Missouri Sales Tax Exemption Certificate: Form 149 Requirements and Use

A Missouri sales tax exemption certificate, filed on Form 149, lets a qualifying buyer purchase tangible personal property without paying the state’s 4.225 percent sales tax or any local tax on top of it.¹ You complete the form, give it to the seller at or before the sale, and the seller drops the tax off the invoice. The certificate is what protects the seller in an audit, and it is also what puts you on the hook if the exemption turns out not to apply.²

Who Qualifies to Use Form 149

Missouri Revised Statutes Section 144.030 sets out which purchases are exempt from state and local sales and use tax. The categories that cover most buyers are resale, manufacturing, agricultural, and nonprofit or government use.

Resellers

If you buy inventory to resell it, the purchase is exempt because Missouri does not tax the same item twice on its way to the final consumer. A Missouri retailer claiming resale must have a Missouri Tax ID number, which the Department of Revenue can verify against its records.³ The exemption only covers items you actually resell. Pull something off the shelf for your own use and you owe use tax on it.

Manufacturers

Manufacturers qualify when buying materials, machinery, and parts that become an ingredient or component of a new product intended for retail sale, along with items consumed during the manufacturing process itself.⁴ Equipment used directly in production qualifies. Office supplies and break-room furniture do not.

Agricultural Purchasers

Farms get broad exemptions on machinery and equipment used exclusively for agriculture, breeding and feeding livestock and poultry, feed and vaccines, seed, fertilizer, herbicides, pesticides, limestone, fencing, motor fuel for qualifying equipment, and certain off-highway utility vehicles.⁴ Every one of these exemptions turns on the farm products being intended for ultimate sale. A hobby garden does not qualify.

Nonprofits and Government

Nonprofits cannot go straight to Form 149. First they must obtain an Exemption Letter from the Department of Revenue by filing Form 1746, with the IRS 501(c) determination letter, a Missouri Secretary of State certificate of incorporation, the organization’s bylaws, and three years of financial statements attached. Missing documents delay or kill the application. Unions, political organizations, and homeowners’ associations are specifically excluded from the exemption.⁵ Federal agencies, Missouri state agencies, political subdivisions, and public schools are exempt by default and do not file Form 1746.⁶ Once the Exemption Letter issues, the nonprofit renews it periodically with Form 1746R.

Completing Form 149

Download Form 149 from the Department of Revenue’s website; the current version was revised in late 2025.³ The form requires information from both sides of the transaction.

Enter the purchaser’s name, address, and Missouri Tax ID number, or an SSN or FEIN if you do not have a state ID. Then enter the seller’s name and address. Missouri retailers claiming resale must have a Missouri Tax ID, but some categories do not require one. A wholesale exclusion, for example, does not.³

Next, check the exemption category. The form lists Resale, Manufacturing, Agricultural, Electricity Production, Common Carrier, Locomotive Fuel, Air and Water Pollution Control, Commercial Motor Vehicles or Trailers over 54,000 pounds, Nuclear Security Enterprise, Broadband Communications Services, and Other.³ Each category has its own conditions printed on the form. Read them before checking the box.

Single Purchase or Blanket

You choose between a single-purchase certificate covering one transaction and a blanket certificate covering all qualifying purchases from that vendor going forward. A blanket certificate saves both parties from generating paperwork on every order when you buy exempt items from the same supplier repeatedly. Form 149 does not set an expiration date for blanket certificates, but you should reissue whenever your Tax ID, legal name, or exemption basis changes.

Signature

The form is not valid without a signature and date. The signer declares under penalties of perjury that the information is true, complete, and correct.³ That language is not decoration. It ties the signer personally to any misrepresentation.

What Happens at the Sale

Deliver the completed form to the seller at or before the point of sale. The seller then excludes tax on the qualifying items and keeps the certificate as documentation.

Under Section 144.210, the burden of proving a sale was not taxable falls on the seller.² A properly completed certificate is the seller’s primary evidence. The seller must accept it in good faith, which means without any obvious reason to doubt the buyer’s claim or the exempt use of the items. A certificate accepted for a clearly non-qualifying purchase does not carry good-faith protection.

When a buyer’s claim later turns out to be improper, the director of revenue can collect the unpaid tax, interest, and penalties directly from the buyer, and anything collected from the buyer is credited against what the seller would otherwise owe.² In practice, a seller who took the certificate in good faith and kept it filed is usually clear. The buyer is not.

Keeping the Certificate Current

Missouri law requires sellers to obtain and keep signed exemption certificates as evidence for any exempt sales they claim.² Section 144.210 does not set a specific retention period, but the general statute of limitations for Missouri sales tax assessments is three years, so the Department can audit transactions going back at least that far. Fraud or substantial underreporting extends the lookback well beyond three years.

Keep certificates on file for at least three years, longer if the situation is complex. Buyers should keep their own copies too, even though the retention duty falls on sellers, because a buyer defending against a direct assessment needs its own records.

A certificate can also go stale without a formal expiration date. If a nonprofit’s Exemption Letter is revoked or expires, every Form 149 tied to that letter loses its validity. A change in the buyer’s Tax ID, legal name, or exemption basis all require a fresh Form 149. A seller who spots outdated information should ask for a replacement before running the next exempt sale.

Penalties for Misuse

Under Section 144.157, anyone who willfully fails to collect, willfully attempts to evade, or willfully overcollects sales tax faces a penalty equal to the total tax evaded, on top of the unpaid tax, interest, and any other additions.⁷ The penalty alone can double the original tax bill.

Corporate officers and directors are personally exposed. If a corporation fails to pay assessed sales tax and the assessment becomes final, anyone with direct control over or responsibility for filing returns and making payments can be personally assessed for the unpaid amounts plus interest and penalties, including at administratively dissolved corporations and foreign corporations whose authority has been revoked.⁷ The corporate shield does not block this.

Most trouble is not outright fraud. It is buying tax-free for resale and then using the item, or leaving a certificate on file after the underlying status changed. Both create liability. Treat every certificate as a live legal document that reflects your current business, and remit use tax on anything you divert from its stated exempt purpose.

Contractors Working for Exempt Entities

Form 149 is not the right document when a contractor buys construction materials for a tax-exempt entity’s project. Section 144.062 uses a separate project exemption certificate approved by the director of revenue. The exempt entity issues the certificate to the contractor, showing the entity’s name, address, and Missouri tax ID number, a project description and location, a unique project ID number, the contract date (the earliest date materials can be bought tax-free), an estimated completion date, and an expiration date.⁸ The contractor gives it to suppliers, whose invoices must show the entity’s name and the project ID, and passes copies to any subcontractors. The certificate only covers materials incorporated into or consumed in that specific project. It cannot be used to stock supplies for other jobs.

1
Missouri Department of Revenue. Sales and Use Tax
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Missouri Revisor of Statutes. Missouri Code 144.210 – Burden of Proving Questionable Sale on Seller, Exemption Certificates, Additional Assessment, Notice
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Missouri Department of Revenue. Sales and Use Tax Exemption Certificate
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Missouri Revisor of Statutes. Missouri Code 144.030 – Exemptions From State and Local Sales and Use Taxes
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Missouri Department of Revenue. Missouri Sales or Use Tax Exemption Application
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Missouri Department of Revenue. Maintain Non Profit Organizations
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Missouri Revisor of Statutes. Missouri Code 144.157 – Violations in Connection With Sales and Use Tax
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Missouri Revisor of Statutes. Missouri Code 144.062 – Construction Materials, Purchase by Exempt Entity, Procedure