How do I cancel a customers invoice? The work never got done

Welcome to the Community, @ghibouryan.

I'd be glad to help you out by sharing possible scenarios I could think of.

Are you trying to void or delete a customers invoice? If so, I'd be glad to walk you through the steps on how to void or delete an invoice. Here's how:

1. Open the invoice transaction.
2. Click More.
3. Choose Void or Delete.
4. Select Yes to confirm.

Here's an article for your reference: Void or Delete an Invoice, Bill, or other Transactions.

But if you're referring to an invoice that becomes uncollectible, you'll need to record it as a bad debt and write it off. Feel free to check out this article for the detailed steps and information on how to record a bad debt: Write off Bad Debt.

Feel free to leave a comment below if you're referring something else or if you have any other questions. Have a good day!