Afterpay is always interest free. There are no fees associated with the account as long as installments are paid on time, according to the payment schedule (provided at the time of order approval). If you are overdue a payment, Afterpay automatically applies a grace period, without you having to do anything. This means before a late fee is added, you are given a grace period (usually 10 days unless otherwise noted on the payment schedule) to make a payment before a late fee is assessed. Late fees are incurred if payment is not made within the disclosed grace period timeframe.
If paying the installment within the grace period, you will still receive an SMS stating that the payment failed, as well as a reminder about the payment due date. Although a grace period is provided this impacts the late fee assessment only, the Afterpay system reviews customer repayment history for future purchases, so we encourage payment of your installment as soon as possible.