Illinois Contractor Tax Guide
Verified current statutory flat rate as of 2026-09-23.
Combined Social Security and Medicare tax (Self-Employment).
Progressive marginal rates, applied separately to taxable income.
How 1099 Taxes Work in Illinois
As a freelancer, consultant, or gig worker in Illinois, you are technically your own employer. This means you aren't subject to standard W-2 withholding from a "boss." Instead, you must manually track your earnings and determine federal and any applicable state obligations. Check the Illinois Department of Revenue for state-specific rules.
Illinois-Specific Considerations
Business Entity Tax
Illinois charges a flat 4.95% individual income tax on your net self-employment profit, reported on Form IL-1040, after a personal exemption allowance ($2,925 for 2026). If you keep your LLC as a default single-member disregarded entity, you're exempt from the separate 1.5% Personal Property Replacement Tax (PPRT) — that only applies if you elect partnership, S-corp, or C-corp taxation. A $75 LLC-50.1 annual report is still due to the Secretary of State.
Local Income Tax
None. Illinois does not allow cities or counties to levy income tax.
Filing & Estimated Payments
Individual returns use Form IL-1040. Illinois follows the federal schedule exactly — April 15, June 15, September 15, and January 15 — filed with Form IL-1040-ES, required once you expect to owe more than $1,000 in Illinois tax for the year.
Worth Knowing
Illinois has no standard deduction, but every filer gets a personal exemption allowance ($2,925 in 2026, adjusted for inflation each year) that directly reduces taxable income — worth remembering since it's easy to assume a flat-tax state has no deductions at all.
Worked Example: $75,000 Illinois Contractor
On $75k of net 1099 profit (single filer, no deductions), the calculator estimates $6,504 in federal income tax, $10,597 in self-employment tax, and $2,653 in state tax — leaving about $55,245 take-home.
Sources: Illinois Dept. of Revenue — IL-1040-ES, Illinois Dept. of Revenue — Personal Property Replacement Tax, Illinois Secretary of State — LLC Annual Report
Quarterly Estimated Payments
Federal estimated payments generally apply when you expect to owe at least $1,000, subject to withholding and safe-harbor rules. Typical federal due dates are below; weekends and holidays can shift them. January is in the following year. State requirements vary:
Deductions and Expenses in Illinois
The single best way to lower your tax bill in Illinois is to optimize your business deductions. Common expenses you can subtract from your gross income include:
Home Office
A proportional amount of rent or mortgage for your dedicated workspace.
Software & Tools
Subscriptions, laptops, and professional design or dev tools.
Travel & Auto
Mileage driven for client meetings or local hardware purchases.
Internet & Phone
The percentage of your utility bills used primarily for business.
Official Illinois Tax Resources
Illinois Department of Revenue
Visit the official state portal to download forms, pay online, or contact support.
Calculate Your Net Pay
Ready to see an estimate of how much you'll keep after Illinois taxes? Try our free take-home estimator.
Open CalculatorDoes Illinois tax income?
Illinois has a flat income tax: everyone pays the same 4.95% rate regardless of income level. Our estimator uses this statutory rate directly.