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The original was posted on /r/AmItheAsshole by /u/IYKYKSEA on 2023-09-26 06:33:08.

I am a single mother with two children. The kids have four nights per month with their dad. When our parenting plan was developed, we agreed to allow him to claim the oldest child so as long support payments were current. (At the time, he had 10 overnights).

Two years ago, I informed him that because he was 6k behind in support, I planned to exercise our agreement and claim both children. He responded with some selective words and told me that since I make more than him (66% of our collective income) I didn't need the money.

When I filed my taxes, they were rejected stating that my son was already claimed. I ended up submitting my taxes manually, providing copies of our parenting plan, custody agreement, proof of support arrears, and our email exchange stating my intent. While it took nine months, I finally received my return (along with the money from his return that was garnished due to his owing).

Two weeks ago, he informed me that the IRS had communicated that he didn't have the right to claim our child from two years ago, and he now owes 6k. He asked if I was aware and if I had claimed our oldest. I explained the circumstances and that yes, I had challenged his filing. He is now not speaking to me. AITA for informing the IRS and not just letting him claim despite our agreement?