During your promotional period 

You won’t need to pay any interest on your balance transfer amount. But interest can be applied to spending balances that you’re not paying off each month.  

After your promotional period  

If you haven’t cleared your balance transfer by the end of your promotional period, we’ll start applying interest to the amount you have left to repay each month.  

Interest on your spending balance will continue to be applied as normal.      

You can find more details about balance transfer fees in the credit card terms & conditions.