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Internal Revenue Service is located at Department of Treasury, Philadelphia, PA 19255. Charles D Rossotti is the Chief Executive Officer at Internal Revenue Service. You can contact Charles at (202) 622-5000. The CEO of Internal Revenue Service is Charles D Rossotti.
â¢ Check on your refund. â¢ Find answers to most of your tax questions. Telephone Assistance for Individuals: Toll-Free, 800-829-1040. Hours of Operation: Monday â Friday, 7 a.m. â 7 p.m. your local time (Alaska & Hawaii follow Pacific Time).elephone Assistance for Individuals who believe they may be a victim of Identity Theft: No Tax Administration Impact-Did not receive a notice from the IRS. Toll-Free 800-908-4490 (Automated and live assistance). Hours of Operation: Monday â Friday, 7 a.m. â 7 p.m. your local time (Alaska & Hawaii follow Pacific Time).