The payments you make on your credit card will be applied firstly to any monthly instalment(s) due for an instalment plan, followed by the balances that make up your closing balance on your most recent statement, from those attracting the highest interest rate to the lowest interest rate.
Payments are then applied to balances that have not yet appeared on your statement in a similar fashion.
As the promotional interest rate offered for balance transfers is generally low, and may be 0%, you should assume that any payments will be applied to your other balances before they begin to reduce your transferred balance.
In most cases we will apply any payments to your other balances before they begin to reduce your transferred balance, except where you have agreed with us for a payment to be applied to a particular balance.