Issuing a refund for your contact (parent)

To issue a refund, you'll simply want to add another line item on the paid invoice and assign a negative value (you can call it whatever you like - generally, "refund" or "credit" does the job):

The above invoice can then be shared with the family along with the check you are issuing a refund for, or simply as a receipt. Once you are satisfied that they have everything they need, you may proceed with cleaning up your records by heading back to the paid invoice and clicking "View/Edit" in the Invoice Autobiography (all the way at the bottom). Then select the option to Delete Payment. The reason we want to delete the payment and add the correct payment after the refund has been issued is that when a report is run, the correct amount will appear for what was paid. Once you have done this, the invoice total and balance should be the amount you have kept from their payment(s).

Then, the last step would be to head back into that invoice one last time and indicate the partial payment for the fees you did keep (so the balance can zero out). Click on "Enter a Payment" and then proceed to fill in the various sections. Be sure to change the date to when you received their payment, as well as uncheck the box to send a payment notification to the parent(s). You can leave an additional private note for yourself at this time if you wish. Then, Save Payment. 

If you scroll to the bottom of your invoice now, you can see all your actions documented in case you need to go back in the future.

If, instead, you want to carry credit over from one invoice to another, please refer to this article - Carrying over credit from one invoice to another