Resident or Non-resident Alien

Hello Everyone,

 

I departed the US on December 2020.

And I filed taxes with Turbotax for 2020FY as a Resident alien on February 2021. I have already received my refund.

 

However,  now I am doubting If I should have done it as Dual-status and file a 1040NR and a 1040.

I have been reading a lot of info and some say I am ok with the 1040 and claim all 2020 year as resident, as I was more than 300 days in US soil.

But other said, you need to amend it with a 1040X and 1040NR.

 

Anybody that can bring some help to this issue?

 

Thank you very much in advance