Switching off Dependents with partner each year

[moviewatcher25]

My partner and I live in the same house and have two kids. I have been filing as single, because I do not think we are in a registered domestic partnership. For the past few years, I have been the sole claimer of the kids as dependents. Now she wants to get started on her taxes and claim the kids this year. We were thinking of trading off every year. Would that be possible, or is there a whole process that gets involved in it? Need I remind that I have been claiming the kids for the most part, and they are still young enough to be claimed.

[AnnetteB6]

As long as both of you are eligible to claim the children as dependents, then you can decide which one of you will claim the children.  It only becomes an issue if you both try to claim them at the same time.  Then the IRS would apply tie-breaker rules to determine which one of you is eligible to claim them.