In the United States, legally practicing accountants are Certified Public Accountants (CPAs), and other non-statutory accountants are Certified Internal Auditors (CIAs), Certified Management Accountants (CMAs) and Accredited Business Accountants (ABAs). The difference between these certifications is primarily the legal status and the types of services provided, although individuals may earn more than one certification. Additionally, much accounting work is performed by uncertified individuals, who may be working under the supervision of a certified accountant.

A CPA is licensed by the state of his/her residence to provide auditing services to the public, although most CPA firms also offer accounting, tax, litigation support, and other financial advisory services. The requirements for receiving the CPA license varies from state to state, although the passage of the Uniform Certified Public Accountant examination is required by all states. [1] This examination is designed and graded by the American Institute of Certified Public Accountants.

A CIA is granted a certificate from the Institute of Internal Auditors (IIA), provided that the candidate passed a rigorous examination of four parts. A CIA mostly provides his/her services directly to his/her employer rather than the public.

A CMA is granted a certificate from the Institute of Management Accountants (IMA), provided that the candidate passed a rigorous examination of four parts and meet the practical experience requirement from the IMA. A CMA mostly provides his/her services directly to his/her employers rather than the public. A CMA can also provide his services to the public, but to an extent much lesser than that of a CPA.

An ABA is granted accreditation from the Accreditation Council for Accountancy and Taxation (ACAT), provided that the candidate passed the eight-hour Comprehensive Examination for Accreditation in Accounting which tests proficiency in financial accounting, reporting, statement preparation, taxation, business consulting services, business law, and ethics. An ABA specializes in the needs of small-to-mid-size businesses and in financial services to individuals and families. In states where use of the word "accountant” is not permitted by non state licensed individuals, the practitioner may use Accredited Business adviser.

The United States Department of Labor's Bureau of Labor Statistics estimates that there are about one million persons [2] employed as accountants and auditors in the U.S.

U.S. tax law grants accountants a limited form of accountant-client privilege.

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