An accounting system is at the heart of a successful business.  Every business needs an accounting system.  It enables you determine your expenses, sales and profits.  Without it, you cannot truly manage the business.  To make smart business decisions, you need to have a good accounting system in place. People who fail to set up an accounting system often have IRS problems, cash flow problems and distress.  Before you open your doors, set up your accounting system.  There are many accounting software programs.  For example, Quick Books is very popular with small businesses.