Thank you for reaching out to the Community. I’ll help you with deleting duplicate transactions in QuickBooks Online (QBO).
The amounts will automatically adjust when duplicate transactions are deleted. On the other hand, when adjusting your VAT account, you’ll have to do it manually. Consequently, your VAT control and/or VAT suspense account will be impacted by the return. Thus, consulting your accountant is one of the best options for expert advice.
Thanks for getting back to us in the Community! I’m here to chime in and help you with each of the details you need in QuickBooks Online.
To answer your first question, I do agree that you can just locate the bank deposits and delete the duplicates.
For the second question, a VAT adjustment won’t occur when you’ve deleted the transactions. That said, you’ll have to manually adjust your VAT return. However, if you’re unsure about making an adjustment, I recommend seeking expert advice from an accountant.