Doug O’Donnell, a 40-year veteran of the I.R.S., was elevated last month after the last commissioner stepped down at the beginning of President Trump’s term.

The acting head of the Internal Revenue Service plans to retire Friday, the agency announced Tuesday, after weathering weeks of chaos and cutbacks at the agency since President Donald Trump took office.

Doug O’Donnell, the acting head of the IRS, is expected to announce his retirement on Tuesday amid turbulence at the tax collection agency, according to a person familiar with his plans. His planned departure comes nearly a week after the Trump administration started laying off thousands of agency workers and following a bid by personnel from the so-called Department of Government Efficiency to gain access to taxpayer data.

Douglas O’Donnell, a 38-year agency veteran, is poised to depart during tax-filing season.