I filed my taxes through an agent for the year 2014 but the agent filed using Form 1040 and I found out from other sources that I had to file Form 1040 NR, as in 2014, I was in the U.S. for only last ~2 months.
Because of that, I don't pass the IRS' Substantial Presence Test, because I hadn't been in the U.S. for at least 183 days last year (as mentioned in its second point). And also as I don't hold a green card and I am in the U.S. on H-1B Visa, therefore, I was a non-resident in the U.S. in 2014.
Considering all these points, should I be filing an amended form i.e. Form 1040X and also should I send Form 1040 NR now, too, as the form I filed was Form 1040?
Can I do that myself or I have to have ping a lawyer? And how much will it cost me?
It's been 3 weeks since I filed the wrong form i.e. Form 1040 and I haven't received a refund or notice from the IRS yet. Should I wait for the IRS to send a notice or is it safe to just go ahead with filing an amendment?