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Biz Formation Academy

A plain textbook on LLC paperwork, one state per chapter.

Unit 2 · Illinois

Illinois Registered Agent Chapter (2026): 6 Sections and the 3 Best Agents

Summary for 2026: to handle appointing a registered agent in Illinois with outside help, choose among Mainstay Filing ($149 a year), IL Registered Agent.org ($99 a year) and Illinois Registered Agent.co ($99 a year), in that order. The reader finishes 6 short sections knowing how Illinois wants a registered agent appointed.
Written by the Biz Formation Academy editorial board

Key facts for this chapter

The requirement Yes ilga.gov, as published October 2026
Price of recommended services $99 to $149 a year As each company lists them
Limited Liability Company Annual Report $75 a year ilsos.gov, as published October 2026
Section count 6 Outlined below

What this chapter teaches

  • What Illinois requires of a registered agent
  • The address and eligibility rules
  • Recording the agent
  • The agents ranked highest

Recommended reading for Illinois

Three-year cost and paperwork completed carry the most weight; how we grade lists all five.

1. Mainstay Filing: best for a nationwide agent at one price

Best overall
First year: $149. Second year: $149

In Illinois, Mainstay Filing heads the list: a single yearly charge of $149 follows the company if it registers in a second state.

Over three years it costs $150 above IL Registered Agent.org, in exchange for more of the work done.

Price covers

  • A physical street address in the state
  • Any papers served on the company get scanned for you at no cost
  • Three government mailings a year are scanned at no cost to you
  • Also serves nonprofits, corporations, LPs and LLPs

Advantages

  • $149 each year with no increase
  • The same provider anywhere

Limitations

  • Higher by $50 a year
  • Reports remain the owner's job
Visit Mainstay Filing Partner link. We may earn money if you buy.

2. IL Registered Agent.org: best for LLCs based only in Illinois

Single-state plan
First year: $99. Second year: $99

The second recommendation, IL Registered Agent.org: $99 a year with no change at renewal, for an LLC that stays within the state.

Price covers

  • A physical address in Illinois
  • Served documents appear online

Advantages

  • A smaller yearly bill than Mainstay Filing
  • Price $99; renews at $99

Limitations

  • No help in other states
  • The Limited Liability Company Annual Report gets no assistance
Visit IL Registered Agent.org Partner link. We may earn money if you buy.

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

Single-state plan
First year: $99. Second year: $99

The third recommendation, Illinois Registered Agent.co: $99 a year with no change at renewal, for an LLC that stays within the state.

IL Registered Agent.org and this service cost the same.

Price covers

  • A physical address in Illinois
  • Served documents appear online

Advantages

  • Price $99; renews at $99
  • A smaller yearly bill than Mainstay Filing

Limitations

  • No help in other states
  • The Limited Liability Company Annual Report gets no assistance
Visit Illinois Registered Agent.co Partner link. We may earn money if you buy.

The services compared

#ServiceAnnual priceRenewal priceThree-year total
1 Mainstay Filing $149$149/yr$447 Visit Mainstay Filing Partner link. We may earn money if you buy.
2 IL Registered Agent.org $99$99/yr$297 Visit IL Registered Agent.org Partner link. We may earn money if you buy.
3 Illinois Registered Agent.co $99$99/yr$297 Visit Illinois Registered Agent.co Partner link. We may earn money if you buy.

Company prices as listed on November 13, 2026. No agent changes the state fees.

How a Illinois agent is set up

  1. Section 1

    Read the Illinois requirement

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

    Reference: ilga.gov, as published October 2026

  2. Section 2

    Who may take the role

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

  3. Section 3

    The registered office requirement

    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 hired service lists its own Illinois street address in place of yours.

  4. Section 4

    Acting personally or hiring

    An owner who meets the tests above may serve; hiring one of the recommended agents costs $99 to $149 a year.

  5. Section 5

    Name the agent in the filing

    The Articles of Organization (Form LLC-5.5) asks for the agent's name and address; the Illinois Secretary of State also accepts filings from LLCs that change agents.

    Reference: ilsos.gov, as published October 2026

  6. Section 6

    Track the recurring filing

    File the Limited Liability Company Annual Report on time ($75, before the first day of the entity's anniversary month) so the agent record remains correct.

    Reference: ilsos.gov, as published October 2026

Illinois agent costs

ItemWho is paidSum
Registered agent service Your chosen service$99 to $149 a year
From year two Your chosen service$99 to $149 a year
Limited Liability Company Annual Report Government$75 every year

State fees come from the official pages in the bibliography. Over three years they consist of the filing, two reports and, in a few states, a minimum tax.

Why Mainstay Filing is first

On chapters the price completes (30% of the ranking) came first, with next.

One agent for every state beat the single-state plan.

Illinois questions

May a Illinois LLC operate without a registered agent?

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

Can I be my own registered agent?

An owner may serve if eligible; the tests are in sections 2 and 3.

Can I change my registered agent later?

Yes. A replacement requires a change filing at the Illinois Secretary of State (section 5).

What does a registered agent cost in Illinois?

The listed agents run $99 to $149 per year.

What does the LLC pay the state each year?

Owners submit the Limited Liability Company Annual Report and pay $75 every year.

Which registered agent would you choose?

Mainstay Filing, because $149 a year from one provider, for this state and any later one. After it come IL Registered Agent.org and Illinois Registered Agent.co.

Next chapter

Bibliography and primary texts

  1. Primary text behind Illinois Secretary of State, Department of Business Services: ilsos.gov, accessed August 2026.
  2. Primary text behind Illinois Secretary of State, Department of Business Services: ilsos.gov, accessed August 2026.
  3. Primary text behind 805 ILCS 180/5-5: ilga.gov, accessed August 2026.
  4. Primary text behind Illinois formation fee: Filing fee, official source: ilga.gov, accessed October 2026.
  5. Primary text behind Illinois formation fee: Filing fee, official source: ilsos.gov, accessed October 2026.
  6. Primary text behind Illinois registered agent statute: ilga.gov, accessed October 2026.
  7. Prices quoted from the Illinois service page at Mainstay Filing on November 13, 2026
  8. Prices quoted from the pricing page at IL Registered Agent.org on November 13, 2026
  9. Prices quoted from the pricing page at Illinois Registered Agent.co on November 13, 2026