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Registered agent cost calculators + Montana

3 Best Registered Agents in Montana (2026): Cost Calculator

Our 2026 calculation puts Mainstay Filing ($149/yr), Montana Registered Agent.co ($99/yr) and Registered Agent MT.org ($99/yr), in that order, at the top of Montana registered agents. Entered at $99 to $149 for the first year, the agents total $297 to $447 after three.
Calculated by the Formation Calc editorial team

Result order: Formula: 41% cost, 27% coverage, three lesser terms. Details

Montana: key outputs

Must the LLC have a registered agent?Yesmca.legmt.gov {input read October 2026, shown in full}
Opening results$99 to $149Charged per year
What three years calculate to$297 to $447Opening input plus two more
Annual report$20 per yearsosmt.gov {input read October 2026, shown in full}
Break-evenTotals stay apartOrder holds for ten years

Montana ranking

Ranked by the formula. The agent you name has no bearing on state fees.
1

1. Mainstay Filing: best for the same input in every state

Top result
Year-1 input$149
Renewal input$149/yr
Result at year 3$447
$149 per year, moving to $149

Mainstay Filing calculates best. A steady $149 a year, whatever state is entered.

Its three-year result is $150 higher than Montana Registered Agent.co's, yet the added filings it covers weigh more in the formula.

Inputs covered

  • The registered office address
  • Up to three government mailings a year, scanned free
  • Covers LLCs, corporations, LPs, LLPs and nonprofits

Adds up well

  • The same price in all fifty states
  • $149 a year, no change at renewal

Adds up badly

  • Adds $50 extra annually
  • Covers the agent role only
2

2. Montana Registered Agent.co: best for LLCs that never leave one state

Montana focus
Year-1 input$99
Renewal input$99/yr
Result at year 3$297
$99 per year, moving to $99

Position 2 is Montana Registered Agent.co: a single state, $99 a year, $99 after it renews.

Inputs covered

  • An address in the state on record
  • Served papers appear in your login

Adds up well

  • Year 1 $99, year 2 $99
  • A lower yearly price than Mainstay Filing

Adds up badly

  • One-state service
  • The annual report is not in the input
3

3. Registered Agent MT.org: best for a second local option

Montana focus
Year-1 input$99
Renewal input$99/yr
Result at year 3$297
$99 per year, moving to $99

Position 3 is Registered Agent MT.org: a single state, $99 a year, $99 after it renews.

No difference in price from Montana Registered Agent.co.

Inputs covered

  • An address in the state on record
  • Served papers appear in your login

Adds up well

  • Year 1 $99, year 2 $99
  • A lower yearly price than Mainstay Filing

Adds up badly

  • One-state service
  • The annual report is not in the input

Running total by year

RankServiceResult, year 1Result, year 2Result, year 3Result, year 5
1Mainstay Filing$149$298$447$745Open Mainstay FilingPartner link. We may earn money if you buy.
2Montana Registered Agent.co$99$198$297$495Open Montana Registered Agent.coPartner link. We may earn money if you buy.
3Registered Agent MT.org$99$198$297$495Open Registered Agent MT.orgPartner link. We may earn money if you buy.
Prices entered November 13, 2026. Every column adds a renewal. Ranked by running result, the order is steady for ten years.

Try other years

Results for 1 to 5 years. State fees are not an input here because every service owes the same ones.
Running total over 3 years: Mainstay Filing $447, Montana Registered Agent.co $297, Registered Agent MT.org $297. Service with the smallest result: Montana Registered Agent.co.

Official state charges

InputAmountSource
LLC formation filing$35sosmt.gov {input read October 2026, shown in full}
Annual report$20 every yearsosmt.gov {input read October 2026, shown in full}
Late filing charge$15sosmt.gov {input read October 2026, shown in full}
State side, 3 years$75Filing, reports and any tax
The state's three-year figure is a sum of three kinds of charge: the filing fee, the reports owed in years two and three, and a minimum tax where the state levies one. Costs with no fixed amount, such as publication in a newspaper, are noted in the text and left out of the sum.

The working behind Montana

Weight 27%: filing work in the price. That term separated the top two.

One agent for any state beat the one-state price.

The Montana registered agent rule as the state states it (Montana Secretary of State)

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. (Mont. Code Ann. § 35-7-105)

The address has to be an actual street address or rural route box number in Montana. A P.O. box alone is not enough.

As written: mca.legmt.gov {input read October 2026, shown in full}

State fees only

A qualifying owner pays no extra to skip a service. The prices above, $99 to $149 a year, buy convenience.

Questions

What does a Montana registered agent charge per year?

Roughly $99 to $149 yearly.

What do three years of agent service cost?

$297 to $447 in service fees, with state fees on top.

Is a registered agent a must for a Montana LLC?

Yes, it does. Every LLC must name a registered agent with an in-state street address.

Can the owner be the registered agent?

You can, provided you meet both the address and eligibility rules.

What does the state charge the LLC each year?

The repeating input is the annual report, at $20 annually (April 15).

When does one service pass another in total cost?

Not in ten years: the order of the running totals does not change.

Which registered agent calculates best in Montana?

Mainstay Filing calculates best, followed by Montana Registered Agent.co and Registered Agent MT.org.

Keep comparing

Input sources

  1. sosmt.gov is where the Montana Secretary of State fee figure was entered from, October 2026.
  2. sosmt.gov is where the Montana yearly filing: Annual report figure was entered from, October 2026.
  3. sosmt.gov is where the Montana yearly filing: Annual report figure was entered from, October 2026.
  4. mca.legmt.gov is where the Montana report due date figure was entered from, August 2026.
  5. mca.legmt.gov is where the Mont figure was entered from, August 2026.
  6. sosmt.gov is where the Montana formation fee: Filing fee figure was entered from, October 2026.
  7. mca.legmt.gov is where the Montana registered agent statute figure was entered from, October 2026.
  8. Input from Mainstay Filing: Montana service page (November 13, 2026)
  9. Input from Montana Registered Agent.co: pricing page (November 13, 2026)
  10. Input from Registered Agent MT.org: pricing page (November 13, 2026)