President Donald Trump will officially nominate Charles Rettig as IRS commissioner later today, according to a White House official. Rettig is currently a tax lawyer with the firm Hochman, Salkin, Rettig, Toscher, and Perez, P.C. and has been with the firm for 35 years. Rettig would replace Treasury Assistant Secretary for Tax Policy David Kautter who has served as acting IRS commissioner since November 2017, when former Commissioner John Koskinen left the agency at the end of his term.