Internal Revenue Service IRS is a government body that collects tax and executes the Internal Revenue Code in the United States. It was governed by the IRS Commissioner. IRS delivers many services to the citizens by collecting taxes. The international taxpayers can also contact IRS who live outside the United States. It also manages all the complaints regarding the fraud of taxes. The contact details like address, contact number, customer care number and customer service phone number of Irs Washington Dc is displayed above.