Could you please tell me how to use cash discount to customers when they make payment without editing the invoice ?

Hi accasujit,

I appreciate you reaching out to the Community. It's important you're able to apply the discounts for your customer and I'll be happy to show you how. 

QuickBooks offers a variety of amazing features and the Discount feature is one of them. At this time, you'll have to apply a discount for a customer using the steps below: 

Step 1: Turn on the discount feature

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

1. Select Settings ⚙ and then Account and Settings.
2. Select the Sales tab on the menu.
3. In the Sales form content section, select the pencil ✏ icon to edit it.
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. QuickBooks also creates a Discount given account to track everything on your chart of accounts.

Step 2: Apply a discount

Discount a percentage or specific amount

Use the discount field on an invoice or sales receipt.

1. Select + New.
2. Select Invoice or Sales receipt.
3. Add products and services. Then fill out the rest of the form.
4. Select Discount percentage or Discount value to enter the discount as a percentage or a specific amount.
5. Enter the amount you want to discount in the discount field.
6. If you want to discount the total before you calculate sales tax, select the arrow icon next to the discount field.
7. When you're finished, select Save and send or Save and close.

For methods which go beyond this I recommend sending feedback about this to our engineers by clicking the Gear icon and looking for Feedback. New product ideas and improvements are largely based on the feedback we get from users like you. 

In case you have other questions, feel free to contact our support team using this link here. Otherwise, feel free to leave a comment below. I'll be one message away.

But this doesn't answer the original question. It was asking how to apply discount WITHOUT changing the invoice. In QBD there is an option in the section Discounts and Credits where you can choose the amount and account (see image). But there is nothing of the sort in QBO. I can't modify the invoice as it was in the previous month and that period is closed. Regardless, accounting wise, the discount should be recorded at the time of payment as well, so modifying the invoice would not be the proper treatment anyway. 

Is there a fix to this in QBO?