Don’t Get Caught Off Guard: Keep Your Sales Tax Exemption Certificates Up to Date

  • By Grace Kwon
    • Jun 25, 2026
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Sales Tax Exemption

Businesses operating in the United States should understand the sales and use tax compliance obligations imposed by the 45 states and the District of Columbia that levy a sales tax. Each jurisdiction maintains its own rules governing nexus, registration requirements, the taxability of products and services, and applicable tax forms. Once a business establishes nexus in a state, it is generally required to collect and remit sales tax on taxable transactions, including retail sales of tangible personal property and taxable services, unless it has accepted a valid exemption certificate in good faith from the purchaser. 

An exemption certificate is a document provided by a qualifying exempt entity or individual to a seller to substantiate that a purchase is exempt from sales tax. Proper collection and retention of exemption certificates are critical to supporting exempt sales and mitigating potential audit exposure. 

States may provide full or partial exemptions based on the nature or status of the customer making the purchase (e.g., government agency, nonprofit) and requires documentation to exempt sales to the purchaser: 

  • Federal Government: The federal government is generally exempt from state sales and use taxes, and states may not impose tax on direct sales made to the federal government. However, sales to certain federal instrumentalities that are not owned by the United States, such as Federal Reserve Banks and federal credit unions, may still be subject to sales tax. In addition, contractors performing work for the federal government should verify whether the government’s tax-exempt status extends to them in their capacity as agents, as such exemptions do not automatically apply in all circumstances. 
  • Nonprofit Organizations: Sales to nonprofit organizations are generally subject to sales tax unless the purchases are made for charitable purposes or another applicable exemption applies. Vendors should not assume that all nonprofit purchases are automatically exempt from sales tax; instead, they should obtain valid exemption certificates to properly document any exempt transactions. 
  • Multi-Entity Purchasers: Large organizations with multiple legal entities may make purchases through one entity while providing an exemption certificate issued to another. Because sales tax is a transaction-based tax that applies on an entity-by-entity basis, state tax authorities may consider an exemption certificate invalid if it is not issued by the entity that is the party to the transaction. Additionally, following corporate reorganizations, mergers, or name changes, vendors should obtain updated exemption certificates to ensure that the documentation accurately reflects the correct legal entity and supports the claimed exemption. 

Who Bears the Burden of Recordkeeping? 

In general, state exemption laws place the burden on sellers to exercise due care in accepting only properly completed exemption certificates and to maintain adequate records supporting exempt sales.

Because tax exemption statutes are typically construed narrowly in favor of the taxing authority and against the party claiming the exemption, sellers that fail to collect sales tax may remain liable if they accept an invalid certificate or cannot produce a valid certificate during an audit.

As a result, deficiencies in exemption certificate documentation can lead to significant audit assessments, including tax, penalties, and interest. 

Accordingly, businesses should understand the applicable exemption forms, certificate timing and renewal requirements, best practices for exemption certificate management, and the potential consequences of noncompliance. 

When doe you need to issue the exemption certificate? 

Most states require exemption certificates to be obtained at the time of sale or within a specified period thereafter, such as 30 or 90 days, depending on the jurisdiction.

Although many states permit taxpayers to obtain exemption certificates retroactively during an audit, the taxpayer continues to bear the burden of proving that the sales qualify for exemption.

If certificates are not secured within the applicable time frame or cannot be produced upon request during an audit, taxing authorities may deem them invalid and treat otherwise exempt transactions as taxable.

Audit assessments frequently arise when customers who may qualify for an exemption become unresponsive, decline to provide the required documentation, or have ceased operations, leaving the seller unable to substantiate the exempt nature of the sales. 

Does My Exemption Certificate Expire? 

In most states, including California, New York, and Pennsylvania, exemption certificates remain valid indefinitely and do not require renewal.

However, a limited number of states impose renewal requirements to maintain the validity of exemption certificates.

For example, exemption certificates in Alabama and Arizona must renew annually, while Massachusetts requires renewal every ten years.

Businesses should be familiar with the renewal requirements applicable to their exemption certificates and implement procedures to monitor and track certificate expiration dates to ensure continued compliance. 

What are Potential Risks of Noncompliance? 

Knowingly providing a false or invalid resale certificate for property that is not being purchased for resale in the ordinary course of business may constitute a misdemeanor offense.

In addition to being liable for the sales tax that would have been due absent the improper certificate, the purchaser may also be subject to interest, negligence penalties, fraud penalties, or other applicable sanctions.

For example, in Washington, a buyer who improperly uses a reseller permit number, reseller permit, or other documentation to acquire goods or services at retail without paying sales tax is subject to a mandatory penalty equal to 50% of the tax due, in addition to all other applicable taxes, penalties, and interest assessed by the Washington Department of Revenue. 

Best Practices  

Managing exemption certificates can be complex, particularly as states continue to increase scrutiny of both the form and use of exemption documentation.

To minimize compliance risks, sellers should establish procedures to collect, validate, and retain exemption certificates as part of the customer onboarding process or contemporaneously with the transaction.

Taking these steps can help avoid the need to collect tax unnecessarily and reduce exposure during a sales tax audit. 

Exemption certificates should be thoroughly reviewed for completeness, accuracy, and timeliness before being accepted. Sellers are generally required to make a good-faith effort to verify that a certificate is valid and properly supports the claimed exemption.

Where a purchaser must be registered with a state in order to issue a valid exemption certificate, the seller should also confirm the purchaser’s registration status as part of its validation process. 

From the buyer’s perspective, businesses should establish procedures to ensure that exemption certificates are issued properly and renewed when required.

Buyers should verify that the correct exemption certificate is provided for each transaction and regularly monitor their business activities to determine whether additional state tax registrations are necessary.

When new registrations are obtained or business circumstances change, updated exemption certificates should be issued to ensure continued compliance and support for exempt purchases. 

How Leyton Provides Exemption Certificate Management (“ECM”) 

By maintaining accurate exemption certificate records and adhering to applicable compliance requirements, businesses can:

  • better support exempt sales
  • minimize potential tax liabilities
  • and improve cash flow management.

Leyton offers Exemption Certificate Management (ECM) services to help businesses strengthen their sales tax compliance processes. Leyton’s SALT specialists can:

  • evaluate existing procedures
  • review exemption certificate documentation
  • and identify opportunities to enhance compliance and reduce audit risk
  • and improve cash flow management.

Author

grace kwon
Grace Kwon

Tax Attorney

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