How can I amend my previous year's return (filed with TurboTax) to reflect Non-Residency status, as opposed to Resident as I am on an F-1 visa?

You can use the steps here below to amend from 1040 resident return and file a correct 1040NR, AFTER the IRS has accepted your return and you've received a refund (or pay tax due). You will need to have your correct tax return prepared as a 1040NR. TurboTax does support nonresident returns however  we partner with Sprintax and they can help you with a 1040NR. 

Print your 1040NR from Sprintax; do not e-file it..  You must mail the 1040NR along with the amended return Form 1040X 

Per IRS Form 1040X instructions,  page 7: 

To amend and file the correct return, do the following:    

• Enter your name, current address, and social security number (SSN) or individual taxpayer identification number (ITIN) on the front of Form 1040X.  

• Don’t enter any other information on page 1. Also, don’t complete Parts I or II on page 2 of Form 1040X.  

• Enter in Part III the reason why you are filing Form 1040X.   

• Complete a new or corrected return, Form 1040NR,  

• Across the top of the new or corrected return, write “Amended.”   

• Attach the new or corrected return to the back of Form 1040X.  

**Make sure you check the box to show the tax year that you are amending on Form 1040X.     Make sure you sign the amended return and the 1040NR before mailing/

1040X