Idaho Sales Tax Nexus: Economic Nexus Threshold and Rules for Online Sellers
Idaho Sales Tax Nexus: Economic Nexus Threshold and Rules for Online Sellers
If you sell to customers in Idaho from outside the state, the question is not whether Idaho sales tax applies to you. The question is whether you have enough connection with Idaho to be required to collect it. That connection is called nexus. Idaho recognizes several kinds, and the one most online sellers run into is economic nexus, which applies once your Idaho sales pass $100,000. This guide explains how the Idaho State Tax Commission applies each rule, what it means in practice, and what to do next.
This is informational content, not legal or tax advice. Sales tax rules change, and small differences in your facts (where your inventory sits, how you ship, whether you sell through marketplaces, whether you pay referral partners) can change the answer. Talk to a qualified CPA or attorney before you make decisions about current filings or past exposure.
The rate and who collects it
Idaho's state sales tax rate is 6%. Idaho has no local sales tax outside of voter-approved resort cities. For most online sales, the 6% state rate is the whole rate. If your customer is in a resort city that has its own voter-approved tax, confirm the local rate with that city and with the Tax Commission before you charge it.
Nexus decides whether you must collect that rate at all. Idaho uses four tests: physical presence, economic nexus, click-through nexus, and marketplace facilitator rules. A seller can trigger more than one.
Physical presence: collect from the first sale
Physical presence creates nexus immediately, with no dollar threshold. You have a physical presence in Idaho if you have any of the following:
- An office in Idaho
- A warehouse in Idaho
- Stock of goods held in Idaho, including inventory stored at an Idaho fulfillment center
- Representatives who sell, deliver or take orders in Idaho
Once any of these exists, you collect Idaho sales tax from your first Idaho sale. Check this list before you assume a fulfillment arrangement keeps you clear of nexus. Where your inventory physically sits is one of the most common ways online sellers acquire nexus without noticing.
Economic nexus: the $100,000 threshold
Idaho's economic nexus rule has been in effect since June 1, 2019. An out-of-state retailer with no physical presence in Idaho must collect Idaho sales tax when its Idaho sales exceed $100,000 in the current or previous calendar year.
Three details matter most:
- The test is dollars, not transactions. Tax Commission guidance has no transaction-count test. You will see third-party articles that describe a 200-transaction trigger. Do not rely on that for Idaho. Track your Idaho sales dollars instead.
- The test looks at two calendar years. Because the rule refers to the current or previous calendar year, a seller whose Idaho sales passed $100,000 in one year should expect the obligation to carry into the next. Confirm with the Tax Commission exactly when collection must begin after you cross the line.
- Crossing the line creates an obligation, not a grace period. Register for a seller's permit before you collect, and make sure your checkout is charging the 6% rate on Idaho orders.
Pull your Idaho sales report from your ecommerce platform each quarter. Sales to Idaho shipping addresses are what count, so make sure your reports separate them from total sales.
Click-through nexus: referral partners
Idaho also has click-through nexus. It applies when all three of these conditions are true:
- You have no physical presence in Idaho.
- You have an agreement with an Idaho retailer to refer customers to you.
- Your sales to Idaho customers exceed $10,000 in the preceding 12 months.
Note that the $10,000 figure is far lower than the $100,000 economic nexus threshold. If you run a referral or affiliate arrangement with an Idaho retailer, add up your Idaho customer sales from those referrals each month. If you pass $10,000 in a rolling 12-month period, review your position with the Tax Commission or a tax professional before the next filing deadline.
Marketplace facilitators
A marketplace facilitator is the platform that lists products, processes payment and often collects sales tax for third-party sellers. Idaho treats these platforms separately from the individual sellers who use them.
- The facilitator's own threshold. A marketplace facilitator with no Idaho presence must collect once its own Idaho sales plus the Idaho sales of third-party sellers on its platform exceed $100,000. Facilitators in that position need separate permits for each.
- Sellers who use a collecting facilitator. If you sell only through registered marketplace facilitators that collect Idaho tax, you generally need no Idaho seller's permit for those sales. You should still check that the facilitator's reports include your Idaho sales, so your records match what was collected and remitted.
- Sellers who also sell direct. Track your direct sales from your own website or storefront separately from marketplace sales, and confirm with the Tax Commission how marketplace sales count toward your own $100,000 test.
Marketplace rules can be the easiest part of Idaho sales tax to get wrong, because the platform's collection can make you feel covered when your own direct sales have quietly crossed a threshold. Keep the two sets of numbers separate.
Which rule applies to you
| Your situation | What applies |
|---|---|
| Inventory, office, or reps in Idaho | Physical presence. Collect from the first Idaho sale and register for a seller's permit. |
| No Idaho presence, direct sales over $100,000 in the current or previous calendar year | Economic nexus. Collect 6% on Idaho orders and register. |
| No Idaho presence, Idaho retailer referrals over $10,000 in 12 months | Click-through nexus. Review with the Tax Commission or a tax professional. |
| Sell only through a facilitator that collects Idaho tax | No seller's permit needed for those sales. Confirm the facilitator reports your Idaho sales. |
| No Idaho presence, direct Idaho sales under the thresholds | No collection obligation at this time. Keep tracking Idaho dollars each year. |
Collecting on shipments
Idaho sellers collect the 6% state rate on Idaho deliveries. For shipments to customers outside Idaho, you follow the destination state's sales tax rules, not Idaho's. This is where many sellers end up with a second nexus question. Once your sales to another state cross that state's threshold, you may have a collection obligation there too. Idaho nexus does not answer that question for you.
How to register
Register for a regular seller's permit through IBR, the Tax Commission's online registration system, at tax.idaho.gov/ibr. The Tax Commission's main site is tax.idaho.gov. Applying for a seller's permit is free. Confirm your filing frequency on the Tax Commission's pages before you register.
If you have not formed your business entity yet, or you plan to sell under a trade name, handle that first. The Idaho Secretary of State handles both:
- LLC certificate of organization: $100 when filed online through SOSBiz, or $120 on paper. File at sosbiz.idaho.gov/forms/business/.
- Annual report: Required every year for LLCs and corporations. The fee is listed as no fee in Idaho Code 30-21-214, so the obligation is the filing itself.
- Assumed business name (DBA): Filed with the Idaho Secretary of State, not the county. It costs $25 filed online or $45 on paper, and it stays active until canceled. Forms are at sos.idaho.gov/business-forms/.
Idaho does not issue a state general business license. Registering an entity is a registration, not a license. Counties do not issue a general business license either. Some cities require a general license or permit, and others license only specific activities, so check with your city clerk before you assume you are covered. The Business Wizard at business.idaho.gov generates a checklist of the agencies and permits a specific activity needs.
Past exposure: the voluntary disclosure program
If you realize you have been over a threshold for a while without collecting, Idaho has a voluntary disclosure program that covers past exposure. Eligibility rules, what the program covers and how it is applied for are set by the Tax Commission, so confirm those details directly with the agency. Get professional advice before you contact the state about past periods, because what you disclose and how you describe it can matter.
A practical checklist
- Confirm whether you have a physical presence in Idaho, including inventory at any Idaho fulfillment center or any person taking orders in the state.
- Pull your Idaho sales dollars for the current and previous calendar year, separating direct sales from marketplace sales.
- List any Idaho retailer referral agreements and total the 12-month Idaho sales those referrals produced.
- Check each marketplace facilitator's reports to confirm it collects Idaho tax on your sales.
- If any test is met or close, register through IBR at tax.idaho.gov/ibr and confirm when collection must begin.
- Check your city clerk's requirements for any general license or permit, and check any activity-specific license with the state board or agency that covers it.
- Set a recurring calendar reminder to recheck your Idaho sales dollars each year.
Where to verify
- Idaho State Tax Commission: tax.idaho.gov
- Idaho Secretary of State: sos.idaho.gov
- SOSBiz business search: sosbiz.idaho.gov/search/business
- Business.Idaho.gov: business.idaho.gov
- Idaho Small Business Development Center: idahosbdc.org
When to bring in a professional
A single-state seller with clean records and no referral agreements can often handle registration on their own. Bring in a CPA or tax attorney if any of these apply: you have crossed or are near a threshold in more than one state, you have inventory held by third parties across state lines, you have referral agreements with Idaho retailers, or you think you owe tax for past periods. A few hours of professional review costs far less than an unexpected assessment for several years of uncollected tax.