2026 Property Tax Due Dates
Official SourceFirst installment (varies by county)
June 1
Second installment
September 1
Late Penalty
1.5% per month starting day after due
Payment Methods
Online, mail, in-person
St. Clair Treasurer
How to Pay St. Clair Property Taxes
💻
Online
Visit county treasurer website
📬
By Mail
Send check to county treasurer
🏢
In Person
Visit treasurer's office
Other Counties in Illinois
Related Resources
Get Deadline Reminders
We'll email you 2 weeks before your property taxes are due.