How are property tax rates determined in Illinois?

Property tax rates in Illinois are set by each taxing district (municipality, school district, park district, library, etc.) based on their annual levy (the amount of tax revenue they need). The rate is calculated by dividing the levy by the total assessed value of all property in the district.

What is the composite tax rate?

The composite tax rate is the sum of all overlapping taxing district rates that apply to a specific property. A typical property may be taxed by several overlapping districts. The composite rate determines your total tax bill when multiplied by your property's assessed value.

Why do tax rates vary within the same town?

Properties within the same municipality can have different composite rates because overlapping districts (school, park, fire, library) have different boundaries. A home in one school district may have a different rate than a home two blocks away in a different school district.

Old Mill Creek, IL Property Tax Rate 2026 — Full Breakdown by District

CSAChicago-Naperville MSAChicago-Naperville-Elgin#58/341 Home Value

Showing latest tax year with year-over-year changes. Full rate history available with a paid plan. View plans →

Property Tax — Tax Year 2024 (payable 2025)i

IL DOR

Composite Ratei

8.62%–9.45%-5.5%YoY

Varies by school district

Municipal Portioni

0.2656%-8.8%YoY2.9% of total

Effective Ratei

2.87%–3.15%

Est. Annual Taxi

$13K–$14K

Median Home Valuei

$450,000

Total Leviedi

$641.8M

Tax Per Capitai

$195

Municipal Revenuei

$28K20.1% of total rev

Rate varies by school district. Your actual rate depends on which school district your property falls in.

Rate Trend — click a year to explorei

20232024

Municipal

Other Districts

Where Your Tax Dollar Goesi

$0.49 E 24 (Lake)

$0.48 E 3 (Lake)

$0.46 E 50 (Lake)

$0.46 E 34 (Lake)

$0.36 H 126

$0.31 H 121

$0.30 H 117

$0.09 Lake Co

$0.03 Jc 532

$0.03 Old Mill Creek

$0.03 Newport Twp

$0.02 Lake Co Fst Prsv Dist

Estimated Tax by Home Valuei

$200K

$5,744–$6,301

$300K

$8,615–$9,451

$400K

$11,487–$12,601

$500K

$14,359–$15,752

$600K

$17,231–$18,902

$700K

$20,102–$22,053

$800K

$22,974–$25,203

Highlighted value is closest to median home value ($450K)

12 Overlapping Taxing Districtsi

E 24 (Lake)Elementaryi

49.5%4.4749%

$14.0M levied

E 3 (Lake)Elementaryi

47.6%4.2965%

$21.8M levied

E 50 (Lake)Elementaryi

46.2%4.1733%

$86.7M levied

E 34 (Lake)Elementaryi

45.6%4.1197%

$35.7M levied

H 126High Schooli

35.6%3.2174%

$31.9M levied

H 121High Schooli

30.7%2.7693%

$76.2M levied

H 117High Schooli

30.3%2.7368%

$46.1M levied

Lake Coi

9%0.8129%

$185.7M levied

Jc 532Community Collegei

3.1%0.2802%

$89.1M levied

Old Mill Creeki

2.9%0.2656%

$28K levied

Newport Twpi

2.6%0.2383%

$686K levied

Lake Co Fst Prsv Disti

1.8%0.1616%

$53.9M levied