1. The serious consequences for the borrower are:

(1) generates penalty interest. As long as it is overdue, there will be a penalty interest, that is, a certain percentage of interest will be added on the basis of the original interest;

(2) Being classified as dishonest will affect future loans and real estate. After the deadline, the credit report will inevitably leave a bad record. If the circumstances are serious, it will not only be included in the list of untrustworthy executors, but also affect future real estate loans;

(3) facing litigation problems. Generally speaking, after a certain period of time is overdue, the bank will issue a collection notice. If the collection fails, the bank will sue the borrower and safeguard the legitimate rights and interests through legal means.

2. Legal basis: Article 42 of People's Republic of China (PRC) Commercial Bank Law.

The borrower shall repay the loan principal and interest on schedule.

If the borrower fails to repay the secured loan at maturity, the commercial bank has the right to require the guarantor to repay the principal and interest of the loan or give priority to the repayment of the collateral. Real estate or equity acquired by a commercial bank due to the exercise of mortgage or pledge shall be disposed of within two years from the date of acquisition.

If the borrower fails to repay the credit loan at maturity, it shall bear the responsibility in accordance with the contract.

Second, how to calculate overdue loans?

1, according to the interest rate agreement within the contract period. Within the performance period agreed in the loan contract, as long as it does not violate the provisions of the People's Bank of China on the upper and lower limits of the loan interest rate of financial institutions, and private lending is not higher than 4 times the bank loan interest rate, the interest paid by the borrower can be used to calculate the overdue interest of overdue loans according to the interest rate agreement;

2. Calculate the interest according to the relevant provisions of the People's Bank of China. This interest-bearing method still abides by the original loan interest rate during the performance of the loan contract, and the overdue interest in installments is not calculated when the interest rate is adjusted. For the interest rate of overdue loans, the overdue interest shall be collected by installments according to the interest rate adjusted in different periods determined by the People's Bank of China, and the overdue interest shall be collected by default interest according to a certain proportion, or by installments according to the default interest rate determined by the People's Bank of China.