LLC Registered-Agent and Registered-Office Requirements in Illinois

At a glance

Requirements one by one

Governing law and terminology

805 ILCS 180/1-1 names the statute the Limited Liability Company Act. Section 1-5 defines a registered agent as the company-appointed person who receives service of process and defines the registered office as the Illinois address on file where process, notice, or demand may be served on that agent.

Continuous designation duty

Under 805 ILCS 180/1-35(a), every Illinois LLC must “continuously maintain in this State a registered agent and registered office.” Section 5-5(a)(3) makes the initial appointment part of formation by requiring the articles to state the agent's name and the office address.

Eligible individual

Section 1-35(a) permits an “individual resident of this State.” It does not state a minimum age or citizenship requirement. Illinois residence is the individual qualification the Act names.

Eligible entity and self-service

The entity alternative in § 1-35(a) is another “person authorized to transact business in this State.” The Secretary of State's current guide says an organizer, manager, member, or employee may serve, but only if that person independently meets the qualification.

The Secretary's March 2026 change form is explicit that the LLC may not act as its own registered agent. Naming a member or employee and naming the LLC itself are legally different choices.

Registered office, address, and hours

Sections 1-36(b)(6) and 1-37(a)(5) require the registered-office address and the agent's business-office address to be identical. The Secretary's guide requires an Illinois street or road address, or a rural route and box number. A P.O. box alone is rejected, although the current change form says a P.O. box with the plus-4 ZIP may be added to the physical address.

The Act and current Secretary materials state no fixed daily availability hours. The legal requirement is the qualifying Illinois business-office address where the agent receives service, not a separately enacted nine-to-five window.

Consent and initial filing

Section 5-5(a)(3) requires the articles to state the agent and office. Under § 5-45(b)(1), the organizer signs the initial articles. Neither provision nor official Form LLC-5.5 supplies a separate agent signature or acceptance filing.

That does not make an unwilling appointment proper. The Secretary's formation guide says an LLC should name someone only after that person has agreed to act. The agreement is advised before filing, but it is not a separate filed acceptance under the current Act or form.

Change, resignation, and replacement

Under § 1-36, the LLC files a statement naming the current and successor agent or office, confirms the office remains identical to the agent's business office, and states that members or managers authorized the change. Section 5-45(b)(3) lets a person authorized by the LLC sign. The change becomes effective when the Secretary of State files the statement.

Section 1-37 separately lets the registered agent sign and file an office-only address change, also effective on filing. An agent resignation follows three different clocks under § 1-35(c)–(d): the agent mails the LLC a copy by registered or certified mail at least 10 days before filing; the resignation cannot take effect sooner than 30 days after filing; and a new agent must be placed on record within 60 days after the resignation notice.

Agent duties and service

Section 1-5 makes accepting service of process the agent's statutory role. The Secretary's guide adds the ordinary filing-system function: official Secretary-of-State correspondence is sent to the agent at the registered office. Section 1-50(a) therefore directs process to the appointed agent unless the statutory Secretary-of-State route applies.

Lapse consequences and fallback service

Section 50-15(a)(2) makes an LLC delinquent and not in good standing when it does not replace a resigning agent within 60 days. The current change form states the $100 penalty, while § 50-15(b)(2) blocks additional company filings until the delinquency is cured.

Failure to appoint and maintain the agent is an administrative-dissolution ground under § 35-25(3). After the Secretary sends a delinquency notice, § 35-30(b) gives 60 days to correct that ground before the Secretary issues a certificate of dissolution; the dissolved LLC then continues only to wind up.

The lapse does not prevent service. Section 1-50(b) irrevocably appoints the Secretary of State when the LLC has no maintained agent or when the agent cannot with reasonable diligence be found at the registered office or stated principal place of business. Under § 1-50(c), the claimant serves the Secretary, mails the papers by registered or certified mail both to the last registered office and to the address most likely to give actual notice after reasonable inquiry, and attaches an affidavit of compliance.

What trips people up

The LLC itself and an LLC insider are not the same agent choice. The company may not name itself, but a resident organizer, manager, member, or employee may serve in the person's own name.

A mailbox cannot replace the office. A P.O. box may accompany the physical address in the limited manner the Secretary's form describes, but it cannot be the only registered-office address.

Resignation has three clocks, not one. Mailing occurs at least 10 days before filing, resignation takes effect no sooner than 30 days after filing, and the company has 60 days after the notice to place a successor on record.

Common questions

Must the organizer also be the registered agent? No. The form treats the organizer and agent as separate roles, although a qualified organizer may hold both.

Does the agent sign the articles? Not in a separate agent capacity. The organizer signs Form LLC-5.5; the form has no agent-acceptance signature block.

Is Secretary-of-State fallback automatic after an agent lapse? The appointment is statutory, but the serving party must complete § 1-50(c)'s service, dual-mailing, fee, and affidavit steps.

Statutes and sources

• 805 ILCS 180/1-1, 1-5, and 1-35 — Act name, agent and office definitions, continuous duty, eligibility, resignation notice, effective date, and replacement period. https://www.ilga.gov/documents/legislation/ilcs/documents/080501800K1-35.htm (accessed 2026-07-27)
• 805 ILCS 180/1-36, 1-37, and 5-45 — company and agent change filings, identical business-office rule, signers, and filing effectiveness. https://www.ilga.gov/documents/legislation/ilcs/documents/080501800K1-36.htm (accessed 2026-07-27)
• 805 ILCS 180/5-5 and 1-50 — formation-filing contents and direct or Secretary-of-State service routes. https://www.ilga.gov/documents/legislation/ilcs/documents/080501800K1-50.htm (accessed 2026-07-27)
• 805 ILCS 180/50-15, 35-25, and 35-30 — delinquency, loss of good standing, filing block, administrative-dissolution ground, notice, and cure period. https://www.ilga.gov/documents/legislation/ilcs/documents/080501800K35-30.htm (accessed 2026-07-27)
• Illinois Secretary of State domestic LLC guide and forms LLC-5.5, LLC-1.35, and LLC-1.36/1.37 — live filing fields, insider eligibility, agreement guidance, physical-address rule, self-agent exclusion, resignation, and change instructions. https://www.ilsos.gov/publications/pdf_publications/c334.pdf (accessed 2026-07-27)
• IL HB 4341 and SB 2816 bill pages — current companion-bill text and live re-referral histories for the proposed principal-office-address route. https://ilga.gov/Legislation/BillStatus?DocNum=4341&GAID=18&DocTypeID=HB&LegId=164871&SessionID=114 (checked 2026-09-09)