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Idaho Economic Nexus: The $100,000 Sales Tax Rule Explained

November 12, 2026
Idaho Economic Nexus: The $100,000 Sales Tax Rule Explained

Idaho gives you economic nexus for sales tax when your Idaho sales pass $100,000 in the current or previous calendar year, even if you have no office, warehouse or employee in the state. Idaho's online seller rules have applied that threshold since June 1, 2019. Once you cross it, you register, collect 6% sales tax on taxable sales and file returns with the Idaho State Tax Commission. This guide covers how the threshold is counted, what you do after crossing it, and how sales tax nexus differs from the income tax questions multi-state owners face.

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TL;DR

  • Economic nexus in Idaho means more than $100,000 in Idaho sales in the current or previous calendar year, with no physical presence required.
  • Physical presence (an office, warehouse, stock of goods or a sales representative visiting Idaho) creates nexus on its own, at any sales level.
  • After nexus, you need a seller's permit, collect the 6% state tax on taxable sales, file through TAP and keep records for at least four years.
  • Sales tax nexus is separate from income tax nexus. A business can have one without the other, so check each on its own.
  • Owners with several entities should map nexus entity by entity, because each one carries its own filing duties.

Table of Contents

What nexus means for an Idaho seller

Nexus is the connection between a business and a state that gives the state the right to require tax collection or tax filing. For sales tax, there are two ways to create it in Idaho.

Physical presence. The Tax Commission says that if you make sales in Idaho, physical presence requires you to collect sales tax. Examples include an office, warehouse, sales or sample room, or storage place, a stock of goods, or a representative who comes to Idaho to sell, deliver, install or take orders.

Economic presence. Idaho passed its law in response to the U.S. Supreme Court's Wayfair decision, as the Online Sellers Guide explains. Under it, a retailer with no physical presence must still collect when Idaho sales exceed the threshold.

The practical point: you can be a Utah, Oregon or Washington seller with no Idaho footprint and still owe Idaho sales tax. Many Treasure Valley businesses see the reverse too. A Boise company shipping to customers elsewhere may have the same issue in other states.

The $100,000 threshold, step by step

Idaho's threshold is sales in Idaho exceeding $100,000 in the current or previous calendar year, per the Tax Commission's definitions. A state-by-state chart reflecting August 1, 2026 describes it as $100,000 in gross sales, with marketplace sales counting toward an individual seller's total.

Three details matter in practice:

  1. It is a rolling test. You are measured against the current calendar year and the previous one. If last year's Idaho sales were $104,000, you have nexus this year from January 1, even if this year starts slowly.
  2. It counts sales into Idaho. Total company revenue is the wrong number. Use sales delivered to or used by customers in Idaho.
  3. There is no transaction-count test. The measure is dollars of sales.

A worked example

Say you run a small online shop that sells candles, and your Idaho sales look like this:

YearIdaho salesNexus status
Year 1$62,000No economic nexus
Year 2, through September$100,400Threshold exceeded in the current year
Year 3, all yearAny amountPrevious year exceeded $100,000, so nexus applies from January 1

In year 2 you must register and begin collecting once you pass $100,000. In year 3 you are already in scope on day one. That is why tracking Idaho sales monthly beats checking once a year.

Marketplace sellers and facilitators

If you sell through a large online platform, the platform may handle the tax. The Tax Commission states that sellers who only sell on third-party websites or social media sites that register as marketplace facilitators don't need an Idaho seller's permit. Those platforms report the sales, collect the tax and forward it.

If you also sell from your own website, the picture changes. Your direct sales still count, and marketplace sales count toward your threshold. Keep sales by channel in separate columns in your books so you can see both numbers.

Marketplace facilitators have their own test. Without a physical presence, they must collect when the combined total of their own sales and third-party sales in Idaho exceeds $100,000 in the current or previous year, and they need separate seller's permits for their own sales and third-party sales.

Marketplace sellers and facilitators

Who needs a seller's permit

The Tax Commission lists the permit triggers. Out-of-state retailers with Idaho sales of more than $100,000 in any 12-month period, or more than $10,000 in any 12-month period through a retail referral agreement, need an Idaho seller's permit. Note the wording here is a 12-month period, so confirm the measuring window on the permit page when you register.

The small seller exemption

Idaho added relief for tiny sellers. As of July 1, 2025, qualifying Idaho residents operating as individuals or sole proprietors whose cumulative gross sales don't exceed $5,000 in the current or previous calendar year don't have to get a permit or collect sales tax. They still pay sales tax on what they buy, should track sales if they make more than $3,000 a year, and must report income on their income tax returns.

The exemption has limits:

  • It does not cover motor vehicles, trailers, all-terrain and utility-type vehicles, specialty off-highway vehicles, lodging, off-road motorcycles, snowmobiles, aircraft, vessels, alcohol or tobacco products, or admissions and entertainment, per the Small Seller Exemption page.
  • A seller who passes $5,000 must start collecting immediately, not retroactively on the first $5,000. They must apply for a temporary or regular seller's permit within 30 days and begin sending in tax once the permit arrives, according to the same page.

Side income is often how owners first meet these rules. A side hustle tax guide for beginners is a good companion if you are just starting to sell on the side.

What is taxable in Idaho

Nexus only matters for sales that are taxable. Idaho sales tax applies to every retail sale unless an exemption applies. The Tax Commission's basics guide gives these examples:

  • Tangible personal property
  • Digital books, videos, music or games with a permanent right to use
  • Short-term rental accommodations of 30 days or less
  • Meals or drinks
  • Event admissions
  • Recreational use of personal property or facilities
  • Production, fabrication, printing or imprinting labor

Two points surprise sellers from other states. First, groceries are taxed at the full state rate with no reduced rate for food. Second, one industry summary notes that remotely accessed cloud software (SaaS) is exempt from Idaho sales tax, while digital products with a permanent right to use are taxable and leases of those products are not. Confirm the treatment of your specific product with the Tax Commission before you rely on an exemption.

Rates: 6% state tax and local resort taxes

Idaho's sales tax rate is 6%, and the use tax rate is also 6%. Remote sellers get a simplification: a retailer without physical presence that meets the $100,000 threshold shall not collect or remit local sales tax or any other tax not imposed by Idaho's sales tax chapter, under Idaho Code 63-3611(h).

If you do have a physical presence, local rules can matter. Some resort cities add voter-approved local option taxes, which can add up to 3% on top of the 6% state rate, bringing combined rates as high as 9%. For example, one city summary shows McCall applying 1% on most retail sales and 8% on lodging. Idaho is a destination-based state, so the rate follows where the customer receives the product, and all returns go to the State Tax Commission with no separate local filings, as the same TaxCloud summary notes.

Idaho state and local sales tax rates

After you have nexus: register, file, keep records

Register

Apply for a seller's permit with the Tax Commission before you start collecting. Idaho's business registration system is described as allowing simultaneous registration with the State Tax Commission, Department of Labor and Industrial Commission. Confirm the current process and processing times on the Tax Commission's own site.

File and pay

Sellers with a regular permit file online through TAP on their assigned schedule: monthly, quarterly, semiannual or annual. Most retailers file monthly, with tax due by the 20th of the following month, and retailers owing less than $750 in tax per quarter pay quarterly. Sales tax is due on the accrual method, a return is required even if you had no sales, and the minimum late filing penalty is $10. All of this is on the Tax Commission's filing and paying page.

Keep records

Retailers must keep sales and use tax records for at least four years, and may need seven if they don't file returns. Resale or exemption certificates stay on file as long as you do business with the buyer, plus four years, per the Retailers Basics Guide. The same guide says to keep records showing gross receipts from Idaho sales, even those you treat as exempt, because the Commission can bill you for tax if you can't show why a sale wasn't taxed. The Commission's administrative rules add that records must be kept until final resolution if an assessment is under appeal.

A simple monthly routine:

  1. Export Idaho sales by channel and by taxable or exempt status.
  2. Compare the rolling total with $100,000.
  3. Store exemption certificates in one folder by customer.
  4. File on your assigned schedule, even at zero.

Sales tax nexus is not income tax nexus

Owners often merge the two ideas. They are separate tests with separate consequences.

Sales tax nexusIncome tax nexus
What it coversCollecting tax from customersReporting and paying tax on business income
Trigger in IdahoPhysical presence or more than $100,000 in Idaho salesDoing business or earning income from Idaho sources
Who paysThe customer, collected by youThe entity or its owners
Filed withIdaho State Tax Commission through TAPIdaho State Tax Commission on income tax returns

The income tax column is a general summary. The rules for your situation depend on your entity type and where owners live, so it is worth an expert look.

This matters most for multi-entity operators. A holding company, an operating S corporation and a real estate LLC can each have different sales tax exposure and different income tax filing positions. Remote workers can add another layer: our guide to remote employee state taxes covers how where your people work can change your state filings. If you are relocating, moving from Oregon to Idaho changes your personal filing picture too.

Our perspective

Sales tax nexus is a compliance duty, and most owners treat it as an afterthought until a letter arrives. We see it differently. The moment you cross $100,000 in Idaho sales is a signal that your business has grown into a new stage, and your structure should be reviewed with it.

For owners netting $300,000 to $1,000,000, the questions stack up fast. Which entity makes the sales? Which one holds the inventory? Where do owners draw pay? An S corporation set up well can change what you keep. Our Idaho S corporation checklist walks through the scenarios we see most.

We built our approach around year-round planning rather than a once-a-year filing, so that a growth milestone like nexus triggers a conversation, not a scramble. Strategy that pays you back starts when you plan before the number is crossed.

Melissa

Work with The Tax Refinery

If your business has outgrown simple filing, we pair strategy with preparation. Our Monthly Tax Advisory is $11,997 per year, and our Quarterly Tax Strategy Sessions are $9,497 per year. Both are built for owners who want year-round planning around entity structure, growth and multi-state questions.

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If an S corporation is on your list, the S-Corp Tax Strategy Accelerator is $997. For return preparation, our fee schedule lists form-based pricing, including $1,800 for Form 1120-S and Form 1065 and $495 for self-employed individual returns. You can also start from our home page to see all our services.

FAQ

What is the Idaho economic nexus threshold?

It is more than $100,000 in Idaho sales in the current or previous calendar year. The rule has applied since June 1, 2019, to retailers with no physical presence in the state. Marketplace sales count toward an individual seller's total.

Do I need a seller's permit if I only sell on a marketplace?

Not if the marketplace is registered with the Tax Commission as a facilitator. It reports the sales, collects the Idaho tax and forwards it. If you also sell on your own site, those direct sales may still require a permit once you meet the thresholds.

Do I have to collect local sales tax as a remote seller?

No. A retailer without physical presence in Idaho that meets the $100,000 threshold does not collect or remit local sales tax under Idaho Code 63-3611(h). You collect the 6% state rate. Sellers with a physical presence in a resort city should check local option taxes.

How long do I keep sales tax records?

At least four years. You may need to keep them seven years if you did not file returns, and resale or exemption certificates stay for as long as you sell to that buyer plus four years.

Does sales tax nexus create an income tax filing duty?

Not automatically. Sales tax and income tax use different tests, so a business can have one without the other. Review both, especially if you run more than one entity.

Sources