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In order to claim the child, he/she must live with you for more than half the year. More than half a year means, at minimum, six months and one day. If you share custody, you may want to keep a log of where the child spends the night in your calendar or day planner.
If two or more taxpayers claim a dependent as a qualifying child in the same year, the IRS will use the following tie-breaker tests to determine which taxpayer is eligible to claim the dependent. The tie-breaker tests are listed in order of priority.
The child will be the qualifying child of: