How to File Sales Tax in Montana: MT Small Business Guide
Complete Montana sales tax guide for small businesses. Current rates, nexus rules, filing deadlines, and registration walkthrough.
If you sell goods or taxable services to customers in Montana, sales tax rules probably concern you. This guide walks through what applies, how to register, and how to file — updated for 2026.
The current Montana rate
Montana has no statewide sales tax. No state or local sales tax applies to most transactions. You may still have obligations for Meals & Rooms Tax (in Montana) or other excise taxes depending on your industry.
Who must collect?
You have nexus (obligation to collect) if one of the following is true:
- You have a physical presence (store, office, warehouse, employee, or contractor) in the state
- You store inventory at an Amazon FBA warehouse in the state
If any of these apply, you must register with the no state sales tax before your first taxable sale.
Filing frequency and deadlines
Frequency is assigned by the no state sales tax based on your expected tax liability:
- Monthly: for larger collectors (thresholds vary by state)
- Quarterly: for mid-size sellers
- Annually: for the smallest sellers
Most returns are due by the 20th of the month following the reporting period. Late filings incur penalties plus interest.
How to register and file
1. Register for a Sales and Use Tax Permit at mtrevenue.gov
2. Receive your account number (usually within 1-10 business days)
3. Collect tax at the correct rate for each sale
4. File your return — even in months with zero sales (zero returns are required)
5. Remit collected tax by the deadline via ACH, credit card, or check
6. Keep records for at least 4 years
Common mistakes small businesses make
- Using your own address's tax rate instead of the customer's (destination-based states)
- Forgetting to file a zero return in slow months
- Losing track of exempt sale certificates
- Missing the economic nexus threshold by a thin margin without realizing
- Not updating rate changes when Montana publishes new local rates quarterly
How TinSuite handles this
TinSuite's tax engine automates Montana sales tax end-to-end:
- Detects when you cross nexus threshold (economic or physical)
- Applies the correct Montana destination-based rate automatically at invoice time
- Generates a filing-ready Sales Tax Report grouped by jurisdiction, matching the format the no state sales tax expects
- Sends reminders 7 and 1 days before each filing deadline
- Tracks exempt sales and stores resale certificates
Try TinSuite free for 14 days — no credit card required.
Want more? See our complete US sales tax guide or explore our Canadian GST/HST guide.