Yes, a postmark showing the due date is acceptable to avoid late penalty. Checks are preferred. Your cancelled check is your receipt. Payment is void if made by a check which fails to clear the bank. The County Collector cannot accept partial payments and they will be returned .
Installments are due on or before due dates shown on tax bill.
September 7 for the second installment. A penalty is effective after due dates pursuant to State Statues. Parts or fractions of a month shall be considered a month. Additional costs may be incurred after the second installment due date. All payments made after second installment due date must include interest penalty and should be paid at the County Collectors office.