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Plain CharterLLC questions, short answers.

Short answers · Idaho

3 Best Foreign Registration Services in Idaho (2026), Plainly Answered

For foreign registration services in Idaho, our 2026 order is Mainstay Filing ($199), ID Registered Agent.org ($199) and Idaho Registered Agent.co ($199). Idaho takes $100 to register, and the services cost $397 to $497 across three years.

By the Plain Charter editorial team ·

Quick answer

What the state charges
$100
Certificate required?
Yes, needed (90 day limit)
After registering
No charge, annual report
Our picks, in order
Mainstay Filing, ID Registered Agent.org then Idaho Registered Agent.co

Our Idaho list

Our order, explained on how we choose.
1First choice

1. Mainstay Filing: best for a second state and a third

Service $199, agent renewal $149

Mainstay Filing is the one we'd hire first in Idaho, because you pay $199 to register and nothing for the registered agent until year two.

The extra $100 over three years, compared with ID Registered Agent.org, pays for coverage beyond Idaho.

From year two the registered agent costs $149 a year, in any state.

The price covers

  • State registration
  • Registered agent, first year free
  • The same fee in every state

Upsides

  • $199 plus Idaho's fee
  • Same fee in every state
  • Year-one agent included

What to weigh

  • $50 a year more for the agent
Visit Mainstay FilingPartner link. We may earn money if you buy.
2Local choice

2. ID Registered Agent.org: best for a low yearly agent cost

Service $199, agent renewal $99

ID Registered Agent.org ranks second, because it charges $199 to register with a first year of agent service, then $99 a year.

The price covers

  • The Idaho registration filing
  • Agent included, year one

Upsides

  • $199 plus the state fee
  • Then $99 yearly
  • Agent free for year one

What to weigh

  • No coverage outside the state
Visit ID Registered Agent.orgPartner link. We may earn money if you buy.
3Local choice

3. Idaho Registered Agent.co: best for a low agent renewal

Service $199, agent renewal $99

Idaho Registered Agent.co ranks third, because it charges $199 to register with a first year of agent service, then $99 a year.

It charges the same as ID Registered Agent.org; the order between them is a close call.

The price covers

  • The Idaho registration filing
  • Agent included, year one

Upsides

  • Agent free for year one
  • Then $99 yearly
  • $199 plus the state fee

What to weigh

  • No coverage outside the state
Visit Idaho Registered Agent.coPartner link. We may earn money if you buy.

Prices together

#PickYear 1Year two onThree yearsIncludes
1Mainstay Filing$199$149/yr$497state registration; registered agent, first year free; the same fee in every stateVisit Mainstay FilingPartner link. We may earn money if you buy.
2ID Registered Agent.org$199$99/yr$397The Idaho registration filing; agent included, year oneVisit ID Registered Agent.orgPartner link. We may earn money if you buy.
3Idaho Registered Agent.co$199$99/yr$397The Idaho registration filing; agent included, year oneVisit Idaho Registered Agent.coPartner link. We may earn money if you buy.
Each company's published prices, November 12, 2026. State fees come on top and do not change by pick.

Common questions

When is registration required?

If an LLC formed in another state does business in Idaho, it registers first.

The cost of not registering: no lawsuits as plaintiff (Idaho Code 30-21-502(b)).

from archive.sos.idaho.gov · October 2026

How much is foreign registration?

The state charges $100; a service adds $199.

Three years of state fees, registration included: $100. from legislature.idaho.gov · October 2026

Which form, and where does it go?

The Idaho Secretary of State, Business Services accepts the Foreign Registration Statement from LLCs formed elsewhere.

Include certificate of existence (certificate of good standing) from the home state dated within 90 days.

What recurs once registered?

The annual report, which is free.

When: Before the end of the month in which the LLC registered.

Why these three?

What the price takes off your plate (30% of our weighting) put Mainstay Filing first.

What we weigh most: three-year cost (35%) and what the price takes off your plate (30%). Three smaller criteria break close calls.

ID Registered Agent.org serves Idaho only, so your home state would need someone else.

See how we rank

Idaho requirements checklist

RequirementAnswerFrom
Registration fee$100from legislature.idaho.gov · October 2026
Proof of existenceYes, needed, 90 daysfrom archive.sos.idaho.gov · October 2026
State fees, first three years$100Total of these fees
Three-year state total = filing + reports in years 2 and 3 + any minimum tax; variable costs are not added.

FAQ

Does the home state still need an agent?

Usually, yes. One national provider can serve both; a local one cannot.

Over three years, what does each charge?

Mainstay Filing $497, ID Registered Agent.org $397 and Idaho Registered Agent.co $397 (service fees only).

Where do these figures come from?

Idaho's own publications for the state side, published company prices for the rest.

Do I have to use a service?

No, you can file yourself if you meet the rules on this page.

Will these services file it?

Each of our picks prepares and files it; the state fee stays the same.

Who is your first choice in Idaho?

Mainstay Filing tops our list because the registration costs $199 plus state fees, with the registered agent free for year one; ID Registered Agent.org and Idaho Registered Agent.co come next.

Official sources and prices

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