that instruct it, and works behind accounting firms, bookkeepers, and payroll providers as well as directly with businesses.
Regcrest LLC is not a CPA firm and not a law firm. It gives no tax or legal advice. It files in all 50 states, and publishes a full page for the 29states it has verified against the agency's own material so far, each one showing the date it was checked. For anything that turns on your specific situation, ask a licensed accountant or attorney.