Form a Business in Idaho
Filing fees, deadlines, registered agent rules, and tax structure for Idaho, verified against the Idaho Secretary of State Phil McGrane, Business Services Division on Jun 11, 2026.
Idaho at a glance
What makes Idaho different
- Idaho LLC ANNUAL REPORT IS FREE ($0) ONLINE through SOSBiz. One of ~6 US states with free AR.
- Paper AR adds $20 manual processing fee (in-person Boise office only).
- AR due last day of anniversary MONTH (calendar month of formation).
- LLC formation $100 online / $120 paper (paper adds $20 manual fee).
- PERSONAL & CORP INCOME TAX FLAT at 5.3% in 2026 (reduced from 5.8% via HB 40 of 2025). Personal + Corp at same rate (like UT).
- Sales Tax 6% state + local up to 3% = combined 6-9%
- Series LLC PERMITTED under Idaho Code § 30-25-1101 (Uniform Protected Series Act).
- No publication requirement.
Idaho tax structure
no state personal income tax, no corporate income tax, sales tax 6.0%.
For detailed tax planning, see the Idaho Secretary of State Phil McGrane, Business Services Division and the Idaho Department of Revenue. File.Business is not a tax preparer, consult a CPA for personalized advice.
Ready to file in Idaho?
We handle Articles of Organization, registered agent service, annual report monitoring, and ongoing compliance, backed by our canonical Idaho ruleset (re-verified quarterly against Idaho Secretary of State Phil McGrane, Business Services Division).
Filing portal: https://sosbiz.idaho.gov/
Common questions.
What is the first step to start a business in Idaho?
The first real decision is your entity type, because it drives everything after: taxes, liability, and paperwork. For most small businesses in Idaho that means forming an LLC, which you do by filing a formation document with the state and naming a registered agent. Get the structure right first, then EIN, banking, and licenses follow in order. We walk you through the Idaho sequence so nothing is done out of turn.
Which business structure should I choose in Idaho?
Most Idaho founders land on an LLC for its liability protection and simple pass-through taxes, but a corporation makes sense if you plan to raise venture capital or issue stock. A sole proprietorship is simplest but leaves your personal assets exposed. The honest answer depends on your goals, so we lay out the LLC-versus-corporation trade-offs for Idaho rather than pushing one.
Do I need a registered agent in Idaho?
Yes. Idaho requires every LLC and corporation to name a registered agent with a physical in-state address to receive legal and state notices. You can be your own, but then your address is public and you must be available during business hours. Most owners use a service to stay private and never miss a notice. We include agent service so this box is checked from day one.
How much does it cost to start an LLC in Idaho?
The cost is the Idaho state filing fee plus any service you use, and Idaho also charges recurring fees such as an annual or biennial report. Our formation service itself is free, and we pass state fees through at cost with no markup. Because state figures change over time, current Idaho amounts are on the pricing page rather than quoted here where they could go stale.
What taxes will my Idaho business pay?
It depends on your structure and activity, but expect some mix of federal income and self-employment tax, Idaho state taxes where they apply, and sales tax if you sell taxable goods. Some states have no income tax while others add franchise or gross-receipts taxes. Once profits grow, an S-corp election can reduce self-employment tax. We flag which Idaho taxes actually apply to you rather than listing every possibility.
Do I need an EIN for my Idaho business?
Almost certainly. You need an EIN to open a business bank account, hire employees, or file most business taxes, and it keeps your Social Security number off company paperwork. It is free from the IRS, and our value is getting it right and fast, including for founders without an SSN. We obtain it as part of setting up your Idaho entity so banking is not held up.
What are the ongoing compliance requirements in Idaho?
After formation, Idaho expects you to keep a registered agent, file the periodic annual or biennial report, pay any state fees, and renew licenses on schedule. Miss these and the state can revoke your good standing or dissolve the entity. We track your Idaho deadlines in a compliance calendar and can file the reports for you so nothing lapses while you run the business.