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Tax Professionals – Internal Revenue Service

If you are a taxpayer with specific individual or business account questions you should contact the International Taxpayer Service Call Center by phone or fax.

The International Call Center is operational Monday through Friday, from 6:00 a.m. to 11:00 p.m. (American Eastern Time): Phone: +1-267-941-1000 Fax: +1-267-941-1055 Mail: Internal Revenue Service International Accounts Philadelphia, PA 19255-0725 USA.