I do NOT believe what you are saying is true. A custodial parent can release a child's exemption to a non-custodial parent under the special provisions of §152(e). The Tax Court has ruled that the parents are not required to have ever been married (King 121 TC No. 12). HOWEVER, the only provision in §152(e) that provides this for never-married biological parents, requires that the parents have lived apart at ALL TIMES during the last six months of the calendar year. The original post stating they lived together for 8 months CLEARLY prohibits using §152(e). Thus mom cannot release the child's exemption to dad or anyone else. The rule simply does not apply.
Since the child satisfies all 4 of the requirements with respect to both mom & dad, the child is a qualifying child of both parents. Thus IMO, if the parents are in agreement, the child can be claimed by either parent. If they don't agree and both tried to claim the child, then §152(c)(4)(B) would give the exemption to the mom as the parent with whom the child resided for the longest period of time during the calendar year. That is the first tie-breaker rule for parents and would apply.
Since the child satisfies all 4 of the requirements with respect to both mom & dad, the child is a qualifying child of both parents. Thus IMO, if the parents are in agreement, the child can be claimed by either parent. If they don't agree and both tried to claim the child, then §152(c)(4)(B) would give the exemption to the mom as the parent with whom the child resided for the longest period of time during the calendar year. That is the first tie-breaker rule for parents and would apply.
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