NewDay starts charging interest when a transaction’s been made (including any applicable fees), until it’s been fully paid off. On an instalment plan, it’s from the date the plan is set up until it’s repaid in full. You are not charged interest on purchases (not including those made on an instalment plan) made during your last statement period if you repay your outstanding balance by the due date and if you repaid the previous month’s outstanding balance on time. NewDay charges interest on all fees, but not on default fees until at least the 29th day after they have told you about the default fee being charged. They work out interest daily and add it to your account on your monthly statement date.