Illinois Form LLC-50.1 is the Statement of Change of Registered Agent and/or Registered Office that every Illinois limited liability company files with the Illinois Secretary of State to update the agent or office on record. The form lives on the Secretary of State LLC publications page, and the current revision printed on the bottom of the PDF is C 235.16 (Rev. Jan. 2024).
Filing this form on time keeps your LLC in good standing under the Illinois Limited Liability Company Act. Missing the update can trigger administrative dissolution by the Department of Business Services, and the Secretary of State’s office processes more than 40,000 registered agent changes each year, with roughly 1 in 8 paper filings rejected for a wrong address format or a missing signature.
In this guide you will learn:
- 📄 How to read every box on Form LLC-50.1 and what to write in each one.
- 🏠 How to list a valid Illinois registered office and avoid the P.O. Box trap.
- 💵 How to pay the $25 filing fee and choose between mail and online filing.
- 👩💼 How three real Illinois LLCs (Maria, Jamal, and the Patel siblings) filed the form start to finish.
- ⚖️ How to dodge the ten most common mistakes that lead to rejection or dissolution.
What the Form Is and Who Must File It
Form LLC-50.1 is the official Illinois document an LLC uses to change its registered agent, its registered office, or both. The Illinois Secretary of State’s Department of Business Services receives every filing, indexes it against the LLC’s file number, and updates the public record within five to ten business days for paper filings.
Every Illinois LLC and every foreign LLC authorized to transact business in Illinois must keep a registered agent and a registered office under 805 ILCS 180/1-35. When the agent resigns, dies, moves, or is replaced, the LLC has 60 days to file LLC-50.1. The consequence of ignoring the rule is administrative dissolution under 805 ILCS 180/35-25, which strips the LLC of its right to sue in Illinois courts.
The form is not the right tool when the agent themselves wants to resign without a successor; that filing is the Statement of Resignation of Registered Agent (LLC-1.36/1.37). LLC-50.1 is also not used to change the LLC’s principal place of business, which is updated on the Annual Report, Form LLC-50.
Before You Start: Documents and Information You Need
Gathering the right paperwork before you open the PDF prevents the most common rejection reasons. The Department of Business Services rejects filings that do not match the exact LLC name on record, so cross-check every detail against your existing file with the Business Services Database.
Pull these eight items together before you start:
- Your LLC file number, a six- or seven-digit number issued at formation, because the Secretary of State indexes every filing by file number, not by name.
- The exact legal name of the LLC, including the words LLC or L.L.C., because a missing comma will cause an automatic kick-back.
- The full legal name of the new registered agent, individual or commercial, because the agent’s name must match the name on file with the Secretary of State if it is a commercial agent.
- The Illinois street address of the new registered office, because 805 ILCS 180/1-35(a) bars P.O. boxes and out-of-state addresses.
- The county in which that street address sits, because the form has a separate county box and a wrong county delays processing.
- A signed Acceptance of Appointment from the new agent if you use a commercial service, because most agents will not appear on file without one.
- A check or credit card for the $25 filing fee, because the fee is non-refundable and must clear before the change posts.
- The name and title of the manager or member who will sign, because an unauthorized signer voids the filing.
If any item is missing, the Department mails a rejection letter to the old address on file, which is dangerous when the move is the very thing you are trying to fix.
Where to Get the Form and How to Access It
The current PDF lives on the Illinois Secretary of State’s LLC publications page under Forms – Limited Liability Company. Download it as form-llc-501.pdf, open it in Adobe Acrobat Reader, and confirm the revision marker C 235.16 sits on the bottom-left corner.
Browser-based PDF viewers sometimes drop typed entries when you save, so always use the desktop Acrobat Reader. The form is also available in person at the Howlett Building, 501 S. Second Street, Room 350, Springfield, IL 62756, and at the Chicago office at 115 S. LaSalle Street, Suite 300.
You may file online for most domestic LLCs through the Illinois Secretary of State Business Services Portal. The portal walks you through the same fields and charges the same $25 fee but skips the mail delay. Foreign LLCs and series LLCs sometimes cannot use the portal and must file on paper.
The form is two pages: page one is the data block, and page two is the signature and instructions. Print on plain white 8.5 x 11 paper if you mail it, because colored paper and double-sided printing both trigger imaging errors.
Step-by-Step: How to Fill Out Form LLC-50.1 Line by Line
Every box on LLC-50.1 has a purpose, and skipping or mis-formatting even one will pull your filing into the rejection queue. Work top to bottom, type your entries (handwriting is allowed but slows imaging), and use ALL CAPS for names and addresses to match the Secretary of State’s data standard.
Box 1: Limited Liability Company Name
This box asks for the exact legal name of your LLC as it appears on the Articles of Organization. Type it in ALL CAPS, include the punctuation, and include LLC or L.L.C. exactly as registered. Maria Lopez writes MARIA LOPEZ CONSULTING, LLC because that is how the name appears on her LLC-5.5.
If your LLC operates under an assumed name, do not enter the assumed name here; the assumed name lives on Form LLC-1.20. The most common mistake is dropping the comma before LLC, which produces a name mismatch and a rejection letter, costing two to three weeks. Filers sometimes believe a small typo will be corrected by clerks, but Department staff do not edit filings; they reject them.
Box 2: File Number
The file number is the six- or seven-digit number the Secretary of State assigned when the LLC was formed. Look it up on the Business Services Database and type it without dashes or spaces. Jamal Carter writes 0123456-7 because the database lists his LLC that way.
If the LLC has a hyphenated number (older filings), include the hyphen exactly as shown. The most common mistake is transposing two digits, which routes the filing to the wrong LLC’s record and triggers a rejection. A common misconception is that the FEIN can substitute for the file number; it cannot, because the Secretary of State indexes only by state file number.
Box 3: Current Registered Agent
This field captures the agent currently on the public record, not the new one. Pull the name from the Business Services Database and type it exactly. Maria writes CT CORPORATION SYSTEM because that string is what shows under her current agent.
If the current agent’s name has changed (for example, a marriage), still enter the name on file, not the new legal name. The most common mistake is entering the new agent’s name in this box, which scrambles the change request and forces a refile. Filers sometimes assume Box 3 is the new agent because they read top to bottom; it is not, and the form’s instructions on page two confirm this.
Box 4: Current Registered Office
Box 4 is the street address currently on file for the registered office, including suite number, city, ZIP, and county. Match it character-for-character to the database entry, even if the address is outdated, because the Department compares this box to its records before posting the change. Jamal writes 208 S LASALLE ST STE 814, CHICAGO, IL 60604, COOK COUNTY.
If the existing record lists an old ZIP+4, use it; the Department will not accept close enough. The most common mistake is updating the address here instead of in Box 6, which means the filing changes nothing on the public record. A common misconception is that the county can be skipped; the county field is mandatory and a blank entry kicks the filing back.
Box 5: New Registered Agent
This is the new agent’s full legal name, individual or entity. Use the agent’s exact registered name, and if you are using a commercial agent, copy the name from the agent’s own listing in the Business Services Database. The Patel siblings write NORTHWEST REGISTERED AGENT LLC.
If you appoint yourself as agent, write your full legal name (no nicknames, no initials), because a name mismatch with state ID will cause downstream service-of-process problems. The most common mistake is using an abbreviated form (e.g., NW Registered Agent) that does not match the database, leading to rejection. Filers sometimes believe the new agent does not have to consent; in practice, an agent who refuses service can resign at any time and leave you scrambling.
Box 6: New Registered Office
Box 6 demands an Illinois street address for the new registered office, including suite, city, ZIP, and county. P.O. boxes are forbidden under 805 ILCS 180/1-35(a)(2), and the address must be a place where the agent is physically available during business hours. Maria writes 4501 N RAVENSWOOD AVE, CHICAGO, IL 60640, COOK COUNTY.
If your registered agent is a commercial service, use that service’s Illinois street address; do not use your own home address. The most common mistake is listing a P.O. Box or a UPS Store mailbox, which is rejected on sight and costs the $25 fee plus another two weeks. A common misconception is that the new office must match the LLC’s principal place of business; it need not, because the registered office is only the address for service of process.
Box 6a: County of New Registered Office
The county box is a separate line and asks for the Illinois county where the new street address sits. Type the county name in full, without the word County. Jamal writes COOK because his new office is in Chicago.
If the address is in a town that straddles two counties, use the county the U.S. Postal Service uses for that ZIP. The most common mistake is leaving this blank or writing a city name (Chicago), which the Department’s automated check flags. Filers sometimes think the county is decorative; it is statutorily required and a blank entry voids the filing.
Box 7: Statement of Change Type
LLC-50.1 lets you check one of three boxes: agent only, office only, or both. Tick exactly one box that matches what you are actually changing, because checking the wrong combination overwrites correct data with stale data. The Patel siblings tick “BOTH the registered agent and the registered office”.
If you are changing one and the other stays the same, you still must enter the unchanged data correctly in Boxes 5 and 6, because the form treats each filing as a full overwrite. The most common mistake is checking both when only the agent changed, which can overwrite the office address with whatever you typed in Box 6. A common misconception is that checking both is safer; it is not, because it forces you to retype data that did not change.
Box 8: Effective Date
You may leave this blank to make the change effective on the filing date, or enter a future date up to 60 days out. Use the format MM/DD/YYYY. Maria writes 06/01/2026.
If you back-date the field, the Department will reject it because back-dating is prohibited. The most common mistake is entering a date more than 60 days in the future, which violates 805 ILCS 180/5-45 and triggers a rejection. Filers sometimes assume the effective date is the postmark date; it is the date the Department processes the filing unless you specify otherwise.
Box 9: Signature and Title
A manager (manager-managed LLC) or a member (member-managed LLC) must sign and date this box and enter their title. The Department compares the title to the LLC’s last filed Annual Report. Jamal signs as JAMAL CARTER, MANAGER.
If an attorney signs on behalf of the LLC, the attorney must include the phrase Authorized Person and attach a signed authorization. The most common mistake is signing without a title, which voids the filing under the Secretary of State’s signature standard. A common misconception is that any owner can sign; in a manager-managed LLC, only a manager has signing authority for state filings.
Box 10: Name and Address of Person Filing
This block tells the Secretary of State where to mail the file-stamped copy and any rejection letter. Use a current address you actually monitor, because rejection letters that bounce add weeks to the cure period. The Patel siblings write PRIYA PATEL, 1212 W BELMONT AVE, CHICAGO, IL 60657.
If you are using a filing service, list the service’s address so they can forward the file-stamped copy. The most common mistake is using the old registered office address, which defeats the purpose of the change. A common misconception is that this box is optional; the Department will not mail proof of filing without it.
Three Filled-Out Examples Using Real Scenarios
The three scenarios below show how three different Illinois LLCs use LLC-50.1. Each row pairs the form section with the exact entry the filer makes.
Scenario 1: Maria Lopez switches from a commercial agent to herself
Maria runs Maria Lopez Consulting, LLC, a single-member marketing firm in Chicago. She has been paying $129 per year to CT Corporation System and wants to act as her own agent at her office on Ravenswood Avenue.
| Form Section | What Maria Enters |
|---|---|
| Box 1: LLC Name | MARIA LOPEZ CONSULTING, LLC |
| Box 2: File Number | 0789012-3 |
| Box 3: Current Agent | CT CORPORATION SYSTEM |
| Box 4: Current Office | 208 S LASALLE ST STE 814, CHICAGO, IL 60604, COOK COUNTY |
| Box 5: New Agent | MARIA LOPEZ |
| Box 6: New Office | 4501 N RAVENSWOOD AVE, CHICAGO, IL 60640 |
| Box 6a: County | COOK |
| Box 7: Change Type | BOTH agent and office |
| Box 8: Effective Date | 06/01/2026 |
| Box 9: Signature | MARIA LOPEZ, SOLE MEMBER |
Scenario 2: Jamal Carter moves the office, keeps the same agent
Jamal manages Carter Logistics IL, LLC, a manager-managed trucking outfit. The LLC’s registered agent (Jamal himself) is staying, but the office is moving from a LaSalle Street suite to a warehouse on Pulaski Road.
| Form Section | What Jamal Enters |
|---|---|
| Box 1: LLC Name | CARTER LOGISTICS IL, LLC |
| Box 2: File Number | 0654321-9 |
| Box 3: Current Agent | JAMAL CARTER |
| Box 4: Current Office | 208 S LASALLE ST STE 814, CHICAGO, IL 60604, COOK COUNTY |
| Box 5: New Agent | JAMAL CARTER |
| Box 6: New Office | 3401 S PULASKI RD, CHICAGO, IL 60623 |
| Box 6a: County | COOK |
| Box 7: Change Type | Registered OFFICE only |
| Box 9: Signature | JAMAL CARTER, MANAGER |
| Box 10: Filer | JAMAL CARTER, 3401 S PULASKI RD, CHICAGO, IL 60623 |
Scenario 3: The Patel siblings hire a commercial agent after a resignation
Priya and Raj Patel co-own Patel Family Holdings, LLC. Their previous individual agent resigned, and they want to hire Northwest Registered Agent LLC and use that agent’s Illinois street address.
| Form Section | What the Patels Enter |
|---|---|
| Box 1: LLC Name | PATEL FAMILY HOLDINGS, LLC |
| Box 2: File Number | 0445566-1 |
| Box 3: Current Agent | RAJ PATEL |
| Box 4: Current Office | 1212 W BELMONT AVE, CHICAGO, IL 60657, COOK COUNTY |
| Box 5: New Agent | NORTHWEST REGISTERED AGENT LLC |
| Box 6: New Office | 100 W RANDOLPH ST STE 500, CHICAGO, IL 60601 |
| Box 6a: County | COOK |
| Box 7: Change Type | BOTH agent and office |
| Box 8: Effective Date | (blank, effective on filing) |
| Box 9: Signature | PRIYA PATEL, MEMBER |
| Box 10: Filer | PRIYA PATEL, 1212 W BELMONT AVE, CHICAGO, IL 60657 |
How to File the Completed Form
Illinois accepts LLC-50.1 by mail, in person, or online for most domestic LLCs. Pick the channel that matches your urgency and your LLC type, and keep proof of filing for at least three years.
By mail. Send the signed original and a $25 check payable to Secretary of State to the Department of Business Services, Limited Liability Division, 501 S. Second Street, Room 351, Springfield, IL 62756. Processing takes 10 business days from receipt, and you should keep the certified-mail green card as proof of filing.
In person. Walk the form into the Springfield office or the Chicago office at 115 S. LaSalle Street, Suite 300. Same-day service is available for an extra $50 expedite fee, payable by cash, check, money order, or credit card.
Online. Use the Business Services Portal for domestic LLCs. The portal accepts Visa, MasterCard, Discover, and American Express, charges the same $25 base fee plus a small credit-card surcharge, and posts the change within one business day. Save the PDF receipt the portal emails you, because that email is your proof of filing.
By fax. Illinois does not accept LLC-50.1 by fax, so do not attempt a fax filing.
What Happens After You File
Once the Department of Business Services accepts the form, it updates the public record, and the new agent and office appear on the Business Services Database within one to ten business days depending on channel. Mail filers receive a file-stamped copy back at the address in Box 10.
If the filing is rejected, the Department mails a kick-back letter that explains the defect and returns your fee or holds it pending correction. You have 30 days to cure most defects without losing the original effective date, but if you miss that window the LLC may slip into not in good standing status. Persistent failure to maintain a registered agent leads to administrative dissolution under 805 ILCS 180/35-25, and reinstatement costs $200 plus all past-due annual report fees.
You should also notify your bank, your insurance carrier, and any contracting parties of the new address, because lawsuits and tax notices follow the registered office. Setting a calendar reminder to confirm the change posted on the public database within two weeks is a low-cost way to catch silent rejections.
Mistakes to Avoid When Filling Out the Form
Each error below has a direct consequence in the Department’s queue. Reading this list before you sign saves the $25 refile fee and the two-week delay.
- Listing a P.O. Box in Box 6, which is rejected on sight under 805 ILCS 180/1-35.
- Using a UPS Store or virtual-office mailbox, which counts as a P.O. Box and is rejected.
- Leaving the county field blank, which causes an automated kick-back.
- Entering the new agent in Box 3, which scrambles the change and forces a refile.
- Forgetting to check a box in Box 7, which leaves the Department guessing and triggers rejection.
- Signing without a title, which voids the form under the Secretary of State’s signature standard.
- Using a member’s signature on a manager-managed LLC, which the Department rejects as unauthorized.
- Sending a personal check that bounces, which voids the entire filing and adds a $25 NSF fee.
- Mailing the form to the Chicago office address by mistake, which adds five business days as the office forwards it to Springfield.
- Entering an effective date more than 60 days out, which violates the statute and is rejected.
- Forgetting to update the LLC’s bank and insurance records after filing, which leaves service of process going to the wrong address.
- Filing LLC-50.1 when the agent has resigned with no successor, which is the wrong form (use LLC-1.36/1.37).
Dos and Don’ts
These rules tighten your filing and shrink the rejection risk to near zero.
- Do download the form fresh each time, because the Department updates the revision marker without notice.
- Do verify the new agent’s consent in writing before listing them, because an unwilling agent can resign immediately.
- Do match every name and address character-for-character to the Business Services Database, because the Department’s check is exact.
- Do keep the file-stamped copy for at least three years, because banks ask for it during account updates.
- Do calendar a 14-day check on the public record, because silent rejections are common.
- Do file online when possible, because portal filings post in one business day instead of ten.
- Don’t use a P.O. Box, because the statute forbids it and the rejection is automatic.
- Don’t back-date the effective date, because the Department rejects any date earlier than the filing date.
- Don’t list a residential address you do not actually staff, because process servers must find someone there during business hours.
- Don’t ignore a rejection letter, because the 30-day cure window passes quickly.
- Don’t pay with a starter check, because the Department often rejects unprinted checks.
- Don’t file LLC-50.1 to update the principal place of business, because that change belongs on the Annual Report (Form LLC-50).
Pros and Cons of Filing on Your Own vs. With Help
Most single-member LLCs can file LLC-50.1 without professional help, but multi-member or series LLCs sometimes benefit from a paid filer.
Pros of filing pro se.
- You save the $50 to $200 a paralegal or filing service charges.
- You keep direct control over the timing and the addresses on file.
- You learn the Department’s process for future filings.
- You avoid sharing personal data with a third party.
- You can use the Business Services Portal for a one-business-day turnaround.
Cons of filing pro se.
- You bear the rejection risk if you misformat a field.
- You must monitor the cure window without help.
- You take on the agent’s service-of-process duties if you appoint yourself.
- You may miss interaction effects with the Annual Report or Articles.
- You will not get attorney-client privilege if a dispute arises later.
A commercial registered agent service typically bundles LLC-50.1 filing into a $99 to $300 yearly fee, which can be a fair trade for LLCs with out-of-state owners or sensitive litigation exposure.
Key Entities, Related Forms, and Comparison Tables
LLC-50.1 sits in a small family of Illinois LLC forms, and knowing the neighbors prevents misfiling.
| LLC-50.1 vs. LLC-1.36/1.37 | Difference |
|---|---|
| LLC-50.1 | LLC files to appoint a new agent or office. |
| LLC-1.36/1.37 | Agent files to resign with or without a successor. |
| Mail Filing vs. Online Filing | Difference |
|---|---|
| $25 fee, 10 business days, paper file-stamp returned. | |
| Online | $25 fee plus card surcharge, 1 business day, PDF receipt emailed. |
| Commercial vs. Individual Registered Agent | Difference |
|---|---|
| Commercial | Statewide street address, $99-$300/year, privacy shield. |
| Individual | No annual fee, must be available at the office during business hours. |
The Illinois Secretary of State, the Department of Business Services, the Illinois LLC Act (805 ILCS 180), and the Annual Report (Form LLC-50) all interact with this filing. The Secretary of State enforces the statute, the Department processes the form, the Act sets the registered-agent rule, and the Annual Report carries the LLC’s principal office (separate from the registered office).
Recap of Agency Decisions That Shape This Filing
The Department’s 2019 administrative bulletin on registered office addresses confirmed that virtual-office mailboxes, including UPS Store and iPostal1 boxes, do not satisfy 805 ILCS 180/1-35. The Illinois Appellate Court’s decision in Relax Inc. v. Heartland Bank clarified that service of process on a stale registered office is still effective if the LLC failed to update LLC-50.1, which puts the burden squarely on the LLC.
The Secretary of State’s 2022 fee schedule held the LLC-50.1 fee at $25 while raising other LLC fees, so do not assume the fee has changed without checking the LLC publications page. The expedite fee for in-person filings rose to $50 in 2023.
FAQs
Do I have to file LLC-50.1 if only my agent’s email changed?
No. The form updates the agent’s name and the registered office street address only; email and phone are not on the public record, so no filing is needed for those changes.
Can my registered office be my home in Illinois?
Yes. A home street address is allowed if you are physically available during business hours, but it becomes a public record visible to anyone searching the database.
Do I write my maiden name or married name in Box 5?
Yes, use the legal name that matches your government-issued ID, because process servers will compare the form to your ID when delivering papers.
What if I have a P.O. Box and no street address?
No, P.O. Boxes are barred by 805 ILCS 180/1-35; you must use a physical Illinois street address or hire a commercial agent who has one.
Is the $25 fee refundable if my filing is rejected?
No. The Department keeps the fee even on rejection, although a corrected filing within 30 days does not require a second $25 payment.
Can I sign LLC-50.1 electronically through the portal?
Yes. The Business Services Portal accepts a typed e-signature that meets the Illinois Uniform Electronic Transactions Act standard.
Do I need to file a new Annual Report after filing LLC-50.1?
No. LLC-50.1 updates the registered agent and office immediately, and your next Annual Report (Form LLC-50) will reflect the change automatically.
What if my LLC is a series LLC?
Yes, you can file LLC-50.1 for the master series, but each protected series with its own agent must file a separate LLC-50.1 referencing the series file number.
Can a member sign in a manager-managed LLC?
No. Only a manager has authority for state filings in a manager-managed LLC, and a member’s signature will be rejected as unauthorized.
What if the new agent has the same name as an existing entity?
Yes, identical names are allowed for individuals, but for entity agents the name must match the agent’s own filing in the Business Services Database exactly.
Does Box 8 (Effective Date) accept a past date?
No. Back-dating is prohibited; you may use the filing date or any date up to 60 days in the future, per 805 ILCS 180/5-45.
How fast does the public database update after I file online?
Yes, the public database typically refreshes within one business day for portal filings, and within 10 business days for paper filings mailed to Springfield.
What happens if I never file LLC-50.1 after my agent resigns?
No good outcomes follow; the LLC drifts out of good standing, loses the ability to sue in Illinois courts, and faces administrative dissolution under 805 ILCS 180/35-25.
Can I use the same form to change the LLC’s name?
No. A name change requires Articles of Amendment (Form LLC-5.25), not LLC-50.1, and the fee is different.
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