County Property Tax Prepayment Option

So far, following counties are known to allow prepayments:

Cook, DuPage, Grundy, Kane, LaSalle and Will.

Cook first installment only; can be paid online – bills already available online. Also by mail (postmarked by 12/31/2017) or at any Chase Bank branch in Illinois.

DuPage and Grundy can be paid in person or by mail (postmarked by 12/31/2017)

Grundy up to 100% of amount paid in 2017 taxes for 2016 taxes.
DuPage up to 105% of amount paid in 2017 for 2016 taxes.

Kane can be paid in person or by mail, but it must be RECEIVED by 4:00 PM on 12/29/2017 even if by mail.

Kane up to 100% of amount paid in 2017 taxes for 2016 taxes rounded down to the nearest $100. Also must use the Application for Kane County Property Tax Prepayment Program form available online.

LaSalle and Will county in person only by 12/29/2017. Up to 100% of amount paid in 2017 for 2016 taxes.

Kendall County is not allowing prepayment.