Do I have to enter my w2 if I worked less than 4 months at the company

 

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Yes, you should report all income including all W-2’s unless you are not required to file a return.

See Do I Need to File a Tax Return?  Use this IRS Interactive Tool To Find Out.

https://www.irs.gov/uac/do-i-need-to-file-a-tax-return

If you are not required to file a return, you may want to claim the W-2 for a refund of your withholding(s).