Idaho Contractor Taxes and Licensing Guide

Idaho treats a contractor who improves real property as the end user of the materials. You pay the 6% sales or use tax when you buy them, and you don't add sales tax to the customer's bill. Labor on those jobs isn't taxed. You also register with DOPL, and trades like electrical need a license.

Do Idaho contractors charge sales tax on labor?

Not on a job that improves real property. The Idaho State Tax Commission puts it in one line: "Idaho sales tax law says contractors are the consumers (end users) of all the goods they use." Because you're the consumer, the tax happens at your end of the deal, when you buy lumber, wire, pipe or shingles. Your invoice to the homeowner or builder carries no sales tax, labor or materials.

The Commission says it plainly: "A contractor doesn't charge sales tax to the customer." If you put tax on the bill anyway and the customer pays it, the Commission says you "must report and pay the sales tax collected to the state." So adding tax by mistake doesn't let you skip it at the supply house. You'd pay it twice. Our labor vs. materials guide shows how this setup compares with states that tax the full contract.

Watch the line between contracting and retailing. When you sell goods without installing them, you're a retailer for that sale. The Commission's guide says a retailer "must collect sales tax on the full retail sales price of the cabinets, including the labor to make them," and a retailer needs a seller's permit. Shops that do both, like a cabinet maker who also installs, need to sort each sale into the right bucket.

When do you owe Idaho use tax on materials?

Use tax is the backstop for anything you bought without paying Idaho tax: an online order, a load picked up in a state with no sales tax, or tools shipped from a vendor that didn't collect. The Commission's basics guide says "Idaho's sales tax rate is 6%. Idaho's use tax rate is also 6%." On timing, the contractor guide says "the tax is due as soon as the contractor has the right to use or store the property." Our use tax for contractors page walks through how to track it.

• Exempt customers don't pass it down. Working for a school, church or other exempt buyer? The Commission says "the exemption doesn't carry over to the contractor." You still pay tax on the materials.
• Form ST-103C. This is the Sales Tax Exemption Certificate for real property contractors. The Commission says real property contractors should use it instead of Form ST-101, and contractors whose business is mostly retail may use it to buy materials without tax.
• Jobs across the line. The Commission says "a special exemption applies to contractors working in states with no sales tax (e.g., Montana, Oregon, and Alaska)." Materials delivered to you in Idaho for those jobs can be bought without Idaho tax under the rules in the guide.
• Tax already paid elsewhere. If you paid another state's tax at a rate equal to or higher than Idaho's, the guide explains how that counts against Idaho use tax.

Which Idaho licenses and registrations do contractors need?

General and specialty builders in Idaho don't sit for a state license exam. DOPL's FAQ says "the Act requires registration, not licensure." Registration applies to anyone doing a construction job over $2,000 in materials and labor who isn't exempt. You show general liability coverage of "not less than $300,000 single limit" and either workers' comp or a reason you don't need it. Electrical, plumbing and HVAC each have their own board and license, and the contractor license guide explains how registration and licensing differ.

Public work is its own track. DOPL's fact sheet lists seven classes, from C (bid limit $200,000) to Unlimited, set by your company's net worth and working capital. Planning to bid city, county or school jobs? Sort out the class before bid day.

What income tax does an Idaho contractor pay?

Idaho taxes personal income, and profit from a sole proprietorship or pass-through LLC flows to your personal return. The Tax Commission's rate schedule for 2025 shows a 0% bracket up to $4,811 for single filers ($9,622 married), then 5.3% on income above that. The schedule had no 2026 table when we checked on 2026-10-19. Two 2026 bills that would have changed the rate (House Bills 589 and 782) showed no action past printing on the Legislature's site, so confirm the 2026 rate with the Commission before you file.

If you hire, the Commission's contractor guide notes you must have an Idaho income tax withholding account. Plan federal and state payments together with the quarterly estimated tax calculator, and ask a CPA how corporate or S corp filings change the picture for your entity.

Is workers' comp required for Idaho contractors?

Yes, once you have a worker. The Idaho Industrial Commission's Facts for Employers says "employers with one or more full-time, part-time, seasonal, or occasional employees are required to maintain a workers' compensation policy, unless specifically exempt by law," and coverage must be in effect before the employee starts. Sole proprietors, working partners and LLC members are exempt from mandatory coverage but can elect it. Calling a helper a sub doesn't settle it: the Commission says contract workers "may be considered employees."

Idaho lets you shop the policy. The brochure lists almost 400 authorized private insurers, the Idaho State Insurance Fund, an NCCI-run assigned risk pool for employers who get turned down, and self-insurance for large employers. Going bare is expensive: the Commission says you can be personally liable for an injured worker's benefits plus a 10% penalty, and a penalty of $2 per employee per day or $25 per day, whichever is greater. Our workers' compensation page explains how premiums are set.

Are there local sales taxes in Idaho?

• Resort city taxes. The Tax Commission says "some Idaho resort cities have a local sales tax" on top of the state rate. Some cities limit it to lodging, liquor by the drink and restaurant food. Check with the city before you buy materials there.
• Auditorium districts. Some areas have auditorium district taxes, which mostly hit lodging. Ask the district if you're unsure.
• Liens. Idaho has its own deadlines for mechanics liens. Learn them before a slow payer forces the issue.
• Working next door. Montana has no general sales tax but runs its own contractor license, and Washington handles contractor tax its own way. Read the neighbor's page before you bid across the line.