Business-to-business sales usually don't require state sales tax, but there are common exceptions

Most business-to-business (B2B) transactions are exempt from state sales tax because the buyer is purchasing goods or services for resale or use in their own business operations, not for personal consumption. The sale is taxed later when the final product reaches a consumer. However, this exemption is not automatic—it depends on what is being sold, how it will be used, and whether the buyer provides proper documentation to the seller.

The key rule is that sales tax applies to the final sale to a consumer. When a manufacturer sells materials to a distributor, or a distributor sells to a retailer, no sales tax is charged at those steps. The retailer then charges sales tax when they sell to you. If a B2B transaction skips that final consumer step—for example, a business buying office supplies for its own use—sales tax usually applies because there is no resale happening.

Key Takeaways

  • B2B sales of goods for resale are exempt from state sales tax in all 50 states, but the buyer must provide a resale certificate to the seller.
  • B2B sales of services, equipment, or supplies for a business's own use are usually taxable, even though both parties are businesses.
  • The exemption depends on the buyer's intended use, not on whether the seller is a business—a business buying office furniture for its own office pays sales tax.
  • Each state defines which items and services may have access to for exemption differently, so the same transaction may be taxed in one state and exempt in another.
  • A seller who charges tax when they should not have, or fails to charge tax when required, can face penalties from the state tax authority.

When B2B sales are exempt from sales tax

A B2B sale is exempt when the buyer holds a resale certificate (also called a reseller's permit or sales tax exemption certificate) and is purchasing goods specifically to resell them. The buyer must provide this certificate to the seller before or at the time of purchase. Without it, the seller has no legal protection for not charging tax.

The resale certificate tells the state that the buyer is a registered reseller and that the goods will be sold again, not consumed by the business itself. This is why a retailer buying inventory from a wholesaler pays no sales tax—the retailer will charge tax when the item is sold to a customer. The same applies to a manufacturer buying raw materials from a supplier, or a restaurant buying food from a distributor.

Each state issues its own resale certificates and sets its own rules about who can hold one. Most states require the buyer to register for a sales tax permit first, which involves providing a business license or federal employer identification number (EIN). The certificate itself is usually free, but the buyer must renew it periodically—often every three to five years, depending on the state.

When B2B sales are taxable

A B2B sale is taxable when the buyer is purchasing for their own business use, not for resale. This is true even though both parties are businesses. A law firm buying office chairs, a construction company buying tools, or a restaurant buying kitchen equipment all pay sales tax on those purchases because the items are being consumed or used by the business, not resold.

Services are almost always taxable in B2B transactions. When a business hires an accountant, a plumber, a marketing consultant, or a cleaning service, sales tax usually applies to the service fee. Some states exempt certain services—such as professional services like accounting or legal information—but most do not, and the rules vary widely by state.

Utilities and fuel used by a business are typically taxable as well. A manufacturing plant buying electricity or natural gas pays sales tax on those purchases. Some states offer exemptions for large industrial users or for fuel used directly in production, but these are exceptions, not the rule.

How the resale certificate process works

To buy goods tax-free for resale, a business must first obtain a resale certificate from the state where it is located. This usually requires registering with the state's department of revenue or tax authority and providing proof of business status. The process is often free and can be completed online.

Once the certificate is issued, the buyer provides a copy to each supplier they purchase from. Some suppliers keep the certificate on file; others ask for a new copy with each order. The seller is then legally protected from collecting sales tax on that transaction. If the buyer later uses the goods for their own business instead of reselling them, the buyer—not the seller—is responsible for paying the tax they avoided.

A buyer who loses their resale certificate or whose certificate expires must renew it before making tax-free purchases. Selling goods without a valid certificate in hand can result in the seller being liable for the unpaid tax, plus interest and penalties.

State-by-state differences in B2B tax rules

Sales tax rates and exemptions vary significantly by state. Some states exempt certain types of goods or services that other states tax. For example, a few states do not charge sales tax on groceries, while most do. Some states exempt manufacturing equipment, while others do not. A business operating in multiple states must understand the rules in each one.

Five states—Alaska, Delaware, Montana, New Hampshire, and Oregon—do not charge state sales tax at all, though some allow local sales taxes. In these states, B2B transactions are not subject to state sales tax, though the buyer may still owe local tax depending on the county or city.

A business that sells across state lines should verify the tax rules in each state where it has customers. What is exempt in one state may be taxable in another. Working with a tax professional or using tax software that tracks state rules by location can help prevent mistakes.

What happens if a seller charges tax incorrectly

If a seller charges sales tax on a B2B sale that should have been exempt, the buyer can request a refund. The buyer should provide proof that they held a valid resale certificate at the time of purchase. Most states allow refunds for overcollected tax, though the process and time limit vary.

If a seller fails to charge tax on a sale that should have been taxed, the state tax authority can hold the seller responsible for the unpaid tax, plus interest and penalties. This is why sellers need to verify that a resale certificate is valid and current before accepting it. A seller who knowingly accepts a false certificate or sells to someone without one when tax should explore faces serious penalties.

Buyers should also be aware that misusing a resale certificate—buying goods with one and then using them for personal or business consumption instead of reselling them—is tax evasion. The buyer is responsible for paying the tax they avoided, and the state can assess penalties.

Documentation and record-keeping for B2B sales

Both buyers and sellers should keep clear records of B2B transactions. Sellers should keep copies of resale certificates on file for at least three to seven years (the requirement varies by state) in case of an audit. Buyers should keep records showing what they purchased, when, and whether they resold it or used it in their business.

If a state audits a business, the first thing auditors look for is whether the right tax was charged or not charged. A seller without a copy of the buyer's resale certificate cannot prove the sale was exempt. A buyer without records of resale cannot prove they should have been exempt. Good documentation protects both parties.

Digital records are acceptable in most states, but some still prefer paper copies. When in doubt, keep both. A photograph of a resale certificate or a scanned copy stored securely is sufficient for most state audits.

Frequently Asked Questions

Do I have to charge sales tax if the buyer says they have a resale certificate but doesn't show it?

No. You should charge sales tax unless the buyer provides a valid, current resale certificate before or at the time of sale. If they promise to send it later, charge tax now and issue a credit if the certificate arrives and is valid. Do not rely on a verbal promise or an email saying they have one.

What if I'm a business buying from another business and I don't have a resale certificate?

You will pay sales tax on the purchase. If you plan to resell the goods, you should obtain a resale certificate from your state's tax authority before making future purchases. The process is usually free and takes a few days to a few weeks.

Are digital services and software subject to sales tax in B2B sales?

It depends on the state. Some states tax software and digital services; others exempt them. A few states distinguish between software you buy once and software you subscribe to monthly. Check your state's rules or ask your software vendor what tax applies to your purchase.

Can a business in one state buy from a business in another state tax-free?

Only if the buyer has a resale certificate and is purchasing goods to resell in their own state. The resale certificate is issued by the buyer's home state, not the seller's state. The seller should accept it as long as it is valid and current.

What should I do if I was charged sales tax on a B2B purchase that should have been exempt?

Contact the seller and provide proof that you held a valid resale certificate at the time of purchase. Ask for a refund or credit. If the seller refuses, you can file a claim with your state's tax authority, though the process and time limit vary by state.