Illinois is a flat 4.95%
The Illinois Department of Revenue’s 2026 IL-700-T states: “Effective January 1, 2026, Tax Rate 4.95%” and “the exemption allowance is $2,925.”
This page annualizes that published formula:
tax = 0.0495 × max(0, Illinois income − Line 1 exemptions × $2,925)
It is a first-look estimate, not a completed IL-1040. Federal income tax is separate.
$52,000, one Line 1 exemption
taxable = 52,000 − 2,925 = 49,075 tax = 49,075 × 0.0495 = 2,429.21
Worked examples
| IL income | Line 1 | Exemption | Tax |
|---|---|---|---|
| $52,000 | 0 | $0 | $2,574.00 |
| $52,000 | 1 | $2,925 | $2,429.21 |
| $80,000 | 2 | $5,850 | $3,670.43 |
| $2,000 | 1 | $2,925 | $0.00 |
What this page leaves out
| Topic | Here? |
|---|---|
| IL-W-4 Line 2 allowances ($1,000 each) | No |
| Retirement / Social Security subtraction | No |
| Property-tax credit | No |
| Federal income tax / FICA | No — separate tools |
Related: effective federal tax rate, paycheck take-home, FICA.
Educational estimate
IDOR IL-700-T withholding arithmetic, annualized. Not a filed IL-1040 and not tax advice.