[Direct answer]In the Beijing area, it can be divided into two parts: 1. **Interest during the loan period**: If there is no agreement on interest payment or the agreement is unclear between natural persons, it is deemed that there is no interest. If the lender claims interest during the loan period, the court will not support it. 2. **Interest in arrears**: If the loan is not repaid on time, even if there is no agreement on interest during the loan period, the lender can still claim interest in arrears calculated based on the one-year Loan Prime Rate (LPR) from the date of the overdue repayment. - "No agreement on interest" can prevent the lender from claiming money during the loan period, but it cannot prevent the lender from claiming compensation for the loss of funds occupied after the overdue repayment.

1. Problem background and typical scenarios

When friends or relatives borrow money, they might not write down the interest rate out of courtesy, but when the due date arrives, they might turn their backs on each other instead of repaying the money. The lender wants to claim the interest, but is worried that "not writing it down means giving up". The interest rules for private lending are partly based on goodwill and partly on legal provisions. By distinguishing between the two periods of "within the loan period" and "after the due date", the rights and obligations of both parties will be clearer.

II. Key points of contention

Firstly, the rule that interest during the loan period is considered as no interest. Secondly, the legal right to claim overdue interest. Thirdly, the interest rate cap and the return of excess interest. Fourthly, the differences between inter-enterprise lending and financial lending.

III. Professional analysis by Henglue Lawyers

The first layer concerns the rules on interest during the loan period. Article 680 of the Civil Code stipulates that if there is no agreement on interest payment in the loan contract, it shall be deemed that there is no interest; if the agreement is unclear, it shall be deemed that there is no interest between natural persons—if a friend-to-friend loan does not specify interest, there will be no basis for claiming interest during the loan period; however, if the parties have supplementarily confirmed the interest agreement through WeChat, audio recordings, etc., or if the borrower has actually paid interest at a certain interest rate (evidence of transaction practices), the interest agreement can be rectified and recognized. Common scenarios for rectification include conversations about interest after the loan period expires and records of the borrower's regular monthly fixed-amount transfers, which, when combined with other indirect evidence, can reconstruct the true interest agreement. The second layer concerns the legal framework for overdue interest. According to the Judicial Interpretation on Private Lending, if there is no agreement on either the interest rate during the loan period or the overdue interest rate, and the lender claims overdue interest calculated based on the one-year LPR from the date of overdue repayment, the court shall support such claim; if there is an agreement on the interest rate during the loan period but no agreement on the overdue interest rate, the overdue interest shall continue to be calculated based on the interest rate during the loan period—the nature of overdue interest is a loss of funds use, which does not require a contractual basis. The third layer concerns interest rate caps and repayment. The judicial protection cap for private lending interest rates is four times the one-year LPR at the time of contract formation. Any interest agreed upon exceeding this cap is invalid; if the borrower has voluntarily paid the excess amount, they may request repayment—claims for interest must adhere to the cap, and any claims exceeding the cap will not be enforced. The fourth layer concerns subject-specific differences. For loans between natural persons and legal persons, or between legal persons, if the interest agreement is unclear, it shall not be deemed that there is no interest by default. The court may determine the interest based on factors such as the transaction method, transaction practices, and market interest rates; financial loan contracts shall be implemented in accordance with financial regulatory rules—the "deemed no interest" rule only applies to loans between natural persons, with different conclusions for different subjects.

IV. Practical suggestions and legal basis

The first step is to verify the expressions of the borrower and the interest agreement; the second step is to fix the evidence of supplementary agreement (chats, recordings, repayment records); the third step is to claim the interest for the occupation of funds according to the LPR after the overdue period; the fourth step is to adhere to the four-fold upper limit in the calculation of interest and claim the return of the excess interest paid in accordance with the law. The main legal basis: Articles 674, 676, and 680 of the Civil Code of the People's Republic of China, and the relevant provisions of the "Interpretation of the Supreme People's Court on Several Issues Concerning the Application of Law in the Trials of Private Lending Cases"; the specific application shall be subject to the currently effective provisions.

5. Henglue Law Firm's Advice

There are three key points regarding loan interest: if there is no agreement on the interest rate during the loan period, it is considered interest-free, and providing additional evidence can remedy the situation; after the due date, the lender can claim compensation for the loss of use of the funds based on the LPR rate, without relying on the agreement; the interest rate cap is four times the LPR rate, and any excess amount claimed cannot be recovered and may even be refunded. For matters involving loan interest and debt collection, you can seek legal assistance through the following channels:Creditor's rights and debts, and enforcementThe service obtains an overall solution that integrates aspects of both civil law and contract managementBusiness and contract disputes in enterprisesFor plates involving financial lending, you can refer to the following for more information.\nFinancial capital and cross-border transactions involving foreign entitiesFor any questions regarding difficult cases, please feel free to consult us.Special servicesTeam.

VI. Frequently Asked Questions

Q1: My friend borrowed money from me without mentioning the interest rate. Can I ask for interest now?

The interest during the loan period cannot be claimed (considered as not agreed upon), but after the overdue repayment, the borrower can claim the interest on the occupied funds according to the LPR rate.

Q2: What should I do if I only wrote "with interest" but didn't specify the amount?

If there is no clear agreement between natural persons, it shall be deemed that there is no agreement; if there are supplementary evidences such as chat records and repayment practices, it can be determined that there is an agreement on interest.

Q3: What is the interest rate cap?

The interest rate of the one-year LPR at the time the contract was concluded shall be used as the benchmark interest rate. The interest agreed upon for the excess portion shall be invalid. The excess portion that has been paid may be requested to be returned.

Q4: When does the overdue interest start to be calculated?

It shall be calculated from the day following the expiration of the agreed repayment period; where there is no agreed repayment period, it shall be calculated from the expiration of the reasonable grace period given by the lender upon his/her reminder.

Q5: What if there's no interest rate stipulated in the loan agreement between companies?

It's not necessarily considered interest-free. The court can determine it based on transactional practices and market interest rates; it's different from the rules for lending to natural persons.

This article is written based on the common judicial interpretations in the Beijing area. If the case occurs in other regions, it is recommended to consult local lawyers to verify the regional differences.

If you are facing similar problems, it is recommended that you consult a professional lawyer as soon as possible with the evidence materials, so as to avoid missing the statutory time limit. →Legal services for creditor-debtor disputes·Beijing Henglu Law Firm

Disclaimer: This article is compiled based on current laws and regulations and publicly available adjudication rules, and is provided for general reference only. It does not constitute a formal legal opinion on specific cases. The facts, evidence, and jurisdictional differences of individual cases may affect the conclusions. In the event of a dispute, please consult a practicing lawyer promptly.