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What forming an LLC costs by state / Illinois

3 Best LLC Services in Illinois (2026): What You Pay

Your best-value options among Illinois LLC formation services for 2026 are Mainstay Filing ($199), IL Registered Agent.org ($199) and Illinois Registered Agent.co ($199), ranked from first to third. You will pay between $397 to $597 to a service across three years, and $150 to Illinois whichever one you choose.
Written by the Price Your LLC editorial team

↓ Ranked for you by: We rank on five things: your spend (38%), your workload (31%) and three smaller ones

The short version

What the state charges you to form $150 ilsos.gov (we looked on October 2026, so you can too)
Your first-year spend $199 State fee not included
What three years cost you $397 to $597 Year one plus two renewals
What the state collects in 3 years $300 Not part of the ranking
Crossover year Not within ten years Order holds for ten years

Your Illinois options

Every price is copied from the company's own pricing page. You pay the $150 state fee separately.

1
Ranks first

1. Mainstay Filing: best for a yearly price you can plan around

$199 a year on top of the $150 state fee
You pay in year 1 $199
You pay after year 1 $199/yr
You pay over 3 years $597

In Illinois, Mainstay Filing is where your money goes furthest, since $199 a year pays for the filing, the registered agent and the annual report, and year two costs $199.

The $200 extra over IL Registered Agent.org at year three pays for coverage, and coverage decides this ranking.

The Limited Liability Company Annual Report is covered, so your only extra is the state's $75.

Your price covers

  • The LLC formation filing
  • Registered agent for the whole year
  • Annual report, filed on time
  • EIN application prepared for you
  • Government fee passed through unchanged

What you get

  • No extra fee for the EIN application
  • $199 per year, all in
  • Renewal stays at $199

What to watch

  • IL Registered Agent.org renews for $100 less
2
Local option

2. IL Registered Agent.org: best for the smallest opening bill

Starts at $199; later years $99
You pay in year 1 $199
You pay after year 1 $99/yr
You pay over 3 years $397

Next, IL Registered Agent.org: $199 pays for formation and the agent adds $99 yearly afterward.

Leave time for the Limited Liability Company Annual Report, because this price skips it.

Your price covers

  • The Illinois formation filing
  • Agent service for your first year

What you get

  • $99 yearly from year two
  • $199 on top of the state fee
  • Agent service at no cost in year one

What to watch

  • Nothing you pay goes to the Limited Liability Company Annual Report
  • EIN add-on: $99
3
Local option

3. Illinois Registered Agent.co: best for owners who prepare their own reports

Starts at $199; later years $99
You pay in year 1 $199
You pay after year 1 $99/yr
You pay over 3 years $397

Next, Illinois Registered Agent.co: $199 pays for formation and the agent adds $99 yearly afterward.

Leave time for the Limited Liability Company Annual Report, because this price skips it.

IL Registered Agent.org lists identical prices.

Your price covers

  • The Illinois formation filing
  • Agent service for your first year

What you get

  • $199 on top of the state fee
  • $99 yearly from year two
  • Agent service at no cost in year one

What to watch

  • Nothing you pay goes to the Limited Liability Company Annual Report
  • EIN add-on: $99

What each service adds up to

Pick Service You pay in year 1 You pay by year 2 You pay by year 3 You pay by year 5
1 Mainstay Filing $199 $398 $597 $995 Price out Mainstay Filing Partner link. We may earn money if you buy.
2 IL Registered Agent.org $199 $298 $397 $595 Price out IL Registered Agent.org Partner link. We may earn money if you buy.
3 Illinois Registered Agent.co $199 $298 $397 $595 Price out Illinois Registered Agent.co Partner link. We may earn money if you buy.

Service fees only, from each company's prices as of November 13, 2026. No service overtakes another within ten years.

Your budget calculator

Tell us how many years you plan to keep the LLC and each service's running total updates; tick the box to add each provider's EIN application.

You would pay Mainstay Filing $597, IL Registered Agent.org $397, Illinois Registered Agent.co $397 over 3 years. Lowest of the totals: IL Registered Agent.org.

Illinois fee list

What you pay for Amount Source
LLC formation filing $150 ilsos.gov (we looked on October 2026, so you can too)
Limited Liability Company Annual Report $75 every year ilsos.gov (we looked on October 2026, so you can too)
Cost of missing the deadline $100 ilsos.gov (we looked on October 2026, so you can too)
What the state collects by year 3 $300 Added up from the lines above

Only amounts the state fixes go into the total: the filing, the next two reports and any minimum tax. Costs the state leaves unpriced are explained instead.

What settled it

Mainstay Filing wins upkeep the price covers, worth 31%, with IL Registered Agent.org close behind.

IL Registered Agent.org costs you less over three years, but the Limited Liability Company Annual Report would still be yours to file.

Count the EIN application in your budget and Mainstay Filing's total overtakes IL Registered Agent.org's in year 2.

What Illinois charges you to form an LLC and what it requires

$150 and the Articles of Organization (Form LLC-5.5), filed with the Illinois Secretary of State, bring your company into existence. Every LLC must name a registered agent with an in-state street address.

In the state's words: ilsos.gov (we looked on October 2026, so you can too)

Doing it alone

Doing it yourself costs $300 paid to the state across three years. A service at $397 to $597 is what you pay to skip the forms.

Illinois money questions

How much will an LLC formation service cost me in Illinois?

$199 in year one, plus the state's $150 filing fee.

What will these services cost me over three years?

$397 to $597 in service fees, with state fees on top.

How much will Illinois charge me to file an LLC?

$150 is due when you submit the Articles of Organization (Form LLC-5.5).

What will Illinois charge me each year after formation?

Limited Liability Company Annual Report: $75 a year, and the state says it is due before the first day of the entity's anniversary month.

Will the EIN application be part of the price?

Mainstay Filing handles it for you, IL Registered Agent.org asks $99 for it and Illinois Registered Agent.co asks $99 for it.

When does one service end up costing more than another?

No break-even inside ten years.

Which LLC formation service is the best value for me in Illinois?

Start with Mainstay Filing, then IL Registered Agent.org, then Illinois Registered Agent.co.

Keep budgeting

What forming an LLC costs by state for all 50 states Best LLC services for anyone How we rank your options

Where we looked

  1. Our source for Illinois Secretary of State, Department is ilsos.gov, from August 2026.
  2. Our source for Illinois Secretary of State, Department is ilsos.gov, from August 2026.
  3. Our source for 805 ILCS 180/5-5 is ilga.gov, from August 2026.
  4. Our source for Illinois formation fee: Filing fee is ilga.gov, from October 2026.
  5. Our source for Illinois formation fee: Filing fee is ilsos.gov, from October 2026.
  6. Our source for Illinois registered agent statute is ilga.gov, from October 2026.
  7. Price page checked November 13, 2026: Mainstay Filing Illinois service page
  8. Price page checked November 13, 2026: IL Registered Agent.org pricing page
  9. Price page checked November 13, 2026: Illinois Registered Agent.co pricing page