The tax return comes first, and then the ITIN application.
Yes, the program will need to have a value in the ITIN/SSN field before you can finish the return in TurboTax. Here is how to Prepare return without ITIN?
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. See Instructions for Form W-7
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 ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342
