I've started to actually use the business portion of my Quicken product and began using the invoicing to keep track of things even though I don't actually use the physical invoice. For some of my work, I get paid through a 3rd party (TaskRabbit). Those who hire me have the option of giving a tip. How can I account for this when I have my invoice for just the billed amount and the corresponding deposit is for more than the invoice? Doing nothing shows a negative balance in my AR account.