How Federal Student Loans Actually Work.

Almost no family saves the entire cost of college, so most fill the rest with borrowing — and for undergraduates, that borrowing is overwhelmingly federal. Federal student loans are the government's program for lending to students and their parents, and they're the default first stop because they're widely available, carry fixed rates, and come with protections that private loans usually don't. The good news is that there aren't many to keep track of. For an undergraduate, there are essentially three, and they come in a recommended order.

The Cast

Three loans, borrowed in order.

Two of the three are Direct Loans made to the student, and the third is made to the parent. You generally take them in this sequence, exhausting the cheapest before moving to the next.

First is the Direct Subsidized Loan, for students with financial need. It's the best money in the program because the government pays its interest while you're in school. Next is the Direct Unsubsidized Loan, open to any student regardless of need; it carries the same rate but starts charging interest immediately. Last is the Parent PLUS Loan, borrowed by a parent to cover whatever the student's own loans can't — at a higher rate and a much higher fee.

First, the Form

None of it happens without the FAFSA.

Before any of these loans is on the table, there's a form. The Free Application for Federal Student Aid — the FAFSA — is the single gateway to every federal loan: file it and you're in the running for all three; skip it and you qualify for none. It isn't one-and-done, either — you file again each year you want aid. (For 2026–27 the federal deadline is June 30, 2027, but sooner is better, because some aid is handed out first come, first served.)

The FAFSA does more than open the door; it does the math that decides which door. From your family's finances it computes a Student Aid Index — a single number for what you're expected to contribute — and your financial need is the school's cost of attendance minus that number minus any other aid. Subsidized loans, the need-based ones, are rationed by that figure; unsubsidized loans aren't need-based, so any eligible student who files can take them up to the limits. To qualify at all, you generally must be a U.S. citizen or eligible noncitizen, enrolled at least half-time in an eligible program, and not in default on an earlier federal loan. Parent PLUS adds one more step: the parent files too and passes a credit check — not an income or credit-score test, but a look for recent adverse credit such as defaults or bankruptcies.

Back to the loans themselves. Two details in that table do most of the work in deciding what a loan costs: the interest rate, obviously, but also that quiet middle column — what happens to interest while the student is still in school. It's the difference between the loans that most people never notice, and it's worth slowing down for.

The Hidden Gift

Why subsidized is the one to grab first.

On a subsidized loan, the government pays the interest the entire time you're enrolled at least half-time, plus a six-month grace period after you leave. So the balance you start repaying is exactly what you borrowed — the in-school years were free of interest. That's a genuine gift, and it's why subsidized loans are capped and reserved for students with need.

An unsubsidized loan has the same rate but no such gift. Interest starts accruing the day the money is disbursed, and while you're in school that unpaid interest quietly builds up. When repayment begins, it gets capitalized — added to your principal — so you then pay interest on the interest. Borrow $10,000 as a freshman and, by the time repayment starts, roughly $2,900 of interest has already been folded into the balance. Same rate as the subsidized loan; a very different total.

Two Ceilings

There's a limit each year, and a limit for good.

Federal student loans don't let you borrow whatever you want. There are two kinds of ceiling, and both matter. An annual limit caps how much you can borrow in a single academic year. An aggregate limit — a lifetime cap — limits the total you can owe across all your years combined. When a plan would cross either one, the extra simply can't be borrowed federally, and becomes a gap to cover another way.

For a dependent undergraduate, the Direct Loan annual limits rise by year: $5,500 as a freshman, $6,500 as a sophomore, and $7,500 as a junior or senior — with only $3,500, $4,500, and $5,500 of those able to be subsidized. Across all four years, the Direct Loan lifetime cap is $31,000, of which at most $23,000 can be subsidized. (Independent students, and dependent students whose parents can't get Parent PLUS, can borrow more.) These undergraduate limits are unchanged for 2026–27.

The 2026 Change

Parent PLUS is now capped.

The biggest recent change is to Parent PLUS. It has always been the expensive option — a 9.07% rate and a 4.228% fee for 2026–27, both well above the student loans — and it's the parent's debt, not the student's. But until now it had no borrowing limit: a parent could borrow up to the full cost of attendance. As of July 1, 2026, that's over. Parent PLUS is capped at $20,000 per year and $65,000 in total per student. It's a meaningful shift: families who once treated Parent PLUS as a bottomless backstop now have a hard ceiling, which makes saving ahead and borrowing early in the cheaper student loans matter more than before.

This is one piece of a larger 2025 law that reshaped federal student aid, with most provisions taking effect in 2026. We cover the rest of those changes — repayment plans, the end of Grad PLUS, and more — in a companion article; here we're focused on the structure and the current numbers an undergraduate family will actually use.

The Fine Print That Matters

Rates are fixed; fees come off the top.

Every federal loan carries a fixed rate — it's set when the loan is disbursed and never changes for the life of that loan. The 2026–27 rates are 6.52% for both Direct Subsidized and Unsubsidized loans and 9.07% for Parent PLUS. A loan you take this year keeps its rate until it's paid off, even if next year's loans are priced differently.

There's also an origination fee, deducted before the money reaches the school: 1.057% on Direct Loans and 4.228% on Parent PLUS. It's easy to overlook because you never see it, but it means you repay slightly more than actually landed on your tuition bill — and on Parent PLUS, that fee is more than four times larger.

Paying It Back

Lower payments aren't the same as lower cost.

Student loans don't come due while you're enrolled; repayment begins after you leave school and use up the six-month grace period. The standard plan repays over ten years. You'll be offered ways to lower the monthly payment — chiefly by stretching repayment over more years — and it's worth remembering the trade-off that runs through all of borrowing: a longer term shrinks the monthly bill but adds months of interest, so the lifetime cost goes up. "What's the monthly payment?" and "what does this cost in total?" are different questions, and only the second one tells you whether you borrowed well.