You may qualify for the earned income tax credit (EITC) if you worked last year but
earned a low or moderate income. EITC is a refundable tax credit, If you qualify, you can use the credit to reduce the taxes you owe and perhaps increase your refund.

To qualify for the credit, your adjusted gross income (AGI) must be below a certain amount, and you must:

• Have a social security number (SSN) valid for employment.
• Have a filing status other than married filing separately.
• Be a U.S. citizen or resident alien all year, or a nonresident alien married to a U.S.
  citizen or resident alien and filing a joint return.
• Not file Form 2555 (related to foreign earned income).
• Not have investment income over $10,300.
• Have earned income from employment or from self-employment.
• Not be a qualifying child of another person (if you’re filing a joint return, your
  spouse also can’t be a qualifying child of another person).
• Have a qualifying child who meets the age, relationship, residency, and joint
  return tests, and isn’t treated as the qualifying child of another person. Or, if you
  don’t have a qualifying child, you must:
• be age 25 but under 65 at the end of the year,
• not qualify as a dependent of another person; and
• live in the United States for more than half of the year.

If you qualify for the credit, the amount of your EITC will depend on your filing status,
whether you have a qualifying child, and if so, how many, and the amount of your wages
and income last year.

Topic No. 601 Earned Income Credit Internal Revenue Service. Available at:
https://www.irs.gov/es/taxtopics/tc60