Interest first and then principal is a loan method, equal principal and interest is another common loan method, and overdue and overdue advances are loan-related delayed repayments and temporary repayments.

Details are as follows:

1. Interest first is a loan method, which means that within a certain period, the borrower only needs to pay interest and does not repay the principal. This method is generally suitable for short-term loans, such as business loans or personal consumption loans, and the term is usually no more than one year. For borrowers, the advantage of interest first and principal later is that it reduces the monthly payment burden and only needs to pay relatively low interest during the repayment period. However, borrowers need to note that when the loan matures, the entire principal needs to be repaid in one go.

2. Equal principal and interest is an installment payment method in which the lender pays a fixed amount of principal and interest in each repayment cycle. This approach is typically used for long-term loans, such as home mortgages. During each repayment period, the borrower needs to pay an equal amount, including principal and interest. As time goes by, the interest gradually decreases and the principal gradually increases in each repayment amount. Through equal repayment of principal and interest, borrowers can plan their financial situation more stably during the repayment period.

3. Overdue means that the borrower fails to repay the loan within the time specified in the loan agreement. If the borrower repays late, the loan contract usually stipulates a certain overdue interest, and the borrower needs to pay overdue fees at the same time. Overdue payments can have a negative impact on a borrower's credit history and may result in the lender taking legal action to pursue the debt.

4. Overdue advance payment is a measure taken by the lender to avoid the borrower's late repayment. In the loan agreement, it is usually stipulated that the lender can advance the overdue principal and interest on behalf of the borrower. Borrowers are required to sign relevant additional clauses when borrowing, allowing the lender to directly deduct the amount owed from the borrower's account if the borrower defaults on repayment.

To sum up, interest before principal and equal principal and interest are two common loan methods. Overdue payment means that the borrower fails to repay according to the time stipulated in the contract. Overdue advance payment is when the lender prevents the borrower from overdue repayment. A compensatory measure taken for payment.

Extended information:

In actual loans, borrowers need to choose a suitable loan method based on their own needs and repayment ability. Interest first, principal later, is suitable for short-term loans, which can reduce the repayment burden, but requires a one-time repayment of the principal. Equal principal and interest are suitable for long-term loans, and the repayment amount is relatively stable, so borrowers can better plan their financial situation. Late repayments can lead to damage to your credit history and even legal disputes, so borrowers are responsible for repaying on time to avoid overdue payments.