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LLC 101 Guide

Course unit 3 · Idaho

Foreign LLC Registration in Idaho (2026): 5 Tasks and the 3 Best Services

Idaho Registered Agent.co ($199), Mainstay Filing ($199) and ID Registered Agent.org ($199): that is the order of the services we would hire in Idaho in 2026 for registering an out-of-state LLC. 5 tasks cover the filing, the $100 fee and what you owe afterward.

Prepared by the LLC 101 Guide instructors

The quick version

What the state charges to register
$100
Taken from legislature.idaho.gov in October 2026
Home certificate
90 days
Must be issued within
Annual report
None
Annual report
Three years of state fees
$100
State charges only
How many tasks
5
In order

Unit goals

  • When an LLC from elsewhere must register in Idaho
  • The form and the fee
  • What comes after registration
  • The services at the top of the class

If you want someone else to file

What counts most: three-year cost and how many assignments the price finishes. How we grade lists all five criteria.

Top of the class

1. Idaho Registered Agent.co: best for an inexpensive Idaho filing

Best overall$199 and the $100 state fee, then $99 yearly

In Idaho, Idaho Registered Agent.co leads the class: $199 above the state fee, first agent year covered, then $99 a year.

Three years cost less here than at Mainstay Filing, and three-year cost is 34% of the grade.

What the price covers

  • Filing made with the state
  • One year of agent service is part of the price

What works

  • The agent renews at $99
  • $199 and the state fee
  • A free first agent year

What to weigh

  • A single-state service
Visit Idaho Registered Agent.coPartner link. We may earn money if you buy.

Top of the class

2. Mainstay Filing: best for one provider for home and away

Any state$199 and the $100 state fee, then $149 yearly

Second goes to Mainstay Filing, since it files the Idaho registration for $199 plus the state's fee, and the first agent year costs nothing.

Counted over three years, it trails Idaho Registered Agent.co by $100.

Agent service after the first year is $149 a year.

What the price covers

  • Filing made with the state
  • The registered agent costs nothing in year one
  • Any state, one price

What works

  • The same fee in every state
  • $199 on top of Idaho's fee
  • Registered agent is free in year one

What to weigh

  • Idaho Registered Agent.co charges $50 less for the agent
Visit Mainstay FilingPartner link. We may earn money if you buy.

Top of the class

3. ID Registered Agent.org: best for a small agent renewal

In-state service$199 and the $100 state fee, then $99 yearly

ID Registered Agent.org takes third place: $199 above the state fee, first agent year covered, then $99 a year.

It lists the same prices as Idaho Registered Agent.co.

What the price covers

  • Filing made with the state
  • One year of agent service is part of the price

What works

  • A free first agent year
  • The agent renews at $99
  • $199 and the state fee

What to weigh

  • A single-state service
Visit ID Registered Agent.orgPartner link. We may earn money if you buy.

The Idaho picks compared

#ServiceFirst yearFrom year twoThree-year total
1Idaho Registered Agent.co$199$99/yr$397Visit Idaho Registered Agent.coPartner link. We may earn money if you buy.
2Mainstay Filing$199$149/yr$497Visit Mainstay FilingPartner link. We may earn money if you buy.
3ID Registered Agent.org$199$99/yr$397Visit ID Registered Agent.orgPartner link. We may earn money if you buy.
Taken from each company's price page on November 13, 2026. Every row also owes the $100 state fee.

The tasks

  1. Task 1

    Is Idaho registration needed?

    LLCs formed outside Idaho file a foreign registration to transact business here. Skipping registration has a price: Until it registers, the LLC cannot bring a lawsuit in Idaho courts (Idaho Code 30-21-502(b)). Signed contracts keep their force (Idaho Code 30-21-502(c)).

    Source: Taken from archive.sos.idaho.gov in October 2026

  2. Task 2

    Get a certificate from your home state

    Your filing must include certificate of existence (certificate of good standing) from the home state, issued no more than 90 days.

    Save this task for just before you file.

  3. Task 3

    Appoint the 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.

    Our recommendations cover this role.

    Source: Taken from legislature.idaho.gov in October 2026

  4. Task 4

    Put together the Foreign Registration Statement

    Fill in the Foreign Registration Statement, include $100, and mail or upload it to the Idaho Secretary of State, Business Services.

    Source: Taken from legislature.idaho.gov in October 2026

  5. Task 5

    What comes after

    Next on the list is the annual report, before the end of the month in which the LLC registered.

Idaho costs by task

EntryWho gets paidPrice
Filing to registerGoes to the state$100
Service fees (optional)Your service$199 at the start
State fees for the first three yearsGoes to the state$100
The state numbers are official Idaho fees, sourced below. The three-year line combines the filing fee, the reports in years two and three and any minimum tax.

The reasoning behind the order

pulled ahead of on course fee across three years, a criterion worth 34%.

Idaho Registered Agent.co costs $397 for years one to three, while Mainstay Filing costs $100 more.

Short answers

How much does Idaho charge an out-of-state LLC to register?

$100 to the state. Service fees: $199.

Which form do I file to register?

Look for the Foreign Registration Statement; the Idaho Secretary of State, Business Services takes it.

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?

Until it registers, the LLC cannot bring a lawsuit in Idaho courts (Idaho Code 30-21-502(b)). Signed contracts keep their force (Idaho Code 30-21-502(c)).

What is due after registering?

The annual report keeps the registration active.

Which service should handle the registration?

Idaho Registered Agent.co, because the Idaho registration is filed for $199 and includes a year of agent service, with renewal at $99. After it come Mainstay Filing and ID Registered Agent.org.

Reading list and sources

  1. Everything about Idaho yearly filing: Annual report: due date, official above traces to legislature.idaho.gov, a page we reread in October 2026.
  2. Everything about Idaho Code § 30-25-201 above traces to legislature.idaho.gov, a page we reread in August 2026.
  3. Everything about Idaho formation fee: Filing fee, official source above traces to sos.idaho.gov, a page we reread in October 2026.
  4. Everything about Idaho formation fee: Filing fee, official source above traces to legislature.idaho.gov, a page we reread in October 2026.
  5. Everything about Idaho registered agent statute above traces to legislature.idaho.gov, a page we reread in October 2026.
  6. Everything about Idaho Secretary of State, Foreign Registration Statement above traces to archive.sos.idaho.gov, a page we reread in October 2026.
  7. Everything about Idaho Secretary of State, business FAQ above traces to sos.idaho.gov, a page we reread in October 2026.
  8. Everything about Idaho Code 30-21-505, activities that are not doing above traces to legislature.idaho.gov, a page we reread in October 2026.
  9. Everything about Idaho Code 30-21-213, annual report above traces to legislature.idaho.gov, a page we reread in October 2026.
  10. Everything about Withdrawal of Foreign Registration Statement above traces to archive.sos.idaho.gov, a page we reread in October 2026.
  11. Everything about Idaho Code 30-21-502, registration to do business above traces to legislature.idaho.gov, a page we reread in November 2026.
  12. pricing page of Idaho Registered Agent.co, taken on November 13, 2026
  13. Idaho service page of Mainstay Filing, taken on November 13, 2026
  14. pricing page of ID Registered Agent.org, taken on November 13, 2026