How to pay St. Clair County, IL property tax
✓ Verified — Last verified October 24, 2026
Payment details from the official sources for St. Clair County. Check the tax year and parcel on your bill before submitting a payment.
Pay on the official siteNot tax or legal advice; confirm with your county.
Payment methods and fees
Published fees
The online processor lists credit-card fees of 2.5% or a $2 minimum and an ACH electronic-check fee of $1.50. Fees are retained by the processor.
Official source. Verified .
Published installment dates
Tax year 2025. Dates retain the year published by the source.
Published late-payment rule
35 ILCS 200/21-15: monthly interest is 1.5% in counties below 3 million population; in counties of 3 million or more, 0.75% for tax years 2023 onward.
Official source. Statutory. Verified .
Official offices
St. Clair County Treasurer’s Office
Sources for these instructions
https://www.stclaircountyil.gov/Departments/Treasurer
Pay Real Estate & Mobile Home Tax Bills
Verified October 24, 2026
https://www.stclaircountyil.gov/departments/treasurer/faq
Credit Card and electronic check payments may be made on-line.
Verified October 24, 2026
https://payments.municipay.com/il_stclair/page/terms
Visa, MasterCard, Discover, American Express -Convenience Fee =2.5% or $2.00 minimum ACH (Electronic Check) Convenience Fee =$1.50. Fees are not collected by the County Treasurer; the processor retains the fees.
Verified October 24, 2026
Continue with your property
Common questions
Where can I pay St. Clair County property tax?
Official payment portal: https://payments.municipay.com/il_stclair/search. Online credit card, Online electronic check
Updated , from cited verification dates. Individual sources may have earlier checks.