Criminal Investigation is a division of the Internal Revenue Service, which in turn is a bureau within the United States Department of the Treasury.

The Chief is appointed by the Commissioner of Internal Revenue and oversees a worldwide staff of approximately 3,300 CI employees, including approximately 2,200 special agents who investigate and assist in the prosecution of criminal tax, money laundering, public corruption, cyber, ID theft, narcotics, terrorist-financing and Bank Secrecy Act related crime cases.

[4] (1) The Chief is responsible for the full range of planning, managing, directing, and executing the worldwide activities of CI.

Communications and Education also coordinates field office publicity through the PIOs who are special agents trained in media relations.

Equity, Diversity & Inclusion's responsibilities include educating management and employees on equity, diversity & inclusion, how to resolve complaints and conflict in the workplace, and providing observation on recruitment, outreach, promotion, retention, and leadership initiatives, thereby improving workforce demographics to achieve equal opportunity.