How do I apply a discount to a customer invoice for an early payment

Hello @teresa28,

There are two ways to apply a discount to an invoice. Let me discuss them with you and help you get this done. Here's how:

Step 1: Turn on the discount feature

If you haven’t already, turn on the discount feature.

1. Go to the Gear icon, then select the Account and Settings tab.
2. Click the Sales tab.
3. In the Sales form content section, select the pencil icon to edit.
4. Select the Discount checkbox to turn it on.
5. Then select Save and then Done.

This adds the discount field to your invoices and sales receipts. 

Step 2: Add the discount to an invoice or sales receipt

1. Select + New.
2. Select Invoice.
3. Add the products and services. Then fill out the form.
4. Add the Discount item you've created. You can modify the discount if you need to, just get assured it's a negative amount.
5. Select Save and send or Save and new.

You can also check this article link for more details: Add a discount to an invoice or sales receipt in QuickBooks Online.

If you need help receiving payment, you can check this link: Record invoice payments in QuickBooks Online.

Whenever you have follow-up questions, just leave a comment below. I'm always here to help.