Minnesota buyers and sellers both carry liability when an exemption is claimed without a valid certificate. The buyer claims tax-free treatment on Form ST3, the Certificate of Exemption, and the seller keeps that form on file for the Minnesota Department of Revenue (DOR). If the certificate is missing or defective, the DOR can bill the seller for the uncollected tax plus interest.
This guide explains what is exempt, how the current Minnesota Form ST3 works, how long certificates stay valid, and what sellers must retain. Every figure below is verified against live DOR and statute sources.
What Is a Minnesota Sales Tax Exemption Certificate?
Form ST3, the Certificate of Exemption, is the single standardized document a buyer gives a seller to buy qualifying items without sales tax. The seller keeps it on file. The DOR does not approve or issue it for most exemptions. The exemption comes from statute; the certificate is only proof of it.
Minnesota’s sales and use tax sits in Minnesota Statutes Chapter 297A. Minnesota is a full member of the Streamlined Sales and Use Tax Agreement (SSUTA) as of October 1, 2005, so Form ST3 mirrors the multistate Streamlined Certificate of Exemption. Sales tax applies at the point of purchase. Use tax applies when taxable goods are used in Minnesota without sales tax paid, at the same 6.875% state rate under Minn. Stat. § 297A.62.
Is a Minnesota Resale Certificate Different From an Exemption Certificate?
No. Minnesota uses one form, Form ST3. Resale is one exemption reason on that form, not a separate certificate. A wholesaler buying inventory to resell and an authorized nonprofit buying equipment both claim their exemption on the same ST3, checking different reason codes. There is no standalone “resale certificate” document in Minnesota.
What Is Exempt From Sales Tax in Minnesota?
Minnesota has two kinds of exemptions. Some items are nontaxable by law for every buyer, with no certificate required. Other purchases are exempt only for qualifying buyers who hand the seller a completed Form ST3. The first group needs no paperwork; the second group always does.
The table below lists items that are nontaxable by law for everyone, drawn from the DOR Nontaxable Sales guide.
| Nontaxable item | Detail | Source |
|---|---|---|
| Unprepared grocery food | Exempt for all buyers; prepared food, candy, and soft drinks stay taxable | Minnesota DOR Nontaxable Sales guide |
| Clothing | Most clothing is exempt statewide with no certificate | Minnesota DOR Nontaxable Sales guide |
| Prescription drugs | Exempt for all buyers | Minnesota DOR Nontaxable Sales guide |
| Prescribed durable medical equipment | Exempt for all buyers | Minnesota DOR Nontaxable Sales guide |
| Secure firearm storage units | Exempt effective July 1, 2023 | Minnesota DOR Nontaxable Sales guide |
What Exemption Categories Does Form ST3 Cover?
Form ST3 lists 20 lettered exemption reasons, codes A through P, plus 20 business-type codes numbered 01 to 20, per the current Rev. 6/26 form. The buyer checks one reason and supplies the matching ID or authorization. The table shows the most common categories.
| Exemption reason | Who qualifies | Required ID or attachment | Source |
|---|---|---|---|
| Resale | Retailers and wholesalers buying inventory to resell | Minnesota Tax ID or another state’s tax ID | Form ST3 (Rev. 6/26) |
| Resale of taxable services | Businesses reselling taxable services | Tax ID number | Form ST3 (Rev. 6/26) |
| Charitable, religious, or educational nonprofit | Organizations with DOR exempt-status authorization | Exempt status number from Form ST16 | Form ST3; Minn. Stat. § 297A.70 |
| Federal government | US agencies | Agency identification | Form ST3 (Rev. 6/26) |
| Tribal government | Qualifying tribal entities | Authorization | Form ST3 (Rev. 6/26) |
| Capital equipment | Manufacturers, miners, refiners | ST3 with capital equipment reason | DOR Fact Sheet 103 |
| Agricultural production | Farmers and agricultural producers | ST3 agricultural reason | Form ST3 (Rev. 6/26) |
| Industrial production / manufacturing | Producers of goods for sale | ST3 industrial production reason | Form ST3 (Rev. 6/26) |
| Direct pay | DOR-authorized businesses | Direct pay authorization number | Form ST3 (Rev. 6/26) |
| Packaging materials | Sellers packaging goods for sale | ST3 reason code | Form ST3 (Rev. 6/26) |
Government and nonprofit exemptions rest on Minn. Stat. § 297A.70; some local government purchases stay taxable, so match the specific reason code before claiming. One recent carve-out matters: electricity bought by a data center no longer qualifies for the ST3 utilities percentage exemption, effective July 1, 2025, per the Form ST3 instructions.
How Do You Fill Out Minnesota Form ST3?
Complete six parts of Form ST3 and give it to the seller, never to the DOR. The seller keeps it. The state does not receive most ST3 forms.
- Enter your purchaser name, address, and type of business.
- Enter your ID number: Minnesota Tax ID, federal employer identification number (FEIN), or Social Security number (SSN) where applicable.
- Enter the seller’s information.
- Check the exemption reason box and add any required detail.
- Indicate whether this is a single-purchase certificate or a blanket certificate covering ongoing purchases.
- Sign and date the form, then give it to the seller.
Does Minnesota Accept Electronic Exemption Certificates?
Yes. Minnesota Statutes section 297A.72 accepts a completed exemption certificate with an electronic signature equivalent under section 270C.304, so a properly formatted electronic ST3 is valid. It must carry the same required data elements as paper: purchaser name and address, an ID number, a business-type code, an exemption-reason code, and a signature or its electronic equivalent.
Do Minnesota Sales Tax Exemption Certificates Expire?
No fixed expiration applies. A blanket Form ST3 stays valid as long as the purchaser keeps buying from that seller and the information remains accurate, until the purchaser cancels it, per the Form ST3 instructions. The DOR recommends refreshing certificates every three to four years even when nothing has changed, per the DOR Nontaxable Sales guide. A blanket certificate must also be updated “as needed” to stay accurate under Minn. Stat. § 297A.72, subd. 2.
How Does the Minnesota Nonprofit Sales Tax Exemption Work?
Federal 501(c)(3) status alone does not exempt purchases in Minnesota. The organization first applies on Form ST16, Application for Nonprofit Exempt Status. The DOR allows itself 60 days after receipt to make a determination, then issues an exempt-status number. Only then can the nonprofit claim the exemption on Form ST3.
Even after authorization, the exemption does not cover lodging or prepared food, per the Form ST3 instructions. The exemption applies to the organization’s purchases, not to its sales.
What Is the Minnesota Manufacturing Exemption?
Minnesota offers two manufacturing-related exemptions. The capital equipment exemption covers machinery used to produce goods for retail sale. The industrial production exemption covers materials consumed while producing those goods. Both are claimed on Form ST3.
How does the capital equipment exemption work?
The capital equipment exemption is an up-front, point-of-sale exemption on machinery and equipment used in Minnesota to manufacture, fabricate, mine, or refine tangible personal property for retail sale. Minnesota switched from a refund process on Form ST11 to this up-front exemption effective July 1, 2015. Buyers claim it by giving the vendor a completed Form ST3 with the capital equipment reason, per DOR Fact Sheet 103.
What counts as industrial production materials?
Materials consumed or used in producing a product for sale qualify under the industrial production reason on Form ST3. This covers inputs used up during production, which is a different category from the durable machinery covered by the capital equipment exemption.
What Qualifies for the Minnesota Agricultural Exemption?
Farm machinery and materials used in agricultural production qualify when the buyer claims the agricultural production reason on Form ST3, per DOR guidance. Qualifying purchases typically include feed, seed, fertilizer, chemicals, and machinery used directly in farming. General-purpose vehicles and tools can still be taxable, so classification matters.
What Is Direct Pay Authorization in Minnesota?
Direct pay authorization lets a DOR-approved business buy taxable goods without paying tax to the seller. The business instead remits use tax directly to the state based on actual taxable use. It applies to the DOR for the authorization and then claims it on Form ST3 using the direct pay reason. This suits large buyers whose taxability depends on end use.
What Are a Seller’s Responsibilities When Accepting an ST3?
Accept the certificate in good faith, confirm it is complete, and retain it. An incomplete or missing certificate makes the seller liable for the uncollected tax. A fully completed certificate taken at the time of sale conclusively relieves the seller of the duty to collect the tax, for sales after December 31, 2001.
| Rule | Requirement | Source |
|---|---|---|
| Required fields | Purchaser name and address, an ID number (MN Tax ID, another state’s tax ID, FEIN, or driver’s license/state ID), business-type code, exemption-reason code, and signature | Minn. Stat. § 297A.72, subd. 2 |
| Timing at sale | Certificate taken at time of sale conclusively relieves the seller | Minn. Stat. § 297A.72 |
| Timing after sale | Relief if the certificate is obtained at sale or within 90 days after the sale | Minn. Stat. § 297A.665 |
| Audit cure window | 120 days after a Commissioner’s substantiation request to obtain a good-faith certificate | Minn. Stat. § 297A.665 |
| Misuse penalty | $100 fine per transaction for using a certificate to evade tax | Form ST3 (Rev. 6/26) |
| Blanket updates | Update a blanket certificate as needed to stay accurate | Minn. Stat. § 297A.72, subd. 2 |
The verified timing rule is 90 days after the sale, with a 120-day cure period after a Commissioner request. There is no separate “60-day” seller rule.
Can Minnesota Sellers Accept Out-of-State Exemption Certificates?
Yes, for resale. The ID hierarchy on Form ST3 accepts another state’s tax ID under Minn. Stat. § 297A.72, subd. 2, so an out-of-state buyer without a Minnesota Tax ID can claim resale using its home-state registration number. Because Minnesota is a full SSUTA member since October 1, 2005, sellers may also accept the multistate Streamlined Certificate of Exemption.
In a drop shipment, a Minnesota seller shipping to a customer on behalf of an out-of-state reseller may accept that reseller’s completed Form ST3 with a valid out-of-state ID as proof of the resale exemption.
How Should Businesses Manage Exemption Certificates?
Collect a completed Form ST3 before or at the time of each exempt sale. Validate the required fields, store certificates so you can retrieve them fast, and review records on a schedule. Request updated certificates whenever a buyer’s information changes, since a stale certificate can fail an audit even when the buyer was legitimately exempt.
How Commenda Automates Exemption Certificate Management in Minnesota
Commenda’s indirect tax software collects, validates, and stores exemption certificates and keeps your sales tax compliance audit-ready across every state where you sell. It attaches each Form ST3 to the right customer record, checks the required fields, and flags stale certificates when a buyer’s information changes. It connects to your billing and accounting stack through 100+ ERP and API integrations, so your ST3s stay retrievable for a DOR review. ERP stands for enterprise resource planning.
For Minnesota rates, thresholds, and filing detail, use the Minnesota sales tax guide as your canonical reference. Book a demo to get a free exemption certificate compliance review and see exactly which certificates on file would survive an audit.
