Melanie Krause, the IRS's Chief Operating Officer, has been named acting IRS Commissioner following the retirement of Doug O'Donnell. Treasury Secretary Scott Bessent acknowledged O'Donnell's 38 years of service, commending his leadership and dedication to taxpayers. O'Donnell, who had been acting Commissioner since January, will retire on Friday, expressing confidence in Krause's ability to guide the agency through tax season. Krause, who joined the IRS in 2021 as Chief Data & Analytics Officer, has since played a key role in modernizing operations and overseeing core agency functions. With experience in federal oversight and operational strategy, Krause previously worked at the Government Accountability Office and the Department of Veterans Affairs Office of Inspector General. She became Chief Operating Officer in 2024, managing finance, security, and procurement. Holding advanced degrees from the University of Wisconsin-Madison, Krause will lead the IRS until a permanent Commissioner is appointed.