Thanks Robert, and I apologize but I listed question 3 twice, my question was:
* In my case, I received a refund this year with my current forms. However, I'd have to receive an additional refund because I reported interest income from savings accounts, which I understand shouldn't be reported as a nonresident for tax purposes. Since I already received a refund this year, would I need to return it before applying for a larger refund? Or would the IRS just review the difference between tax paid and tax owed?
* You also mentioned that I should use sprintax since I used it originally, but I didn't. I used Turbotax for the forms that need to be amended, so I planned to use Sprintax to submit the new forms. I assume this plan works, but please let me know if you disagree
* Finally, you mentioned that the amendment can be complicated because of the change from resident to nonresident, is that still true if I overpaid taxes? Do you recommend hiring an expert to file the amendment for this type of case? Especially since the IRS review could take years
