All states

Illinois

Flat rate
Filing status
Income
Pre-tax adjustments
Itemized deductions
Household

Estimated taxes

Tax year 2025
Gross income$0
Total tax$0
Take-home pay$0

Overall effective rate: 0.0%

Federal

Adjusted gross income
$0
Standard deduction
$15,000
Taxable income
$0
Tax before credits
$0
Credits
- $0
Federal income tax
$0
Effective / marginal rate
0.0% / 0.0%

FICA

Social Security
$0
Medicare
$0
FICA total
$0

State — Illinois (IL)

State taxable income
$0
State income tax
$0
State + local tax
$0
Effective / marginal rate
0.0% / 0.0%

Notes

  • Illinois levies a single flat rate of 4.95% (2025) on Illinois net income — no brackets, same rate for every filing status and income level.
  • The tax base is FEDERAL AGI (IL-1040 line 1), not federal taxable income; Illinois does NOT allow the federal standard deduction or federal itemized deductions.
  • Personal exemption allowance of $2,850 per person (2025) for the taxpayer, the spouse (married filing jointly), and each dependent — this is the only subtraction modelled.
  • The exemption allowance is disallowed ENTIRELY (not gradually phased out) when federal AGI exceeds $500,000 (married filing jointly) or $250,000 (all other statuses).
  • Schedule M additions/subtractions (federally taxed Social Security, qualifying retirement income, U.S. government interest, etc.) are NOT modelled because the shared input has no fields for them; Illinois fully exempts most retirement income, so real liabilities for retirees may be lower.
  • The extra $1,000 exemptions for taxpayers age 65+ or legally blind are NOT modelled because the shared input carries no age or blindness fields.

Sources

Disclaimer: This is an informational estimate for the 2025 tax year only and is provided on a best-effort basis. It is not tax, legal, investment, or financial advice. Results are approximate, may be inaccurate or out of date, and may not reflect all credits, deductions, phase-outs, or local rules. This site assumes no liability for any decisions made or outcomes resulting from its use. Consult a qualified tax professional before filing or making any decisions.