What is an ITIN, and how does it work? An Individual Taxpayer Identification Number (ITIN) is a 9-digit number the Internal Revenue Service (IRS) issues to people filing a tax return who are not U.S. citizens and who do not have or are not eligible for a Social Security number.
我們是由報稅專業人士幫助申請的（把IRS需要的具體信息給他們就是了）
