Illinois Freelancer Taxes 2026: IL-1040-ES Estimates and the PPRT
Illinois is one of the easier states to model as a freelancer because the income tax rate never changes with income: 4.95% on everything. What catches people out is the state quarterly form, the lack of a state standard deduction, and the 1.5% Personal Property Replacement Tax that hits partnerships and S-corps but not sole proprietors. Run the numbers alongside this guide with the [Illinois self-employed tax calculator](https://gigmytax.com/calculators/illinois-self-employed-tax).
How the flat 4.95% actually applies
Illinois starts from federal adjusted gross income, subtracts a personal exemption rather than a standard deduction, and taxes the remainder at 4.95%. That means a Chicago freelancer with $50,000 of net profit pays roughly $2,400 of state tax — small next to a $7,065 self-employment tax bill, but not optional. Every federal Schedule C deduction you take also reduces the Illinois base, so mileage and home office work double duty.
IL-1040-ES: the state instalment schedule
If you expect to owe more than $1,000 of Illinois tax, the state wants four instalments on IL-1040-ES, due 15 April, 15 June, 15 September and 15 January. Pay through MyTax Illinois for an instant receipt. Illinois charges penalty interest on late instalments even when the annual return shows a refund, so the timing matters as much as the total.
Safe harbour
Paying 100% of the prior year's Illinois liability in four equal instalments protects you regardless of how the current year turns out.
Uneven income
Sellers and creators with a huge fourth quarter can annualise instead of paying flat quarters, matching payments to when the income actually arrived.
The Personal Property Replacement Tax, decoded
The PPRT is an entity-level Illinois tax: 1.5% of net income for partnerships, S-corps and trusts, and 2.5% for traditional corporations. Sole proprietors filing a Schedule C do not pay it. This is the one Illinois item that can make an LLC taxed as a partnership more expensive than a simple sole proprietorship at the same profit level.
Who files
Partnerships file IL-1065 and S-corps file IL-1120-ST, both computing PPRT on Illinois-apportioned income.
Single-member LLC relief
A single-member LLC that has not elected corporate treatment is disregarded for federal purposes and generally avoids PPRT, filing on the owner's IL-1040 instead.
Chicago-specific costs freelancers forget
Chicago has no city income tax, but it does have other charges that show up on a freelancer's books.
Business licences
A limited business licence is a common requirement for home-based operations; the fee is a deductible business expense.
Personal property lease transaction tax
Chicago applies a lease transaction tax to certain software and equipment rentals, which often quietly appears on SaaS invoices. Deduct the full invoiced amount.
Parking and tolls
Fully deductible for business trips, and separate from the standard mileage rate — mileage does not absorb tolls or parking.
Worked example: $64,000 of Illinois net profit
A Naperville freelance developer grosses $78,000 and deducts $14,000 (software $2,600, home office $1,500, mileage 4,300 miles at $0.70 = $3,010, phone and internet $1,700, insurance $1,100, equipment $2,200, professional fees $1,890). Net profit $64,000. SE tax on 92.35% ($59,104) is about $9,043, half deductible. Federal taxable income after the $16,100 standard deduction is roughly $43,378, producing about $4,970 of federal income tax. Illinois tax at 4.95% on roughly $57,000 is about $2,822. Total near $16,835, so instalments run about $4,209 a quarter split between 1040-ES and IL-1040-ES.
A three-step Illinois routine
First, set aside 26% of every deposit — that covers the federal and Illinois combination for most mid-income freelancers. Second, log mileage the day you drive; Illinois audits piggyback on federal adjustments, so a weak log costs you twice. Third, on each quarterly date, pay federal and state in the same sitting from the same spreadsheet line. The people who owe penalties in Illinois are almost never the ones who forgot the federal payment.
Frequently asked questions
+What is the Illinois income tax rate for self-employed people?
A flat 4.95% on Illinois taxable income, regardless of how much you earn. There is no graduated rate and no local income tax in most of the state.
+Do Illinois freelancers file state quarterly estimates?
Yes, on Form IL-1040-ES, when expected Illinois tax exceeds $1,000. The four due dates mirror the federal 1040-ES calendar.
+Does a sole proprietor pay the Personal Property Replacement Tax?
No. PPRT applies to partnerships, S-corps, trusts and corporations. A Schedule C sole proprietor and most single-member LLCs are outside it.
+Does Chicago have a city income tax on freelance work?
No. Chicago levies no personal income tax, though licence fees and the lease transaction tax on some software and equipment can apply.
+Does Illinois have a standard deduction?
No. Illinois uses a personal exemption instead, which is why state taxable income is often higher than federal taxable income.
+How much should an Illinois 1099 worker set aside?
Roughly 24% to 29% of net profit covers federal income tax, the 15.3% self-employment tax and the flat 4.95% Illinois tax.
About the author
Javed Niamat · Founder & Editor, GigTax
Javed Niamat founded GigTax to make self-employment tax math understandable for rideshare drivers, delivery couriers, creators and freelancers. He builds and maintains every calculator on this site and writes the guides that explain the numbers behind them.
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- Illinois Self-Employed Taxes: The Complete 2026 GuideHow Illinois self-employed taxes work in 2026: flat 4.95% state income tax, PPRT, federal + SE, quarterly payments, deductions, and a free calculator.
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