According to the laws of our country, if the lender requires the borrower to pay interest at the interest rate agreed in the contract, it shall be protected by law. However, if the interest rate agreed upon by both parties at the time of the establishment of the contract exceeds four times the quoted interest rate of the one-year loan market, then the law will not protect it, because it is usury at this time. Therefore, if the installment interest of high rent does not exceed four times the quoted interest rate of one-year loan market when the contract is established, it is legal.

Legal basis: Provisions on Several Issues Concerning the Application of Laws in the Trial of Private Lending Cases Article 26 If the lender requests the borrower to pay interest at the interest rate agreed in the contract, the people's court shall support it, except that the interest rate agreed by both parties exceeds four times the quoted interest rate in the one-year loan market at the time of the establishment of the contract.