What Is an Exemption Certificate?

An exemption certificate is a legal document that allows businesses, organizations, or individuals to purchase normally taxable goods or services without paying sales tax, based on their qualifying exempt status or the intended use of the goods or services.

Generally, a business must pay sales tax on all purchases and sales. And if they don’t pay sales tax, they must present the appropriate documentation to the taxing authority to prove that either the business or the purchase is tax-exempt. That’s where exemption certificates come in. 

When selling, businesses must collect and validate exemption certificates from their customers. A company must ensure that the certificates are valid, not expired, and complete. Otherwise, the business may be liable for the uncollected tax. 

This article will discuss the ins and outs of what a sales tax exemption certificate is and how it could impact your business.

Understanding Sales Tax Exemption Certificates

Some of the first tax-exempt organizations in the United States included hospitals, charitable organizations, schools, and churches. Currently, under Section 501 of the Internal Tax Code, organizations organized and operated for "religious, charitable, scientific, testing for public safety, literary or educational purposes, or for the prevention of cruelty to children and animals” are exempt from paying federal taxes. There are certain stipulations associated with this status, and the IRS website provides more information on the process of obtaining 501(c)(3) status.

Today, there are exemption forms for sales tax, resale, excise tax, manufacturing sales and use tax, property tax, agricultural sales and use tax, and more.

Sales Tax Exemption Certificate vs. Resale Certificate

A resale certificate is used to purchase items for resale without paying sales tax. Sales tax is charged when the item is resold, and it's typically used by retailers and wholesalers.

An exemption certificate is used to purchase items for resale without paying tax. No sales tax is charged, and nonprofits, manufacturers, and governments typically use it. 

How Sales Tax Exemption Certificates Work

If you think your business or purchase should be tax-exempt, these are the steps you can take to obtain, present, and validate exemption certificates:

1. Determine Eligibility and Gather Documentation

First, determine whether your business meets the exemption requirements. If you’re unsure, the IRS.gov website provides additional guidelines. Once you’ve determined that your business meets the requirements, you must gather the documentation to back up your claim. This might include business registration documents, sales tax ID number, and an IRS determination letter. 

2. Fill Out and Submit the Application 

You can generally find application forms and instructions on how to submit them on your state’s Department of Revenue website. 

3. Get Approval and Start Using Your Exemption Certificate

Once your application is approved, you’ll receive your exemption certificate. Present the certificate to sellers when making purchases (they should keep a copy on file, so you can likely skip this step in the future).

4. Maintain Your Exemption Certificate

Each state has different laws regarding the maintenance of exemption certificate validity. Check your state’s exemption certificate expiration periods and update your information as your business changes. 

Types of Exemption Certificates

Several things determine a business’s exemption eligibility: 

Entity-Based

• Nonprofit organizations: Must have IRS 501(c)(3) status and state approval
• Religious and educational organizations: Often exempt based on public benefit
• Government entities: Federal, state, and local entities

Industry-Based

• Manufacturers: Exemptions on equipment used in production
• Farmers: May claim exemptions for tools, feed, etc. 
• Healthcare providers: Hospitals, clinics, etc. 
• Resellers and retailers: sales tax is paid by the customer

Use-Based

• Direct use in manufacturing: tools and materials used in production
• Ingredients: items used in creating food or other products
• Equipment and machinery: tools and machinery used in production
• Professional services: some services are exempt in some states

Who Qualifies for Exemption Certificates?

Understanding who qualifies for exemption certificates is crucial for businesses and organizations seeking to reduce their tax burden legally. Exemptions are not automatic—they must be applied for, approved, and properly maintained.

The three primary categories of entities that commonly qualify for sales tax exemptions include nonprofit organizations, government entities, and certain manufacturing or industrial users. Each category has distinct requirements, permitted uses, and compliance obligations that must be carefully followed to maintain exemption status.

Nonprofit Organizations

Nonprofit organizations must meet both organizational and operational requirements and comply with IRS and state guidelines to qualify. Only qualified purchases—like fundraising supplies or office equipment—are eligible for exemption. Improper use, such as excessive compensation or political activity, can jeopardize one's status.

There are also state registration requirements. The exact requirements differ by state, but in Washington State, for example, a business must register with the Secretary of State's office, provide appropriate documents, and pay a filing fee to the state. In some cases, a company will be required to renew its filing annually.

Most, but not every, purchase that a non-profit makes qualifies as tax-exempt. Permitted purchases include items such as office supplies, fundraising expenses, and salaries. Non-permitted purchases include excessive wages or compensation, as well as certain property purchases or sales. Making non-permitted purchases can jeopardize a nonprofit’s 501(c)(3) tax-exempt status. Common disqualifying factors also include failing to file annual returns, financial mismanagement, inadequate records, or participating in a political campaign. 

Government Entities

Government entities, both at the federal and state levels, are generally tax-exempt. But the specifics can vary.

The federal government, including its departments and federal entities, is generally exempt from federal income tax, as well as state sales tax.

While state and local governments are generally exempt from paying federal income tax, they don’t all exempt themselves from state tax. Florida, Illinois, Indiana, Maryland, and Texas provide exemptions for the state government, but Arizona, California, Hawaii, South Carolina, and Washington do not.

Government contractors and vendors may qualify for some exemptions, depending on the work they do, the goods or services provided, and the level of government they work with. For example, you can generally count on the federal government to be tax-exempt when making purchases, but exemptions for state governments vary by state.

Transactions between government entities are generally exempt from tax. This is thanks to the doctrine of intergovernmental tax immunity, established by the 1819 Supreme Court Case McCulloch v. Maryland. 

Manufacturing and Industrial Users

Determining the taxability of purchases and sales in manufacturing can get tricky. To be considered tax-exempt, purchases must be used directly in the manufacturing or research and development process. For example, the purchase of a wrench can be exempt if used to repair machinery or equipment, but as soon as the foreman takes the tool home to fix a leaky faucet, tax is owed. Some other factors that qualify purchases for an exemption: 

• Purchases of machinery and equipment
• Purchases of equipment for repairing machinery and equipment
• Charges for hiring someone to repair machinery and equipment
• Renting equipment to repair or install machinery and equipment

The raw material that a business buys for the manufacturing process is generally tax-exempt, but business supplies are generally taxable. The exact specifications can vary by state, however.

Many states offer sales tax exemptions for businesses that use utilities and energy for manufacturing and agriculture. In fact, some states use tax exemptions as incentives for businesses to establish facilities within their borders.

How Can I Get Information for My State?

Sales tax exemption certificate requirements vary significantly by state. Each state's Department of Revenue sets its own rules for exemption certificates, renewal periods, application processes, and compliance requirements. Five states—Alaska, Delaware, Montana, New Hampshire, and Oregon—have no statewide sales tax, making exemption certificates inapplicable or limited to local jurisdictions only.

Expiration periods range from annual renewals to certificates that remain valid indefinitely. Understanding your state's specific requirements is crucial for maintaining compliance and avoiding unexpected tax liabilities.

Exemption Certificates by State

Here’s a look at exemption certificates and their expiration period by state.

State	Expiration Period	Source
Alabama	Renew annually	Alabama Department of Revenue
Alaska	Note: Alaska doesn’t have a statewide sales tax, but some jurisdictions have a local sales tax. Each municipality that levies a sales tax has its own rules and regulations regarding the expiration of sales tax exemptions.	Alaska Remote Seller Sales Tax Commission
Arizona	Valid for the time set on the certificate by the seller, not to exceed 48 months if the vendor has documentation the TPT license is valid for each calendar year covered in the certificate.	Arizona Department of Revenue TPT Exemptions
Arkansas	No stated expiration period	Arkansas Sales and Use Tax FAQs
California	Valid until revoked in writing by the issuer, unless issued for a specific transaction.	California Department of Tax and Fee Administration
Colorado	Valid until canceled by the Department in writing or revoked by the city or state.	Colorado Tax Exemption Qualifications
Connecticut	3 years	Connecticut Department of Revenue
D.C.	Expiration stated on the certificate	D.C. Office of Tax and Revenue
Delaware	Delaware doesn’t have a state sales tax, so exemption certificates aren’t applicable.
Florida	5 years	Florida Department of Revenue
Georgia	Valid until revoked in writing, except the Georgia Agriculture Tax Exemption certificate, which expires every three years.	Georgia Department of Revenue
Hawaii	Does not expire	Hawaii Department of Taxation
Idaho	No stated expiration period	Idaho State Tax Commission
Illinois	Varies depending on purchaser	Illinois Department of Revenue
Indiana	No fixed expiration date	Indiana Department of Revenue
Iowa	Up to 3 years	Iowa Department of Revenue
Kansas	A blanket certificate remains valid as long as the purchaser continues to make recurring purchases with no more than 12 months between sales. Tax-exempt entity certificates have an expiration date.	Kansas Exemption Certificates Guide
Kentucky	Most certificates do not have an end date unless specified. Agriculture Exemptions are set to expire on December 31, 2026, and renewals from that date will expire after four years.	Kentucky Department of Revenue
Louisiana	Valid for a period of 3 years with automatic renewal in most cases.	Louisiana Department of Revenue
Maine	No stated exemption period	Maine Revenue Services
Maryland	5 years	Comptroller of Maryland
Massachusetts	General exemption certificates are valid for a period of 10 years.	Massachusetts Department of Revenue
Michigan	A Blanket Certificate of Exemption is valid for four years from the date it’s issued.	Michigan Department of Treasury
Minnesota	Does not expire unless information changes; should update every 3-4 years.	Minnesota Department of Revenue
Mississippi	The state does not issue sales tax exemption certificates.	Mississippi Department of Revenue
Missouri	No fixed statewide term; sellers commonly refresh records every 5 years; project exemption certificates include an expiration date.	Missouri Department of Revenue
Montana	Montana doesn’t have a state sales tax, so exemption certificates aren’t applicable.
Nebraska	Valid indefinitely. Certain specialized certificates, such as common or contract carriers, are valid for three years.	Nebraska Department of Revenue
Nevada	5 years	Nevada Department of Taxation
New Hampshire	New Hampshire doesn’t have a state sales tax, so exemption certificates aren’t applicable.
New Jersey	No stated expiration period	New Jersey Division of Taxation
New Mexico	No stated expiration period	New Mexico Taxation & Revenue
New York	No stated expiration period	New York State Department of Taxation and Finance
North Carolina	Blanket certificate remains valid while the purchaser is making recurring purchases.	North Carolina Department of Revenue
North Dakota	No stated expiration period	North Dakota Tax
Ohio	No stated expiration period	Ohio Department of Taxation
Oklahoma	Certain exemptions have specific expiration dates or conditions for renewal.	Oklahoma Tax Commission
Oregon	Oregon doesn’t have a state sales tax, so exemption certificates aren’t applicable.
Pennsylvania	No stated expiration period	Pennsylvania Department of Revenue
Rhode Island	Certificates for exempt organizations are valid for four years.	Rhode Island Division of Taxation
South Carolina	No stated expiration period	South Carolina Department of Revenue
South Dakota	Does not expire unless the information on the certificate changes.	South Dakota Department of Revenue
Tennessee	Nonprofit and agricultural certificates of exemption are valid for 4 years. Other exemption certificates are valid indefinitely unless information changes.	Tennessee Department of Revenue
Texas	No stated expiration period	Texas Comptroller
Utah	No stated expiration period	Utah State Tax Commission
Vermont	No fixed expiration date	Vermont Department of Taxes
Virginia	Valid until notice from the Department of Taxation that the certificate is no longer acceptable.	Virginia Department of Taxation
Washington	Blanket certificate remains valid while the purchaser is making recurring purchases.	Washington Department of Revenue
West Virginia	Blanket certificate remains valid while the purchaser is making recurring purchases.	West Virginia Tax Division
Wisconsin	Valid indefinitely, but should be reviewed periodically.	Wisconsin Department of Revenue
Wyoming	No stated expiration period	Wyoming Department of Revenue

Challenges and Misconceptions of Exemption Certificates

Some common mistakes that businesses make when dealing with exemption certificates include:

1. Using the wrong certificate: Not all exemptions are the same. Be sure you're using the correct certificate type for your purchase or sale.
2. Collecting after the sale: Always collect certificates at the point of sale to avoid tax liability.
3. Relying on expired or incomplete certificates: Inaccurate or outdated documentation can lead to penalties and back taxes.

Managing Compliance and Documentation

Managing exemption certificates can quickly become overwhelming, especially when done manually. Keeping customer files on a desktop or in a filing cabinet leaves room for human error. It’s best practice to collect an exemption certificate from customers at the point of sale, validate certificates immediately, and ensure you’re getting up-to-date certificates as old ones expire. 

Certificate Validation and Storage

An invalid exemption certificate is as good as no certificate at all. When validating a certificate from a customer, it’s important to ensure that all the required information is included, all the information included is correct, and that you have the appropriate certificate type.

Whether you’re keeping paper copies in filing cabinets or PDFs in an organized folder, be sure that the information remains secure and easily accessible in the event of an audit. An auditor will request all the exemption certificates for the audit period to ensure that all the sales claimed as exempt have supporting documentation. An audit can feel intimidating, but you don’t have to face it alone. Hiring expert representation can give you peace of mind.

Several automated systems can assist in collecting, validating, storing, and retrieving exemption certificates; however, the most effective combination of tax compliance assistance is often a blend of tech solutions and human expertise.

Expiration and Renewal Management

Each state has its own rules for when exemption certificates expire. Some are valid indefinitely, while others require renewal annually, and some remain valid unless revoked in writing. Businesses holding exemption certificates must be proactive in contacting the taxing authority ahead of renewal. Companies collecting exemption certificates from customers must request the documents from their customers well in advance of the expiration date. There are systems that can automate this process for you, making it easier to manage the collection and validation of exemption certificates.

Expiration dates aren’t the only thing that can render an exemption certificate invalid: it’s important to register business changes and address changes with the taxing authority. An expired or invalid certificate can result in costly fines and the need to remit uncollected tax. 

Exemption Certificates: Conclusion

Sales tax exemption certificate management can get complicated quickly. And if you’re managing multiple exemption types across states, manual processes leave you vulnerable to risk. There’s a better way: automation combined with expert guidance from real humans can help you stay compliant, reduce audit risk, and save time.

Ready to eliminate sales tax compliance stress? Zamp’s managed solution is backed by a team of experts who handle nexus monitoring, registration, filing, and remittance across all states. Plus we’re on hand to help you through any exemption certificate snafus.