LLC Review Desk's 2026 picks for registered agents in Montana, favorite first, are Registered Agent MT.org ($99 a year), Mainstay Filing ($149 a year) and Montana Registered Agent.co ($99 a year). Registered Agent MT.org is our favorite, because you pay a flat $99 a year, and papers served on the company are scanned into your account.
By the LLC Review Desk editorial team
Position 1
Top pick on this page
1. Registered Agent MT.org: best for the smallest yearly price on this list
$99 a year, the same each year
Our score
9.1out of 10
9.1 out of 10
Our favorite is Registered Agent MT.org, because it's $99 a year, and the price stays put at renewal, the smallest yearly price among these picks.
Sign up with Registered Agent MT.org and the company has an in-state street address as its registered office, plus online scans of served papers.
You pay less over three years than with Mainstay Filing.
In the price
The in-state street address the state requires
The company's served papers show up in your account as scans
What we like
$99 annually with no renewal bump
A lower yearly price than Mainstay Filing
Formation comes with a free first agent year
Trade-offs
The annual report is a job that stays with you
Built for Montana; other states need another agent
Coming in second is Mainstay Filing, because you pay $149 a year whether you stay in one state or grow, and your first three government letters each year are scanned free.
Starting from scratch? The $199 yearly package adds the Montana filing and the annual report.
Registered Agent MT.org is $150 cheaper over three years, so Mainstay Filing comes second on cost.
In the price
A real registered office address inside the state
Same-business-day scanning of anything served on the company, no charge
Scanning is free for your first three government mailings annually
Compliance reminders
What we like
Your first three government letters each year, scanned for free
Same-business-day scans of papers served on the company, no charge
Fine for LLCs, corporations, LPs, LLPs and nonprofits
$149 a year and it stays flat
Trade-offs
The agent plan alone is $50 a year more than Registered Agent MT.org
Unless you buy the formation package, you file the annual report yourself
3. Montana Registered Agent.co: best for Montana specialists
$99 a year, the same each year
Our score
8.6out of 10
8.6 out of 10
In third place is Montana Registered Agent.co, because it's $99 a year, and the price stays put at renewal, the smallest yearly price among these picks.
Montana Registered Agent.co takes care of the registered office with a street address in the state and scans everything served there.
Price and features don't set Registered Agent MT.org apart from Montana Registered Agent.co; pick the one you like.
In the price
The in-state street address the state requires
The company's served papers show up in your account as scans
What we like
Also forms LLCs, first agent year included
You pay $99 a year, renewals included
A lower yearly price than Mainstay Filing
Trade-offs
The annual report is a job that stays with you
Built for Montana; other states need another agent
Every score out of 10 is our editors' call, made with the weighted criteria on How we rank, not a customer rating.
What Montana registered agents cost in 2026: year one, renewals and three years
Service
First year
Second year
Third year
Three-year total
Same price when you renew
Registered Agent MT.org
$99
$99
$99
$297
Yes
Mainstay Filing
$149
$149
$149
$447
Yes
Montana Registered Agent.co
$99
$99
$99
$297
Yes
We took each price from the company's own pages on November 12, 2026. Montana's own fees stay the same no matter which agent you choose.
How we scored these
LLC Review Desk gives three-year cost 29% and filings in the price 29%, then divides 42% among renewal price, state fit and up-front totals. For Montana, it came down to three-year cost.
Registered Agent MT.org comes to $297 over three years, which is $150 less than Mainstay Filing. If you only need an agent in Montana, fifty-state reach doesn't help much, so the lower yearly price won.
You can read every criterion and weight on How we rank.
What Montana says about the registered agent (via Montana Secretary of State)
Every LLC must name a registered agent with an in-state street address. The address has to be an actual street address or rural route box number in Montana. A P.O. box alone is not enough. The law: Mont. Code Ann. § 35-7-105.
The Montana annual report: when and how much
Here's the schedule: the annual report is due every year in Montana, by April 15. It costs $20. If you're late, add $15. Reminders from the state go to your registered agent.
Your questions about Montana registered agents
Do I really need a registered agent for a Montana LLC?
You do. Montana won't accept an LLC without a registered agent who has a street address in the state, and that name goes on the public record.
What do Montana registered agents usually cost per year?
Plan on $99 to $149 a year, and each service keeps its price when you renew.
Can I be my own registered agent?
Sometimes, if you meet the state's rules. A commercial registered agent listed with the Secretary of State, or a noncommercial agent: an individual, including an owner, or an entity in Montana.
When do I have to send in the Montana annual report?
Mark April 15 on your calendar. The state's charge is $20, and sending it late tacks on $15.
Which registered agents did we review here?
Registered Agent MT.org ($99 a year), Mainstay Filing ($149 a year) and Montana Registered Agent.co ($99 a year), with our favorite first.
Who is the best registered agent for Montana?
Registered Agent MT.org, because it focuses on Montana at $99 a year and gives you an in-state street address for the registered office.