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:

• Have earned income; and

• Have been a U.S. citizen or resident alien for the entire tax year; and
• Have a valid Social Security number (not an ITIN) for yourself, your spouse (if filing jointly), and any qualifying children on your return; and
• Not have investment income exceeding $3,600; and
• Not be filing a Form 2555 or 2555-EZ; and
• File a return with the Single, Married Filing Jointly, Head of Household, or Qualifying Widower filing status, even if you're not required to file a return.

In addition, both your earned income and Adjusted Gross Income (AGI) may not exceed:

• $15,570 if you're not claiming a qualifying child ($21,370 if filing jointly);

• $41,094 if you're claiming 1 qualifying child ($46,884 if filing jointly);
• $46,703 if you're claiming 2 qualifying children ($52,493 if filing jointly);
• $50,162 if you're claiming 3+ qualifying children ($55,952 if filing jointly).

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

are you working?  if not, you are not eligible for EIC.