A federal agency orders supplies. The invoice or card receipt comes back with a tax line. The buyer asks why, the supplier says the system added it, and a correction cycle starts. It is one of the most common small frictions in government buying, and it is almost always fixable.
This article explains the supplier's side: why federal purchases are generally exempt, why tax still shows up, how to fix it, and a note on resale certificates between a reseller and a manufacturer. It is general information. State rules differ, and this is not tax advice.
The rule in one paragraph
Purchases by the federal government are generally immune from state and local taxation. FAR 29.302 says so directly: "Generally, purchases and leases made by the Federal Government are immune from State and local taxation." The same section tells agencies to take maximum advantage of available exemptions, and says the contracting officer provides, where appropriate, a U.S. Tax Exemption Form (SF 1094) or other evidence that the Government is the buyer. Whether a specific purchase qualifies is a legal question, and the regulation says it is for agency counsel.
For a supplier selling goods to a federal agency, the starting position is that no state or local sales tax belongs on the invoice.
Why tax still shows up
Tax appears on federal orders for a handful of repeat reasons.
Vendor setup
Most invoicing and e-commerce systems charge tax by default. Someone has to mark the customer as exempt, and a new federal customer is easy to miss. Where the system calculates tax by ship-to address, an order that ships to a federal building in a state with sales tax gets taxed unless the account is flagged. This is the most common cause and the easiest to fix.
Card type
How the purchase is paid matters. GSA's SmartPay program draws a line between centrally billed accounts (the government is billed and liable) and individually billed accounts (the cardholder is billed and liable). GSA says in Smart Bulletin 020 that centrally billed accounts are exempt from direct state sales tax in all states and territories, while states are not required to honor the exemption for individually billed accounts, though many do. Government purchase cards are centrally billed. Travel cards are often individually billed, and tax rules there depend on the state and the card. A supplier selling supplies on a purchase card is generally in the centrally billed case. A supplier whose customer is paying with an individual card should expect a different result and may need to check the state.
Documentation
Some states want an exemption form or certificate on file before they will let a vendor skip collecting tax. GSA notes that states set their own documentation rules and that the federal government cannot dictate them. Its SmartPay tax pages by state list each state's position, forms and contacts. A vendor that cannot show documentation may still charge tax even on an exempt purchase.
Taxes that apply to the seller, not the buyer
A few states tax the seller's gross receipts rather than charging the buyer a sales tax. This is a different tax. GSA's Smart Bulletin 020 says that on centrally billed account transactions this charge is not considered a sales tax and is allowable, and that merchants are not required to pass it on. A state example makes this concrete: on its state page, GSA says that in Hawaii, a sale to the federal government is exempt from the general excise tax and the vendor may claim a deduction, but if the vendor does not claim it, the tax assessment is allowable because it is not a state sales tax. See the Hawaii page for the wording, and check any other state's page before you assume its rule.
So a tax line on a federal invoice is not always an error. It may be a gross receipts charge that the vendor chose to pass along. The buyer is entitled to ask what it is, and the supplier should be able to say.
Federal excise taxes and tariffs
Exemption covers state sales tax. GSA's SmartPay FAQ says federal excise taxes still apply and tariffs must be paid. A product that carries a federal excise tax built into its price is a separate matter from a sales tax added at checkout.
How to fix a tax charge made in error
If tax was charged on an order that should have been exempt, here is the usual path.
- Identify what the charge is. Ask the vendor to name the tax. Sales tax, gross receipts tax and a federal excise tax are three different things.
- Request a refund or credit in writing. The buyer or cardholder sends the vendor the order number, the invoice or receipt, the amount and a request to remove or refund the tax.
- Attach exemption documentation. Include the proof the state requires: a state exemption form, a copy of the order showing the federal buyer, or an SF 1094 if the agency provides one. GSA's state pages say what each state expects.
- Fix the account. The vendor flags the customer as exempt so the next order does not repeat the error.
- Escalate if needed. If the vendor refuses, GSA's guidance for cardholders is to find a merchant that will honor the exemption, and the agency's card program coordinator can help. A vendor that collected tax in error may also need to correct it with its state revenue department.
For the supplier, the faster move is to handle this before the invoice goes out. Ask the buyer at order confirmation whether the purchase is tax exempt and what paperwork they have. We cover other items of a complete order in what a complete supply quote includes.
Resale certificates between a reseller and a manufacturer
This is a separate issue from the federal exemption. When a reseller buys goods from a manufacturer to resell, many states let the reseller buy without paying sales tax by giving the manufacturer a resale certificate (sometimes called a resale or exemption certificate). That certificate documents that the purchase is for resale. Rules on who can issue one, what form it takes, how long it lasts and what the seller must keep vary by state. A manufacturer shipping to a reseller should ask for the certificate the manufacturer's state requires before it ships, and a reseller should keep its certificate current. Neither this article nor the federal exemption settles that question for you. Check your state revenue department.
What suppliers should do
- Mark federal customers as exempt in your invoicing system and keep the supporting documentation.
- Ask at order confirmation whether tax applies and what the buyer will provide.
- If a gross receipts tax applies to you, decide whether to absorb it or pass it on, state it clearly and price it into the delivered quote.
- Treat a tax question from a buyer as a request for an explanation, not a dispute.
- Correct errors quickly with a credit, not a debate.
How Lunula Supply handles it
We confirm every order line by line in writing and raise mismatches on day one, which includes questions about price and charges. We send representations and paperwork with the quote or order, and we keep one contact from acknowledgment through warranty, so a tax question has one place to land. For anything specific to your state or your tax position, ask your state revenue department or a tax professional.
If you are placing a federal order and want a clean invoice, contact us or see what we supply.
Frequently asked questions
Are federal government purchases exempt from sales tax?
Generally yes. FAR 29.302 says purchases and leases made by the Federal Government are generally immune from state and local taxation. How that plays out at the register depends on who is liable for payment and on state documentation rules, so check your state's page on smartpay.gsa.gov.
Why did sales tax appear on a federal invoice?
The usual causes are vendor setup that taxes by default, a card type that is not centrally billed, missing documentation, or a gross receipts tax that applies to the seller. Ask the vendor to name the tax. If it was charged in error, request a refund with the order and exemption documentation.
Is a gross receipts tax the same as a sales tax?
No. A gross receipts tax is imposed on the seller's income from sales, while a sales tax is imposed on the buyer's purchase. GSA says a merchant may pass a gross receipts tax along and that it is not treated as a sales tax on centrally billed account transactions.
Does a resale certificate matter for government orders?
It matters between a reseller and a manufacturer, not between the reseller and the agency. A resale certificate documents that the reseller is buying goods for resale. The rules are set by each state, so check yours.
General information, not tax advice, and state rules vary. References were checked against acquisition.gov and smartpay.gsa.gov on the publish date. Ask your state revenue department or a tax professional about your situation.