1, the available credit card amount is negative, indicating that the repayment amount is greater than the amount owed, and the excess will be displayed as negative.

2. There is also an upper limit on the credit card limit. Once you spend by credit card, the credit card limit is used up or even exceeded, then the over-limit part will naturally be displayed as a negative number.

3. Calculation method of credit card available line: available line = credit line approved by the bank-unpaid bill debt-unrecorded but occurred transaction amount-other related interests and expenses.