In practice, yes, though not through a formal plan. The Cook County Treasurer says state law does not allow formal payment plans, but its office accepts partial payments, so you can pay as your budget allows. It offers a payment plan calculator on cookcountytreasurer.com to help you set monthly or biweekly amounts.
Partial payments are accepted online, by mail and at Chase branches. Paying online from a bank account is free; card payments carry a 2.08% third-party fee.
What partial payments do not do is move the due date. Any balance unpaid after the due date accrues interest of 0.75% a month, and delinquent taxes can be offered at the Treasurer's annual tax sale (see the Cook County tax sale). Paying down early, before the due date, is what avoids the interest.
If your mortgage has an escrow account, your lender pays the bill from it; the monthly amount is built into your mortgage payment. The Tax Year 2025 second installment is due Thursday, October 1, 2026. More on each way to pay: how to pay Cook County property taxes.