I’m glad to see you in the Community, info-thecleaning.
Based on the scenario, let’s a create service item for the percentage and use the expense account to track it. Then, create a credit note and apply it to the invoice.
I’m here to help and guide you through the process. With just a few clicks you can accomplish this task.
To add the service:
To create a credit note:
To apply the credit note to the invoice:
For more insights into the process, check out the Create and apply credit notes or delayed credits in QuickBooks Online guide. Additionally, these articles will guide you on how to perform the following tasks in your company.
Feel free to click the Reply button if you have other questions about the product. I'm here to lend a helping hand. Have a great day!