Indiana Sales Tax Guide for Business Owners: Rates, Nexus, Exemptions, and Filing

Indiana sales tax is straightforward in one sense and easy to miss in another: the state charges a flat 7% sales tax, but the rules around registration, exemptions, use tax, and remote seller compliance still matter for every business that sells taxable goods into Indiana.

If you are forming a new company, opening a retail location, or expanding an online store into Indiana, understanding the sales tax rules early can help you avoid penalties, late filings, and unnecessary compliance problems. This guide explains what is taxable, who must register, how to collect and remit tax, and which records to keep.

What Indiana Sales Tax Applies To

Indiana sales tax generally applies to the retail sale of tangible personal property. In practical terms, that includes most physical goods sold to customers in the state.

Indiana does not generally impose sales tax on services, but there are important exceptions. Some specific services, bundled transactions, and industry-specific charges can still be taxable depending on the statute and how the transaction is structured.

Common examples of items that may be exempt from sales tax include:

• Purchases for resale with a valid exemption certificate
• Certain manufacturing inputs
• Some agricultural items and production inputs
• Some medical and prescription-related purchases
• Qualified purchases by nonprofits and government entities

Because exemptions are fact-specific, the safest approach is to verify the transaction before treating it as exempt.

Who Must Collect Indiana Sales Tax

You generally need to collect Indiana sales tax if your business is:

• Located in Indiana and selling taxable goods
• Operating a retail location in Indiana
• Making taxable online sales to Indiana customers
• Meeting Indiana's remote seller threshold even without a physical presence in the state

For remote sellers, Indiana's economic nexus rule applies when gross revenue from sales into Indiana exceeds $100,000 in the current calendar year or the previous calendar year. The threshold applies whether or not the sales are taxable.

If you sell through a marketplace, note that marketplace sales are treated differently for threshold purposes. Indiana remote seller guidance says a seller's marketplace sales to Indiana customers are not included in the seller's own calculation of the $100,000 threshold when the marketplace facilitator is handling those sales.

Registering for Sales Tax in Indiana

Before you collect tax, you must register with the Indiana Department of Revenue.

The usual registration path includes:

1. Filing the Indiana Business Tax Application, commonly referred to as Form BT-1
2. Registering through InBiz or the Indiana Department of Revenue's online process
3. Receiving your Registered Retail Merchant Certificate, or RRMC
4. Displaying the certificate for each retail location where required

Indiana notes that a retail merchant registration carries a one-time $25 fee per location.

If your business has more than one Indiana retail address, you need to keep each location properly registered. If you fail to maintain good standing, your RRMC can be revoked and later reinstated only after the liabilities and filing issues are resolved.

How to Calculate Indiana Sales Tax

Indiana's state sales tax rate is 7%.

For most transactions, the calculation is simple:

• Determine whether the item is taxable
• Apply the 7% state rate to the taxable amount
• Collect tax at the time of sale
• Keep the invoice and transaction records for your books

If a transaction includes both taxable and exempt items, separate the amounts carefully. That distinction matters during audits and when reconciling filed returns.

If a buyer provides a valid exemption certificate, you generally should not collect sales tax on the exempt transaction. If the certificate is missing, incomplete, or invalid, you may be responsible for the tax later.

Exemption Certificates and Resale Purchases

Indiana businesses often use exemption certificates for resale purchases and other valid exempt transactions.

The state's general sales tax exemption certificate, commonly known as ST-105, is used for many exempt purchases. Buyers must provide proper documentation, and sellers should keep those certificates on file.

A valid exemption certificate should be legible, signed, and supported by the buyer's tax-exempt information where required. Never rely on a buyer's verbal statement alone.

Good recordkeeping for exemptions should include:

• A copy of the exemption certificate
• The date of the transaction
• A description of the goods sold
• The reason the transaction was treated as exempt

Indiana Use Tax: The Other Side of Sales Tax

Use tax is closely related to sales tax. If Indiana sales tax was not charged on a purchase that will be used, stored, or consumed in Indiana, use tax may apply.

Businesses often encounter use tax when they:

• Buy equipment from an out-of-state vendor
• Import items into Indiana without being charged sales tax
• Use taxable goods internally after purchasing them tax-free for another reason that no longer applies

Sales tax and use tax are designed to reach the same 7% rate. If you pay one at the point of sale, you generally do not owe the other on the same purchase.

Filing and Paying Sales Tax

Indiana requires registered businesses to file sales tax returns electronically. Depending on your volume, you may file monthly, quarterly, or annually.

Your filing frequency is generally based on your sales tax activity. Smaller filers may qualify for less frequent returns, while higher-volume merchants often file more often.

Important filing points include:

• File on time even if you had no sales during the period
• Keep proof of payment and filing confirmation
• Reconcile your sales records before submitting the return
• Do not ignore zero-return obligations if you are still registered

Indiana imposes penalties for late filings, and repeated noncompliance can lead to certificate revocation or additional collection activity.

Remote Seller Compliance in Indiana

If your business is outside Indiana but sells to Indiana customers, remote seller compliance deserves special attention.

Indiana's current remote seller framework generally requires registration when the business exceeds the $100,000 gross revenue threshold into Indiana in the current or previous calendar year.

Once registered, you are expected to collect and remit Indiana sales tax just like an in-state merchant for taxable sales sourced to Indiana.

Remote sellers should also remember:

• Marketplace sales may be handled by the marketplace facilitator, not the seller
• Taxable transactions must still be identified correctly
• Indiana may require returns even when your business has limited taxable activity

Common Audit Triggers

Indiana businesses are more likely to face problems when records are incomplete or tax treatment is inconsistent.

Common audit triggers include:

• Late filings or missed returns
• Underreported sales
• Missing exemption certificates
• Unreconciled tax collected from customers
• Incorrect treatment of taxable and exempt goods

A simple monthly review of sales tax collected, exemptions claimed, and returns filed can prevent most of these issues.

Recordkeeping Best Practices

Strong recordkeeping is one of the most effective ways to stay compliant.

Keep the following organized:

• Sales invoices
• Exemption certificates
• Purchase receipts
• Filed returns
• Payment confirmations
• Marketplace reports, if applicable

If your business operates in multiple states, separate Indiana transactions from other states' tax records so you can quickly answer questions from your accountant or the Department of Revenue.

How New Business Owners Can Stay Compliant

If you are launching a new Indiana business, build tax compliance into your setup process instead of trying to fix it later.

A practical launch checklist looks like this:

• Form the correct entity for your business
• Register with the Indiana Department of Revenue if you will sell taxable goods
• Confirm whether your products or services are taxable
• Set up your accounting system to track sales tax separately
• Collect exemption certificates before treating a sale as exempt
• Put filing deadlines on your calendar

If you are still choosing your business structure, a clean formation process can make future tax compliance easier. Zenind helps entrepreneurs form US businesses with a structured, professional foundation so they can focus on operations and growth.

Final Takeaway

Indiana sales tax is manageable once you understand the basics: the state rate is 7%, taxable sales of tangible personal property must be collected properly, remote seller thresholds matter, and exemption certificates must be documented carefully.

The businesses that stay compliant are usually the ones that register early, keep records organized, and treat sales tax as a routine part of operations rather than an afterthought.