Idaho LLC Taxes Explained: 5.3% Income Tax, Pass-Through Treatment and No Franchise Tax
Idaho LLC Taxes Explained: 5.3% Income Tax, Pass-Through Treatment and No Franchise Tax
If you are forming a single-member LLC in Idaho, the state tax picture is simpler than in most states. Idaho has no franchise tax on LLCs and no LLC-specific annual state tax. A default Idaho LLC is a pass-through entity: its profit flows to the members, and each member reports their share on a personal Idaho return at the flat 5.3% rate.
The complications come from the choices that change that default, including an S corporation or C corporation election, and from the few state payments that still apply to those choices. This guide walks through each one, shows where the figures come from, and flags the numbers you should confirm before you file.
Informational content only. This article is not legal, tax or accounting advice. Tax treatment depends on your facts. Before you make an S corporation or C corporation election, or set up a complex ownership structure, talk with a qualified CPA or attorney. Confirm current rates with the Idaho State Tax Commission at tax.idaho.gov.
Start with the formation costs and registrations
Your first state payment is the formation filing. The Certificate of Organization (Limited Liability Company) costs $100 when you file online through SOSBiz at sosbiz.idaho.gov, and $120 on paper. Under Idaho Code 30-21-302(d), the name must include 'limited liability company,' 'limited company,' or an abbreviation such as LLC or L.C. It must also be distinguishable from names already on the Secretary of State's records. Search the business records at sosbiz.idaho.gov/search/business before you file.
Every Idaho LLC also needs a registered agent with a physical Idaho street address. P.O. boxes are not accepted. An owner may act as their own registered agent if they have an Idaho address, but an assumed business name cannot serve as the agent.
Idaho does not have a state business license. Registering the LLC is a registration, not a license, and that distinction matters for everything else in this guide.
The annual report is required every year. Your first one is due beginning one year after formation, before the end of the month in which the Certificate of Organization became effective. The state lists the fee as no fee, but a report you forget is still a compliance miss, so put it on your calendar the day you form the LLC.
If you operate under another name, file a Certificate of Assumed Business Name with the Secretary of State, not the county. It costs $25 online or $45 on paper, which includes a $20 manual data entry surcharge. The assumed business name stays active until you cancel it and is not renewed.
How a default Idaho LLC is taxed
By default, an Idaho LLC does not pay income tax as a separate entity. Income passes through to the members, who report their shares on their personal Idaho returns. Single-member LLCs are the most common case: the owner reports the LLC's profit or loss on a personal return, and that net amount is what the state taxes.
The flat 5.3% individual rate
Idaho's individual income tax is a flat 5.3% on taxable income above a threshold. Idaho Code 63-3024 sets that threshold at $2,500 for single filers and $5,000 for joint filers in its base text, and the Tax Commission indexes it each year. Secondary sources put the 2025 figures at about $4,811 for single filers and $9,622 for married couples filing jointly. Check the Form 40 instructions for your tax year at tax.idaho.gov before you rely on either number.
Here is how the 2025 single figure works. If your Idaho taxable income is $60,000, the first $4,811 carries no Idaho tax, and the remaining $55,189 is taxed at 5.3%. That is about $2,925 of tax before credits. Your actual taxable income depends on federal adjustments and deductions, so treat this only as a sense check.
What a single-member owner reports
- The LLC's net profit or loss, reported on your personal federal and Idaho returns in the way your CPA sets up the filing.
- Idaho tax at 5.3% on taxable income above the threshold, added to any other Idaho income you have.
- Generally, no separate Idaho entity return under the default treatment. The $10 permanent building fund tax covered below applies to partnerships and S corporations, so it does not apply to a default single-member LLC.
Entity-level taxes: when the LLC itself pays
Some Idaho payments depend on how the LLC is classified for federal tax purposes. The table shows where each common classification lands.
| LLC tax classification | Who reports the income | Entity-level Idaho payments |
|---|---|---|
| Single-member default | Owner, on a personal return at 5.3% | None under the default treatment |
| Multi-member default (partnership) | Members, on personal returns at 5.3% | $10 permanent building fund tax per owner for whom the entity pays Idaho tax |
| S corporation election | Shareholders, on personal returns at 5.3% | $10 building fund tax per owner, franchise tax under 63-3025A with a $20 minimum for returns filed, and an optional yearly ABE election |
| C corporation election | The LLC, at the 5.3% business income tax rate | 5.3% business income tax plus the $10 building fund tax |
The $10 permanent building fund tax
A partnership or S corporation, including an LLC taxed that way, pays a $10 permanent building fund tax per owner for whom the entity pays Idaho tax. That count is not necessarily every member. If your LLC has more than one owner, confirm the count with the Tax Commission or your CPA before you budget for it.
The ABE election
Idaho Code 63-3026B lets a partnership or S corporation make an affected business entity (ABE) election, so the entity pays the tax at the entity level rather than passing it through to the members. The election is made each year, not once. Whether it saves money depends on your members' residency and tax positions, so model both paths with a CPA before you choose.
C corporation treatment
An LLC taxed as a C corporation pays Idaho's 5.3% business income tax plus the $10 permanent building fund tax. The corporate rate dropped to 5.3% for tax year 2025 under HB 40, down from 5.695% in 2024. A C corporation's profit is taxed inside the company, and owners who take distributions may be taxed again on them personally. Many single-member owners keep the default treatment for that reason, but the right answer depends on your numbers.
The franchise tax under 63-3025A
The title's 'no franchise tax' applies to LLCs. Corporations are different. Idaho Code 63-3025A sets a franchise tax measured by income for corporations, and it also applies to S corporations that file returns, with a $20 minimum. Include it in your budget if you choose either election, and confirm the current minimum and filing requirements with the Tax Commission.
Sales tax and other taxes that are not income tax
Idaho's state sales tax is 6%. Outside voter-approved resort cities, Idaho has no local sales tax, so most businesses charge only the state rate. An LLC that sells taxable goods or services must register through Idaho Business Registration at https://tax.idaho.gov/ibr to collect and remit it.
Sales tax is separate from income tax, and personal property tax is separate from both. Plan for each on its own schedule and confirm the rules that apply in your county.
If you plan to offer short-term rentals, note that since July 1, 2026, HB 583 bars cities and counties from requiring a license, fee, permit or registration for a short-term rental. State and local lodging taxes still apply, so confirm your obligations with the Tax Commission and your city or county.
Licenses are local, not state taxes
Idaho handles most licensing at the city level and through profession-specific state boards. Counties do not issue a general business license. Some cities require a general license or permit, while others license only specific activities. Check your own city's rules with the City Clerk, because neither answer applies everywhere.
The Business Wizard at business.idaho.gov produces a checklist of the agencies and permits your activity needs. Contractors are the main profession-specific case to know about. Idaho has no statewide general contractor license, but contractors register with the Idaho Contractors Board at the Division of Occupational and Professional Licenses (DOPL).
Common mistakes that cost Idaho LLC owners money
- Treating registration as a license. The Certificate of Organization registers your LLC. It does not license your activity.
- Filing an assumed business name with the county. The Idaho DBA is filed with the Secretary of State.
- Skipping the annual report. It is required every year, and it is easy to miss in the first year.
- Assuming 'no franchise tax' covers every entity. Corporations and S corporations face the 63-3025A franchise tax.
- Choosing ABE or S corporation treatment without modeling it. These choices change who pays, when, and how much.
- Forgetting the per-owner building fund tax. Partnerships and S corporations owe it, and the count is per owner for whom the entity pays Idaho tax.
- Assuming a short-term rental needs a city permit. Since July 1, 2026, cities and counties may not require one, but lodging taxes still apply.
Checklist for a single-member Idaho LLC
- File the Certificate of Organization with the Secretary of State: $100 online or $120 on paper.
- Name a registered agent with a physical Idaho street address.
- Get a federal employer identification number from the IRS and confirm your federal tax classification with your CPA.
- Decide whether you need any Idaho election, such as S corporation or ABE treatment, and document the decision.
- Register for a sales tax permit if you sell taxable goods or services.
- Check city and profession-specific licensing before you open.
- File the annual report every year, beginning one year after formation.
- Set aside money for your Idaho income tax on LLC profit, and ask your CPA about estimated payments.
Where to confirm the numbers
- Idaho Secretary of State: sos.idaho.gov, with filings made through SOSBiz
- Idaho State Tax Commission: tax.idaho.gov, including sales tax registration through Idaho Business Registration
- Business.Idaho.gov: business.idaho.gov
- Idaho Small Business Development Center: idahosbdc.org
- SBA Boise District Office: sba.gov/district/boise
Start with the default, confirm the income tax threshold and any franchise tax for your tax year, and bring your formation documents to a CPA before you make any election. Idaho's rules are straightforward on paper. The classification decision you make is what changes the bill.