2026 tax year · Illinois
Quarterly tax calculator for Illinois
A $50,000 1099 year in Illinois means about $2,190 to the IRS and $518 to the state, four times a year.
Switching state opens that state's page.
Line 24 of your prior 1040, unlocks the prior-year safe harbor.
Above $150,000 the prior-year target rises to 110%.
Enter what you expect to earn and press Calculate to see each payment.
The Illinois payment schedule on $50,000
A single filer with $50,000 of net 1099 profit, taking the standard deduction and paying 90% of this year's liability:
| Due | Income earned | To the IRS | To Illinois |
|---|---|---|---|
| April 15, 2026 | Jan 1 - Mar 31 | $2,190 | $518 |
| June 16, 2026 | Apr 1 - May 31 | $2,190 | $518 |
| September 15, 2026 | Jun 1 - Aug 31 | $2,190 | $518 |
| January 15, 2027 | Sep 1 - Dec 31 | $2,190 | $518 |
| Year | $8,759 | $2,070 | |
The Illinois side of each payment
Illinois taxes the same 1099 profit at a flat 4.95%, so a second payment goes to the state each quarter, about $518 on the $50,000 example, against $2,300 of Illinois income tax for the year.
The 2026 dataset carries the federal 1040-ES dates but not state-specific due dates, so confirm Illinois's schedule and voucher with its tax agency, several states do not match the federal calendar exactly.
What each quarter costs at three income levels in Illinois
A single filer taking the standard deduction, at three levels of net profit. The federal column moves with the self-employment tax and the federal brackets; the Illinois column moves with Illinois's own rules, so the two do not scale together. Use the calculator above for the other filing statuses:
| Net 1099 profit | Per quarter to the IRS | Per quarter to Illinois | Effective rate |
|---|---|---|---|
| $25,000 | $923 | $259 | 21.0% |
| $50,000 | $2,190 | $518 | 24.1% |
| $100,000 | $5,032 | $1,035 | 27.0% |
Staying inside the safe harbor
Payments are required once you expect to owe $1,000 or more, which the $50,000 example above does, at $12,032 for the year. Two targets avoid a penalty and you need only the lower; the hub explains both routes and the penalty.
What a quarter costs in the states Illinois borders
On $50,000, Illinois charges $2,475 of state income tax. Of the 5 states it borders, Indiana is the lightest at $1,475 and Wisconsin the most expensive at $2,263, a spread of $788 on the same income.
| State | State tax per quarter | vs Illinois |
|---|---|---|
| Indiana | $332 | −$225 a quarter |
| Kentucky | $394 | −$163 a quarter |
| Iowa | $428 | −$129 a quarter |
| Missouri | $502 | −$55 a quarter |
| Wisconsin | $509 | −$48 a quarter |
- Indiana would take $1,000 less, $1,475 against Illinois's $2,475.
- Kentucky would take $725 less, $1,750 against Illinois's $2,475.
- Iowa would take $575 less, $1,900 against Illinois's $2,475.
- Missouri would take $245 less, $2,230 against Illinois's $2,475.
- Wisconsin would take $212 less, $2,263 against Illinois's $2,475.
What this schedule assumes
- Single filer, standard deduction, net 1099 profit after expenses, no W-2 withholding.
- Four equal payments rather than annualised income.
- Illinois due dates are not in the 2026 dataset, the dates shown are the federal ones.
Illinois quarterly tax questions
How much should I send each quarter in Illinois?
On $50,000 of net 1099 profit as a single filer, about $2,190 to the IRS plus roughly $518 to Illinois. That is 90% of this year's liability, split four ways.
Does Illinois use the same due dates as the IRS?
Illinois requires its own estimated payments, but the 2026 dataset carries only the federal 1040-ES dates (April 15, 2026, June 16, 2026, September 15, 2026, January 15, 2027). Confirm Illinois's own schedule with its tax agency before assuming they line up.