Legal analysis: As long as it is signed by the borrower or the debtor himself, it has legal effect, and notarization is not required. You can sue directly when it expires, and you don't need to hire a lawyer. In addition, it can also be notarized, and the notarial certificate can be given enforcement effect, but according to the previous notarization, you can go directly to the court enforcement department with the notarial certificate.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 667 A loan contract is a contract in which the borrower borrows money from the lender, repays the loan at maturity and pays interest.

Article 668 A loan contract shall be in written form, unless otherwise agreed between natural persons.

The contents of a loan contract generally include terms such as loan type, currency, purpose, amount, interest rate, term and repayment method.

Article 669 When concluding a loan contract, the borrower shall, at the request of the lender, provide the true information about the business activities and financial status related to the loan.