Can I add a credit card processing fee to the customer invoice?

If you are using QB Payment, you have to do it manually. Otherwise, consider using a 3rd party merchant service to do it automatically. 

Thanks for joining the QuickBooks Community, abllchhi-aol-com.

I'll share additional information about adding a credit card processing fee to the customer invoices.

Currently, the option to add it automatically isn't possible. Instead, you can charge your customer the credit card processing fee by manually adding it as a line item to their invoice. I'll show you how.

Create a service item for the processing fee:

1. Go to Sales, then choose Products and Services.
2. Click on New, then select Service.
3. Enter the name of your service item. (Example CC Fee)
4. Select the account you'd use to track our processing fees under the Income account drop-down.
5. Once done, click Save and Close.

After that, you can add it as an additional item every time you create an invoice for them.

I'm also adding this article to learn about personalizing the sales forms you send to your customer for future reference: Customize invoices, estimates, and sales receipts in QuickBooks Online.

If you have other concerns regarding QuickBooks Online or additional questions managing your customer invoice, please let me know. I'll be here to help you.

@abllchhi-aol-com 

Many states outlaw the practice of adding credit card processing fees to customer invoices.  Make sure yours isn't one of them.  And, it looks bad.  It's like a retailer adding a "rent fee" because you decided to shop in-store instead of online.