Equal principal repayment saves interest than equal principal and interest repayment, but you will need to pay back some more money initially. It is precisely because part of the principal is exchanged first that part of the interest will be paid back less. The loan is RMB 180,000 with a term of 15 years. The difference between the two repayment methods is as follows: It can be seen that RMB 3,545.93 in interest is saved. But in the beginning, I had to pay back more than 200 yuan more every month.