Indiana Sales Tax Filing Guide — 2026

Most states assign a filing cadence when you register, based on your expected tax liability: monthly for high-volume sellers ($50K+ tax liability/year), quarterly for mid-volume, and annually for low-volume. Indiana may reassign your frequency if your liability changes materially.

Even if you had zero taxable sales in Indiana during a period, you must file a zero return. Missing filings trigger penalties regardless of tax owed. Most automated tax services will file zero returns for you by default.

Indiana's filing due dates are typically the 20th of the month following the period end (with variations). Late filing penalties are usually 5%/month up to 25%; late payment adds interest. Register for the state's auto-pay or use a service that remits on your behalf to avoid late fees.

• Skipping a zero return in a slow month — most penalty exposure comes from missed filings, not unpaid tax.
• Waiting until due date to file; Indiana's portal can time out on volume days. File at least 48 hours early.
• Not keeping exemption certificates on file — if you're audited and can't produce a valid certificate for a tax-exempt sale, that sale becomes taxable and you owe the uncollected tax.

Indiana sales tax nexus and economic nexus threshold: more than $100,000 in gross revenue from sales into Indiana in the current or preceding calendar year. Effective January 1, 2024, Indiana removed its prior 200-transaction test; the state now uses a sales-only threshold. Indiana DOR Sales Tax Information Bulletin #89 says the threshold includes tangible personal property delivered into Indiana, products transferred electronically into Indiana, and services delivered in Indiana, including exempt sales and wholesale transactions. Services are sourced to Indiana when the buyer first uses them in Indiana, but a seller that provides only nontaxable services generally is not required to register solely because it crosses the threshold. Marketplace facilitators count both their own Indiana sales and facilitated marketplace sales toward the $100,000 threshold; marketplace sellers generally exclude sales made through registered marketplaces from their own Indiana threshold test unless the marketplace facilitator has not met the threshold. Indiana's statewide sales tax rate is 7%, with no local sales-tax add-on, and remote sellers with less than $1,000 in annual Indiana sales-tax collections generally file annually. Indiana DOR source data last retrieved 2026-06-01.

Read the full Indiana overview for thresholds, filing frequency, marketplace facilitator rules, and registration links. Use the nexus calculator to check whether you have crossed the threshold. For background on the post-Wayfair economic nexus framework, see the pillar guide.

• Indiana · Thresholds
  Economic and transaction nexus thresholds
• Indiana · E-commerce
  General e-commerce sales tax rules
• Indiana · Marketplace Facilitator
  Marketplace facilitator law for the state