The choice affects annual state filings, franchise-tax exposure, income-tax treatment, ownership flexibility, corporate formalities, and the ongoing cost of compliance. Illinois entity law and federal tax elections are separate layers, and this guide keeps them apart.
This article is informational only and is not legal or tax advice. Rates, fees, and deadlines change, so confirm current figures with the Illinois Secretary of State (SOS), the Illinois Department of Revenue (IDOR), and the IRS.
Key Takeaways
- Illinois LLCs pay a $75 annual report fee; corporate franchise tax falls under the Business Corporation Act.
- Corporations owe the $75 report fee plus franchise tax when it's payable.
- LLC income tax follows federal classification: disregarded, partnership, S corporation, or C corporation.
- Pick the structure based on owners, investors, profits, and paperwork tolerance.
Illinois LLC vs Corporation: Quick Comparison
Franchise tax was not repealed. A 2019 phase-out never reached zero, and since January 1, 2025, the first $10,000 of franchise tax liability is exempt. The exemption applies to tax owed, not to capital.
| Factor | Illinois LLC | Illinois corporation (including authorized foreign) |
|---|---|---|
| Franchise tax | Not imposed by the LLC Act; only the annual report fee applies | Initial rate 0.15% and annual rate 0.1% of the allocated base, after the exemption |
| Annual report fee | $75 | $75, plus franchise tax if payable |
| Filing window | The 60 days before the first day of the anniversary month | Same 60-day window; tax accompanies the report |
| Late consequences | $100 late fee, then $100 per year; 120 days to cure after notice | 10% penalty and 2% monthly interest on unpaid net tax; 90 days to cure after notice |
| Reinstatement fee | $200, plus back reports and fees | $200, plus delinquent filings and amounts due |
| Income tax | Follows federal classification | C corporation by default; S election possible |
| Governance | Operating agreement; member or manager management | Bylaws, directors, officers, minutes, stock records |
| Fundraising | Fits closely held businesses | Familiar to outside investors, especially venture funds |
Confirm all fees, rates, and deadlines against current SOS and IDOR pages before filing.
Illinois LLC and Corporation: What Each Structure Owes
What Is an Illinois LLC?
An LLC is an entity formed under 805 ILCS 180 that limits members' personal liability. Members run it under an operating agreement. Without one, it is member-managed by default, with equal management rights and majority control of ordinary matters.
Protection isn't automatic immunity. Statute preserves liability for your own wrongful acts, and courts can still pierce the veil. Skipping formalities isn't itself a ground for personal liability, but mixing personal and business money invites trouble.
Federal defaults:
- One member: disregarded entity, reported on the owner's return
- Two or more members: partnership
- Either can elect C or S treatment (Form 8832, or a timely Form 2553)
An election changes the tax classification, not the entity. It stays an LLC under Illinois law.
Illinois obligations beyond the annual report:
- Continuous registered office and registered agent
- Income tax by classification: IL-1065 (partnerships), IL-1120-ST (S corporations), or IL-1120 (C-taxed entities)
- Partnerships: 1.5% replacement tax, with an optional 4.95% pass-through entity tax
- Sales and use tax, if you sell taxable goods or services
- Withholding (IL-941) and unemployment insurance if you have employees
- Industry-specific and local taxes where applicable
Verify current forms and rates with IDOR.
What Is an Illinois Corporation?
A corporation is a legal entity under the Business Corporation Act (805 ILCS 5). Its federal tax status is a separate question. A C corporation pays its own tax. An S election passes income to shareholders, but the entity is still a corporation under state law.
How franchise tax is calculated:
- Start with paid-in capital (stated capital plus paid-in surplus).
- Multiply by the Illinois allocation factor: (Illinois property + Illinois business) ÷ (total property + total business).
- Apply the rate: 0.15% initially, 0.1% annually.
- Subtract the $10,000 exemption.
The Secretary of State's BCA 14.05 form walks through this calculation line by line. It covers penalty and interest lines and the $75 report fee. Capital increases can trigger additional franchise tax, reported on BCA 14.30.
Ongoing formalities:
- Bylaws consistent with the articles and law
- Elected directors and officers
- An annual shareholder meeting, per the bylaws or a board resolution
- Minutes and a shareholder record showing names, addresses, share counts, and classes
An S election removes neither these formalities nor the franchise tax.
Illinois LLC vs Corporation: Which Is Better?
Don't pick an entity just because it seems to dodge franchise tax. With a $10,000 exemption, many small corporations owe little or none anyway. Compare total tax, fees, workload, ownership needs, liability protection, and long-term plans.
When an LLC Fits
An LLC suits a closely held business that wants flexible management, customizable profit splits, pass-through taxation, and lighter internal formalities. The tax result still depends on classification and activity.
When a Corporation Fits
Choose a corporation when you expect:
- Institutional or venture investment
- Multiple stock classes
- Broad employee equity
- Retained earnings
- A standardized governance structure
The University of Illinois's technology office notes that VCs generally prefer C corporations because they can issue preferred stock.
Federal Section 1202 can exclude gain on qualifying small business stock (50% after three years, 75% after four, 100% after five, for stock acquired after July 4, 2025).
Illinois, however, requires specified taxpayers to add back federally excluded gains for tax years ending on or after December 31, 2026. Model federal and state outcomes separately.
S Corporation Taxation Is Its Own Decision
Per the IRS S corporation guidance, eligibility requires a domestic entity, no more than 100 shareholders, one class of stock, and eligible shareholders only. Partnerships, corporations, and nonresident aliens can't hold shares.
Other points to weigh:
- Owner-employees must receive reasonable compensation through payroll before taking distributions
- Form 2553 is due within two months and 15 days of the start of the tax year it takes effect
- Illinois charges 1.5% replacement tax on S corporations, compared with 7% income tax plus 2.5% replacement tax for C corporations, per the Illinois Department of Revenue
- Payroll and added filings increase administration
Get current tax advice before electing.
Decision Checklist
- How many owners are there, and are any nonresident aliens or entities?
- What are your Illinois activities, and do you operate in other states?
- How much profit do you expect, and will you distribute or retain it?
- Will you take outside investment or issue equity to employees?
- Can you maintain minutes, stock records, and payroll discipline?
Foreign-owned structures add another layer. A wholly foreign-owned US disregarded entity generally files Form 5472 with a pro forma Form 1120, and the failure-to-file penalty is $25,000.
If you're a foreign-owned, cross-border, or multistate business needing bookkeeping, tax compliance, or financial reporting support, VJM Global can run a tailored accounting and compliance review. Entity-specific legal advice should come from a qualified attorney alongside a tax professional.
Real-World Examples
The scenarios below are labelled hypotheticals. Each one walks through process rather than projected savings.
Example 1: The LLC Owner Who Confuses Fee and Tax
Hypothetical. A two-member Illinois consulting LLC gets its annual report reminder and assumes it's paying franchise tax. It isn't.
The $75 report fee is due within the 60-day window before its anniversary month. Missing it triggers a $100 late fee and, after notice, 120 days to cure before administrative dissolution.
The real tax exposure sits elsewhere. As a partnership-taxed LLC, it files IL-1065, pays 1.5% replacement tax, and may consider the 4.95% pass-through entity election. If it hires staff, it adds IL-941 withholding and unemployment registration.
Takeaway: Separate the SOS filing from IDOR taxes, and calendar each one.
Example 2: The Corporation With Illinois Operations
Hypothetical. A Delaware corporation authorized in Illinois keeps a warehouse in the state and sells nationally. Its franchise tax depends on paid-in capital and the Illinois allocation factor, which means Illinois property and Illinois business versus totals everywhere.
The team needs the balance sheet, property records, and gross-receipts sourcing to complete BCA 14.05 (foreign version) accurately. A misstated factor or a missed capital increase produces an incorrect filing, plus a 10% penalty and monthly interest.
Takeaway: The calculation is record-driven, and a professional review before filing is cheaper than a correction afterward. Reviewing your entity and compliance setup with VJM Global before forming or converting is a sensible first step.
Conclusion
An Illinois LLC isn't a corporation with a different name. Whether franchise tax applies doesn't settle which structure is best, particularly with the $10,000 exemption in place.
Compare the full package: annual filings, federal and state tax classification, ownership goals, investment plans, and your capacity to keep records. Confirm current rules with qualified legal and tax professionals before forming or converting an entity.
Frequently Asked Questions
What are the key differences between an Illinois LLC and a corporation?
LLCs pay a $75 annual report fee and have flexible management. Corporations pay that fee plus franchise tax when payable, and must keep bylaws, minutes, and stock records. Tax classification and fundraising options also differ.
What taxes does an LLC pay in Illinois?
It depends on federal classification and activity. Possible taxes include income, replacement, sales and use, payroll, local, and industry-specific taxes. None of these are franchise tax.
Does Illinois impose a franchise tax on LLCs?
The LLC Act charges an annual report fee of $75. The franchise tax provisions apply to business corporations. An LLC may still owe other taxes, so confirm your situation with the SOS.
How is the Illinois corporation franchise tax calculated?
Paid-in capital times the Illinois allocation factor, taxed at 0.15% initially and 0.1% annually, less the $10,000 exemption. The annual calculation is on BCA 14.05. Verify current rules with the SOS.
Can an Illinois LLC elect S corporation tax treatment?
Yes, if eligible. It remains an LLC under Illinois law. Expect reasonable-compensation payroll, a Form 2553 deadline of two months and 15 days from the tax year's start, and added filings.
What annual filings does an Illinois LLC or corporation need in Illinois?
Both file annual reports in the 60-day window before the anniversary month, with the $75 fee. Corporations add franchise tax and must keep records. Missed filings can lead to administrative dissolution after notice.
