Illinois Formation Guide

Form a 🏦 C-Corp in 🌆 Illinois

Step-by-step guide to forming a C-Corp in Illinois. Filing fee ($150), requirements, timeline, taxes, and what international founders need to know.

Start Formation — $150 → Get AI Recommendation

$150

Filing Fee

$75/yr

Annual Cost

Min Processing Days

Low

Privacy Level

Why Illinois for a C-Corp?

Midwest Finance & Commerce Hub

✓ Illinois Advantages

Access to Chicago financial ecosystem
Strong B2B market
Established legal infrastructure
Diverse economy

✗ Considerations

Franchise tax on paid-in capital
Higher filing fee ($150)
Complex corporate compliance
State income tax

How to Form a C-Corp in Illinois

Step-by-step process for international founders.

Choose a state (Delaware recommended)

File Articles of Incorporation

Appoint directors

Issue shares

Get EIN

File 83(b) election if founders vesting

File annual report / pay annual fees in Illinois

Annual fee: $75. Due: Annually

C-Corp in Illinois: Costs Breakdown

Cost Item	Amount	Notes
State filing fee	$150	One-time, paid to Illinois SOS
Registered agent (Year 1)	$50–$150/yr	Required in Illinois
Annual report / renewal	$75/yr	Due: Annually
EIN (Federal Tax ID)	Free	Apply via IRS Form SS-4
Operating Agreement / Bylaws	$0–$500	DIY or attorney-drafted
Business bank account	$0	Mercury or Relay recommended
Total Year 1 (estimated)	$325–$875	Varies with registered agent choice

Tax Treatment: C-Corp in Illinois

Federal Tax

Entity-level 21% federal corporate tax

IRS Form: Form 1120

State Tax in Illinois

Yes (4.95% flat)

Franchise tax: Yes (on paid-in capital)

Frequently Asked Questions

Can I form a C-Corp in Illinois as a non-US resident?

Yes. Illinois allows non-US residents to form a C-Corp entirely remotely. You need a registered agent with a Illinois address, and you'll apply for an EIN from the IRS using Form SS-4.

Do I need to live in Illinois to form a C-Corp there?

No. You can form a Illinois C-Corp from anywhere in the world. However, you must maintain a registered agent with a physical Illinois address.

How long does C-Corp formation take in Illinois?

Standard processing: 3–7 days. Expedited processing is available for an additional fee through the Illinois Secretary of State.

What bank account should I open for my Illinois C-Corp?

Mercury and Relay are the top choices for international founders. Both open accounts fully online, require no US visit, and work well with Illinois entities.