The first thing to do is to make sure you qualify for it. If you find that you do, go over your entries carefully. Some of the questions might be confusing. Lastly, you might have had your EIC disallowed in the past and need to file a Form 8862 8862
To qualify for and claim the Earned Income Credit you must:
In addition, both your earned income and Adjusted Gross Income (AGI) may not exceed:
One more thing – if you're not claiming a qualifying child:
You (or your jointly filing spouse) must have been born on or after January 1, 1955; and
You (or your jointly filing spouse) must have been born on or before December 31, 1994; and
You (and your jointly filing spouse) cannot be claimed as a qualifying child or dependent on anyone else's return