Good day, chart.

Let me join this thread so I can share more details on how to handle unpaid invoices.

I understand that you need to track the unpaid invoices especially since you paid the sales taxes already. Though you can void them, there's a better way to record it. We can write off bad debt in QuickBooks Desktop.

The first thing we need to do is to set up an expense account. You can follow these steps:

1. From the Lists menu, select Chart of Accounts.
2. Click the Account menu, then New.
3. Select Expense, then Continue.
4. Enter an Account Name, and tap Save and Close.

Once done, these are the steps to close out the unpaid invoices.

1. Go to the Customers menu and select Receive Payments.
2. Enter the name of the customer in the Received from field.
3. Make sure that the Payment amount is $0.00.
4. Click the Discounts and credits and enter the amount you'd like to write off in the Amount of Discount field.
5. Select the expense account you added as the Discount Account, then click Done.
6. Tap Save and Close.

In regards to sales tax, it'll result in overpayment since it reduces the previous payable. You can check this link for more details: Process sales tax adjustment Also, I'd recommend consulting with your accountant for you to be guided properly about tax overpayment.

Comment again if you need anything else. Wishing you all the best!