Following the invention of checks, financial transactions have become very secure. Because of this marvelous financial instrument, the transaction process has also become faster. During the implementation process of the circulation of checks, various regulatory and governing bodies all over the world made some strict rules. These rules are to be followed by every financial organization, business entity, and individual. These mandates are passed to make financial transactions more safe and secure. The regulation that can be regarded as the most important one is that every check should have several unique codes printed at the bottom of it. These unique codes represent the specialized serial or check number, the routing number, and the account number. When an account number is assigned to an account different types of accounts will have different styles of account numbers. You can say that personal and business accounts will have a different sequence of the account number. If an individual is familiar with these they can easily differentiate between business checks for QuickBooks and personal checks.