When to Register for Montana Sales Tax Permit | EcomNexusHub
You must register for a Montana sales tax permit as soon as you meet physical or economic nexus criteria ($100,000 limit). Operating without a permit after crossing the threshold can result in back-tax liabilities and penalties.
Montana Rule Snapshot
2026 Statutory Rules for Montana
Detailed breakdown of economic thresholds, physical presence triggers, and platform settings for remote sellers shipping into Montana.
Economic Nexus Standard
Montana mandates remote sellers register once trailing gross sales cross N/A during the current or preceding calendar year.
Physical & 3PL Presence
Physical nexus is established in Montana if your business maintains a physical office, retail storefront, inventory stored in 3PL fulfillment centers (e.g., Amazon FBA in Montana), remote employees, or sales representatives.
Marketplace Pre-Collection
Montana does not currently operate under general marketplace facilitator statutes.
Registration Timelines & Grace Periods for Montana
Once your store crosses the $0 limit in Montana, statutes require remote sellers to register with Montana Department of Revenue before or on the first day of the second calendar month following the threshold month.
Visit Official Montana Registration Portal →2026 Compliance Checklist for Online Sellers
Frequently Asked Questions: Montana Sales Tax
Common questions answered for e-commerce store owners shipping into Montana.
Explore Other Montana Tax Topic Guides
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