QB will not let me discount a supplier invoice by 1 pence due to it being a CIS invoice. How can I remove the 1 pence?

Hi there, @clair-webb.

You can add the discount as a line item on the bill using an income account. Enter the amount as a negative number. See the screenshot below.

Another option is to enter a supplier credit. Follow the instructions below:

1. Select the + New button in the upper left corner.
2. Choose Supplier Credit.
3. Select the supplier that has issued the discount from the Supplier dropdown.
4. Under the Category Details, select the income account for the discount.
5. Enter the amount of 1 pence.
6. Select Save and close. 

Once you pay the bill, the discount will show under the Credit Applied column.

For additional details in entering a credit from a supplier, feel free to read this article: Enter a credit from a supplier.

Get back to me if you have other concerns about applying supplier discounts. I'll be around to answer them all for you. Keep safe and have a good one!