3 Best Foreign Registration Services in Idaho (2026): The Straight Story
For foreign registration services in Idaho in 2026, we'd rank Mainstay Filing ($199), Idaho Registered Agent.co ($199) and ID Registered Agent.org ($199), best first. Idaho charges $100 to register no matter who files, and services add $397 to $497 over three years.
Straight from the LLC Straight Talk editorial team
Quick facts
The short of it
State fee to register
$100
Bring a home-state certificate?
Yes (90 days old, tops)
Once you're registered
Nothing, annual report
Our pick
Mainstay Filing, Idaho Registered Agent.co then ID Registered Agent.org
Idaho picks, best first
The order comes from our five tests: three-year cost first, then what the price covers.
#1Our top pick
1. Mainstay Filing: best for adding states down the road
$199 plus the state fee, then $149 a year
Mainstay Filing wins the top spot: it's $199 to register, with a free first registered agent year and $149 a year from then on.
You'd save $100 over three years with Idaho Registered Agent.co, as long as the LLC never leaves Idaho.
You don't pay for the registered agent the first year. From year two, it's $149 annually wherever you registered.
What you get
Registration, start to finish
Registered agent, waived for the first year
The same fee no matter the state
Pluses
Same fee in every state
$199 over the state fee
A free first year of agent service
What's not
Renewal's $50 over Idaho Registered Agent.co
#2Idaho specialist
2. Idaho Registered Agent.co: best for adding this state and no others
$199 plus the state fee, then $99 a year
Idaho Registered Agent.co comes in second because $199 files the registration, and from year two the agent's $99.
What you get
Idaho registration filing
The first agent year's on them
Pluses
Agent renews at $99
The first agent year's included
Service fee of $199
What's not
Your home state needs its own agent
#3Idaho specialist
3. ID Registered Agent.org: best for one added state, and that's it
$199 plus the state fee, then $99 a year
ID Registered Agent.org comes in third because $199 files the registration, and from year two the agent's $99.
It charges what Idaho Registered Agent.co charges.
What you get
Idaho registration filing
The first agent year's on them
Pluses
Service fee of $199
Agent renews at $99
The first agent year's included
What's not
Your home state needs its own agent
The numbers
#
Who
Year one
Then
Three-year total
Covers
1
Mainstay Filing
$199
$149/yr
$497
Registration, start to finish; registered agent, waived for the first year; the same fee no matter the state
Want to check the total? Add the filing fee, the next two reports and any minimum tax. We don't count costs without a set amount.
More questions
Do I still need an agent at home?
Each state sets its own rule, so keep an agent at home too. A provider that works in every state, like Mainstay Filing, can handle both.
What do the picks cost over three years?
Mainstay Filing will set you back $497, and Idaho Registered Agent.co will set you back $397, and ID Registered Agent.org will set you back $397, before state fees.
Are the fees official?
Each state fee links to its official page, and each service price comes from the company's own site.
Do I have to use a service?
No law says you need a service. It's a convenience you pay for.
Will a service file it for me?
Yes. Every pick files it, and the state fee's the same whichever you choose.
Who should I use for a foreign registration service in Idaho?
Mainstay Filing, because you pay $199 on top of the state fee, the registered agent costs nothing in year one, and after that it's $149. After that, Idaho Registered Agent.co and ID Registered Agent.org.