By Tammy Hoang, Certified QuickBooks ProAdvisor | Irvine Bookkeeping — Bookkeeping Services Orange County | (949) 482-2790 QuickBooks Online is the most widely used accounting software for small businesses in the United States — and for good reason. When set up correctly and used consistently, it handles everything from bank feeds and expense categorization to invoicing, bill management, sales tax, and financial reporting in one cloud-based platform. This guide is the fourth