The federal half, in the order the regulation sets it out. Part 673 governs the three campus-based programs, which are Federal Work-Study, the Federal Supplemental Educational Opportunity Grant and the Federal Perkins Loan, the last of which has made no new loans since its statutory authority ran out. Section 673.5(a) states the prohibition as a condition on awarding: an institution may award or disburse a Perkins loan or an SEOG, or award work-study employment, "only" if that aid, "combined with the other estimated financial assistance the student receives, does not exceed the student's financial need." Section 673.5(c)(1) then lists what counts as estimated financial assistance, and item (vi) is "Scholarships, including athletic scholarships." That single clause is the whole mechanism by which an outside award can push a student into an overaward.
The $300 tolerance and the three steps. Section 673.5(d) applies only where the newly discovered assistance "would result in the student's total amount of estimated financial assistance exceeding his or her financial need by more than $300," which means small awards generally pass through untouched. Where the threshold is crossed, the institution takes three steps in order. First, it decides "whether the student has increased financial need that was unanticipated" when the package was built, and if the excess then falls within $300 of the recalculated need, nothing further happens. Second, it "shall cancel any undisbursed loan or grant (other than a Federal Pell Grant)." Third, if total assistance still exceeds need by more than $300, the institution treats "the amount by which the estimated financial assistance amount exceeds the student's financial need by more than $300" as an overpayment, so the $300 tolerance survives into the last step rather than being clawed back with the rest. A small mercy at the end of the chain: under 673.5(f)(3) a Perkins or SEOG overpayment under $25 is neither the student's liability nor something the institution must chase, unless it is a remaining balance or the result of the overaward threshold itself.
The one thing federal law protects, and the one thing it does not. The parenthetical in 673.5(d)(2) carves out a Federal Pell Grant from the cancellation step and carves out nothing else. There is also no federal rule anywhere in part 673 requiring a college to reduce its own institutional grant when an outside scholarship arrives. So the sequence a family should ask about is precisely the one the regulation leaves open: whether the college cancels a loan first, which leaves the household better off by the full amount of the scholarship, or its own grant, which leaves the household no better off at all. The federal rules decide that something has to come out. Which something is the college's decision rather than the government's, and that is the part worth asking about.
A vocabulary warning about the regulation itself. Section 673.5 still says "expected family contribution (EFC)" throughout, including at (c)(2)(i), years after the FAFSA Simplification Act replaced the expected family contribution with the Student Aid Index. The statutory rename was never swept through the campus-based regulations. The text is quoted here as written; the number an aid office is actually working with is the Student Aid Index.
The state layer regulates the discretionary half, and the statutes differ in scope, in who is protected, and in where the ceiling sits. Maryland's is the narrowest and the cleanest to read. Md. Code, Education section 15-121(b) provides that "a public senior higher education institution may reduce institutional gift aid offers as a result of private scholarship awards only under the circumstances described in subsections (c) through (e)," which are that total gift aid exceeds financial need, that the awarding organization approves the further reduction, or that a reduction is needed for NCAA compliance. California reaches further. Education Code section 70048, repealed and re-enacted by the 2024 legislation and operative from July 1, 2025, bars an institution from reducing institutional gift aid because of private scholarships for a student eligible for a federal Pell Grant, a Cal Grant or California Dream Act assistance, unless the student's gift aid exceeds the annual cost of attendance, and then only by the excess. Minnesota's runs through one state scholarship program: section 136A.1465, subdivision 4, bars a public institution or Tribal college from reducing institutional gift aid offered to an eligible student "unless the student's gift aid exceeds the student's annual recognized cost of attendance," and encourages institutions "to implement efforts to avoid scholarship displacement."
Note what changes between them. Maryland's ceiling is financial need; California's and Minnesota's is cost of attendance, which is a higher ceiling and therefore a stronger protection. Maryland's reaches public senior institutions; California's, through the definition at Education Code section 70047(g), reaches any public or private postsecondary institution in the state that receives or benefits from state-funded financial assistance "or enrolls students who receive state-funded student financial assistance", which takes in private colleges as well; Minnesota's reaches one program's participants. Reading one state's rule onto another is the mistake this patchwork invites, and no reliable count of adopting states could be established, so the practical instruction is to look up the statute in the state where the college sits.