EITC is a federal tax credit for low-to-middle income working individuals and families. To qualify you must file an income tax return - even if the IRS doesn't require filing taxes for your income level.
If you qualify for EITC, you also qualify to have your taxes prepared for free.
The EITC has no effect on certain welfare benefits. In most cases, EITC payments will not be used to determine eligibility for Medicaid, Supplemental Security Income (SSI), SNAP, low-income housing or Temporary Assistance for Needy Families (TANF) payments.