What Is a Material Purchase Certificate in Mississippi?

A Material Purchase Certificate in Mississippi is a Department of Revenue certificate that lets a contractor on a qualifying non-residential construction project buy component materials and services without paying the standard 7% sales tax. It exists because Mississippi taxes those projects differently in the first place: under Mississippi Code Section 27-65-21, non-residential contracts over $10,000 are subject to a 3.5% contractor’s tax on the contract price, and the MPC is the mechanism that keeps suppliers from charging sales tax on top of that.¹²

The arithmetic is straightforward. On $200,000 of materials, 7% sales tax would run $14,000. With an MPC on a qualifying contract, the contractor doesn’t pay that tax at the register; the state collects instead through the 3.5% tax on the overall contract.³

Which Projects Qualify

Three conditions have to line up before an MPC is available:

The work must be non-residential. Residential construction, meaning any building used as or primarily connected to a dwelling, is excluded from the 3.5% contractor’s tax, so no MPC is issued for it. Those contractors pay the regular 7% on their materials.³
The total contract price must exceed $10,000. Smaller contracts fall outside Section 27-65-21 and remain taxed at the 7% retail rate on materials.¹
The job must involve constructing, building, erecting, repairing, grading, excavating, drilling, or adding to a structure or improvement. The statute reaches a long list of work including highways, bridges, pipelines, power plants, and water systems.¹

Renovation and repair count. A $50,000 commercial office renovation qualifies for an MPC on the same footing as new construction, as long as the contract clears the $10,000 threshold.

What the Certificate Covers, and What It Doesn’t

The MPC exempts materials and services that become a component part of the finished structure. That phrase does the work. If the item is physically incorporated into the project and stays there, it qualifies. If it’s used up during construction without becoming part of the structure, it doesn’t.²

Lumber, concrete, wiring, plumbing fixtures, roofing, and HVAC components are component parts. Tools, work equipment, building forms, repair parts for equipment, and other consumable supplies are not, and remain taxable at 7%.³ A contractor can’t use the MPC to pick up a table saw, rent a crane, or buy sandpaper tax-free.

How to Apply

Contractors apply using Form 72-405, the Contractor’s Application for Material Purchase Certificate and/or Contract Qualification, filed with the Mississippi Department of Revenue.⁴ The application must be submitted before work on the project begins.²

The form asks for the contractor’s business information, tax identification, and details about the specific contract. The DOR reviews the application to confirm the project meets the non-residential and dollar thresholds under Section 27-65-21. Unresolved tax liabilities can delay or block issuance.

Each MPC is tied to one contract and carries its own number. It does not carry over to other jobs, and it ends when the covered project is complete.² A contractor running three qualifying projects needs three certificates. This is the most commonly misunderstood part of the system: the MPC is project-specific, not a company-wide purchasing pass.

How Subcontractors Use the MPC

Subcontractors do not apply for their own certificates. They use the prime contractor’s MPC number when buying component materials and services for the covered project.³ The flow-through covers the usual trades: plumbing, electrical, HVAC, painting, excavation, landscaping, structural steel, paving, and concrete, among others.

The same limits apply. Only component materials qualify, and only for the project the MPC covers. A subcontractor working a different job can’t use the prime’s MPC number there. If the prime contractor hasn’t paid the 3.5% tax on the full contract, each subcontractor becomes individually liable for the tax on their own portion of the work.¹

Bond Requirement on Larger Contracts

Qualifying for an MPC isn’t the end of the compliance list. On non-residential contracts over $75,000 that are taxable under Section 27-65-21, the prime contractor has to furnish a surety bond covering sales, use, income, franchise, withholding, and diesel fuel taxes, or prepay the sales and use tax before starting work.³ Out-of-state contractors face the same requirement on any contract over $10,000.¹

The DOR accepts a Tax Rider (Form 72-440) filed with an existing performance or payment bond, a separate Job Bond (Form 72-441) for a single contract, or a Blanket Bond (Form 72-442) covering multiple contracts sized at a factor of at least 4% of the outstanding contract amounts. Bonds submitted with dollar caps on the face are rejected, and the original seal of the bonding company has to appear on the document.³

Records You Have to Keep

Recordkeeping is where most MPC problems begin. Contractors and subcontractors must keep detailed records and invoices for every tax-free purchase. When the records don’t substantiate the exemption, every purchase defaults back to a retail sale taxable at the full 7%.⁵

Keep a copy of the certificate, every invoice showing the MPC number, receipts for all material purchases on the project, and documentation connecting each purchase to the specific contract. Problems usually show up in audits when a contractor mixed purchases across projects under one MPC number, or didn’t separate component-material invoices from tools and supplies.

Credit for Sales Tax Already Paid

Materials sometimes get bought before the MPC comes through, with 7% paid at the register. Mississippi allows a credit in that situation. Retail sales tax paid on items that became a component part of the covered structure can be credited against the contractor’s sales tax liabilities once the MPC is issued.⁵ Tax paid on tools, equipment, or consumable supplies is not creditable, because those items wouldn’t have qualified under the MPC in the first place.

What Misuse Costs

Using an MPC on purchases that don’t qualify, applying it to projects it doesn’t cover, or failing to keep records can lead to several consequences. The DOR may revoke the certificate, which pushes the contractor back to paying 7% on all material purchases going forward. Past purchases that didn’t actually qualify become retroactively taxable at the 7% retail rate, with interest.

Mississippi classifies violations of the sales tax chapter as a misdemeanor. A conviction can carry a fine of up to $500, up to six months in the county jail, or both. During an audit, the DOR may require contracts and project details to verify that each tax-free purchase was tied to a qualifying job, and the burden of proof sits with the contractor.

1
Justia. Mississippi Code 27-65-21 – Contracting, Etc
2
Cornell Law School. 35 Miss. Code. R. 4-10-01-501
3
Mississippi Department of Revenue. Guide for Construction Contractors
4
Mississippi Department of Revenue. Contractor’s Application for Material Purchase Certificate and/or Contract Qualification
5
LII / Legal Information Institute. 35 Miss. Code. R. 4-10-01-508