College costs after divorce: 529s, FAFSA, and who pays

Here's an oddity of family law: married parents have no legal duty to pay for college, but divorced parents can be ordered to — in many states, courts enforce college-cost provisions in divorce decrees, and in a few they'll impose the obligation themselves. Add in the question of who controls the 529 plan and a financial aid system with special rules for divorced families, and college becomes one of the most consequential, least-negotiated sections of the settlement. Parents of a toddler still need to get this right; the decree they sign now governs a bill arriving in fifteen years.

Writing the college provision like it matters

• Cap the obligation objectively: 'each parent pays one-third of the cost of attendance at the state flagship, child covers the rest through aid and work' is enforceable and budgetable. 'Parents will contribute to college' is a future lawsuit.
• Define what counts: tuition, fees, room and board? Books, travel, a laptop, Greek life? Four years or five? Grad school (almost always: no)?
• Set conditions: full-time enrollment, a minimum GPA, and a requirement that the student apply for aid — standard, reasonable, and they prevent funding a decade of meandering.
• Tie shares to means at the time, or build in a modification trigger — the parent who earns $150,000 at the decree may earn far less at enrollment, and vice versa.
• Address the existing savings explicitly: who owns each 529, what it must be spent on, and whether either parent can withdraw for anything other than the child's education (the correct answer is no, in writing).

The 529 question: ownership is control

A 529 account has one owner, and the owner holds all the power: they can change the beneficiary to another child, withdraw the money (paying tax and a 10% penalty on earnings), or simply refuse to spend it as intended. The divorce decree should name the accounts, freeze non-educational withdrawals, require statements shared with the other parent annually, and specify what happens to leftovers. Where trust is thin, real options include splitting the 529 into two accounts (one owned by each parent, funding obligations set proportionally) or moving ownership to a neutral arrangement. What doesn't work is ignoring it: a 529 owned by an ex who remarries and has new children is one beneficiary change away from funding a different family's tuition.

FAFSA's divorced-parent rules — the new version

For years, the FAFSA counted the parent the student lived with most — which let families legally position the lower-earning parent as the 'FAFSA parent' and leave the higher earner's income invisible to the aid formula. The FAFSA Simplification rules changed the test: the parent who provided the most financial support to the student now files, regardless of where the student sleeps. That closes most of the old strategy, but planning still matters: the filing parent's income and assets drive the Student Aid Index, the other parent's finances still don't appear on the FAFSA itself, and — critically — several hundred mostly private colleges use the CSS Profile, which typically demands both parents' finances anyway and can't be planned around with custody arrangements at all.

A timeline for divorced parents

1. At the divorce (whatever the kids' ages): negotiate the college provision with caps and conditions, and lock down 529 ownership and withdrawal rules in the decree.
2. Freshman–sophomore year of high school: revisit the numbers — incomes change, and a decade-old cost-sharing formula may need mediation now rather than a fight at enrollment.
3. Junior year: determine which parent will be the FAFSA parent under the support test; if support is close to balanced, understand that intentional structure is legal planning, not fraud — and get advice.
4. October of senior year: the FAFSA parent files the FAFSA; complete the CSS Profile where required (noncustodial waivers exist for genuinely absent parents, with documentation).
5. At enrollment: put each parent's payment mechanics in writing — who pays the school what, by when — because the bursar's office does not accept 'my ex was supposed to cover that' as tender.

The three documents, side by side

The bottom line

College and divorce intersect at three documents: a decree that caps and defines who pays what, a 529 whose ownership rules prevent the money from wandering, and a FAFSA whose parent-selection rule now follows financial support. Handle all three when you divorce — even with young kids — and update the plan in high school. The families who improvise this at 17 pay for the improvisation at retail.