Certified Public Accountant (CPA) is the statutory title of qualified accountants in the United States who have passed the Uniform Certified Public Accountant Examination and have met additional state education and experience requirements for certification as a CPA. In most U.S. states, only CPAs who are licensed are able to provide to the public attestation (including auditing) opinions on financial statements. The exceptions to this rule are Arizona, Kansas, North Carolina and Ohio, where although the "CPA" designation is restricted, the practice of auditing is not.

Many states have a lower tier of accountant qualification (below that of CPA), usually entitled "Public Accountant" (with designatory letters "PA"). However the majority of states have closed the designation "Public Accountant" to new entrants, with only about 10 states continuing to offer the designation. Many PAs belong to the National Society of (Public) Accountants.

Many states prohibit the use of the designations "Certified Public Accountant" or "Public Accountant" (or the abbreviations "CPA" or "PA") by a person who is not certified as a CPA or PA in that state. As a result, in many circumstances, an out-of-state CPA is restricted from using the CPA designation or designatory letters until a license or certificate from that state is obtained.

Services Provided by CPAs

The primary function CPAs fulfill relates to assurance services, called public accounting. In assurance services, also known as financial audit services, CPAs attest to the reasonableness of disclosures, the freedom from material misstatement, and the adherence to the applicable generally accepted accounting principles (GAAP) in financial statements. CPAs can also be employed by corporations – termed 'the private sector' – in finance functions such as Chief Financial Officer (CFO) or finance manager, or as CEOs subject to their full business knowledge and practice. These CPAs do not provide services directly to the public.

Although some CPAs serve as business consultants, the consulting role is under scrutiny following the corporate climate in the aftermath of the Enron scandal. This has resulted in divestitures in the consulting divisions by many accounting firms. In audit engagements, CPAs are (and have always been) required by professional standards and Federal and State laws to maintain independence (both in fact and in appearance) from the entity for which they are conducting an attestation (audit and review) engagement. However, most individual CPAs who work as consultants do not work as auditors, or vice versa.

CPAs also have a niche within the income tax preparation industry. Most small to mid-sized firms have both a tax and an auditing department. Someone's CPA is one of that individual's most trusted experts. CPAs are scattered throughout the business world.