If you qualify for an ITIN and your application is complete, you will receive a letter from the IRS assigning your tax identification number usually within seven weeks. If you have not received your ITIN or other correspondence seven weeks after applying, call the IRS toll-free number at 1-800-829-1040 to request the status of your application if you are in the United States. If you are outside the United States, call 267-941-1000 (not a toll-free number).