I had filed 2010 US tax returns to the best of my knowledge using one of the famous online websites. Fast forward now (2014), I realized that I was in US for half a year and should have filed as nonresident alien instead of resident alien. The online tool provided no information about it back then; instead it provided me with credits that are available only for the resident aliens.
I amended my tax and sent a check a couple of weeks ago. I received a letter from IRS saying the credit has been disallowed as it's more than 3 years after I filed tax. It doesn't ask me to pay more, but mentions that I can appeal if needed or bring a suit.
It also doesn't say if they are refund the check I had sent with the amendment. I will call them soon.
Isn't there a way to correct the mistake? Is there a fear of audit of 2010 returns even though the statute of limitation has expired?
The reason for amendment was that resident aliens should show worldwide income and that would increase my income whereas nonresident aliens don't have to show worldwide income which wouldn't increase the income, however, it doesn't allow to claim certain credits.