Self-Employed Tax Calculator 2026 — Illinois
Illinois self-employed workers pay federal SE tax plus Illinois's flat 4.95% state income tax, creating a predictable combined burden that makes Illinois a mid-range state for sole proprietors. This calculator shows your total Illinois self-employment tax bill and the quarterly payments due to both the IRS and the Illinois Department of Revenue.
Also see: Illinois Quarterly Tax Calculator →
Business Income
Total revenue before any deductions
Equipment, software, office supplies, subscriptions, etc.
Location & Filing
After-Tax Income
$55,960
Total tax burden: $19,040 — 25.4% effective rate
Tax Breakdown
Your Deductions
Estimated tax savings from deductions: $2,188
2026 Quarterly Estimated Payments
Q1 (Jan–Mar)
$4,760
Due April 15, 2026
Q2 (Apr–May)
$4,760
Due June 16, 2026
Q3 (Jun–Aug)
$4,760
Due September 15, 2026
Q4 (Sep–Dec)
$4,760
Due January 15, 2027
Set aside $1,587/month to be ready for each payment.
$11,925 taxable in this bracket
$36,550 taxable in this bracket
$480 taxable in this bracket
Frequently Asked Questions
Do I need to pay both federal and state SE taxes?
Self-employment tax (SE tax) is a federal tax — there is no state-level self-employment tax. However, most states tax your self-employment income as ordinary income under their regular income tax. Nine states have no income tax at all. The total tax burden shown in this calculator includes both federal SE tax and your state's income tax on self-employment income.
Do state deductions work the same as federal?
Many states follow federal treatment for common deductions like business expenses and SE tax deductions, but not all. Some states don't allow the home office deduction, and state retirement contribution limits or health insurance deduction rules may differ from federal. This calculator applies federal deduction rules, which are a good approximation for most states — consult a local tax professional for state-specific deduction limits.
Illinois Taxes — Frequently Asked Questions
Does Illinois have state income tax in 2026?
Yes. Illinois applies a flat 4.95% state income tax. On a $80,000 salary that works out to $3,960 in state tax for 2026, on top of $8,972 federal income tax and $6,120 FICA.
How much is $80,000 after taxes in Illinois?
A single filer earning $80,000 in Illinois takes home approximately $60,948 per year — about $5,079/month or $2,344 per biweekly paycheck. Total taxes: $19,052 (23.82% effective rate), split between federal income tax ($8,972), FICA ($6,120), and Illinois state tax ($3,960).
How much is $110,000 after taxes in Illinois?
On a $110,000 salary in Illinois, a single filer keeps approximately $80,568 per year ($6,714/month). The overall effective tax rate is 26.76%, of which $5,445 is Illinois state income tax.
What is the Illinois state tax on a $60,000 salary?
Approximately $2,970 for 2026 (single filer). Combined with $5,030 federal income tax and $4,590 FICA, total deductions reach $12,590 and take-home pay is $47,411.
What percentage of my paycheck goes to taxes in Illinois?
Between 20.98% and 26.76% for salaries in the $60,000–$110,000 range (single filer, 2026 rates). The biggest pieces are federal income tax and 7.65% FICA; Illinois state tax adds roughly 4.95% at $80,000. Use the self-employed tax calculator above for your exact numbers.