An ITIN (Individual Taxpayer Identification Number) is a tax identification number provided by the Internal Revenue Service (IRS). The IRS offers ITINs to assist persons in complying with US tax rules and to provide a mechanism for those who are not qualified for a Social Security Number to conveniently process and account for tax returns and payments (SSN). The IRS issues ITINs to some non-resident aliens who need a number for a tax treaty, a tax return, or other purposes. We provide our clients free support in applying for and submitting ITINs.