1040x instruction http://www.irs.gov/instructions/i1040x/ch01.html#d0e618 Tracking Your Amended Return You can track the status of your amended return using our web or toll-free application. Go to IRS.gov and click on “Tools” and then on “Where's My Amended Return.” Or you can call 1-866-464-2050. Either way, you will need to provide the following information. •Your Taxpayer Identification Number (for most taxpayers that is their social security number). •Your date of birth. •Your ZIP code.