irs customer service number
IRS international customer service phone numbers and address: 1  International Taxpayer Service Call Center Phone Number: 267-941-1000. 2  Austin Customer Service Number: 512-416-7750 (not toll-free). 3  Puerto Rico IRS toll free Number: 1-800-829-1040. 4  Virgin Islands Customer Care Number: 1-800-829-1040.