An ITIN, or Individual Taxpayer Identification Number, is a tax processing number only available for certain nonresident and resident aliens An individual who meets eligibility requirements can file an ITIN application This involves submitting IRS form W-7

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For purposes of tax reporting, Individuals in these circumstances submit applications for ITINs. This is a 9-digit tax number issued by the IRS to those required to have a US taxpayer identification number.