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Founder Mentor Guide

Mentor walkthrough 2 · Illinois

Illinois Registered Agent Walkthrough (2026): 6 Stages and the 3 Best Agents

If you want help with naming a registered agent in Illinois in 2026, phone IL Registered Agent.org ($99 a year), Mainstay Filing ($149 a year) and Illinois Registered Agent.co ($99 a year), in that order. Work through the 6 stages below and your registered agent is sorted out.

Advice from the Founder Mentor Guide mentors

Read this first

Must you name one?
Yes
ilga.gov, seen in October 2026
Service prices
$99 to $149 a year
Published rates
Limited Liability Company Annual Report
$75 a year
ilsos.gov, seen in October 2026
Stages in this walkthrough
6
Each one explained

What this walkthrough covers

  • The Illinois agent rule
  • Who can serve and from what address
  • Naming the agent with the state
  • How the picks compare

Our shortlist for Illinois

Three-year cost and work taken off your desk weigh the most; how we score lists all five.

Our call

1. IL Registered Agent.org: best for a low yearly agent fee

Start with this one$99 a year, $99 when it renews

Start with IL Registered Agent.org; a street address in the state for $99 a year.

Cost settles it: three years here come to less than at Mainstay Filing.

What you get

  • A physical address in Illinois
  • Served documents appear online

What works

  • A flat $99 yearly
  • Yearly price below the national pick

What to watch

  • Another state means another agent
  • You finish the Limited Liability Company Annual Report on your own
Visit IL Registered Agent.orgPartner link. We may earn money if you buy.

Our call

2. Mainstay Filing: best for owners planning to grow

Any state$149 a year, $149 when it renews

Second place goes to Mainstay Filing, since $149 a year with a single provider, however many states the LLC ends up in.

IL Registered Agent.org comes in $150 cheaper across three years, enough to keep this one out of first.

What you get

  • A street address for the registered office
  • Papers served on the company are scanned for you, no charge
  • Up to three government mailings a year are scanned for free
  • Also works for nonprofits, corporations, LPs and LLPs

What works

  • Works in all fifty states
  • $149 each year, no increase

What to watch

  • $50 a year above IL Registered Agent.org
  • Reports remain your job
Visit Mainstay FilingPartner link. We may earn money if you buy.

Our call

3. Illinois Registered Agent.co: best for an in-state mailing address

Illinois specialist$99 a year, $99 when it renews

Illinois Registered Agent.co comes in third: a street address in the state for $99 a year.

Its prices are identical to IL Registered Agent.org's, so either is fine on cost.

What you get

  • A physical address in Illinois
  • Served documents appear online

What works

  • Yearly price below the national pick
  • A flat $99 yearly

What to watch

  • Another state means another agent
  • You finish the Limited Liability Company Annual Report on your own
Visit Illinois Registered Agent.coPartner link. We may earn money if you buy.

Scores and prices together

#ServiceAnnual priceRenewal priceThree-year total
1IL Registered Agent.org$99$99/yr$297Visit IL Registered Agent.orgPartner link. We may earn money if you buy.
2Mainstay Filing$149$149/yr$447Visit Mainstay FilingPartner link. We may earn money if you buy.
3Illinois Registered Agent.co$99$99/yr$297Visit Illinois Registered Agent.coPartner link. We may earn money if you buy.
Pulled from each price page on November 13, 2026. The state bills the same no matter which agent you name.

The walkthrough, stage by stage

  1. Stage 1

    The Illinois rule in plain terms

    Every LLC must name a registered agent with an in-state street address.

    Check it yourself: ilga.gov, seen in October 2026

  2. Stage 2

    Who can do this

    An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent. The rule comes from 805 ILCS 180/1-35.

  3. Stage 3

    Choose a compliant address

    The address has to be a registered office in Illinois that matches the agent's business office. A P.O. box alone is not accepted.

    A service keeps your home address off public records.

  4. Stage 4

    Choose the person or company

    A qualified owner can act as agent. Prefer to hand it off? Our recommended agents bill $99 to $149 yearly.

  5. Stage 5

    Make the agent official

    You name the agent when you file the Articles of Organization (Form LLC-5.5); to replace the agent later you file again with the Illinois Secretary of State.

    Check it yourself: ilsos.gov, seen in October 2026

  6. Stage 6

    Update when something changes

    Illinois checks the agent's details through the Limited Liability Company Annual Report ($75, every year, due before the first day of the entity's anniversary month); letters about it go to your registered agent.

    Check it yourself: ilsos.gov, seen in October 2026

The bill

StageWho gets paidAmount
Agent serviceYour service$99 to $149 a year
From year twoYour service$99 to $149 a year
Limited Liability Company Annual ReportPaid to the state$75 every year
Add the filing fee, two later reports and any minimum tax and you have the state's three-year total. The pages listed below show where each figure came from.

The thinking behind the order

On three-year bill (32% of the score) finished first, with right behind.

IL Registered Agent.org wins the cost score at $297 over three years, against $150 more at Mainstay Filing.

What founders ask

Is having a registered agent the law in Illinois?

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

Can I be my own registered agent?

An owner can serve when eligible; the tests sit in stages 2 and 3.

Can I change my registered agent later?

Change it whenever you like through the Illinois Secretary of State, as stage 5 describes.

What does a registered agent cost in Illinois?

The agents we recommend charge $99 to $149 a year.

What does the LLC pay the state each year?

$75, every year, for the Limited Liability Company Annual Report.

Which registered agent would you choose?

Go with IL Registered Agent.org: $99 yearly, and scans of served papers land in an online account. Then Mainstay Filing and Illinois Registered Agent.co.

Where we got the facts

  1. Illinois Secretary of State, Department of Business Services: go straight to ilsos.gov, checked August 2026.
  2. Illinois Secretary of State, Department of Business Services: go straight to ilsos.gov, checked August 2026.
  3. 805 ILCS 180/5-5: go straight to ilga.gov, checked August 2026.
  4. Illinois formation fee: Filing fee, official source: go straight to ilga.gov, checked October 2026.
  5. Illinois formation fee: Filing fee, official source: go straight to ilsos.gov, checked October 2026.
  6. Illinois registered agent statute: go straight to ilga.gov, checked October 2026.
  7. We opened IL Registered Agent.org's pricing page on November 13, 2026 for the prices
  8. We opened Mainstay Filing's Illinois service page on November 13, 2026 for the prices
  9. We opened Illinois Registered Agent.co's pricing page on November 13, 2026 for the prices