I forgot to mention that when we send out the charitable tax receipts as an "invoice" in QB, the email to the donors will show an Amount Due in the amount of the donation, that can be confusing to the donors. That's because we have not performed the "Receive payment" transaction. What I do is put a note in the message to tell the donors to ignore the Amount Due and just refer to the attachment for the tax receipt. This is the best work around I can think of, until QB come up with an import for custom sales receipts...