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

I know how it is important to record correctly all of your transactions in QuickBooks. When invoices you send in QuickBooks Desktop become uncollectible, you need to record them as a bad debt and write them off.  

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

1. Go to the Lists menu. 
2. Select Chart of Accounts.
3. Click the Account menu at the bottom left, then select New.
4. Select Expense, then Continue.
5. Enter an Account Name. 
6. Click Save and Close.

Once done, we can start over to close out the unpaid invoice. 

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

In addition, you can check the customer's open balances by going to the Reports menu and selecting Customers & Receivables. Then, click A/R Aging Detail.

I'm also adding these resources that can guide you manage your reports in QuickBooks:

• Customize reports
• Create, access, and modify the memorized report

I’m happy to offer assistance again if you have any other concerns or questions about invoices in QuickBooks Desktop. Post a new thread or reply here and I’ll be there.