To get an ITIN you need to attach a tax return to the W-7 per the IRS instructions ...
How do I apply for an ITIN?
Use the latest revision of Form W-7, Application for IRS Individual Taxpayer Identification Number to apply. Attach a valid federal income tax return, unless you qualify for an exception, and include your original proof of identity or copies certified by issuing agency and foreign status documents.
Because you are filing your tax return as an attachment to your ITIN application, you should not mail your return to the address listed in the Form 1040, 1040A or 1040EZ instructions. Instead, send your return, Form W-7 and proof of identity and foreign status documents to:
Internal Revenue Service
Austin Service Center
ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342
You may also apply using the services of an IRS-authorized Acceptance Agent or visit some key IRS Taxpayer Assistance Center in lieu of mailing your information to the IRS in Austin. Taxpayer Assistance Centers (TACs) in the United States provide in-person help with ITIN applications on a walk-in or appointment basis. The IRS's ITIN Unit in Austin issues all numbers through the mail.
If
you also need to file a State return you should file a
timely extension and pay any tax due (if applicable) and
wait for the ITIN to be issued to complete the return.
