Sales Tax Exemptions for Online Sellers

Resale Exemptions

The resale exemption is the most common exemption ecommerce sellers encounter. When a buyer purchases products from you for the purpose of reselling them rather than using them, the transaction is exempt from sales tax because the tax will be collected later when the product is sold to the final consumer. This prevents double taxation on the same product.

To claim a resale exemption, the buyer must provide you with a valid resale certificate from the state where the products will be resold. The certificate includes the buyer's business name, address, sales tax permit number, a description of the products being purchased for resale, and a signature. You must verify that the certificate is valid and keep it on file. In an audit, the state will request certificates for every exempt transaction, and sales without valid certificates on file are treated as taxable with the tax owed by you.

Resale certificates are state-specific, meaning a certificate from California only exempts purchases that will be resold in California. If a buyer resells in multiple states, they may need to provide certificates for each state. The Multistate Tax Commission's Uniform Sales and Use Tax Certificate is accepted by approximately 38 states and simplifies multi-state resale documentation.

Nonprofit and Charitable Exemptions

Qualifying nonprofit organizations are exempt from sales tax on their purchases in most states, though the scope of the exemption varies significantly. Some states exempt all purchases by organizations with 501(c)(3) tax-exempt status. Other states limit the exemption to purchases made in furtherance of the organization's charitable mission, taxing purchases for non-charitable activities. A few states provide no general nonprofit exemption at all.

To honor a nonprofit exemption, collect the organization's exemption certificate or letter, which typically includes their IRS determination letter (confirming 501(c)(3) status), the state-specific exemption number issued by the state's department of revenue, and the organization's name and address. Not every nonprofit has a state sales tax exemption even if they have federal tax-exempt status. The state exemption is separate and must be applied for independently in each state.

Government Exemptions

Sales to federal, state, and local government entities are generally exempt from sales tax in every state. Federal government purchases are exempt under the supremacy clause of the US Constitution. State and local government purchases are typically exempt under each state's sales tax law. Government buyers often use a government purchasing card (GPC) or provide a government exemption letter.

For ecommerce sellers, government sales are relatively rare in consumer-facing stores but common for sellers of office supplies, equipment, technology, and other products that government agencies purchase. If you receive orders from government entities, verify the buyer's government status through their email domain (.gov, .mil, .edu for public educational institutions), purchasing card, or exemption documentation.

Manufacturing and Agricultural Exemptions

Many states exempt purchases of raw materials, machinery, and equipment used directly in manufacturing or agricultural production. These exemptions are relevant to ecommerce sellers who also manufacture their own products (buying raw materials for production) or who sell to manufacturers and farmers. The scope varies by state: some exempt all manufacturing inputs, while others limit the exemption to specific categories of machinery or materials directly consumed in the production process.

If you sell products that could qualify for a manufacturing or agricultural exemption, your B2B customers in those industries may provide exemption certificates specific to their activity. Process these the same way as resale certificates: verify the certificate, store it on file, and apply the exemption to qualifying transactions.

Product-Specific Exemptions

Many states exempt entire categories of products from sales tax. The most common product-specific exemptions include grocery food (exempt or reduced-rate in approximately 30 states), prescription medications (exempt in all states), medical devices with a prescription (exempt in most states), clothing (exempt in Pennsylvania, New Jersey, Minnesota, and New York under $110), agricultural supplies (exempt in most states), and certain energy products like residential heating fuel.

These exemptions apply automatically based on the product type and the customer's state, not based on the buyer's status. You do not need an exemption certificate to sell exempt groceries in a state that exempts food. Instead, you need to correctly classify your products in your tax software so the system applies the correct tax treatment. See our product taxability guide for detailed state-by-state coverage of exempt product categories.

Sales Tax Holidays

Approximately 20 states hold annual sales tax holidays where specific categories of products are temporarily exempt from sales tax for a period of 2 to 7 days. The most common type is the back-to-school holiday in late July or August, which exempts clothing, school supplies, and sometimes computers and electronics under a price threshold ($100 to $200 per item is typical). Other holidays focus on hurricane preparedness supplies, Energy Star appliances, or Second Amendment products.

During a sales tax holiday, your ecommerce platform or tax software needs to recognize the holiday period and exempt qualifying products automatically. Major platforms like Shopify Tax, TaxJar, and Avalara handle sales tax holidays in their rate databases. If you manage tax manually, you need to track each state's holiday dates and adjust your collection settings for the holiday period, then revert them when the holiday ends.

Sales tax holidays create customer service considerations for ecommerce sellers. Orders placed during the holiday period but shipped after it ends are typically exempt based on the order date in most states, but some states use the delivery date. Clarify each state's rule to avoid charging tax on orders that should be exempt or exempting orders that should be taxable.

Managing Exemptions on Your Store

Every ecommerce platform supports tax-exempt customer accounts. On Shopify, go to a customer's profile and check the tax-exempt box. On WooCommerce, use a tax exemption plugin or manually configure customer roles. On BigCommerce, assign customers to a tax-exempt group. Once flagged, future orders from that customer process without sales tax.

For B2B sellers with frequent exempt transactions, dedicated exemption certificate management software is worth the investment. Avalara CertCapture, Exemptax, and TaxJar's exemption features store certificates digitally, track expiration dates, send renewal reminders, and provide audit-ready reporting. This is significantly more reliable than a file cabinet of paper certificates or a folder of scanned PDFs.

The documentation standard for exemption certificates is to collect and verify the certificate before the first exempt transaction. Accepting an exemption after the sale and retroactively adjusting the tax is messy and may not be accepted as valid documentation in an audit. Establish a process where exempt customers provide their certificate at account creation or first order, and store it immediately.

Audit Risk From Exemptions

Exemptions are a primary focus area in sales tax audits. Auditors review exempt transactions to verify that valid certificates are on file and that the exemption was legitimately applied. Transactions without proper documentation are reclassified as taxable, and you owe the tax plus penalties and interest. For sellers with significant exempt revenue, missing or expired certificates can create substantial audit liabilities.

Best practices for minimizing audit risk include collecting certificates before the first exempt sale rather than after, verifying that the certificate covers the correct state and product type, tracking certificate expiration dates (most are valid for 3 to 5 years), requesting updated certificates before the current one expires, and storing all certificates in an organized, searchable system that auditors can access quickly. A well-organized exemption certificate file is the difference between a smooth audit and an expensive one.