IL · Tax year 2026
LLC vs S-Corp in Illinois. A localized number.
At $100,000 net profit with a $50,000 W-2 salary, the federal payroll tax delta is $7,680. Adjusted for Illinois's $75 annual franchise/report fee, the estimated net modeled benefit (yr 1) is $7,605.
LLC Filing Fee
$150
one-time, Illinois Secretary of State
Annual Franchise / Report
$75
recurring, every year
State Income Tax
Yes
ordinary rates apply · not modeled
Estimated Net Modeled Benefit (yr 1)
$7,605
federal delta minus the annual fee
01 · Illinois model
Tune the inputs. Numbers update live.
Illinois annual fee (deducted from savings)
$75
LLC
Federal payroll tax
$14,130
S-CORP
Federal payroll tax
$6,450
Estimated Net Modeled Benefit (yr 1)
$7,605
Federal SE tax saved (LLC vs S-Corp) minus Illinois's $75 annual fee. The $150 filing fee is not included — it's a one-time setup cost. Income tax, QBI, health insurance, and retirement contributions are not modeled.
02 · Why Illinois specifically
The state-level numbers that move the answer.
An S-Corp election only pencils out when the federal payroll tax saved outpaces the recurring cost of running a corporate entity. Illinoischarges $75per year to keep your entity in good standing and assesses ordinary state income tax on top of the federal figure.
At the calculator's default $100K / $50K inputs, the federal delta ($7,680) is what an LLC owner gives up in self-employment tax on net profit. After the Illinois annual fee, the estimated net modeled benefit is$7,605.
State-specific note: Illinois requires an annual report ($75) for LLCs.
Localized formula
// Illinois adjusted
llcTax = netProfit × 0.9235 × 0.153
scorpTax = salary × 0.153 − 1200
savings = llcTax − scorpTax − 75- LLC filing: one-time $150 to form the entity in Illinois.
- Annual franchise / report: $75/yr to maintain good standing.
- State income tax: applies on top of federal ordinary rates; not modeled.