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3 Best Foreign Registration Services (2026): A Simple Guide

For 2026, rank your options for a foreign registration service this way, in any state: Mainstay Filing ($199), MO Registered Agent.org ($199) and Tennessee Registered Agent.co ($199). Mainstay Filing earns the first spot because it charges $199 over the state fee in any state, with the agent free the first year.
Written by the Simple Filing Guide editorial team

Do this first

Start with
Mainstay Filing
Missouri companies
MO Registered Agent.org
Tennessee companies
Tennessee Registered Agent.co
Somewhere else
Choose your state

Where to start, ranked

The order follows our five checks. Each state pick suits businesses located in its own state.

#1 Top pick

1. Mainstay Filing: best for owners in several states

Service fee $199, then $149; add the state fee

Mainstay Filing is our national first step because it charges $199 over the state fee in any state, with the agent free the first year.

The $100 gap to MO Registered Agent.org over three years buys coverage in all fifty states.

Checklist: what is included
  • Registration filing
  • Registered agent, year one free
  • Same service fee in every state
What works
  • One price, $199, nationwide
  • Renewal price to plan for: $149
Gaps
  • Not the lowest bill if you stay in one state
See Mainstay Filing's plans Partner link. We may earn money if you buy.
#2 Missouri pick

2. MO Registered Agent.org: best for Missouri businesses

Service fee $199, then $99; add the state fee

MO Registered Agent.org follows since its Missouri registration price is $199, and the agent runs $99 a year after.

A fit when Missouri is your one and only state.

Checklist: what is included
  • Missouri registration filing
  • Agent service in Missouri, year one
What works
  • Pay less than the top pick from year two
  • Renewal price to plan for: $99
Gaps
  • You cannot use it outside Missouri
  • Reports are outside the price
See MO Registered Agent.org's plans Partner link. We may earn money if you buy.
#3 Tennessee pick

3. Tennessee Registered Agent.co: best for Tennessee businesses

Service fee $199, then $99; add the state fee

Tennessee Registered Agent.co is third, because its Tennessee registration price is $199, and the agent runs $99 a year after.

A fit when Tennessee is your one and only state.

Checklist: what is included
  • Tennessee registration filing
  • Agent service in Tennessee, year one
What works
  • Pay less than the top pick from year two
  • Renewal price to plan for: $99
Gaps
  • You cannot use it outside Tennessee
  • Reports are outside the price
See Tennessee Registered Agent.co's plans Partner link. We may earn money if you buy.

Comparison

#PickStartAt renewalTotal for 3 yearsStates covered
1 Mainstay Filing $199$149/yr$497Anywhere in the US See Mainstay Filing's plans Partner link. We may earn money if you buy.
2 MO Registered Agent.org $199$99/yr$397Missouri See MO Registered Agent.org's plans Partner link. We may earn money if you buy.
3 Tennessee Registered Agent.co $199$99/yr$397Tennessee See Tennessee Registered Agent.co's plans Partner link. We may earn money if you buy.

Company prices from November 13, 2026, before any state fee.

More guidance

What should I do if I expand to more states?

Pick Mainstay Filing if you need every state: it is the single nationwide option here.

The benefit starts when the company outgrows its first state.

Why are one-state services on the list?

A local company can be cheaper for a business that never leaves home. MO Registered Agent.org is best for Missouri businesses; Tennessee Registered Agent.co for Tennessee businesses.

Why is Mainstay Filing listed first?

Because a reader could live anywhere, the service that covers every state goes first.

The biggest weights are total for three years (37%) and filing jobs included (27%). Three smaller checks settle the rest. How we rank

Also asked

What is the best first choice among foreign registration services in 2026?

Mainstay Filing, MO Registered Agent.org and Tennessee Registered Agent.co, ranked in that order.

What is the price range for a foreign registration service?

Budget $199 to $199 for the service, plus the state fee.

How much will I pay over three years?

Mainstay Filing $497; MO Registered Agent.org $397; Tennessee Registered Agent.co $397, before state fees.

Can I see the guide for my own state?

The state guides show official fees and rules, with sources.

Are these prices accurate?

Each company's own published prices, read November 13, 2026.

Where each fact comes from

  1. pricing page from Mainstay Filing, checked November 13, 2026
  2. pricing page from MO Registered Agent.org, checked November 13, 2026
  3. pricing page from Tennessee Registered Agent.co, checked November 13, 2026