You decide to transfer AED 1,000 to a 0% balance transfer card. Great ! You then make new purchases on the same card for AED 1,500.  You decide to pay in full your AED 1,500 purchase for the month thinking you have a 0% interest on your transferred balance and therefore no interest.  That is not correct.  Your AED 1,500 will be paid towards the AED 1,000 transferred balance and AED 500 on your current purchase and you will be charged interest on the remaining AED 1,000 balance.