Illinois SALT Cap Calculator ($40,000 OBBBA)
Enter your MAGI and total state + local taxes below. The estimate applies the OBBBA cap and phase-out line by line — no tax software, no signup.
The short answer: Krystle — at the scenario numbers pre-loaded below, the OBBBA deduction is $11,000, worth about $2,420 in federal income tax at a 22% marginal rate ($93 per biweekly paycheck). Exact figures update live as you change the inputs.
⚠️ This calculator provides estimates for informational and educational purposes only. It is not tax advice. Results are based on the One Big Beautiful Bill Act (OBBBA) and IRS Schedule 1-A. Consult a qualified tax professional for your specific situation.
Your State's Slice of the $40,000 Cap
Illinois' flat 4.95% income tax plus heavy Cook County property assessments land many households in the $18-25k SALT range — squarely inside the new cap's sweet spot. Chicago's high property tax bills arrive twice a year, making timing easy to track. The Chicago teacher pension offset on returns is a state credit, not a SALT item, and does not belong in this input.
The full rules, caps and phase-outs for every deduction are in one table on the OBBBA rules page.
Worked Example
Krystle pays $9,500 flat-tax Illinois income tax and $11,500 Cook County property tax.
- • Deductible amount: $11,000
- • Federal income tax savings: $2,420 (at the 22% marginal rate)
- • Per biweekly paycheck: $93
Your actual state tax bill sets the input; the cap and phase-out above set the ceiling — the calculator reconciles both.
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Frequently Asked Questions
Do Illinois and Cook County taxes both count?
Yes — the flat state income tax and your county property tax bill both count toward the same SALT total, and the combined figure is what the $40,000 cap tests.
Which taxes count toward the SALT deduction?
State and local income taxes (or sales tax if you elect that instead) plus real property taxes, up to the OBBBA cap after any income phase-out. Federal taxes never count.