IRS creates web site for EITC partners and tax preparers. Check it out> http://www.eitc.irs.gov/central/main/
2010 Eligibility ranges from $13,460 (single no children between the age of 25 and under 65 at the end of the year ) to $48,362 (married filing jointly w/3+ qualifying children). For a list of Oklahoma, IRS trained volunteer income tax preparation sites, click here>
http://www.tax.ok.gov/vitatce.html