In the process of reviewing applications for joint credit cards, financial institutions carefully consider the total household income. This includes the combined earnings of all individuals within the household. This is a crucial factor in determining eligibility for a joint credit card, as it reflects the overall financial stability and capability of the household. It is important to note that household income not only includes salaries but also any additional sources of income, such as investments or rental properties. By considering household income, banks are able to make informed decisions and ensure responsible lending practices.