NIM and spread are the two key parameters that give an indication of a bank's operational efficiency. As a concept, NIM and spread are similar, but there is a subtle difference between the two. While NIM is arrived at by dividing a bank's net interest income by its average interest-earning assets, spread is the margin between the yield on assets and the cost of liabilities, or the difference between interest income and interest expense as a percentage of assets. NIM can be higher or lower than the net interest spread.
