3 Best LLC Services in Montana (2026): A Simple Guide
Your 2026 shortlist for LLC formation services in Montana reads Mainstay Filing ($199), Montana Registered Agent.co ($199) and Registered Agent MT.org ($199), in our order. Every option pays the same $35 filing fee, and three years of service cost $397 to $597.
Written by the Simple Filing Guide editorial team
Quick guide
Cost to file
$35, once, up front
Ongoing
$20 annually
Registered agent
Yes, by law
Recommended
Mainstay Filing, Montana Registered Agent.co then Registered Agent MT.org
Our Montana shortlist
Prices come from each company's own page. Read how we rank for the method.
#1Number 1
1. Mainstay Filing: best for owners who want upkeep handled
$199 yearly ($234 at signup, state fee included)
Start with Mainstay Filing in Montana: a single price of $199 a year includes the formation, the registered agent and each annual report.
The $200 gap to Montana Registered Agent.co over three years pays for jobs you would otherwise do.
It files your annual report and passes along the state's $20 at cost.
Checklist: what is included
Articles prepared and filed
Registered agent for the whole year
Annual report handled when due
EIN request filed
State fee with no markup
What works
Everything above is included in $199
No extra fee to get your EIN
You pay $199 again next year
Gaps
A $100 annual premium compared with Montana Registered Agent.co
These are service fees only, taken from each company's prices on November 13, 2026. State fees stay the same with every pick.
The key questions
What will forming an LLC cost in this state?
The state takes $35; if you hire a service in year one, add $199.
Over three years the state collects $75 in total, filing fee included. verify at sosmt.gov, as of October 2026
What starts the LLC?
Submit the Articles of Organization to the Montana Secretary of State and wait for approval.
Read the rule: Mont. Code Ann. § 35-8-201. verify at sosmt.gov, as of October 2026
Must I name a registered agent?
Every LLC must name a registered agent with an in-state street address.
A commercial registered agent listed with the Secretary of State, or a noncommercial agent: an individual, including an owner, or an entity in Montana.
It is allowed, and doing it yourself keeps the three-year cost at $75.
Services bill $397 to $597 across three years for taking this on.
Why is number one first?
Mainstay Filing wins on filing jobs included, a 27% check.
Five checks set the order: total for three years (37%), filing jobs included (27%), clear price information (13%), year-two price (12%) and state coverage (11%).
We rate a filed annual report above a few dollars saved, so the bundle comes first.
Last row = filing fee + report in year two + report in year three + minimum tax, if any. Variable costs are described in the text, not added.
Quick answers
Does the price cover the EIN?
Budget $99 for Montana Registered Agent.co or $99 for Registered Agent MT.org to get an EIN, and nothing extra at Mainstay Filing.
Is there a late fee?
You will owe $15 extra.
What is the three-year cost of each?
$597 for Mainstay Filing, $397 for Montana Registered Agent.co, $397 for Registered Agent MT.org, with state fees on top.
Are the fees official?
Official Montana documents supply the state fees, and the companies' own pricing pages supply the service fees. Both carry dates on this page.
Do I have to use a service?
Hiring is optional. The law requires a filing, not a filer.
Which LLC service should I start with in Montana?
Mainstay Filing, because none of the others files the annual report for you, and here it comes with $199 a year. Then Montana Registered Agent.co and Registered Agent MT.org.
Sources and price pages
Source for Montana Secretary of State fee: sosmt.gov, October 2026
Source for Montana yearly filing: Annual report: sosmt.gov, October 2026
Source for Montana yearly filing: Annual report: sosmt.gov, October 2026
Source for Montana report due date: mca.legmt.gov, August 2026