The Office assists the Secretary in developing and implementing tax policies and programs; provides the official estimates of all Government receipts for the President's budget, fiscal policy decisions, and Treasury cash management decisions; establishes policy criteria reflected in regulations and rulings and guides preparation of them with the Internal Revenue Service to implement and administer the Internal Revenue Code; negotiates tax treaties for the United States and represents the United States in meetings and work of multilateral organizations dealing with tax policy matters; and provides economic and legal policy analysis for domestic and international tax policy decisions.
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