The revised way of calculating interest on purchases will affect you differently depending on your own personal circumstance.
(a) For those who pay their closing balance in full every month:
If you continue to pay off your closing balance in full every month by the due date you will not be directly impacted, and you will continue to pay no interest on purchases.
(b) For those currently paying interest on existing purchase:
These changes will not immediately impact you as nothing will change until you have paid your closing balance in full and regain the interest-free days.
(c) For those who generally pay their closing balance in full but sometimes miss a full payment and pay interest on purchases:
From 1 June 2019, if you do not pay off your closing balance in full by the payment due date you will start incurring interest from the next day. Once the most recent closing statement balance or current balance plus interest is paid off in full, the interest-free period will resume from your next retail purchase.