A sales tax exemption is a rule written into state law that lets a buyer skip paying sales tax on a purchase because of who they are, what they’re buying, or how they’ll use it. You don’t get the exemption automatically at the register. In almost every case, you have to hand the seller a signed certificate before or at the time of purchase, and the seller then leaves the tax off the bill. Forty-five states and the District of Columbia charge a statewide sales tax, and every one of them writes exemptions into the code. The five states with no statewide sales tax at all are Alaska, Delaware, Montana, New Hampshire, and Oregon, so the question rarely comes up there.
Who Qualifies to Buy Tax-Free
Exemptions fall into two broad buckets: exemptions tied to the buyer, and exemptions tied to what’s being bought or what it will be used for. The buyer-based ones are the ones most people mean when they ask about “getting” an exemption.
Nonprofits
Organizations recognized under Section 501(c)(3) of the Internal Revenue Code — charitable, religious, educational, and scientific groups — are the most common exempt buyers.1Office of the Law Revision Counsel. 26 USC 501 – Exemption From Tax on Corporations, Certain Trusts, Etc. A federal determination letter from the IRS does not, by itself, make your purchases tax-free at the state level. Most states require the nonprofit to apply separately for a state sales tax exemption. And the item has to be used for the exempt purpose. Office supplies for the charity’s own work usually qualify. Gifts for individual staff members do not.
Government Agencies
Federal agencies are immune from state sales taxes under the intergovernmental tax immunity doctrine, which comes out of the Supremacy Clause.2Congress.gov. Intergovernmental Tax Immunity Doctrine State and local agencies are generally exempt within their own state. Government buyers usually present a purchase card or a specific exemption letter rather than a general exemption certificate.
Religious Institutions and Schools
Churches, synagogues, mosques, and other houses of worship commonly qualify when the purchase relates to their religious mission. Public and private schools, colleges, and universities get similar treatment on educational supplies and equipment. The exemption does not stretch to purchases that have no connection to the organization’s core function.
Businesses Buying for Resale
Any business buying goods to resell them can buy those goods tax-free by giving the supplier a resale certificate. Sales tax is designed to be paid once, by the final consumer. If a retailer paid tax on inventory from the wholesaler and the customer paid tax again at the register, the same item would be taxed twice. Resale exemptions prevent that.
Which Products Are Commonly Exempt
Some exemptions attach to the product itself and apply to everyone, no certificate needed.
Groceries and Prescription Drugs
More than 30 states plus the District of Columbia exempt unprepared groceries from sales tax entirely, and several more tax them at a reduced rate. The line between exempt groceries and taxable prepared food can be very specific: a cold rotisserie chicken packaged for takeout may be exempt, while the same chicken sitting under a heat lamp counts as prepared food and gets taxed. Nearly every sales-tax state exempts prescription medications, and most exempt over-the-counter drugs or medical devices as well.
Manufacturing Inputs and Farm Supplies
Raw materials that become a physical part of a finished product are exempt in most states, because the finished product will be taxed when it reaches the consumer. Packaging and shipping materials often qualify too. Agricultural operations typically get exemptions on farm machinery, seeds, livestock feed, fertilizer, and veterinary supplies used in commercial production. The qualifier is “used directly in production.” A tractor that works the fields is exempt. A television in the farmhouse is not.
Clothing
A handful of states exempt most clothing year-round. Others limit the exemption to items below a set price. Accessories, athletic gear, and protective equipment are often excluded even where everyday clothing qualifies.
A Note on Services
Most states tax tangible goods and don’t tax services unless the service is specifically listed in the code. Only four states — Hawaii, South Dakota, New Mexico, and West Virginia — flip that default and tax most services unless a specific exemption applies. In the other states, professional services like legal advice, accounting, and consulting generally aren’t subject to sales tax to begin with, so no exemption certificate is needed. Repairs, telecommunications, and landscaping are taxable in many places, though, so check your state’s list rather than relying on the general rule.
How You Actually Claim the Exemption
This is where the paperwork lives. The mechanics come down to which certificate you use, and the distinction trips up plenty of buyers and sellers.
Resale Certificate
A resale certificate tells the seller you’re buying to resell, not to consume, so the seller shouldn’t collect tax. The Multistate Tax Commission publishes a Uniform Sales & Use Tax Resale Certificate that many states accept.3Multistate Tax Commission. FAQ – Uniform Sales and Use Tax Certificate Multijurisdictional The form asks for the buyer’s name, address, state registration or tax ID, and a description of the business, and it has to be signed by an owner, partner, or officer. The MTC form is only for resale and component-ingredient purchases. Buyers claiming any other type of exemption have to use a different form.4Multistate Tax Commission. Uniform Sales and Use Tax Resale Certificate – Multijurisdiction
Exemption Certificate
An exemption certificate covers everything that isn’t resale: a nonprofit buying supplies for its mission, a manufacturer buying production equipment, a government agency making a purchase. Most states publish their own forms, and the right form depends on the type of exemption being claimed. The Streamlined Sales Tax Governing Board offers a single exemption certificate accepted by all 24 of its member states, and it handles multiple exemption types on one form, including resale.5Streamlined Sales Tax. Exemptions Businesses that buy across many states often use the SST certificate to avoid tracking a different form for every jurisdiction.
Pick the Right Form
Using the wrong certificate is one of the most common compliance mistakes, and during an audit it’s treated almost the same as having no certificate at all. A retailer claiming resale needs a resale certificate, not a general exemption form. A nonprofit needs an exemption certificate showing its exempt status, not a resale certificate. Before any tax-free purchase, check which form your state requires for your specific exemption type. The forms live on your state’s Department of Revenue or Comptroller website.
At the Register
You fill out the certificate, hand it to the seller before or at checkout, and the seller drops the tax. For repeat purchases from the same vendor, most states let you leave a single “blanket” certificate on file instead of filling out a new one each time. The SST blanket certificate stays effective until you cancel it, as long as you make purchases at least once every 12 months.6Streamlined Sales Tax. Streamlined Sales Tax Certificate of Exemption Vendors have their own reason to look closely at what you hand them. If a seller accepts an invalid or incomplete certificate and the state audits the transaction, the seller is typically the one on the hook for the uncollected tax.
Sales tax holidays are a different animal. About 18 states hold short windows, usually a weekend, when specific categories like back-to-school clothing, school supplies, or storm-prep gear are tax-free for everyone.7Federation of Tax Administrators. 2025 Sales Tax Holidays These apply automatically at the register. No certificate, no application.
Keeping the Exemption Valid
A tax-free purchase comes with an ongoing obligation: you have to actually use the item for the exempt purpose you claimed. Pull inventory off the shelf for personal use, and you owe use tax on it. Reassign production equipment to a non-production role, and you owe use tax on it. Use nonprofit supplies for something outside the charitable mission, and you owe use tax on those too.
Use tax is charged at the same rate as sales tax. The only difference is that you self-report it instead of having a seller collect it. Businesses with a sales tax permit usually report use tax on their regular sales tax return. Those without a permit may need to file a separate one. It’s a frequent audit finding, and auditors look specifically for mismatches between the volume of tax-free purchases a business makes and the taxable sales it reports.
Records and Expiration
Every certificate you issue or receive should stay on file for your state’s record retention period. That’s three years in some states, four in others, and up to seven in a few, so keeping certificates for at least four years from the date of purchase is a safe baseline. Missing certificates are the single most common reason auditors reclassify exempt sales as taxable. If you can’t produce it, the exemption disappears and you owe the tax plus interest.
Expiration rules also vary. Some states issue certificates that stay valid indefinitely until revoked in writing. Others require renewal every few years. The SST blanket certificate lapses if no purchases happen for more than 12 months.6Streamlined Sales Tax. Streamlined Sales Tax Certificate of Exemption A yearly calendar reminder to review your certificates costs nothing and prevents finding out mid-audit that your biggest customer’s certificate expired two years ago.
If You Were Charged Tax by Mistake
If a seller charged you sales tax on a purchase that should have been exempt, either because you forgot to present your certificate or the seller didn’t process it, you can file a refund claim with your state’s tax authority. The claim usually asks for the original invoices showing the tax paid and a copy of your valid exemption certificate. Most states let you file online through their tax portal.
The filing window varies by state, generally somewhere between one and four years from the date of purchase. Processing runs from a few weeks to several months. Successful claims come back as a direct refund or a credit to your tax account. Wait past the statute of limitations and the overpayment is gone.
Penalties for Misusing an Exemption
Claiming an exemption you don’t qualify for is fraud, and states treat it seriously. Civil penalties for issuing a false certificate include fines that vary by state, and intentional tax evasion can bring felony charges carrying prison time. The buyer who signs the certificate holds the primary liability, but sellers who knowingly accept certificates they have reason to doubt can be penalized as well. Even honest mistakes — an expired certificate, the wrong form, a missing signature — can trigger assessments for the uncollected tax plus interest during an audit. Getting the paperwork right at the point of sale costs almost nothing. Fixing it after an auditor arrives costs a lot.