Hello there, @Pip and You,

 

I can definitely help you out! For this, we can fix your negative balance by editing your opening balance in the Chart of Accounts. 
 

You can follow these simple steps:
 

1. Go to Settings and select Chart of Accounts.
2. Locate the account and select View register.
3. Find the opening balance entry. Tip: Sort the date column to show the oldest entries first.
4. Select the opening balance entry.
5. Edit the date, then the amount. If needed, select Edit to make your changes.
6. Select Save.
    

For more information, you can visit: Enter and manage opening balances in QuickBooks Online.


If editing your opening balance still doesn't reflect, you can refer to this article: What to do if you didn't enter an opening balance in QuickBooks Online.


I will also add articles here that you can refer to for future use if you happen to want to reconcile, categorize, and match your banking transactions: 
 

• Learn the reconcile workflow in QuickBooks.
• Fix issues for accounts you've reconciled in the past in QuickBooks Online.
• Categorize and match online bank transactions in QuickBooks Online.
  
   

Please don't hesitate to reach us back or simply add a reply under this post if you need more assistance with your banking transactions. Have a great day!