26-35-501. Time to pay

(1)  A county collector shall assess a penalty of ten percent (10%) against all unpaid tax balances remaining after October 15 for every taxpayer other than a utility or carrier or after the prescribed dates listed in subsection (b) of this section for utilities and carriers.
(2)  (A)  A taxpayer paying in installments under subdivision (a)(2) of this section shall not be assessed a penalty until the taxes become due and remain unpaid after October 15. (B)  However, if the last day for the payment of taxes on any installment is a Saturday, Sunday, or postal holiday, the last day to pay taxes without a penalty is the following business day.
(3)  (A)  A property tax balance payment is timely received under this subsection if mailed through the United States Postal Service and postmarked by October 15. (B)  If October 15 is a Saturday, Sunday, or postal holiday, a property tax balance payment is timely received if mailed and postmarked through the United States Postal Service the following business day.