First of all, according to the law of our country, husband and wife enjoy the system of common property in marriage, which is the concept of common property. Therefore, the problem of one party's overdue credit card may affect the security of husband and wife's common property, including the bank running records of both husband and wife.

Secondly, when handling financial lending disputes, the court has the right to consult and obtain relevant evidence to support the judgment. For debt disputes such as overdue credit cards, the court usually looks at the financial situation of the people involved, including the bank flow of both husband and wife. This is to fully understand the debtor's financial situation, so as to judge the nature and amount of debt and the debtor's repayment ability.

Finally, if it is found that the bank flow of one spouse is related to the debt during the investigation, the court can use this as a reference to evaluate the status of the husband and wife's joint property and take corresponding measures to protect the rights and interests of creditors.

To sum up, if one party's credit card is overdue, the court can inquire about the bank flow of both husband and wife. This is because the husband and wife enjoy the joint property system, and the court will comprehensively consider the economic situation of both husband and wife when dealing with debt disputes. Be sure to remind both husband and wife to plan their finances reasonably and jointly safeguard property safety.

Supplementary information:

The joint property system of husband and wife means that the property formed by husband and wife in marriage belongs to husband and wife, and both husband and wife enjoy their income together. According to the provisions of the Marriage Law of the People's Republic of China, the joint property of husband and wife includes the property formed by husband and wife working and living together since the marriage relationship exists, as well as the part of personal property that meets family needs. Therefore, personal debt problems such as overdue credit cards may affect the joint property of husband and wife, and the court will comprehensively consider the economic situation of both husband and wife when dealing with related disputes.

In addition to the court investigation, the bank may also require both husband and wife to prove their financial status in financial services such as loans and credit cards, including bank running water. This is because in financial transactions, the system of joint property of husband and wife has an important influence on the repayment ability and debt ability of both husband and wife. Therefore, when applying for credit business, it may be required to provide the credit status and bank flow of one spouse.

In short, due to the existence of the joint property system of husband and wife, the overdue credit card of one party may lead the court to investigate the bank flow of both husband and wife when dealing with debt disputes. This is to fully understand the financial situation of both husband and wife and make a reasonable judgment on the debt. Therefore, both husband and wife should pay attention to reasonable financial management and jointly safeguard property safety.