Illinois business filing
Illinois Series LLC Formation
Form LLC-5.5(S) & Form LLC-37.40 · 805 ILCS 180/37-40 · $400 state + $199 service = $599 total. $599 umbrella + $50 per Certificate of Designation. Under 805 ILCS 180/37-40(b), vertical and horizontal liability segregation requires separate records, assets and statutory notice. Suitable for real estate and multi-location operations.
Last content review: October 28, 2026
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- Illinois 805 ILCS 180 & 805 ILCS 5 statutory references
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What to know before you file
Form LLC-5.5(S) & Form LLC-37.40
Form LLC-5.5(S) & Form LLC-37.40 · 805 ILCS 180/37-40 · $400 state + $199 service = $599 total. $599 umbrella + $50 per Certificate of Designation. Under 805 ILCS 180/37-40(b), vertical and horizontal liability segregation requires separate records, assets and statutory notice. Suitable for real estate and multi-location operations.
Official source: Illinois Secretary of State — Department of Business ServicesState and local compliance
Illinois Annual Reports (Form LLC-50.1 under 805 ILCS 180/50-1; Form BCA 14.05 under 805 ILCS 5/14.05) are due before the first day of the anniversary month: the last day of the previous month. The window opens 60 days before that first day. $75 state + $99 service = $174; nonprofits use Form NFP 114.05 ($10 + $99 = $109). Series LLCs add $50 per active registered series. LLCs incur a $100 late penalty after 60 days; 180 days without filing triggers an administrative-dissolution warning. Reinstatement uses Form LLC-35.40 or BCA 12.45: $200 state + $299 service plus back reports and penalties.
Official source: Illinois General Assembly — 805 ILCSFrequently asked questions
Form LLC-5.5(S) & Form LLC-37.40 · 805 ILCS 180/37-40 · $400 state + $199 service = $599 total. $599 umbrella + $50 per Certificate of Designation. Under 805 ILCS 180/37-40(b), vertical and horizontal liability segregation requires separate records, assets and statutory notice. Suitable for real estate and multi-location operations.
Official source: Illinois Secretary of State — Department of Business ServicesNo. Check municipal licenses, MyTax Illinois registration and professional approvals before operating.
Official source: Illinois state agencyYour next chapter. In Illinois.
Corp USA is not a law firm and does not provide legal advice.