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Straight talk · Idaho

3 Best Foreign Registration Services in Idaho (2026): Our Honest Take

Our 2026 favorites for foreign registration services in Idaho are Mainstay Filing ($199), Idaho Registered Agent.co ($199) and ID Registered Agent.org ($199), best first. The state's fee is $100; service fees for three years are $397 to $497.
From the LLC Plainly editorial team

Quick take

What the state charges
$100
Attach a certificate?
Yes, attach it (90 days at most)
What comes next
Free, annual report
Our ranking
Mainstay Filing, Idaho Registered Agent.co then ID Registered Agent.org

Who we'd use in Idaho

Ranked best first using the checks on our method page.
Our favorite

1. Mainstay Filing: best for the same fee anywhere

First year $199 (state's $100 separate); $149 after

Number one is Mainstay Filing, since its $199 fee is the same in every state, and the first registered agent year comes with it.

Over three years you'd pay $100 more than with Idaho Registered Agent.co, and that buys service in every state.

Starting in year two, the registered agent runs $149 a year.

Your money buys

  • Out-of-state registration handled
  • Registered agent, free in year one
  • Fifty states, one fee

The good

  • One fee for any state
  • $199, with state fees on top
  • First-year agent is on the house

Trade-offs

  • You'd pay $50 a year more for the agent
Idaho specialist

2. Idaho Registered Agent.co: best for adding just this one state

First year $199 (state's $100 separate); $99 after

Why Idaho Registered Agent.co second? Honestly, registering costs $199 above the state fee and the agent is covered in year one, then $99 a year.

Your money buys

  • Application sent in for you
  • Agent included for year one

The good

  • Year one of the agent comes with it
  • Year two onward: $99
  • Just $199 to register

Trade-offs

  • Works in Idaho alone, so your home state needs its own agent
Idaho specialist

3. ID Registered Agent.org: best for adding one more state

First year $199 (state's $100 separate); $99 after

Why ID Registered Agent.org third? Honestly, registering costs $199 above the state fee and the agent is covered in year one, then $99 a year.

Idaho Registered Agent.co charges the same, which makes this nearly a tie.

Your money buys

  • Application sent in for you
  • Agent included for year one

The good

  • Year two onward: $99
  • Year one of the agent comes with it
  • Just $199 to register

Trade-offs

  • Works in Idaho alone, so your home state needs its own agent

Price check

#ServiceYear oneRenews atThree-year totalCovers
1Mainstay Filing$199$149/yr$497Out-of-state registration handled; registered agent, free in year one; fifty states, one feeSee what Mainstay Filing offersPartner link. We may earn money if you buy.
2Idaho Registered Agent.co$199$99/yr$397application sent in for you; agent included for year oneSee what Idaho Registered Agent.co offersPartner link. We may earn money if you buy.
3ID Registered Agent.org$199$99/yr$397application sent in for you; agent included for year oneSee what ID Registered Agent.org offersPartner link. We may earn money if you buy.
We read these prices on November 13, 2026. Three years means year one plus two renewals.

Your questions, answered

When does my LLC need to register?

An out-of-state LLC signs up with the Idaho Secretary of State, Business Services first and does business in Idaho afterward.

Doing business unregistered can bring it can't be a plaintiff (Idaho Code 30-21-502(b)).

official: archive.sos.idaho.gov, October 2026

What does it cost to register in a new state?

Budget $100 for the state and $199 for help.

The state's three-year fees, registration included, add up to $100. official: legislature.idaho.gov, October 2026

Where does the registration go?

Once the Idaho Secretary of State, Business Services approves the Foreign Registration Statement, you're registered.

You'll send in certificate of existence (certificate of good standing) from the home state newer than 90 days.

What do I owe after registering?

After registering, count on the annual report: no fee.

Mark the date: Before the end of the month in which the LLC registered.

What put number one on top?

Mainstay Filing is strongest on work taken off your hands, which counts for 31% of our score.

We start with cost across three years, move to work taken off your hands, and finish with three smaller checks.

Idaho Registered Agent.co only covers Idaho, so you'd need someone else at home.

Read the method

Idaho rules at a glance

The ruleDetailsWhere we found it
Application fee$100official: legislature.idaho.gov, October 2026
Document from your home stateYes, attach it, 90 daysofficial: archive.sos.idaho.gov, October 2026
Paid to the state by year three$100Rows above, totaled
The bottom row isn't a state figure. It's our total of the filing fee, the next two reports and the minimum tax, if the state has one.

Also worth knowing

Do I still need an agent where I formed the LLC?

You do. Two states mean two sets of rules, and a one-state company stops at its border while Mainstay Filing keeps going.

What's the three-year total for each?

Three-year totals are Mainstay Filing, $497; Idaho Registered Agent.co, $397; ID Registered Agent.org, $397 for the services alone.

How official are these figures?

Idaho's fee schedules and forms for state costs; each company's price page for service costs.

Does the state make me use a service?

No. The state takes filings straight from owners. A service saves you time and can serve as your agent, but nobody makes you hire one.

Is filing included in what they sell?

Yes. Every pick prepares and files it, and the state fee is the same no matter who you pick.

Who tops the list in Idaho?

Mainstay Filing is on top because you pay $199 plus Idaho's fee, skip the registered agent charge in year one and then pay $149 a year; Idaho Registered Agent.co and ID Registered Agent.org follow.

Where we got this

  1. legislature.idaho.gov: the page for Idaho yearly filing: Annual report, seen October 2026
  2. legislature.idaho.gov: the page for Idaho Code § 30-25-201, seen August 2026
  3. sos.idaho.gov: the page for Idaho formation fee: Filing fee, seen October 2026
  4. legislature.idaho.gov: the page for Idaho formation fee: Filing fee, seen October 2026
  5. legislature.idaho.gov: the page for Idaho registered agent statute, seen October 2026
  6. archive.sos.idaho.gov: the page for Idaho Secretary of State, Foreign, seen October 2026
  7. sos.idaho.gov: the page for Idaho Secretary of State, business, seen October 2026
  8. legislature.idaho.gov: the page for Idaho Code 30-21-505, activities that, seen October 2026
  9. legislature.idaho.gov: the page for Idaho Code 30-21-213, annual report, seen October 2026
  10. archive.sos.idaho.gov: the page for Withdrawal of Foreign Registration Statement, seen October 2026
  11. legislature.idaho.gov: the page for Idaho Code 30-21-502, registration to, seen November 2026
  12. We read the Mainstay Filing Idaho service page on November 13, 2026
  13. We read the Idaho Registered Agent.co pricing page on November 13, 2026
  14. We read the ID Registered Agent.org pricing page on November 13, 2026