The due date is the last date on which an installment or payment is due, according to the product's terms and conditions.
Steps
For example, with a credit card, this differs from a statement date; the statement is issued first, and the payment due date follows.
Set a reminder two days or more before the due date and ensure you have sufficient funds available, as late payments may incur fees, interest, or a credit penalty.
The figures, fees and limits in this answer vary by bank and change over time — confirm them with your bank or the official source before acting.