Three months. The income proof required by banks for credit card applicants usually requires social security payment certificates or salary card statements for the past three months, and may also require proof of residence stability. Some of the income certificates recognized by banks are such as social insurance policies, bank account statements, and company * **Business fee payment vouchers, etc. are required to be issued for 3 consecutive months (recently), so it will be more difficult to apply for a card if you have just started working. Please consult your local bank for specific information.