Idaho and Utah Sales Tax Exemptions on Farm Inputs

Farms buy a lot of things every year. Seed, feed, fertilizer, fuel, chemicals, parts, equipment, and structures. State sales tax on those inputs adds up. Both Idaho and Utah exempt many farm purchases from sales tax, but the two states do not exempt the same things and do not use the same paperwork.

Operations that farm in both states, or move equipment across the state line, end up navigating two sets of rules. Getting a category wrong means either paying sales tax that could have been avoided or facing a use-tax assessment months later when the auditor arrives. This walk-through covers what each state exempts, where the two diverge, and how to actually get the exemption at the register.

What Idaho exempts

Idaho provides a production-agriculture exemption for items used primarily in commercial farming or ranching. The core categories:

• Livestock and feed. Production animals and the feed for them.
• Seed and fertilizer. Seed for planting, commercial fertilizer, and soil amendments used in production.
• Chemicals. Herbicides, pesticides, and other production chemicals.
• Fuel. Fuel used in production, including farm-use dyed diesel and clear diesel used in qualifying equipment.
• Equipment. Machinery and equipment used primarily in production farming and ranching. “Primarily” is a use test, not a design test.

To claim the exemption at the point of sale, the buyer presents a completed Idaho Farmer Exemption Certificate on Form ST-101 to the seller. The certificate is a signed statement that the purchase qualifies. Sellers keep the certificate on file to support the exempt sale. Buyers should keep their own copy in case a vendor’s records are ever unavailable at audit.

What Utah exempts

Utah’s agricultural-production exemption covers a similar core set of purchases used in the commercial production of food, fiber, or other agricultural products. The categories:

• Feed, seed, and fertilizer used in production.
• Chemicals used in production.
• Fuel used in agricultural production.
• Machinery and equipment used primarily in agricultural production.
• Certain irrigation equipment.

Utah uses Form TC-721A, the Agricultural Producer Exemption Certificate. The buyer signs it, the seller keeps it on file, and the exempt sale is documented. Utah also has TC-721G for greenhouse and nursery operations with slightly different rules.

Where Idaho and Utah diverge

The core categories look similar. The details are where operations that farm in both states get caught:

• Utility vehicles and ATVs. Both states apply a “primarily used in production” test, but the practical treatment of dual-use vehicles differs. An ATV that also carries hunting gear on weekends is a fact-and-circumstance question in either state, but the two revenue departments have taken different positions in audit.
• Structures. Farm buildings themselves are usually taxed differently than the equipment inside them. Idaho and Utah both draw the line between real property and personal property with their own definitions.
• Repair parts. Both states generally exempt parts that go into exempt equipment. Documentation requirements differ.
• Custom farm services. Custom hire (harvesting, planting, spraying) is treated as an exempt service in some fact patterns and taxable in others. Both states have specific rules.

Farms operating in both states should not assume the Idaho rule applies to a Utah purchase. Check the current-year rule for each category in the state where the purchase occurs.

Getting the exemption at the point of sale

The exemption is only good if the buyer claims it correctly at checkout. Practical steps:

• Complete and sign the current-year exemption certificate (ST-101 for Idaho, TC-721A for Utah) before the first purchase of the year.
• Provide a copy to every vendor the operation buys from routinely. Many vendors keep it on file and apply the exemption automatically.
• For one-off vendors, hand the certificate to the cashier at the counter. Many farm-supply retailers have a scanning process.
• Keep a folder or digital copy of the certificate at hand. If the auditor asks for support, the buyer’s copy is the evidence.

If the exemption was missed at the register, most states allow a refund claim to the vendor or a use-tax credit on the next filing. The mechanics vary. It is faster to get it right at checkout.

When you owe use tax anyway

Use tax fills the gap when a farmer buys something out of state and brings it home. If an Idaho farmer buys a used tractor from a private seller in Oregon and hauls it to Bingham County, Idaho use tax applies to the extent Oregon sales tax was not paid. The exemption still applies if the item qualifies as production equipment, but the buyer needs to document the exempt use.

Personal-use items purchased on the farm account (a hunting ATV registered to the operation, an office computer used for family purposes) do not qualify for the exemption. Mixed-use items require a use test.

This overview is general information, not tax advice for your specific operation. Talk with Cooper Norman’s ag accounting team about applying the exemption correctly and use tax planning across state lines if your operation crosses the Idaho and Utah line. Reach out to Cooper Norman for a certificate review before the next planting season.