how do i balance the credit card showing negative balance

In this situation, to identify why your credit card account has a negative amount in QuickBooks Online (QBO) but not in the bank is to check your recent transactions or see if you have any duplicate transactions. I'll outline the steps below, Flick1.

Additionally, overpaid Credit card bill, and recorded a payment that exceeds the actual amount owed on the Credit card could also be a reason having negative balance.  

Here's how to check your recent transactions in QBO:

1. Go to the Gear icon.
2. Select Chart of Accounts.
3. Choose the Credit card account you want to review, then click the Account history.

You can have this article to review the transactions of your Credit card account: Find, review, and edit transactions in the account history in QuickBooks Online.

These article could also check for any duplicate transactions in your Credit card account, review your reconciled accounts, and to view audit log.

• Find duplicate transaction numbers in QuickBooks Online.
• Fix issues for accounts you've reconciled in the past in QuickBooks Online.
• Use the audit log in QuickBooks Online.

Once this concern is resolved, you can now reconcile your account to ensure the accuracy of your transactions.

These steps will help you identify why your credit card shows a negative balance in QuickBooks Online. This enables you to identify any errors and improve the management of your financial statements.