@sameerdarbha
Have you read the entire discussion above your first post? If you are a US taxpayer (citizen or resident alien) married to a non-resident alien you have two choices:
You can file as married filing separately. You do not list your spouse as a dependent. Leave the spouse's SSN blank. You will be prevented from e-filing. Print your return, write "NRA" for the spouse's SSN, and mail in your return. Married filing separately has higher tax rates and some deductions and credits are reduced or disallowed.
Or, you can elect to treat your spouse as a "US resident" for tax purposes. This means you can file as married filing jointly, which has lower rates and better deductions. It also means you must report and pay US tax on your spouse's worldwide income (subject to a deduction for foreign taxes that they paid).
If you are filing as married filing separately, you do not apply for an ITIN, and the IRS will not issue an ITIN for a non-resident alien unless they have a financial connection to the US. That might mean they live in the US and work (with or without authorization), or they operate certain types of businesses or hold certain types of investments in the US. If you file MFS, and your spouse doesn't have some other kind of tax connection to the US, she does not apply for an ITIN, and you don't do anything after you file.
If you elect to file as married filing jointly, by treating your wife as a US person for tax purposes, you must file by mail and include a W-7 ITIN application. Print the federal return only. Mail the return and the application to the address for processing ITIN requests. When the ITIN is issued, the IRS will process the tax return automatically. When you get the ITIN letter, you can go back to Turbotax, update the spouse's number, and print and file the state return. This is not an amended return, it is the first original state return you will file, because you won't file the state return with NRA, you will wait for the ITIN. But again, this only applies if you file jointly. If you file as MFS, just file your state and federal returns. You don't amend anything when you get the ITIN.
