Illinois Business Name Search: How to Check and Reserve a Name

Illinois Business Name Search: How to Check and Reserve a Name

Illinois Business Name Search: How to Check and Reserve a Name

Picking a business name is one of the first decisions you'll make as an entrepreneur. But before you fall in love with a name and invest money into branding, you need to make sure it's actually available in Illinois. This guide walks you through the entire process of conducting an Illinois business name search and reserving a name so no one else can claim it while you're setting up your business.

Why You Need to Search First

Searching for business name availability serves two critical purposes. First, it ensures you won't waste time and money building a brand around a name that's already taken by another registered business in Illinois. Second, it protects you from potential legal conflicts with existing businesses that have similar names. The Illinois Secretary of State maintains a searchable database of all registered business entities in the state, and you have free access to it.

If you find your desired name is available, you can reserve it for up to 90 days while you prepare your formation documents. This reservation gives you breathing room to finalize your business structure, get an Employer Identification Number (EIN), and handle other startup logistics.

What You'll Need Before You Start

The good news: you don't need much to search for a business name in Illinois. Here's what you should have ready:

  • Your desired business name (or a list of 3 to 5 options)
  • A web browser with internet access
  • Your chosen business structure (LLC, corporation, partnership, or sole proprietorship)
  • A credit card if you decide to reserve the name ($25 reservation fee)
  • About 15 minutes of your time

You do not need a lawyer, accountant, or registered agent to search or reserve a name. This is a straightforward process you can do yourself online.

Step 1: Access the Illinois Business Entity Search Database

Start by going to the official Illinois Secretary of State business search portal at https://apps.ilsos.gov/businessentitysearch/. This is the authoritative source for all registered business entities in Illinois. Bookmark this link for future reference.

The search tool is free and open to anyone. You don't need to create an account or provide any personal information to search. The database is updated regularly, though there can be a short lag between when a business is registered and when it appears in the search results.

Step 2: Conduct Your Name Search

Once you're on the business search page, you'll see a search box. Enter your desired business name exactly as you plan to file it. For example, if you want to form an LLC, you might search for "Smith Consulting LLC" or just "Smith Consulting" depending on how you want to structure the name.

Here's what to look for in the results:

  • Exact matches: If a business with your exact name appears in the results, that name is taken. You'll need to choose a different name.
  • Confusingly similar names: Even if you don't find an exact match, check for names that are too similar. The Illinois Secretary of State requires business names to be "unique and distinguishable" from existing entities. A name like "Smith Consulting Group LLC" is too close to "Smith Consulting LLC." Courts and the Secretary of State consider factors like spelling, pronunciation, and meaning when determining if names are confusingly similar.
  • No results: If your search returns no matches, that's a good sign. However, a blank result doesn't guarantee absolute availability. Keep reading to understand the next steps.

Run multiple searches if you have several name options. Try variations with and without descriptors like "LLC," "Inc.," or your city name. This thorough approach now will save you frustration later.

Step 3: Verify the Name Meets Illinois Requirements

Illinois has specific naming requirements depending on your business structure. These rules exist to prevent confusion about what type of business you are.

For Limited Liability Companies (LLCs)

If you're forming an LLC, your name must:

  • Include the words "Limited Liability Company," "LLC," or "L.L.C." at the end
  • Be unique and distinguishable from all other registered businesses in Illinois
  • NOT contain the words "Corporation," "Corp.," "Incorporated," "Inc.," "Ltd.," "Co.," "Limited Partnership," or "L.P."

For example, "Sweet Designs LLC" works, but "Sweet Designs Corporation" does not. You cannot mix the signals about your business structure.

For Corporations

Corporations must include a corporate designator like "Corporation," "Corp.," "Incorporated," or "Inc." The name cannot include "LLC" or "Limited Liability Company." Your name must also be unique and distinguishable in the Secretary of State database.

For Partnerships and Sole Proprietorships

General partnerships and sole proprietorships typically file what's called an assumed business name (or DBA, "doing business as") with both the Illinois Secretary of State and the County Clerk in each county where you operate. These names don't require specific suffixes, but they still must be unique.

Step 4: Check for Federal Trademark Conflicts

Before you reserve your name at the state level, do a quick federal trademark search. While the Illinois Secretary of State search only checks state-level registrations, federal trademarks take precedence over state names. You don't want to invest in a business name only to discover someone holds a federal trademark for the same or similar name.

Visit the U.S. Patent and Trademark Office (USPTO) database at www.uspto.gov and search their trademark database for free. Look for exact matches and phonetically similar names. If someone has already registered your desired name as a federal trademark, you should choose a different name to avoid potential legal problems down the road.

Step 5: Reserve Your Business Name

If your search confirms the name is available and it meets Illinois naming requirements, you can reserve it. A name reservation protects your choice for up to 90 days, giving you time to prepare your formation documents and handle other startup tasks.

Name Reservation Fee and Process

The cost to reserve a business name in Illinois is $25. Name reservations are handled through the Illinois Secretary of State online filing portal at https://apps.ilsos.gov/llcarticles/index.jsp. You'll submit Form LLC-1.15 (or the equivalent form for your business structure) along with your payment.

The reservation is typically processed within 1 to 2 business days when filed online. Once approved, you'll receive a confirmation email and your name is protected for 90 days from the date of reservation.

How to Extend Your Reservation

If you need more time, you can renew your name reservation for another 90 days by filing again and paying another $25 fee. However, keep in mind you can only renew once. After that 180-day total period, your reservation expires and the name becomes available to others again. Most business owners complete their formation within this window, so a single reservation is usually sufficient.

What Happens After You Reserve Your Name

Once your name is reserved, the clock starts ticking. You now have 90 days to complete your actual business formation. For an LLC, this means preparing your Articles of Organization and filing them with the Secretary of State. For a corporation, you'll file Articles of Incorporation. The standard filing fee for either is $150, and processing typically takes 10 business days.

If you complete your formation within 90 days, your reserved name becomes your official business name and appears in the Secretary of State database. If you don't file within 90 days, the reservation expires and someone else could claim the name.

Tips to Avoid Common Mistakes

Don't Assume "No Results" Means It's Truly Available

The Secretary of State database may lag slightly behind newly registered businesses. Do a second search one week later to double-check. Also remember that federal trademarks trump state registrations, so always check the USPTO database even if the Illinois search comes back clear.

Don't Ignore Confusingly Similar Names

The Illinois Secretary of State has authority to refuse to register a name that's too similar to an existing business. Before you fall in love with a name, look at similar variations. If "Superior Cleaning LLC" is already taken, "Superior Cleaners LLC" or "Superior Cleaning Services LLC" might also be rejected as confusingly similar.

Don't Mix Your Business Type Indicators

If you're forming an LLC, the name must include LLC or Limited Liability Company. You can't use "Inc." or "Corp." to describe an LLC. The Secretary of State will reject this. Conversely, if you're forming a corporation, you must use a corporate designator, not LLC. Get this right the first time to avoid delays and additional fees.

Don't File Your Formation Documents Without Reserving First

Some business owners skip the reservation step and go straight to filing their formation documents. While this works if the name is available, it's riskier. A reservation costs only $25 and buys you 90 days of protection for a specific name. Use this period to prepare everything properly. If you file immediately and something isn't right, you've already paid the $150 formation fee.

Don't Forget Your County Registration

If you're operating as a sole proprietor or partnership under an assumed name (DBA), you must also file with your County Clerk. The Secretary of State search covers only LLCs and corporations. County filings are separate and required by the Assumed Business Name Act. Contact your local County Clerk's office for their specific filing requirements and fees.

Expected Results and Timeline

Here's what you can realistically expect at each stage:

  • Name search: Results are immediate, appearing within seconds of your query.
  • Name reservation: Approval typically comes within 1 to 2 business days for online filings. You'll receive a confirmation email.
  • Reservation validity: Your reservation is protected for 90 days from the approval date. After that, the name is open to others.
  • Formation filing: After your reservation is approved, you can proceed with filing your full formation documents (Articles of Organization or Articles of Incorporation). The standard processing time is 10 business days.

If you want to accelerate this process, the Secretary of State offers expedited filing. For an additional $100 fee, your name reservation can be processed within 24 hours instead of 1 to 2 business days. Expedited formation filings cost $250 total and are also completed within 24 hours. These expedited services are available only through in-person filing at the Springfield or Chicago offices, not online.

Next Steps After Your Name is Reserved

Once your name is successfully reserved, your next tasks are:

  1. Decide on your business structure (LLC, C corporation, S corporation, etc.) based on your tax situation and liability concerns.
  2. Obtain an Employer Identification Number (EIN) from the IRS if you plan to hire employees or operate as a partnership or corporation.
  3. Open a business bank account in your business name. You'll need your EIN letter or your name reservation confirmation.
  4. Prepare and file your formal formation documents (Articles of Organization for LLCs, Articles of Incorporation for corporations) with the Secretary of State before your 90-day reservation expires.
  5. Comply with local registration requirements. Many cities and counties require their own business licenses or permits on top of state registration.
  6. If applicable, obtain industry-specific licenses. Depending on your business type, you may need additional professional licenses from the Illinois Department of Financial and Professional Regulation or other state agencies.

For detailed information on any of these topics, visit the Illinois Secretary of State, Department of Business Services at https://www.ilsos.gov/departments/business-services.html. The website includes downloadable forms, fee schedules, and guidance documents for each business structure.

Important Disclaimer

This article provides informational guidance about Illinois business name search and reservation procedures. It is not legal or tax advice. Business formation involves important legal and financial decisions that vary depending on your specific situation, industry, and goals. Before making final decisions about your business structure or name, consult with a qualified attorney and a CPA or tax professional. They can advise you on liability protection, tax efficiency, and compliance requirements specific to your business.

The information in this article is accurate as of the date published and reflects the Illinois Secretary of State's current procedures and fee schedules. Rules and fees are subject to change. Always verify current requirements directly with the Illinois Secretary of State before submitting any filings.