I'll help you in writing off the balances of your invoices in QuickBooks, @Constdan91.

When creating a bad debt, let's make sure that we track this to an expense account. This way we can offset your accounts receivable on the Balance Sheet.
 

Here's how you to add an expense account to track the bad debt

1. Go to the Lists menu and select Chart of Accounts.
2. Click the Account menu, then select New.
3. Click Expense, then Continue.
4. Enter an Account Name, for example, Bad Debt.
5. Click Save and Close.

Once done, let's delete the payment that you've created to write off the invoice. This way, we can start over to close out the unpaid invoice.

1. Open the invoice and click the Payment link in the right-hand corner.
2. Click Delete.
3. Once a prompt pops out, click OK.

After deleting the payment, we can now write it off again. Let me show you how:

1. Go to the Customers menu and select Receive Payments.
2. Enter the name of the customer in the Received from field.
3. For Payment amount, enter $0.00.
4. Click Discounts and credits.
5. In the Amount of Discount field, enter the amount you'd like to write off.
6. For Discount Account, select the bad debt account, and select Done.
7. Click Save and Close.

In addition, you can check your customers' open balances by running the Accounts Receivable Aging Detail report. Just follow these steps: 

1. Go to the Reports menu and select Customers & Receivables.
2. Click A/R Aging Detail. 

You can also customize this report to easily review the information that matters to your business the most. 

If you have further questions or concerns, feel free to reach back out anytime. Stay healthy and keep safe.

For more information on taxes, forms, filings, payroll and other Year End activities, make sure to check out our Year End Resources page.