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Sheet IL · 2026 rules

Illinois Property Tax Calculator

Illinois DOR states that no single property-tax rate applies statewide. Bills depend on equalized assessed value and the money local taxing districts need. Most property is assessed at 33⅓% of fair market value; Cook County instead uses property classes, including a 10% residential assessment level.

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Rules verified 19 primary sources Editorial policy

Estimate your 2026 Illinois bill

Approved shared exemption, bill credits and charges (optional)

The same assessed-value amount must apply to Local ad valorem levies. Different approvals or bases require the prepared levy worksheet. Do not repeat relief already deducted.

Use the assessing authority’s value, recorded classification and current rates. Worked examples use hypothetical rates unless labeled statutory.

Illinois · 2026 residential assessment worksheet Needs inputs
Illinois estimated annual property tax —
  • Tax — Local ad valorem levies —
  • Credits subtracted —
  • Fixed charges added —
Per month (annual ÷ 12) —
What was applied Enter the assessor’s residential full value from the assessment notice.
Assessed value after ratio and cap —
Taxable value — Local ad valorem levies —
Effective rate on market value —

What this estimate leaves out

How Illinois turns value into a tax bill

Illinois statewide rules
StepIllinois ruleSource
Value Use the valuation for the assessment year shown on your notice. Exemptions, rate units and levy classifications below must match that same notice. [1]
Assessment Choose the actual approved property class: approval required; Ordinary 33⅓% raw assessment: 33.3333%; Cook County 10% residential raw assessment: 10%; Already equalized assessed value (enter EAV directly): 100%Then apply the actual equalization multiplier entered for this assessment. [1]
Annual limit No automatic parcel bill cap is inferred from a limit on a jurisdiction’s total levy.
Exemptions Other relief is applied only from a recorded approval; the calculator does not decide qualification.
Rate Local ad valorem levies: local rate — you enter it.Local ad valorem levies from the applicable taxing authority. The rate is not a Census ratio.

How Illinois assesses, equalizes, exempts and collects residential tax

Illinois has no set property tax rate: a bill depends on the property's equalized assessed value (EAV) and the money its local taxing districts need.1 Property is assessed with reference to what is owned on January 1 of the assessment year.2 Outside counties of more than 200,000 inhabitants that classify property, each tract is valued at 33 1/3% of fair cash value.3 Cook County classifies instead, with levels from 10 percent of market value for residential property to 25 percent for commercial.1

General assessments are not annual. In counties under 3,000,000 inhabitants with township government, general assessment years are 1995 and every fourth year thereafter; commission-form counties use 1994 and every fourth year.4 Cook County is split into three districts, each reassessed every 3 years (the first district from 1997, the second from 1998, the third from 1996).5

The Department of Revenue raises or lowers each county's total so property ends up assessed at 33 1/3% of fair cash value.6 EAV is the assessed value multiplied by that state equalization factor, and the tax rate is applied after qualified homestead exemptions are deducted.7 Rates are normally expressed in dollars per $100 of EAV.7 For Cook County's 2025 assessments, the Department announced a tentative factor of 2.86838 and a final factor of 3.0300.9

The general homestead exemption cuts EAV by the increase over the home's 1977 EAV, up to $10,000 in Cook County, $8,000 in counties contiguous to Cook and $6,000 elsewhere, for taxable years 2023 and after.1011 Owners 65 or older get a further senior homestead exemption of up to $8,000 in Cook and contiguous counties and $5,000 elsewhere.12 The Low-Income Senior Citizens Assessment Freeze holds EAV at its base-year level11 for household incomes up to $75,000 in taxable year 2026, $77,000 in 2027 and $79,000 from 2028.13

Veterans with a service-connected disability of at least 30% but under 50% get a $2,500 EAV reduction, and those at 50% to under 70% get $5,000.11 At 70% or more, the first $250,000 of EAV is exempt.14 The exemption for persons with disabilities is $2,000 of EAV a year.11 Separately, the state income tax allows a credit of 5% of property tax paid on a principal residence19, unavailable above adjusted gross income of $500,000 for joint filers or $250,000 for others.19

To appeal outside Cook County, file a complaint with the county board of review within 30 calendar days after the assessment list is published.15 Cook County's board publishes filing dates township by township and must allow at least 20 days after each notice.16 A board of review decision can go to the Property Tax Appeal Board; outside Cook the deadline is 30 days after written notice of the decision.17

In most counties tax is paid in two installments, usually June 1 and September 1.1 Counties using accelerated billing, including Cook, bill a first installment of 55 percent of last year's tax, due by March 1 in Cook.1 Late tax bears interest of 1 1/2% per month outside Cook18 and 0.75% per month in Cook for tax year 2023 onward.18 The tax-cap law (PTELL) limits districts' total extensions, not individual bills or assessments.11

Worked example

Assessed value: $300,000 x 10% = $30,000. EAV: $30,000 x 3.0300 = $90,900. Less general homestead exemption (Cook maximum, assuming the home's EAV is at least $10,000 above its 1977 EAV): $90,900 - $10,000 = $80,900 taxable EAV. Tax: $80,900 x $7.50 / $100 = $6,067.50. Senior variant (owner 65+, Cook maximum $8,000 senior exemption): $80,900 - $8,000 = $72,900; $72,900 x $7.50 / $100 = $5,467.50.

Illinois worked example
LineTaxable valueTax
Local ad valorem levies at $7.50 per $100$80,900.00$6,067.50
Annual total$6,067.50

Left to your local bill

Census context, not a rate

American Community Survey 2020–2024: median owner-occupied value $263,300 (±$797), median real-estate taxes $5,298 (±$22). Dividing one by the other gives 2.01% for Illinois. Tables B25077 and B25103; why it is only context.

Sources

  1. tax.illinois.govIllinois Department of Revenue, Taxpayer Answer Center: property tax rates and payment, read .
    “There is no set rate for property tax in Illinois. Your tax bill is based on two factors, the equalized assessed value (EAV) of your property, and the amount of money your local taxing districts need to operate during the coming year. … Cook County uses a different system that assigns assessment levels to different classes of property. Assessment levels range from 10 percent of market value for residential property to 25 percent of market value for commercial property.”
  2. ilga.gov35 ILCS 200/9-95, read .
    “with reference to the amount owned on January 1 in the year for which it is assessed, including all property purchased that day.”
  3. ilga.gov35 ILCS 200/9-145, read .
    “Except in counties with more than 200,000 inhabitants which classify property for purposes of taxation, property shall be valued as follows: (a) Each tract or lot of property shall be valued at 33 1/3% of its fair cash value.”
  4. ilga.gov35 ILCS 200/9-215, read .
    “in counties having the township form of government and with less than 3,000,000 inhabitants, the general assessment years shall be 1995 and every fourth year thereafter. In counties having the commission form of government and less than 3,000,000 inhabitants, the general assessment years shall be 19”
  5. ilga.gov35 ILCS 200/9-220, read .
    “(1) The first assessment district shall be subject to general reassessment in 1997 and every 3 years thereafter. (2) The second assessment district shall be subject to general reassessment in 1998 and every 3 years thereafter. (3) The third assessment district shall be subject to general reassessmen”
  6. ilga.gov35 ILCS 200/17-5, read .
    “so that the property will be assessed at 33 1/3% of its fair cash value.”
  7. tax.illinois.govIllinois Department of Revenue, PTAX-1-A Introduction to Residential Assessment, read .
    “Equalized Assessed Value (EAV) - the assessed value multiplied by the State equalization factor. This gives the property value from which the tax rate is calculated after deducting all qualified homestead exemptions. … Tax rates are normally expressed in dollars per $100 of EAV.”
  8. tax.illinois.govIllinois Department of Revenue news: 2025 Cook County Tentative Multiplier Announced, read .
    “A tentative 2025 property tax equalization factor of 2.8683 for Cook County was announced today by the Illinois Department of Revenue.”
  9. tax.illinois.govIllinois Department of Revenue news: 2025 Cook County Final Multiplier Announced, read .
    “A final 2025 property tax equalization factor of 3.0300 for Cook County was announced by the Illinois Department of Revenue.”
  10. ilga.gov35 ILCS 200/15-175, read .
    “For taxable years 2023 and thereafter, the maximum reduction is $10,000 in counties with 3,000,000 or more inhabitants, $8,000 in counties that are contiguous to a county of 3,000,000 or more inhabitants, and $6,000 in all other counties.”
  11. tax.illinois.govIllinois Department of Revenue, Property Tax Relief, read .
    “The amount of exemption is the increase in the current year's equalized assessed value (EAV), above the 1977 EAV, up to a maximum of $10,000 in Cook County, $8,000 in counties contiguous to Cook County, and $6,000 in all other counties. … This exemption "freezes" the senior citizen's property's equalized assessed value the year that the senior citizen qualifies for the exemption.”
  12. ilga.gov35 ILCS 200/15-170, read .
    “For taxable years 2023 and thereafter, the maximum reduction is $8,000 in counties with 3,000,000 or more inhabitants and counties that are contiguous to a county of 3,000,000 or more inhabitants and $5,000 in all other counties.”
  13. ilga.gov35 ILCS 200/15-172, read .
    “(8) for taxable year 2026, $75,000 for all qualified property; (9) for taxable year 2027, $77,000 for all qualified property; and (10) for taxable years 2028 and thereafter, $79,000 for all qualified property.”
  14. ilga.gov35 ILCS 200/15-169(b-3.1), read .
    “then the first $250,000 in equalized assessed value of the property is exempt from taxation under this Code”
  15. ilga.gov35 ILCS 200/16-55(d), read .
    “A complaint to affect the assessment for the current year shall be filed on or before 30 calendar days after the date of publication of the assessment list under Section 12-10.”
  16. ilga.gov35 ILCS 200/16-110, read .
    “Taxpayers shall have at least 20 days after the date of publication of the notice within which to file complaints.”
  17. ilga.gov35 ILCS 200/16-160, read .
    “(i) in counties with less than 3,000,000 inhabitants within 30 days after the date of written notice of the decision of the board of review”
  18. ilga.gov35 ILCS 200/21-15, read .
    “For property located in a county with fewer than 3,000,000 inhabitants, the unpaid taxes shall bear interest at the rate of 1 1/2% per month or portion thereof. … or (ii) 0.75% per month, or portion thereof, if the unpaid taxes are for tax year 2023 or any tax year thereafter.”
  19. ilga.gov35 ILCS 5/208, read .
    “every individual taxpayer shall be entitled to a tax credit equal to 5% of real property taxes paid by such taxpayer during the taxable year on the principal residence of the taxpayer. … no taxpayer may claim a credit under this Section if the taxpayer's adjusted gross income for the taxable year exceeds (i) $500,000, in the case of spouses filing a joint federal tax return, or (ii) $250,000, in the case of all other taxpayers.”

Bordering jurisdictions

Rules verified by the Property Tax Calculator Editorial Team. Report a correction