The accounting equation is the foundation of accounting. The accounting equation is written such that assets equal liabilities plus owners' equity. This is a very simple form of the balance sheet. The balance sheet is one of the four financial statements. The balance sheet gives a snapshot of a business' financial health and well-being on any given day. Unlike the other three financial statements, the balance sheet shows assets, liabilities and owners' equity as of only one day in time and not for a period of time. Caution should be taken when reviewing the balance sheet and any other financial statement. A savvy investor should carefully read the accompanying notes to the financial statements for additional information regarding specific account details that may not be obvious in the financial statement data (i.e. age of accounts receivable).