Illinois LLC Costs – Full Breakdown (Apr. 2026)

You must pay a one-time $150 fee to file your Articles of Organization with the Illinois Secretary of State (SOS). This document officially establishes your Limited Liability Company (LLC) as a separate business entity.

Once approved, you need to consider your ongoing operational costs. These include a $75 Annual Report fee and any applicable business licenses and permit renewals. Alongside this, your total operating costs may be higher if you choose optional business services such as hiring a Registered Agent or using an expedited filing service.

The table below summarizes your main LLC Illinois costs required when forming and maintaining your Illinois LLC. Use this as a handy reference point when setting your LLC’s operational budget.

In this article, I will discuss the main Illinois LLC costs, including the mandatory requirements and potential additional costs.

For step-by-step guide on starting an LLC in Illinois, you can read this article: How To Start An LLC In Illinois.

A Comprehensive Breakdown Of Main Illinois LLC Costs

1. Choose Your Desired LLC Name ($0)

Your first step when forming your Illinois LLC is to choose a suitable business name. This must be:

• Unique and distinguishable compared to existing state businesses.
• Follow the state’s naming rules and regulations (Designators, allowed and restricted terms used, etc.).

Use the free Department of Business Services’ Business Entity Search tool to compare your desired LLC name to existing state businesses. This helps you determine if your LLC name is available to use.

I’ve written step-by-step instructions on how to use this tool and discussed the key filing requirements under Illinois state law in this article: Illinois LLC Business Name Search.

2. Appoint Your Registered Agent ($0–$199 Per Year)

Every Illinois LLC operating in the state must appoint and maintain an official Registered Agent under the 805 Illinois Compiled Statutes (ILCS) 180/1-35. Your Registered Agent is the designated contact point to receive and process important state regulatory notices, legal filings, and service of process on behalf of your LLC.

You can appoint an individual or entity, provided that they meet the state requirements:

• They must have a physical Illinois street address (you can NOT use a P.O. box).
• They must be available during normal business hours.

If you appoint yourself or someone you know, your total cost for this step may be very little or nothing at all. However, this comes with several compliance and privacy risks:

• It exposes personal information to the Illinois public record.
• It increases the risk of your LLC becoming non-compliant.

Therefore, I highly suggest hiring a professional Registered Agent. They’ll protect your privacy and ensure that your compliance measures are completed on time. Generally speaking, these cost around $100 to $199 per year, making this one of your main Illinois LLC costs.

You can read my guide on the Best Illinois Registered Agent Services if you need a comprehensive comparison of the top providers.

3. File Your Illinois Articles Of Organization ($150)

Under 805 ILCS 180/5-5(b), your Illinois LLC is not recognized as a legal business entity until your Articles of Organization have been accepted by the SOS. This is the foundational document that legally establishes your LLC in the state.

Your processing time depends on your chosen filing method:

• Online: Applications are processed in 5-10 business days using the Illinois SOS’s online portal.
• By mail: Applications are processed in 10-15 business days + mailing time. You must complete and send Form LLC-5.5.

Alternatively, you can use a 24-hour expedited service if you want to speed up your processing time. This costs $100, which is added to your standard filing fee.

Read my guide on How To File Your Illinois Articles Of Organization for detailed instructions.

4. Create Your LLC Internal Operating Agreement ($0)

An Illinois Operating Agreement is a foundational LLC rulebook defining how your business will be managed, operated, and governed.

As an internal document, Illinois law does NOT require your LLC to adopt or maintain one with the SOS or any other official state agency. Despite this, I highly recommend drafting and maintaining one. Having one in place when operating ensures that you don’t need to follow Illinois’s default statutory rules regarding your internal business structure and helps to prevent internal disputes between LLC members.

Example: If your LLC is manager-managed under 805 ILCS 180/15-5, this must be stated in your Operating Agreement. Otherwise, it will be treated as member-managed by default.

You can use my free templates below if you want to draft one yourself at no cost. I’ve written one for each business structure.

5. Obtain Your Employer Identification Number ($0)

An Employer Identification Number (EIN) is a unique nine-digit federal tax identification number issued by the Internal Revenue Service (IRS).

You must get an EIN to perform several important business functions. These include:

• Opening a dedicated business bank account.
• Filing your federal taxes.
• Hiring LLC employees.

You must obtain an EIN in Illinois before completing your mandatory state tax registrations. You can read my article on How To Get An EIN For An Illinois LLC to understand how this works in the state.

6. Register Your LLC With the Illinois Department Of Revenue ($0)

Your LLC will be subject to at least one state tax if it operates in Illinois or has customers in the state. This is most commonly the Sales Tax, the Withholding Tax, the Income Tax, and the applicable Industry-Specific Taxes.

This is why it’s so important that you register with the Illinois Department of Revenue (IDOR).

You can register your Illinois LLC with the Department of Revenue using three different methods:

1. Online: Through the MyTax Illinois portal. Applications take 1-2 business days to process.
2. By mail: Complete and submit Form REG-1. This usually takes around 4-6 weeks to process.
3. In person (at an IDOR office): Complete and file Form REG-1 in person. Your application will be processed immediately.

You will be issued a Certificate of Registration or License once your registration is complete. This will be given for each tax type, alongside your Illinois Tax Account ID or License Number.

I’ve written a detailed guide on your different registration requirements here: Illinois Business Tax Registration.

7. Obtain Your Required Business Licenses (Varies)

However, you may still have other licensing obligations, depending on your operating location and industry.

You may still need to get your:

• State-level occupational licenses.
• Local industry-specific licenses and additional permits, inspections, and approvals.

I recommend contacting the relevant authority to confirm the types of licenses and permits that you need to get. With each licensing board setting its own registration and cost schedules, your fees vary.

You can read my guide if you’re looking for useful sources of contact information regarding your business licenses: How To Get Your Illinois LLC Business Licenses.

8. File Your Annual Report ($75 Per Year)

Every LLC operating in the state must file an Annual Report with the SOS under 805 ILCS 180/50-1. This ensures that they remain active and maintain their good standing when operating.

Online submissions are processed immediately. Mail filings can take up to 10-15 days to complete. Alternatively, you can pay an additional $50 to use an expedited service.

You should get a pre-filed version approximately 45 days before your due date. This will be sent by the Illinois SOS to your Registered Agent, as shown in the state’s Guide for Organizing LLCs. I advise filing it straight away to avoid forgetting.

Read my detailed article on the Illinois LLC Annual Report for more information.

9. Pay Your Illinois LLC Taxes (Varies)

Your LLC tax obligations generally fall into three main categories. You need to identify which local, state, and federal taxes apply to your business.

• Federal tax: This depends on how your LLC is classified by the IRS.
• State tax: You must pay the required taxes registered with the IDOR in the previous step. This may include Sales Tax, Business Income Tax, and Withholding Tax.
• Local/municipal taxes: Certain cities and counties impose additional taxes based on your gross receipts.

Your LLC’s tax classification is based on your LLC member number:

• Single-member LLCs: Taxed as disregarded entities by default.
• Multi-member LLCs: Taxed as partnerships by default.

You can also elect to be taxed as a C-corporation or an S-corporation by filing the applicable forms with the IRS.

Contact Information For The Illinois State Agencies

If you need help with any of your Illinois LLC formation procedures, you can contact the following state agencies for help and guidance. They’ll provide advice on the filing requirements and help with potential issues.

1. Illinois SOS – Department Of Business Services

Contact the Department of Business Services if you require help as a domestic or foreign LLC registered to do business in the state. Their main offices are located in Chicago and Springfield.

Springfield office
501 S. Second St., Room 350, Springfield, IL 62726
Phone: 800-252-8980
Hours: Mon to Fri, 8:00 A.M. to 4:30 P.M.

Chicago office
69 W. Washington St., Suite 1240, Chicago, IL 60602
Phone: 800-252-8980
Hours: Mon to Fri, 8:00 A.M. to 4:30 P.M.

2. Illinois Department Of Revenue

Contact the Illinois Department of Revenue if you need help regarding your business tax registration, Certificate of Registration, and ongoing state tax compliance procedures. They can also provide over-the-phone translation services.

• Phone number: 217-782-3336 or 217-524-4772.
• Local office: Regional Office Locations & Contact Information.
• Opening hours: 8:00 A.M. to 5:00 P.M., Monday to Friday.
• Email address: This varies by tax-type matters. Check the website I provided for the relevant address.

Frequently Asked Questions