Hi I filed 1040 through turbotax instead 1040NREZ/1040NR mistakenly. Is it unlawful to file 1040?if I will be filing for next year using 1040NR would there be any trouble?

You filed incorrectly, and you need to fix that by filing Form 1040X and attaching a properly-prepared Form 1040NR-EZ with the word "AMENDED" printed on the top of the first page of the Form 1040NR-EZ.

Further, if you are under a F-1 or J-1 visa, you must also file Form 8843.

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