FAFSA rules: The parent with whom the student lived with the most in the most recent 12 months is the "parent’ for FAFSA purposes (and if that parent is remarried, the stepparent is also a parent for FAFSA).
If you pay child support to your ex, he would include that as untaxed income on the FAFSA. The household size is your ex, your D, and any others living in your ex’s household. If you are completing a FAFSA for another child, you cannot include this D in your household size or # in college. If you pay child support for her, you can include this on your FAFSA.
“So I wonder if the college amount I must pay is considered ‘part of a legal child support agreement’” - not sure - guess it depends on the wording of the divorce decree. You don’t get any kind of break on your other kids’ FAFSAs for the money you are obligated to pay for this kid’s college unless you can truthfully say it is child support. Is this actually “a legal child support agreement?” If it actually is, and if you can argue this successfully with the school as being such, it would be reported in the 2nd year as child support received by your ex, rather than as other income for your daughter. You would then be able to report it on your other kids’ FAFSAs as child support paid, I suppose (the D still does not count in # in household or college). My gut would be that this is not actually part of the child support agreement, but rather part of the divorce/custody agreement. But I don’t know that the contract says.
She will not include the amount you are obligated to pay for her for college on her initial FAFSA. In her 2nd year, she will include the amount you paid for her first year of college on her FAFSA (money received or paid on your behalf). This has to be reported because you are not the FAFSA parent. (And as I said earlier, if you were to argue that the money paid is “child support,” this would be on your ex’s info, not your D’s.)
If she goes to a school that requires Profile or has its own financial aid forms, you may have to provide your financial info. For federal aid purposes, though, you do not … you are not the parent for federal aid.
There was a question asked about why you have to provide all your info if all you want is an unsubsidized loan, which is not dependent on need & is guaranteed. The simplest answer I can give is that people don’t always know that they won’t qualify for anything else … there are a lot of people who would figure they won’t qualify for anything & would think it’s easiest just to skip the FAFSA questions and get a loan. While those of us who frequent CC are used to people making a bu**load of money whining about not getting any aid … there really are a ton of folks out there who wouldn’t realize they qualify for Pell, SEOG, FWS, sub loans … and the possible institutional aid that might be available, too. It’s a simple form, really. It’s not all that awful for most of us to complete.