Hi there, VK66.

The opening balance on your credit card statement is the total amount of all the recorded bank transactions at the beginning of the statement period. If you have an outstanding balance and there's no payment applied, then the beginning balance is not equal to zero.

However, the beginning balance is zero once you reconcile your Credit Card (CC) statement every month including the last month's payment from your CC account.

If QuickBooks Online beginning balance doesn't match your CC statement, you can follow the steps in this article to fix the discrepancy: Fix an opening balance to match a bank statement.

For more details about beginning balance discrepancies, you can check out this article for your guidelines: Beginning balance discrepancies.

Feel free to reply to this post if you have additional questions. I'll be here to help.