1. I really don't. The resident/non-resident stuff is difficult and uses two different forms. Just file the one you should have filed originally.
2. The correct return should never impact anything negatively.
3. If you used Sprintax originally then the change should be able to be handled by that program. The IRS takes their time with amended returns. It can take years. Here is a tool to track your return after you have submitted it.
4. Yes.
5. The forms that you already submitted can't be changed. The only changes come from new forms that you are submitting.
@user123450
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