Illinois Business Entity Search 2026: Complete Guide to Looking Up IL Companies
The Illinois Secretary of State maintains the Cyberdrive database at ilsos.gov/corporatellc — the official portal for searching all Illinois-registered LLCs, corporations, limited partnerships, and other business entities. This guide covers every step of the search process, all entity status codes, Illinois filing fees (LLC: $150, Corporation: $150, LP: $100), annual report deadlines (LLCs and corps: before April 1, $75 fee), and how Illinois compares to Wisconsin, Indiana, Missouri, and Iowa.
Illinois Business Entity Search 2026 — At a Glance
- Official portal: ilsos.gov/corporatellc (Cyberdrive)
- Search by: Name, File Number, Entity Type
- Cost to search: Free (no account required)
- LLC formation fee: $150
- Corporation formation fee: $150
- LP formation fee: $100
- Expedited (24-hour): +$100 additional fee
- LLC annual report: $75, due before April 1 each year
- Corporation annual report: $75, due before April 1
- Certificate of Good Standing: $25
- Reinstatement fee (LLC): $100 + back annual reports
- State income tax: 4.95% flat rate
- FEIN requirement: Required for all IL entities
- Filing authority: Illinois Secretary of State (ILSOS)
1. Step-by-Step: How to Search Illinois Business Entities
Follow these 7 steps to find any Illinois business entity using the official Illinois Secretary of State Cyberdrive portal:
Navigate to the Illinois SOS Cyberdrive Portal
Go to https://www.ilsos.gov/corporatellc in your web browser. This is the official Illinois Secretary of State business entity search system (Cyberdrive database). It is free, requires no login or account, and is available 24/7. The search covers all Illinois-registered LLCs, corporations, limited partnerships, and other business entities.
Choose Your Search Method
The Cyberdrive portal offers two search methods: (1) Entity Name Search - enter the business name or partial name; (2) File Number Search - enter the Illinois Secretary of State file number (a 7-or-8 digit alphanumeric identifier). Name search is most commonly used. You can also filter by entity type (LLC, Corporation, LP, etc.).
Enter Your Search Term
For entity name searches, you can enter the full name or a partial name. The system returns entities whose names start with or contain your search term. Do NOT include 'LLC,' 'Inc.,' or 'Corp.' in your search - the system strips entity designators. Searches are not case-sensitive. Partial names work well for common business names.
Review the Search Results List
Results display in a table showing: File Number, Entity Name, Entity Type (LLC, Corporation, LP, etc.), Status (Active, Not Good Standing, Dissolved, Revoked), State of Organization, and Date Filed. Click any column header to sort. Use the File Number and formation date to identify the correct entity when multiple similar names appear.
Open the Entity Detail Page
Click the entity's file number or name to open the Entity Detail page. This shows: entity name, file number, entity type, status, state of organization, date of organization, dissolution date (if applicable), registered agent name and IL address, and names/addresses of managers/members (LLCs) or officers/directors (corporations).
Download Filed Documents
Some Illinois entity documents are available for free download from the Cyberdrive portal, including Articles of Organization or Incorporation and some amendments. Click 'View Documents' on the Entity Detail page. Certified copies can be ordered through the Illinois SOS for a fee ($5 per certification plus copy fees).
Order a Certificate of Good Standing
If you need official proof that an Illinois entity is in good standing - for a bank loan, contract, or legal proceeding - order a Certificate of Good Standing from the Illinois Secretary of State. Fee: $25 (standard). Processing: 7-10 business days; expedited 24-hour service: +$100. The certificate confirms Active status and current filings.
Pro tip: If you know the entity's Illinois file number (shown on any previous filing, correspondence, or contract), use file number search for an exact, unambiguous result. Illinois file numbers are unique permanent identifiers that never change even if the entity's name changes.
2. Illinois Entity Types and Filing Fees 2026
Illinois has several entity types available for business formation. The table below shows all entity types, their formation filing fees, annual report fees, and key characteristics:
| Entity Type | Formation Fee | Annual Report | Expedited (24hr) | Notes |
|---|---|---|---|---|
| LLC (Limited Liability Company) | $150 | $75 (before April 1) | +$100 (24hr) | Most common entity type; flexible governance; pass-through taxation |
| Corporation (Stock) | $150 | $75 (before April 1) | +$100 (24hr) | C-corp structure; can elect S-corp status; issued shares required |
| Not-for-Profit Corporation | $50 | $10 (before November 1) | +$100 (24hr) | 501(c)(3) and other nonprofit entities |
| Limited Partnership (LP) | $100 | $100 (before June 1) | +$100 (24hr) | Requires at least one general partner and one limited partner |
| Limited Liability Partnership (LLP) | $100 | $100 (before June 1) | +$100 (24hr) | Common for law firms, accounting firms, and professional practices |
| Professional Service Corporation (PC) | $150 | $75 (before April 1) | +$100 (24hr) | For licensed professionals: doctors, lawyers, accountants |
| Foreign LLC (out-of-state LLC) | $150 | $75 (before April 1) | +$100 (24hr) | LLCs formed outside Illinois registering to do business in IL |
| Foreign Corporation (out-of-state Corp) | $175 | $75 (before April 1) | +$100 (24hr) | Corporations formed outside Illinois registering to do business in IL |
Illinois FEIN requirement: All Illinois business entities must obtain a Federal Employer Identification Number (FEIN/EIN) from the IRS before conducting business. The EIN is free at IRS.gov and issued immediately online. It is required for opening Illinois business bank accounts, filing Illinois tax returns (Form IL-1065 for LLCs, Form IL-1120 for corporations), and the Illinois LLC formation process.
3. Illinois Entity Status Codes Explained
The "Status" field in Illinois Cyberdrive search results tells you whether a business entity is currently authorized to conduct business in Illinois. Understanding these codes is essential for due diligence:
Entity is in good standing and authorized to conduct business in Illinois. All required annual reports are current.
Can conduct business in Illinois: Yes
Entity has an overdue annual report or unpaid fees but has not yet been dissolved or revoked. Non-compliant but can still technically operate.
Can conduct business in Illinois: Technically yes, but non-compliant
Entity was voluntarily dissolved by its owners through a formal dissolution filing with the Illinois SOS.
Can conduct business in Illinois: No
Entity was dissolved by the Illinois Secretary of State for failure to file annual reports or pay required fees.
Can conduct business in Illinois: No
Applies to corporations. The corporation's authority to transact business in Illinois has been revoked by the SOS for non-compliance.
Can conduct business in Illinois: No
Foreign entity (LLC or corporation formed outside Illinois) has officially withdrawn its registration to do business in Illinois.
Can conduct business in Illinois: No (in Illinois)
| Status | Can Do Business? | Reinstateable? | How to Fix |
|---|---|---|---|
| Active | Yes | N/A | No action needed |
| Not Good Standing | Technically, but non-compliant | Yes (no formal reinstatement needed) | File past-due annual report + pay $75 fee |
| Dissolved (Administrative) | No | Yes | File Form LLC-35.40 + $100 fee + all back annual reports |
| Dissolved (Voluntary) | No | No | Must form a new entity; cannot reinstate voluntary dissolution |
| Revoked (Corporation) | No | Yes | File Form Corp 12.45 + $100 fee + all back reports + franchise taxes |
| Withdrawn (Foreign Entity) | No (in IL) | Yes (re-register) | File new Application for Authority to re-qualify in Illinois |
Due diligence tip: Always verify a business entity's status before signing contracts, making payments, or entering business relationships. An entity in "Not Good Standing," "Dissolved," or "Revoked" status may not have legal authority to enter contracts in Illinois. Use the Illinois Cyberdrive portal to get real-time status information.
4. Illinois Annual Report Requirements 2026
Illinois requires most business entities to file annual reports with the Secretary of State. Here is everything you need to know about Illinois annual report requirements in 2026:
| Requirement | Illinois LLCs | Illinois Corporations | Illinois LPs/LLPs |
|---|---|---|---|
| Annual report required? | Yes | Yes | Yes |
| Filing fee | $75 | $75 | $100 |
| Due date | Before April 1 each year | Before April 1 each year | Before June 1 each year |
| Late penalty | Not Good Standing status | Not Good Standing status | Not Good Standing status |
| Extended non-compliance | Administrative dissolution | Revocation of charter | Administrative dissolution |
| What to include | Manager/member info, registered agent, principal address | Officer/director info, registered agent, shares issued | Partner info, registered agent, principal office |
| Where to file | ilsos.gov/business (online) | ilsos.gov/business (online) | ilsos.gov/business (online) |
| Certificate of Good Standing? | Yes ($25) | Yes ($25) | Yes ($25) |
Illinois Annual Report: Key Facts
- Due date: Before April 1 of each year (most entity types). Not April 1 — before April 1
- First annual report: Due the April 1 following your first full year of existence
- Filing method: Online at ilsos.gov/business (preferred) or by mail to the Illinois Secretary of State office in Springfield, IL
- What triggers Not Good Standing: Missing the April 1 deadline, even by one day
- What triggers administrative dissolution: Failure to file for 2+ consecutive years (exact threshold varies)
- Annual report ≠ tax return: The annual report ($75 to IL SOS) is separate from Illinois income tax returns (filed with Illinois Department of Revenue) and federal returns (filed with IRS)
5. Illinois Reinstatement Process
If your Illinois entity has been placed in "Not Good Standing," administratively dissolved, or revoked, you can reinstate it. The process and cost depend on the severity of the non-compliance:
| Current Status | Action Required | Total Cost | Processing Notes |
|---|---|---|---|
| Not Good Standing (overdue annual report) | File past-due annual report | $75 per missed year | File via ilsos.gov; entity returns to Active status upon acceptance |
| Administrative Dissolution (LLC) | File Form LLC-35.40 (Application for Reinstatement) | $100 reinstatement fee + $75/yr missed annual reports | Must file all missed annual reports; IL SOS processes in 3-5 business days |
| Revocation (Corporation) | File Application for Restoration (Form Corp 12.45) | $100 restoration fee + back annual reports + back franchise taxes | Corporation's original file number and formation date are preserved upon restoration |
| Voluntary Dissolution | Cannot reinstate; form a new entity | New formation fee ($150) | Once voluntarily dissolved, must form a new entity with a new file number and date |
Cost-benefit analysis: If your Illinois LLC has been administratively dissolved for multiple years, calculate the total reinstatement cost ($100 fee + $75 per missed year). For 3 missed years, that's $325. If reinstatement cost approaches $500+, it may be more practical to dissolve the old entity and form a new one ($150). However, reinstatement preserves the original LLC's formation date, file number, and any contracts or bank accounts tied to that entity — often worth the extra cost.
6. Illinois vs. Wisconsin, Indiana, Missouri, Iowa
How does Illinois compare to neighboring states for business entity formation, search, and ongoing compliance costs? Here is a complete side-by-side comparison:
| State | Search Portal | LLC Formation | Annual Report | Good Standing Cert | Notes |
|---|---|---|---|---|---|
| Illinois | ilsos.gov/corporatellc | $150 | $75 (before April 1) | $25 | Cyberdrive database; covers LLC, Corp, LP, LLP; functional but dated UI |
| Wisconsin | wdfi.org/apps/CorpSearch | $130 | $25 (before March 31) | $10 | Wisconsin DFI portal; free search; modern interface; lower annual fee |
| Indiana | inbiz.in.gov | $95 | $32 (biennial, every 2 years before April 1) | $8 | INBiz portal combines search, formation, and annual reports in one system |
| Missouri | bsd.sos.mo.gov | $50 | None for LLCs; $45 for Corps | $10 | Lowest formation fees in region; no LLC annual report - significant cost advantage |
| Iowa | sos.iowa.gov | $50 | $45 (biennial, every 2 years) | $5 | Low fees; biennial LLC report; simpler compliance than Illinois |
Illinois vs. Missouri: Cost Comparison
Missouri offers the most dramatic cost advantage in the region. With a $50 LLC formation fee (vs. Illinois's $150) and no LLC annual report requirement(vs. Illinois's $75/year), a Missouri LLC costs roughly $25/year to maintain (registered agent only) vs. Illinois's $75+/year. Over 5 years, that's $375 saved in annual report fees alone. However, Illinois has a much larger business ecosystem and is the appropriate choice for businesses primarily operating in Illinois.
Illinois vs. Indiana: Portal Comparison
Indiana's INBiz portal (inbiz.in.gov) is significantly more modern and user-friendly than Illinois's Cyberdrive system. INBiz combines business search, formation, and annual report filing in a single integrated platform. Indiana also has a lower LLC formation fee ($95 vs. $150) and a lower biennial annual report fee ($32 every 2 years vs. $75/year in Illinois). For businesses with equal ties to both states, Indiana is generally cheaper to form and maintain.
7. Illinois Registered Agent Requirements
Under 805 ILCS 5/5.10 (Corporations) and 805 ILCS 180/1-35(LLCs), every Illinois LLC and corporation must maintain a registered agent in Illinois. Requirements:
| Requirement | Status | Details |
|---|---|---|
| Physical Illinois street address | Required | Must be a real street address in Illinois; P.O. Boxes are not permitted |
| Available during business hours | Required | Monday-Friday, 9 AM-5 PM; must be reachable to accept service of process |
| Illinois residency (individuals) | Required for individuals | Non-Illinois residents cannot serve as IL registered agents |
| Authorized to do business in IL (corporations) | Required for corporate agents | Commercial registered agent companies must be authorized in Illinois |
| Not the LLC itself | Required | An LLC cannot be its own registered agent in Illinois |
Illinois Registered Agent Provider Comparison
| Provider | Annual Fee | Notes / Best For |
|---|---|---|
| Northwest Registered Agent | $125/yr | Best overall; privacy-focused; covers IL street address requirement |
| Incfile / Bizee | $119/yr | Good budget option; solid IL compliance portal |
| ZenBusiness | $199/yr (bundled) | Best for new LLCs using ZenBusiness IL formation service |
| Registered Agents Inc. | $200/yr | Reliable nationwide; strong compliance tracking for IL deadlines |
| CT Corporation (Wolters Kluwer) | $299+/yr | Enterprise-grade; handles IL and all other states seamlessly |
| DIY (IL residents only) | $0 | Must have IL physical address; home address becomes public record in ILSOS database |
Changing your Illinois registered agent: File an updated annual report with the new agent's information listed, OR file a separate agent change form (Form LLC-1.36/2 for LLCs) with the Illinois Secretary of State. The fee for a mid-year agent change is typically included in the annual report fee or available as a standalone filing. Unlike California, Illinois does not require a separate Statement of Information form — the annual report handles agent updates.
8. Frequently Asked Questions
How do I search for a business entity in Illinois?
Go to the Illinois Secretary of State Cyberdrive portal at ilsos.gov/corporatellc. Enter the business name or file number in the search field, select entity type if known, and click Search. Results show entity name, file number, type, status, and formation date. Click any result to open the full entity detail page, which includes the registered agent, managers, and filing history. The search is free and available 24/7 without login.
What is the Illinois LLC filing fee in 2026?
The Illinois LLC formation fee (Articles of Organization) is $150 as of 2026, paid to the Illinois Secretary of State. LLCs must also pay a $75 annual report fee before April 1 each year. Expedited 24-hour processing adds $100 ($250 total). The state income tax is 4.95% flat rate on LLC income passed through to members.
When is the Illinois LLC annual report due?
Illinois LLC annual reports are due before April 1 of each year. The fee is $75. Failure to file by April 1 results in 'Not Good Standing' status. Extended non-compliance leads to administrative dissolution. To return to Active from Not Good Standing, file the past-due annual report ($75). Reinstatement after administrative dissolution requires Form LLC-35.40 plus a $100 fee and all back annual reports ($75 per missed year).
What does 'Not Good Standing' mean for an Illinois LLC?
An Illinois LLC in 'Not Good Standing' has overdue annual reports or unpaid fees but has not yet been administratively dissolved. It can technically still operate, but is not in compliance with Illinois law. Not Good Standing entities cannot obtain a Certificate of Good Standing (required for bank loans, contracts, and licensing), and risk administrative dissolution. Filing the past-due annual report ($75) immediately returns the LLC to Active status.
How do I reinstate an Illinois LLC after dissolution?
To reinstate an administratively dissolved Illinois LLC: (1) File Form LLC-35.40 (Application for Reinstatement) with the Illinois Secretary of State; (2) Pay the $100 reinstatement fee plus all back annual report fees ($75 per year missed); (3) File all missed annual reports; (4) Ensure registered agent information is current. The IL SOS processes reinstatements in 3-5 business days. The LLC keeps its original file number.
How does Illinois compare to Wisconsin, Indiana, and Missouri for business entities?
All four states offer free entity search. Indiana's INBiz portal (inbiz.in.gov) is the most modern. Missouri stands out for having no LLC annual report requirement - a significant ongoing cost advantage. Formation fees: Missouri ($50) and Indiana ($95) are cheaper than Illinois ($150). Wisconsin ($130) is comparable. Illinois's $75 annual report fee is higher than Indiana's $32 biennial fee or Missouri's $0. Illinois also has a 4.95% state income tax.
Search Illinois Business Entities on Corporate.AI
Corporate.AI aggregates Illinois LLC and corporation data from the Illinois Secretary of State Cyberdrive database alongside all 50 state databases into a single national registry. Search 38 million+ entities by name, agent, state, or entity type — without switching between state portals.
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