I admit that I didn't bother to read the definition of "discretionary income" you provided because I took you on your word that it supported when you said:
I just went back and read the definition from the link and I was surprised that it doesn't say ANYTHING about debt!
It says:
So, yeah, we are in agreement and I can get behind that definition too

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I believe that our real disagreement is how she spends her discretionary funds. I don't want to put words in your mouth, so please correct me if I'm wrong. I think you believe that she should take the bonus and pay down her debt with it. I think that as long as she's making her agreed debt payments then the bonus is her's to spend as she wishes. Now, I also do believe that making minimum payments for debt (especially credit card debt!) is foolish because it you're trying to dig yourself out of a hole with a teaspoon. Moving the debt into her home was a smart thing because now she has a specific payment schedule that she can follow with a real end date.