Best LLC Filing

Best LLC Filing › Illinois

Best LLC service in Illinois (2026)

Mainstay Filing is the best overall LLC service in Illinois. The state fee is $150 (Articles of Organization (LLC-5.5), filed with the Illinois Secretary of State); with Mainstay Filing the three-year total is $897.

  • Official sources, checked October 20, 2026
  • Prices verified October 2026
Best overall in Illinois

Mainstay Filing

Our rating: 4.9 out of 5

$199 / year + $150 state fee

  • LLC formation, prepared and filed
  • Registered agent, all year
  • EIN application (with an SSN or ITIN)
  • Annual report filed every year it is due where the state requires one
  • Compliance reminders and stored documents

Price from the Mainstay Filing pricing and FAQ pages, checked October 21, 2026. State fees are passed through at cost and shown before you pay.

Best-for picks with Illinois costs

  1. Best overall: Mainstay Filing ($597 over 3 years; $897 over 3 years with Illinois costs). One $199 price a year covers the formation filing, registered agent, EIN application and annual report, and it stays $199 at renewal.
  2. Lowest first-year cost: Bizee ($0 for year 1 with an agent; $598 over 3 years with Illinois costs). Its entry package is $0 plus the state fee and the registered agent is free for the first year when you form with it. Why
  3. Lowest three-year cost: Northwest Registered Agent ($289 over 3 years; $589 over 3 years with Illinois costs). A $39 package with the agent included the first year, then a $125 agent, adds up to the smallest service total over three years. Why
  4. Lowest agent price after year 1: Northwest Registered Agent ($125 a year from year 2; $589 over 3 years with Illinois costs). Its registered agent renews at the lowest rate of the five. Why
  5. Most included in one price: Mainstay Filing ($199 a year, all-in; $897 over 3 years with Illinois costs). Formation, agent, EIN application and annual report filing share one yearly price; the others sell the agent, EIN or report filing separately. Why

Illinois rules that affect your choice

State filing fee
$150
Yearly report
Limited Liability Company Annual Report, every year, $75
Registered agent
Required. An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent.

Questions

What is the best LLC service in Illinois?

Mainstay Filing. In Illinois it totals $897 over three years including the $150 filing fee, with the agent, EIN application and annual reports covered.

What is the cheapest way to start a Illinois LLC?

Filing yourself costs the $150 state fee and you still need a registered agent with a street address in the state. Among services, Bizee is lowest in year 1 and Northwest Registered Agent over three years.

Is a service worth it in Illinois?

Illinois requires a registered agent, which a service provides for you. A service can also file the Limited Liability Company Annual Report each time it is due.

Sources