Interest after prepayment of mortgage loan is calculated according to the time and method of prepayment. Generally speaking, prepayment will generate two kinds of interest: one is the interest that has been generated but has not been paid, and the other is the interest within the remaining period after prepayment.

The specific calculation method is as follows:

1. Interest generated but not paid: calculate the interest payable in each installment according to the interest rate and repayment method agreed in the loan contract, and then add up the past but not paid installment interest.

2. Interest within the remaining period: calculate the interest payable in each period within the remaining period according to the remaining principal after prepayment and the interest rate agreed in the loan contract, and then add up the interest within the remaining period.

It should be noted that different banks and loan contracts may have different calculation methods and regulations, so it is best to consult banks or check the relevant clauses in loan contracts in actual operation to ensure accurate calculation.

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