How to Register a Foreign LLC in Idaho (2026): 5 Steps and the 3 Best Services
The short answer for registering a foreign LLC in Idaho this year (2026): Mainstay Filing ($199), Idaho Registered Agent.co ($199) and ID Registered Agent.org ($199), in that order. The 5 steps below start with whether you need to register at all. State fee: $100.
Each company's listed price on November 12, 2026. Add Idaho's $100 registration fee to each row.
The steps
Step1
Step 1: See if your LLC must register in Idaho
A foreign LLC is one formed in another state. Before it transacts business in Idaho, it registers there. Operating without it: An unregistered LLC cannot bring a suit there (Idaho Code 30-21-502(b)). Contracts it already signed stay valid (Idaho Code 30-21-502(c)).
Attach certificate of existence (certificate of good standing) from the home state, at most 90 days.
TipDo this step just before filing.
Step3
Step 3: Line up an Idaho registered agent
Every LLC must name a registered agent with an in-state street address. The address has to be a physical street address in Idaho. P.O. boxes and commercial mailboxes are not accepted.
The recurring filing is the annual report, before the end of the month in which the LLC registered.
Idaho costs by step
Step
Paid to
Amount
Registering the LLC
Paid to the state
$100
Service fees (optional)
Your service
$199 up front
Three years of state fees
Paid to the state
$100
For the three-year state total we add the filing fee, the reports in years two and three and any minimum yearly tax.
Why this order
What decided it: lesson steps handled, 35% of our rubric.
A foreign LLC already lives in another state, so one provider for both states graded best.
Quick answers
What does it cost to register a foreign LLC in Idaho?
$100 for the filing. A service adds $199.
Which form do I file to register?
Send the Foreign Registration Statement to the Idaho Secretary of State, Business Services.
Do I need a certificate from my home state?
Yes: certificate of existence (certificate of good standing) from the home state, issued within 90 days of filing.
What if the LLC does business there without registering?
An unregistered LLC cannot bring a suit there (Idaho Code 30-21-502(b)). Contracts it already signed stay valid (Idaho Code 30-21-502(c)).
What is due after registering?
Keep the registration alive with the annual report.
Which service should handle the registration?
Mainstay Filing: registration for $199 plus state fees and a free first year as a registered agent. After it, Idaho Registered Agent.co and ID Registered Agent.org.