Hi, I work for amazon and I am considering self billing, how do I add a deduction for van rental on the invoice...I added it as a svc and it adds it as extra pay instead?

Thank you for getting in touch, Jason. I appreciate you providing the details about your work at Amazon and your interest in self-billing. I'm glad to help you with resolving the issue regarding the van rental deduction. Let me provide you with all the details for comprehensive guidance.

Creating a service item for the "Van Rental Deduction" and adding it to the invoice with a negative amount is the correct approach to reduce the total amount of the invoice by deducting the cost of the van rental.

Resulting extra pay instead of a deduction is due to how the item is set up or applied to the invoice. I'll outline the steps for setting it up correctly.

1. Go to Sales, then choose Products & services.
2. Hit on New.
3. Select Non-stock or Service.
4. Enter a Name for the product or service and an SKU, if you track them.
5. From the Category dropdown, select the category that best describes your product or service.
6. In the Description on sales forms field, enter a description. This is what your customers will see on their sales form.
7. Enter a negative amount in the Sales price/rate field.
8. Select the account you want to use to track the sale from the Income account dropdown.
9. If you need to track VAT, select the appropriate VAT from the VAT ▼ dropdown. 
10. Click on Save and Close.

You can also read this article for the complete details: Add product and service items to QuickBooks Online.

Additionally, I have included these guide articles in categorizing line items and adding accounts to your Chart of accounts.

• Group products and services into different categories in QuickBooks Online
• Add an account to your chart of accounts in QuickBooks Online

If you require further assistance or have questions about adding deductions to your invoices in QBO, return to this thread or create a new one. I'm here to help you and make sure all your concerns are dealt with quickly and efficiently.