Exempt sales are transactions that state law specifically excludes from sales tax, even though the goods or services involved would normally be taxable. Forty-five states and the District of Columbia impose a general sales tax, and every one of them carves out categories of purchases that are tax-free. The reasons vary: keeping essentials like groceries and medicine affordable, preventing the same product from being taxed at every step of a supply chain, or avoiding the pointless exercise of one government agency charging tax to another. The rules differ state by state, but the major categories, and the paperwork needed to claim them, follow a consistent pattern.
Why States Grant Exemptions
Sales tax is meant to be a consumption tax. The idea is to tax a product once, at the point where someone actually uses it. Without exemptions, that principle falls apart. A manufacturer buying steel, a wholesaler buying finished tools, and a retailer stocking shelves would each pay tax on the same product before a consumer ever touches it, and each layer of tax would be baked into the final price.
Legislatures also use exemptions to hold down the cost of necessities. Taxing groceries and prescription drugs raises the cost of living for everyone, but the burden falls hardest on lower-income households that spend a larger share of their income on basics. Most states have decided the lost revenue is worth it.
Exemptions Based on What Is Sold
Some exemptions turn on the product itself. Anyone buying the item gets the tax-free treatment.
Groceries
Of the 45 states that charge sales tax, roughly 32 fully exempt groceries at the state level. The rest either tax groceries at the full rate or apply a reduced rate. Definitions matter here. “Groceries” generally means unprepared food intended for home consumption. A bag of rice qualifies. A hot rotisserie chicken from the deli counter usually does not. Prepared meals, whether from a restaurant or a grocery store’s ready-to-eat section, stay taxable in most places. Local jurisdictions can also add their own taxes on top of state rates, so shoppers may still see a small tax on the receipt even in states that exempt groceries at the state level.
Prescription Drugs and Medical Equipment
Prescription medications are exempt in virtually every state with a sales tax. Many states extend the exemption to durable medical equipment such as wheelchairs, prosthetics, and oxygen supplies. Over-the-counter medications get less consistent treatment: some states tax them, others exempt them. Dietary supplements land in a grayer zone and are taxable in most jurisdictions.
Sales for Resale
The resale exemption is the single most important exemption for businesses, and it is built into how sales tax works. When a wholesaler sells inventory to a retailer, that sale is exempt because the retailer plans to sell the product to a consumer and collect tax at that final point of sale. Without this exemption, the same product would be taxed at every stage of distribution.
There is a catch. A business that buys something tax-free for resale but then uses it internally, say, pulling a laptop off the shelf for its own office, owes use tax on that item at the same rate the sales tax would have been. State auditors specifically look for inventory items purchased tax-free but never actually resold.
To claim the resale exemption, the buyer gives the seller a resale certificate at the time of purchase. The seller keeps that certificate on file as proof it was right not to collect tax. If the seller can’t produce the certificate during an audit, the sale is treated as taxable and the seller owes the tax.
Exemptions Based on Who Is Buying
Nonprofit Organizations
Organizations recognized as tax-exempt under Section 501(c)(3) of the Internal Revenue Code, those organized for charitable, religious, educational, or scientific purposes, often qualify for state sales tax exemptions as well. Federal recognition alone is not always enough. Many states require nonprofits to apply separately for a state-level sales tax exemption certificate, even if the organization already holds IRS 501(c)(3) status.1Internal Revenue Service. Exemption Requirements – 501(c)(3) Organizations The exemption typically covers purchases the organization makes for its exempt mission, not personal purchases by employees or items used for unrelated commercial activity.
Government Agencies
Federal, state, and local government agencies are exempt from sales tax in most states. Charging a state agency sales tax just moves money from one government pocket to another. One detail trips people up: if a government employee pays with personal funds and gets reimbursed later, the purchase is generally still taxable. The payment has to come directly from government funds for the exemption to apply.2GSA SmartPay. Frequently Asked Questions
Exemptions Based on How the Item Is Used
Manufacturing Equipment
The vast majority of states exempt machinery and equipment used directly in manufacturing. Only about eight states and the District of Columbia offer no version of this exemption. Details vary, but the core idea is consistent: equipment that transforms raw materials into finished products qualifies, while office furniture, administrative computers, and items used after production is complete generally do not. Some states apply a “primary use” test that requires the equipment to be used more than 50 percent of the time in actual production to qualify.
Agricultural Inputs
Most states also exempt agricultural inputs such as seed, fertilizer, livestock feed, and farm machinery. The scope varies. Some states exempt nearly every input a working farm uses, while others limit the exemption to items directly consumed in producing food for human consumption or feed for food animals.
Sales Tax Holidays
About 20 states offer temporary sales tax holidays, most commonly timed around back-to-school shopping in late summer.3Federation of Tax Administrators. 2025 Sales Tax Holidays During these windows, specific categories of products, typically clothing, school supplies, and sometimes computers, can be purchased free of state sales tax, usually up to a per-item price cap. A state might exempt clothing priced at $100 or less per item, for example, while a $150 jacket remains taxable. Some states also run holidays for emergency preparedness supplies or energy-efficient appliances. The definitions are tightly drawn, and retailers are responsible for knowing exactly which items qualify.
Exemption Certificates: Proving the Sale Was Exempt
Every exempt sale needs a paper trail. The buyer provides the seller with an exemption certificate or resale certificate at the time of purchase, and the seller keeps it on file. That certificate is the seller’s proof it was correct not to collect tax. Without one, every sale defaults to taxable.
What the Certificate Must Include
Forms vary by state, but exemption certificates generally require the buyer’s legal name and address, the reason for the exemption (resale, nonprofit status, government entity, and so on), the buyer’s state tax registration or identification number, and an authorized signature. For resale certificates specifically, the buyer is certifying that the purchased items will be resold in the ordinary course of business.
Multistate Certificates
Businesses that buy or sell across state lines can cut down on paperwork using two widely accepted forms. The Multistate Tax Commission’s Uniform Sales and Use Tax Resale Certificate is accepted in 36 states.4Multistate Tax Commission. Uniform Sales and Use Tax Resale Certificate – Multijurisdiction The Streamlined Sales Tax Exemption Certificate is accepted by all 23 full member states of the Streamlined Sales and Use Tax Agreement.5Streamlined Sales Tax Governing Board. Exemptions
How Long Certificates Stay Valid
Validity depends entirely on the state. Some states issue certificates that remain valid indefinitely as long as the information stays accurate. Others require annual renewal. A few set fixed expiration periods of five or ten years. An expired certificate is treated the same as a missing one during an audit.
When an Exemption Does Not Apply: Use Tax
Use tax is the backstop that prevents exemptions and cross-border purchases from creating permanent tax gaps. Federal law defines it as a tax imposed on the use, storage, or consumption of an item, complementary to the general sales tax.6Legal Information Institute. 26 USC 164(b)(5) – Definition of Compensating Use Tax The rate matches the sales tax rate.
Two situations come up most often. First, when a business buys an item tax-free using a resale certificate but then uses it internally instead of reselling it. Second, when someone buys a taxable product from an out-of-state seller who did not collect tax. In both cases, the buyer owes use tax to their home state. Most businesses self-report use tax on their regular sales tax returns.
Seller Liability and Audit Risk
In most states, every sale is presumed taxable, and the seller bears the burden of proving that an exemption applies. If a state auditor asks for certificates and you can’t produce them, every affected transaction is reclassified as taxable. You owe the full tax plus interest, and in many states, penalties on top of that.
A valid certificate accepted in good faith generally shifts liability to the buyer. Courts have consistently held that when a seller collects a properly completed certificate and the buyer later turns out to have misused the exemption, the seller is not on the hook for the unpaid tax. The buyer is. “Good faith” is the operative phrase. Accepting a clearly implausible certificate, one where the claimed use makes no sense given what was purchased, can strip away that protection. Selling 500 units of inventory to a registered retailer raises no eyebrows. Selling a personal watercraft to an accounting firm using a resale certificate should.7Multistate Tax Commission. Uniform Sales and Use Tax Resale Certificate – Multijurisdiction
Record Retention
States typically require businesses to keep exemption certificates on file for three to five years, though some states extend that window. The safest practice is to retain them at least as long as the state’s audit lookback period. Many tax professionals recommend keeping certificates indefinitely in digital form, given how cheap storage is relative to the cost of a failed audit.
Common Audit Triggers
Auditors focus on a few predictable weak spots: certificates missing entirely, certificates with incomplete information such as a missing signature or tax ID number, expired certificates that were never renewed, and sales where the exempt product does not match the buyer’s stated line of business. If your certificate file has gaps, the time to fix them is before the audit notice arrives. Most states allow sellers to collect retroactive certificates from buyers to cure missing documentation, but the window closes once an audit begins.