1. How to write the loan interest correctly? 1. Interest is dispensable. The parties may or may not agree on the interest of the loan contract. According to the Contract Law, the loan contract is the product of the autonomy of the parties, and the law will not interfere too much. When the loan contract stipulates interest, it is also completely determined by the parties through consultation. 2. Interest shall not exceed the maximum interest rate stipulated by law, and shall not exceed four times the interest rate of bank loans in the same period. Article 6 of "Several Opinions of the Supreme People's Court on People's Courts Handling Lending Cases" stipulates that the interest rate of private lending can be appropriately higher than that of banks, and local people's courts can specifically grasp it according to the actual situation in the region, but the maximum interest rate shall not exceed four times (including interest rate) of similar loans of banks. Beyond this limit, the excess interest will not be protected. Specific method for determining the interest of loan contract 1. If the parties have agreed on interest and interest rate, it shall be handled in accordance with the agreement in the contract. 2. If the interest rate is agreed between the parties to a private lending contract, the agreed interest rate may be appropriately higher than the bank loan interest rate, but it shall not be higher than the relevant provisions of the state on limiting the loan interest rate. According to the judicial interpretation, the interest rate of private lending shall not exceed 4 times the interest rate of similar loans of banks (including interest rates). If this limit is exceeded, the excess interest will not be protected. 3, private lending parties shall not agree to calculate compound interest. The Supreme People's Court's judicial interpretation points out that the lender shall not include interest in the principal to obtain high profits. If it is found during the trial that the creditor included the interest in the principal to calculate compound interest, if its interest rate is more than four times that of similar bank loans, the excess interest will not be protected. 4. If there is no agreement or unclear agreement on the payment of interest in the private lending contract, it shall be deemed as non-payment. To sum up, in the current Internet age, loans can be obtained through various channels. If banks can't borrow, they can borrow privately. If the loan interest is four times higher than that of the bank, it belongs to usury, which is illegal and can be borrowed within a reasonable range. You can also borrow money through internet products, and you also need to pay interest, which is generally higher than that of banks.