How can I claim my son for the earned income credit if I am not claiming him as a dependent? He resides with me and I have full custody, but his father gets to claim him as a dependent. I know I was t

[xmasbaby0]

Are you the custodial parent?  Do you have an agreement with the other parent to allow the other parent to claim them--due to divorce or that you live apart and share custody?  Did one of you sign a Form 8332?

If there is a signed 8332 then the custodial parent retains the right to file as Head of Household, get earned income credit and the childcare credit.  The non-custodial parent gets the child tax credit for children under the age of 17.

As far as the IRS is concerned, the custodial parent is the one with whom the child spent the most nights during the tax year--at least 183 nights.

[macuser_22]

If you are the custodial parent where the child physically lived for more than half the year (183 nights) then:

When you enter the dependent, you say that he/she is "Your child" (not you and your spouse if remarried),
he/she lived with you the whole year,
“no” the child did not pay more than half of his/her own support,
"yes", you have a custody agreement,
and "yes", the other parent is claiming this year.  

That will give you the EIC, Child Care Credit and Head of Household filing status if you otherwise qualify.

The child would be listed as "non-dependent EIC & Dependent Care only".

The other (non-custodial) parent can claim the child’s exemption and child tax credit only and needs a signed 8332 form to do so.