do I need of claim my W-2 for a second job where the income is only $2100


    Yes you need to claim all your earned income whether you receive a W-2 or not.  However, this advice holds especially true for W-2s.  This is because there are actually four copies of a W-2 form,  one copy stays with your employer, two copies go to you (although many employers give you one) - this is because prior to e-filing when you had to mail your forms in you had to send a copy in with your federal and state return.  The last copy is sent yo the Social Security Administration which the IRS uses to cross check against the income you claim on your return.  So in short the IRS already has a copy and if you leave this off you will leave yourself open to possible delays and an audit.

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