Accounting can be divided into several fields including financial accounting, management accounting, external auditing, tax accounting and cost accounting.[5][6] Accounting information systems are designed to support accounting functions and related activities. Financial accounting focuses on the reporting of an organization's financial information, including the preparation of financial statements, to the external users of the information, such as investors, regulators and suppliers;[7] and management accounting focuses on the measurement, analysis and reporting of information for internal use by management.[1][7] The recording of financial transactions, so that summaries of the financials may be presented in financial reports, is known as bookkeeping, of which double-entry bookkeeping is the most common system.[8]
In addition to being the largest bankruptcy reorganization in American history, the Enron scandal undoubtedly is the biggest audit failure.[73] It involved a financial scandal of Enron Corporation and their auditors Arthur Andersen, which was revealed in late 2001. The scandal caused the dissolution of Arthur Andersen, which at the time was one of the five largest accounting firms in the world. After a series of revelations involving irregular accounting procedures conducted throughout the 1990s, Enron filed for Chapter 11 bankruptcy protection in December 2001.[74]
For the salaried class of taxpayers, the responsibility of correct deduction of tax at source is thrown on employers. While in the case of a business or profession, they are responsible for declaring correct income. So, an employee may hide his other income and not declare to his employer in order to avoid taxes, and business owners also claim excess expense claims and deductions to reduce their tax burden. So in these cases, it takes backstage, and tax evasion/avoidance takes center stage.
The history of accounting is thousands of years old and can be traced to ancient civilizations.[12][13][14] The early development of accounting dates back to ancient Mesopotamia, and is closely related to developments in writing, counting and money;[12] there is also evidence of early forms of bookkeeping in ancient Iran,[15][16] and early auditing systems by the ancient Egyptians and Babylonians.[13] By the time of Emperor Augustus, the Roman government had access to detailed financial information.[17]
Tax accounting in the United States concentrates on the preparation, analysis and presentation of tax payments and tax returns. The U.S. tax system requires the use of specialised accounting principles for tax purposes which can differ from the generally accepted accounting principles (GAAP) for financial reporting.[42] U.S. tax law covers four basic forms of business ownership: sole proprietorship, partnership, corporation, and limited liability company. Corporate and personal income are taxed at different rates, both varying according to income levels and including varying marginal rates (taxed on each additional dollar of income) and average rates (set as a percentage of overall income).[42]
There are several reasons it could be worth it to have an experienced professional do your taxes instead of self-filing. For example, it can help reduce the chance of you making a mistake that could land you in trouble with the IRS. And, it could save you time for other important tasks. If you have a side job, rental property or many assets, having someone do your taxes can pay off in the short- and long-run.
While basic accounting functions can be handled by a bookkeeper, advanced accounting is typically handled by qualified accountants who possess designations such as Certified Public Accountant (CPA) or Certified Management Accountant (CMA) in the United States.  In Canada, the three legacy designations—the Chartered Accountant (CA), Certified General Accountant (CGA), and Certified Management Accountant (CMA)—have been unified under the Chartered Professional Accountant (CPA) designation.