Illinois tax planning for 1099 workers
Illinois is represented as a flat-rate state in this comparison. The supplied 2026 figure is 4.95% on state taxable income, with a personal exemption of $2,925 for a single filer or $5,850 for married joint. Unlike a graduated schedule, a flat rate makes the state line easier to follow, but the exemption still affects the taxable base used by this simplified model.
The federal side is not a second state approximation. It calls the shared federal bracket function and the shared self-employment tax function already used by the site's other calculators. Together they show federal income tax plus self-employment tax, and the Illinois estimate is added afterward. No local tax, credit, itemized deduction, or business-specific adjustment is invented here.
Net profit is the key starting point for a 1099 worker. Track revenue and ordinary business costs throughout the year, then use the Quarterly Tax Calculator to plan federal estimated payments. This page should not be used to determine a final Illinois return or a multi-state allocation.
Use the Illinois preselected comparison calculator for an interactive result. The main state comparison shows how Illinois compares with the other nine supplied states at the same profit level.
State tax filing can depend on facts this page does not ask for. Consult a tax professional before relying on the estimate for business, residence, or payment decisions.