Illinois LLC Taxes (2026)

Understand Illinois LLC taxes in 2026, including federal classification, state tax registration, sales tax, payroll accounts, recurring fees, and local obligations.

LLC Route Editorial Team

Reviewed against official state and federal resources.

Updated July 28, 2026

Educational guide, not legal or tax advice.

Illinois LLC taxes depend on how the LLC is taxed federally, what it sells, where it operates, and whether it has employees. The $150 Illinois LLC filing and the $75 annual report are Secretary of State costs. They are not the same as income tax, sales tax, payroll tax, or local tax obligations.

Educational note: This guide is for general informational purposes only. It is not legal, tax, accounting, or financial advice. Work with a tax professional for your filing position.

Quick answer

Question	Practical answer
Does Illinois have a standard LLC annual report?	Yes, $75 every year
Is the annual report an income tax return?	No
Federal tax default for single-member LLC	Usually disregarded entity
Federal tax default for multi-member LLC	Usually partnership
Can an LLC elect corporate tax treatment?	Yes, if eligible and properly elected
State tax registration	IDOR when required
Main portal	MyTax Illinois
Employer accounts	Withholding and unemployment may apply

Separate the tax layers

Do not treat “Illinois LLC tax” as one single item. A real Illinois LLC checklist can include:

Federal income tax
Self-employment tax for active owners
Federal payroll tax if hiring
Illinois income tax or replacement tax issues
Illinois retailers’ occupation tax and use tax accounts
Illinois withholding tax
IDES unemployment insurance
Local taxes or local business license taxes
Industry-specific taxes

The right answer depends on the business model.

Federal tax classification

By default:

A single-member LLC is usually disregarded for federal income tax.
A multi-member LLC is usually taxed as a partnership.
An LLC can elect to be taxed as a corporation if eligible.
Some LLCs elect S corporation treatment after entity classification planning.

The operating agreement, bookkeeping, payroll, and owner payments should match the tax classification. Do not copy a tax structure from another business without checking whether it fits your numbers.

Illinois Department of Revenue registration

Illinois Department of Revenue says businesses must register with IDOR if they conduct business in Illinois or with Illinois customers, including businesses that withhold Illinois income tax for employees, subject to exceptions. IDOR says MyTax Illinois is available for business registration using Form REG-1.

Register before the activity that creates the requirement. IDOR explicitly says to register before purchases, sales, or hiring when applicable.

Sales and use tax

Illinois sales tax can be more detailed than a simple state percentage. Retailers’ occupation tax, use tax, local rates, marketplace rules, exemptions, and location sourcing can all matter. For ecommerce, do not assume “online only” means no Illinois responsibility.

Employees

If the LLC hires employees in Illinois, it may need:

EIN
Federal payroll accounts
Illinois withholding registration
IDES unemployment insurance registration
New hire reporting
Workers’ compensation insurance
Payroll filings and deposits

Taxes FAQ

Is the Illinois annual report a tax?

No. It is a Secretary of State compliance filing.

Does EIN register me for Illinois sales tax?

No. EIN is federal. IDOR registration is separate.

Does every Illinois LLC pay the same taxes?

No. Taxes depend on income, tax classification, sales, payroll, location, and activity.

Should I register with IDOR before forming the LLC?

Usually form the LLC first, then register the accepted legal entity with IDOR when required.

Official resources

CostSee Illinois LLC costs in 2026, including state filing fees, recurring fees, registered agent, EIN, taxes, licenses, and common add-on costs.TimeSee Illinois LLC processing time factors in 2026, including online filing, paper filing, name issues, registered agent mistakes, EIN timing, and next steps.NameLearn how to search a Illinois LLC name in 2026, check distinguishability, avoid name rejection, and separate legal names from DBAs, domains, and trademarks.Registered AgentUnderstand Illinois registered agent rules for LLCs in 2026, including who can serve, address requirements, privacy tradeoffs, and when to use a service.ArticlesLearn how to file the Illinois LLC formation document in 2026, what information to prepare, what the filing fee covers, and what to do after approval.AgreementLearn what an Illinois LLC operating agreement should cover in 2026, why banks and partners ask for it, and how it supports ownership and management.

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