You will need to pay the closing balance of your account as it was on the last day of the previous calendar month in full, and once this is done your interest free eligibility will be regained and interest will stop accruing on any purchases that form part of your unpaid daily balance, from the date you make this payment (until your account ceases to be interest free eligible again). This can be done at any time during the month. Interest accrued up until the eligibility is regained will be charged at the end of the month.