Does anyone know if we can change the bank balance so it matches in quickbooks when you have an overdraft?

Hi there, thanks for posting on the Community today

The In QuickBooks balance is determined by the total of the transactions (plus any opening balance) that have been posted to the bank account. The balance can be a positive or negative amount such as for an overdraft.

You can make sure that the In QuickBooks balance matches the actual bank balance and bank statements by reconciling your account in QB. When you have your bank statement in hand, you'll compare each transaction with the ones entered into QuickBooks. 

Thanks again for reaching Intuit support. I'm just a post away if you have further questions or require additional assistance.