State Comparison

Illinois vs South Carolina LLC

Side-by-side comparison of forming an LLC in Illinois vs South Carolina — fees, processing times, taxes, and decision factors to help you choose the right state for your business.

Illinois

Filing fee$150

Processing5–10 days

Annual report$75

State income tax4.95% flat

1.5% replacement tax on S-corp net income

South Carolina

Filing fee$110

Processing5–10 days

Annual reportNone

State income taxVaries by personal bracket

See state Secretary of State for specifics

Lower state fees:

South Carolina — $110 total 1st-year state fees

Excludes franchise tax, registered agent, and other compliance costs

Pros and Cons

Illinois (IL)

Pros

PTET election available to work around SALT cap
Strong Midwest economy centered on Chicago
Moderate state filing fees

Cons

1.5% replacement tax on S-corp net income
Annual report deadlines trigger loss of good standing if missed
Relatively high state income tax (4.95% flat)

South Carolina (SC)

Pros

Established LLC statute
Pass-through taxation at federal level
No unusual restrictions on LLC ownership

Cons

Foreign qualification may be needed if operating elsewhere
Annual state compliance required to maintain good standing

Side-by-Side Comparison

Feature	Illinois	South Carolina
LLC filing fee	$150	$110
Corporation filing fee	$150	$135
Annual report fee	$75	None
Processing time	5–10 days	5–10 days
State income tax	4.95% flat	Varies by personal bracket
Franchise / entity tax	1.5% replacement tax on S-corp net income	See state Secretary of State for specifics
Popular formation state?	No	No

Which Should You Choose?

Choose Illinois if...

• PTET is a meaningful SALT-cap workaround for high earners

• Consider if operating in Chicago metro

• You live or operate primarily in Illinois — forming locally avoids foreign qualification costs and compliance in multiple states.

Choose South Carolina if...

• Check state-specific requirements for your industry and structure

• You live or operate primarily in South Carolina — forming locally avoids foreign qualification costs and compliance in multiple states.

FAQ

Is it cheaper to form an LLC in Illinois or South Carolina?

Illinois charges $150 filing + $75 annual report. South Carolina charges $110 filing + $0 annual report. South Carolina is the cheaper option on state fees alone, though franchise tax and other compliance costs also matter.

Should I form my LLC in Illinois or South Carolina?

For most businesses, form in the state where you actually operate. Illinois (4.95% flat state income tax) and South Carolina (Varies by personal bracket state income tax) each have their specific characteristics. If you physically operate in one of these states, form there. Forming in Illinois while operating in South Carolina (or vice versa) means paying fees in both states.

Can I form my LLC in Illinois and operate in South Carolina?

Yes, but you'll need to "foreign qualify" in South Carolina, which means paying a registration fee in South Carolina plus ongoing compliance in both states. You'll also typically owe South Carolina state taxes on income earned there regardless of where the LLC is formed. Forming in a single state (usually your home state) is typically cleaner and cheaper for small businesses.

What are the annual costs for an LLC in Illinois vs South Carolina?

Illinois: 1.5% replacement tax on S-corp net income — plus $100-$300/yr for a registered agent. South Carolina: See state Secretary of State for specifics — plus $100-$300/yr for a registered agent. Budget an additional $500-$2,000/yr for accounting, bookkeeping, and business license renewals regardless of state.

Which state has better asset protection — Illinois or South Carolina?

Asset protection varies by state statute. States like Wyoming, Nevada, and Delaware have the strongest charging-order-exclusive doctrines for LLC members. Illinois and South Carolina both offer LLC liability protection, but consult an attorney for state-specific asset protection planning if you have significant personal assets to shield.

Illinois resources

South Carolina resources

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Pros and Cons

Illinois (IL)

Pros

PTET election available to work around SALT cap
Strong Midwest economy centered on Chicago
Moderate state filing fees

Cons

1.5% replacement tax on S-corp net income
Annual report deadlines trigger loss of good standing if missed
Relatively high state income tax (4.95% flat)

South Carolina (SC)

Pros

Established LLC statute
Pass-through taxation at federal level
No unusual restrictions on LLC ownership

Cons

Foreign qualification may be needed if operating elsewhere
Annual state compliance required to maintain good standing

Side-by-Side Comparison

Feature	Illinois	South Carolina
LLC filing fee	$150	$110
Corporation filing fee	$150	$135
Annual report fee	$75	None
Processing time	5–10 days	5–10 days
State income tax	4.95% flat	Varies by personal bracket
Franchise / entity tax	1.5% replacement tax on S-corp net income	See state Secretary of State for specifics
Popular formation state?	No	No

Which Should You Choose?

Choose Illinois if...

• PTET is a meaningful SALT-cap workaround for high earners

• Consider if operating in Chicago metro

• You live or operate primarily in Illinois — forming locally avoids foreign qualification costs and compliance in multiple states.

Choose South Carolina if...

• Check state-specific requirements for your industry and structure

• You live or operate primarily in South Carolina — forming locally avoids foreign qualification costs and compliance in multiple states.