Paris climate change agreement: the world's greatest diplomatic success. French foreign minister and president-designate of COP21 Laurent Fabius (centre), raises hands with UN secretary general Ban Ki Moon and French president FranÃ§ois Hollande.
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Call the IRS toll-free number (800) 829-1040. Related Resources. 1  Treasury Offset Program Call Center. ( 2 800) 304-3107, or for International Calls click here. 3  Internal Revenue Service. ( 4 800) 829-1040. 5  IRS Form 8379.