Accidentally invoiced customer twice

Hi jwastase,

Welcome to the Community! QuickBooks is a versatile program that enables you to get your work done faster. I'll be happy to help you cancel that duplicate invoice.

Here are the steps:

1. Go to Sales then select Invoices.
2. Find the duplicate invoice you want to cancel.
3. In the Action column, select the small arrow ▼ icon and then select Void or Delete.
4. Select Void/Yes or Delete/No to confirm.

Please note the difference between voiding and deleting transactions:

• When you void a transaction in QuickBooks, you still have a record of the transaction, but it won’t affect your account balances or reports.
• When you delete a transaction in QuickBooks, the transaction is completely erased from your books, and it won’t appear on any reports or in any accounts.

Here is an article that could help you: Void or delete transactions in QuickBooks Online.

I hope this helps! If you have any other questions, feel free to ask.