1500 yuan. The loan is 500,000 yuan, with an annualized interest rate of 3.6%, which will be paid off in five years. The annual interest is 500,000× 3.6 =18000/12 =1500 yuan. Interest before interest means paying interest first and then paying the principal according to the repayment agreement. This repayment method is more suitable for individuals or enterprises with high cash flow pressure and a certain amount of money will be credited after a certain period of time.