How do I take a credit off a customer account? Everytime I try to invoice this certain client, a $300 credit is applied, even though he hasn't paid.

Hello userkeepingclean-sf,

QuickBooks makes it fun and intuitive to track your transactions. I'll be happy to assist with removing the credit from the customer account so you can continue sending out invoices with peace of mind. 

Here's how to delete a credit associated with a customer:

1. Navigate to the Sales tab. Click on the Customers section.
2. Scroll down and find the customer with the Credit you'll be deleting, > click their name.
3. Find the transaction in the list below and click to open it. You can narrow the list based on date or transaction type by using the filter (funnel icon).
4. On the Credit Memo screen, click More at the bottom and select Delete.

From here, the credit won't be appearing on your invoices. If you have further questions regarding this matter, don't hesitate to reach back to me. I'm here to help you achieve your QuickBooks goals so you can get ahead with your work.