By Tammy Hoang, Certified QuickBooks ProAdvisor | Irvine Bookkeeping — Bookkeeping Services Orange County | (949) 482-2790 One of the most important distinctions in QuickBooks Online bookkeeping is the difference between recording an expense you have already paid and recording a bill you owe but have not paid yet. When a vendor sends you an invoice and you need to pay it in 30 days, that is a bill — a liability sitting in your accounts payable QuickBooks balance until payment