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Quick answer · Idaho

3 Best Foreign Registration Services in Idaho (2026): The Quick Answer

Best foreign registration services in Idaho for 2026: Mainstay Filing ($199), ID Registered Agent.org ($199) and Idaho Registered Agent.co ($199), ranked in that order. Registering costs $100 at Idaho, whoever files, plus $397 to $497 to a service over three years.

LLC Q and A editorial team ·

At a glance

Fee to the state
$100
Home-state certificate?
Yes (90 days max age)
After registering
None, annual report
Pick
Mainstay Filing, ID Registered Agent.org then Idaho Registered Agent.co

Idaho: ranked picks

Prices come from each company's own page. See the method.
1#1 pick

1. Mainstay Filing: best for a growing LLC

Register for $199; agent renews at $149

#1 in Idaho: Mainstay Filing, because $199 in every state, with the first registered agent year included.

The $100 premium over ID Registered Agent.org across three years buys coverage outside Idaho.

Registered agent: free in year one, $149 a year after, in any state.

Price covers

  • Registration filing
  • Registered agent, free first year
  • Same price in any state

For

  • Ready for state number three
  • $199 plus Idaho's fee
  • Year-one agent included

Against

  • Renewal $50 over ID Registered Agent.org
Mainstay Filing sitePartner link. We may earn money if you buy.
2Idaho specialist

2. ID Registered Agent.org: best for one extra state

Register for $199; agent renews at $99

ID Registered Agent.org ranks second since registration is $199 over the state fee, agent covered in year one, then $99 a year.

Price covers

  • Idaho registration filing
  • Agent for year one

For

  • $199 plus state fee
  • First agent year comes with it
  • Agent renews at $99

Against

  • Idaho only; home state needs another agent
ID Registered Agent.org sitePartner link. We may earn money if you buy.
3Idaho specialist

3. Idaho Registered Agent.co: best for one more state only

Register for $199; agent renews at $99

Idaho Registered Agent.co ranks third since registration is $199 over the state fee, agent covered in year one, then $99 a year.

It charges exactly what ID Registered Agent.org charges.

Price covers

  • Idaho registration filing
  • Agent for year one

For

  • $199 plus state fee
  • First agent year comes with it
  • Agent renews at $99

Against

  • Idaho only; home state needs another agent
Idaho Registered Agent.co sitePartner link. We may earn money if you buy.

Comparison

#ServiceYear 1Renewal3-year costIncludes
1Mainstay Filing$199$149/yr$497registration filing; registered agent, free first year; same price in any stateMainstay Filing sitePartner link. We may earn money if you buy.
2ID Registered Agent.org$199$99/yr$397idaho registration filing; agent for year oneID Registered Agent.org sitePartner link. We may earn money if you buy.
3Idaho Registered Agent.co$199$99/yr$397idaho registration filing; agent for year oneIdaho Registered Agent.co sitePartner link. We may earn money if you buy.
Service fees only, from company price pages read November 13, 2026. State fees are identical for every pick.

Questions and replies

When must an out-of-state LLC register?

Before it does business in Idaho, with the Idaho Secretary of State, Business Services.

Unregistered, an LLC may face it cannot sue in Idaho courts until registered (Idaho Code 30-21-502(b)).

archive.sos.idaho.gov (October 2026) is the source of record

Cost to register?

$100 to the state, plus $199 for a service.

State fees through year three: $100. legislature.idaho.gov (October 2026) is the source of record

What registers the LLC?

Once the Idaho Secretary of State, Business Services accepts the Foreign Registration Statement, the LLC is registered.

Attach certificate of existence (certificate of good standing) from the home state issued in the last 90 days.

What is due after registering?

The annual report: no fee.

Deadline per the state: Before the end of the month in which the LLC registered.

Why this order?

Chores removed from your list (26%) goes to Mainstay Filing.

62% of the total is three-year price plus chores removed from your list.

An out-of-state LLC works in two states; the first pick serves both.

Method

Idaho: registration requirements, sourced

RequirementDetailOfficial page
Fee to register$100legislature.idaho.gov (October 2026) is the source of record
Home-state certificateYes, 90 daysarchive.sos.idaho.gov (October 2026) is the source of record
State fees, 3 years$100Sum of the rows above
The last row adds the filing, two reports and any minimum tax. Variable costs are explained in the text and left out of the sum.

More replies

Is an agent needed at home too?

Yes: two states, two rule sets. Mainstay Filing works in both; one-state services do not.

What do the picks cost over three years?

Mainstay Filing will run $497, ID Registered Agent.org will run $397, Idaho Registered Agent.co will run $397, before state fees.

Are the fees official?

State fees come from Idaho's official documents. Service prices come from each company's price page. Both are dated here.

Is a service required?

Not required. The state takes filings from owners.

Does a service file it?

All of them do; only the service fee differs.

Which foreign registration service should I use in Idaho?

Mainstay Filing, because you pay $199 plus Idaho's fee, nothing for the registered agent in year one, then $149 a year. Then ID Registered Agent.org and Idaho Registered Agent.co.

Source list

  1. Reference line for Idaho yearly filing: Annual report, drawn from legislature.idaho.gov and confirmed October 2026, as noted by our editors
  2. Reference line for Idaho Code § 30-25-201, drawn from legislature.idaho.gov and confirmed August 2026, as noted by our editors
  3. Reference line for Idaho formation fee: Filing fee, drawn from sos.idaho.gov and confirmed October 2026, as noted by our editors
  4. Reference line for Idaho formation fee: Filing fee, drawn from legislature.idaho.gov and confirmed October 2026, as noted by our editors
  5. Reference line for Idaho registered agent statute, drawn from legislature.idaho.gov and confirmed October 2026, as noted by our editors
  6. Reference line for Idaho Secretary of State, Foreign, drawn from archive.sos.idaho.gov and confirmed October 2026, as noted by our editors
  7. Reference line for Idaho Secretary of State, business, drawn from sos.idaho.gov and confirmed October 2026, as noted by our editors
  8. Reference line for Idaho Code 30-21-505, activities that, drawn from legislature.idaho.gov and confirmed October 2026, as noted by our editors
  9. Reference line for Idaho Code 30-21-213, annual report, drawn from legislature.idaho.gov and confirmed October 2026, as noted by our editors
  10. Reference line for Withdrawal of Foreign Registration Statement, drawn from archive.sos.idaho.gov and confirmed October 2026, as noted by our editors
  11. Reference line for Idaho Code 30-21-502, registration to, drawn from legislature.idaho.gov and confirmed November 2026, as noted by our editors
  12. Price page: Mainstay Filing Idaho service page, accessed November 13, 2026
  13. Price page: ID Registered Agent.org pricing page, accessed November 13, 2026
  14. Price page: Idaho Registered Agent.co pricing page, accessed November 13, 2026