An ITIN, or Individual Taxpayer Identification Number, is a tax processing number issued by the Internal Revenue Service (IRS). It is a nine-digit account number (just like a social security number) that you must request only through the IRS. It is available to people who are not eligible for a Social Security Number (SSN) and need to file a US
The taxpayer's correct ITIN should be used as the identifying number at the top of Form 1040. When inputting W-2 information, the SSN should be entered exactly as shown on the Form W-2 issued by the employer. It is now possible to e-file a return with an ITIN/SSN mismatch. UqcoFts.