To answer your questions:
1) When you file your 1040NR you would only be claiming income effectively connected to the United States. If you did not have any income effectively connected to the Untied States your income would be $0.00
2) When applying for an ITIN for your wife and child you must attach a tax return to the W-7's you are submitting. When you submit the documents you would attach your tax returns behind the signed W-7's.
You can avoid mailing in the original document by going to a Certified Acceptance Agent or scheduling an appointment at a IRS office to certify the documents. You can look up the address of the closest IRS and the address of a local Certified Acceptance Agent on the IRS website IRS.gov.
3) On Form 1040NR, page 3, there is a limited Schedule A (Itemized Deductions) that allow for some tax deductions instead of the Standard Deduction.
4) On your Form 1040NR, if you are from India and were a student or business apprentice, you can include your wife and children on the return as dependents. Your wife is not required to file a separate Form 1040NR for the first part of the year.
5) TurboTax does not support Form 1040NR or Dual-Status returns. You will need to use Sprintax to file a Form 1040NR and the Dual-Status return. If you have questions you can contact Sprintax Help for assistance.
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