How Dental School Loan Interest Accrues While You’re Still in School

There is a line item on your dental school bill that no admissions page will ever show you, and in our model it runs from $65,832 to $152,600 per student: the interest that accrues on your loans while you are still in school. Federal graduate loans are unsubsidised. They start charging interest the day the money arrives, not the day you graduate, and the money you borrow in August of D1 has been growing for four years before you see your first patient as a licensed dentist.

This guide explains the mechanism, shows the number for every school, and, because you are a pre-dental student and not a finance major, does the arithmetic in the open.

On the figures in this guide: dollar amounts from our cost model are estimates built from published cost-of-attendance data circa 2022, and unless a row says in-state they are out-of-state or private figures. Where we say “projected” we have grown the 2022 figure at 4% a year to 2026. Federal loan rules, interest rates and program terms are quoted as published for 2026–27 and can change; confirm anything you plan around with the school’s financial aid office and at studentaid.gov. Nothing here is financial advice.

How in-school interest works

Say you borrow $50,000 on the first day of D1 at the 2026–27 rate of 8.07%. Interest accrues daily. Over four years of school, with nothing paid:

• Simple interest accrues at about $4,035 a year, so roughly $16,140 by graduation on that single loan.
• Federal loans do not compound while you are enrolled; accrued interest sits beside the principal until a capitalisation event, typically the end of your grace period, when it is added to the principal and starts earning interest itself. From that point you pay interest on interest.
• Private loans often capitalise more frequently, sometimes annually, in which case the same $50,000 would grow to about $68,201 instead.

Now repeat that for a D2 loan that grows for three years, a D3 loan for two and a D4 loan for one, and you have the shape of the number below.

The interest bill at every school, ranked

Our model assumes the full cost of attendance is borrowed each year, with interest accruing through graduation at the federal rates in force when the source data was published (6.6% Direct Unsubsidized, 7.6% Grad PLUS). Today’s rates are higher and the private loans that now fill the gap above the federal cap are higher again, so treat every figure as a floor. The twelve largest interest bills:

The median across all 64 schools is $116,667, about 27% of the amount borrowed. Every row is on the cost comparison tool.

Why the interest bill tracks the seat, not the student

Interest is a percentage of what you borrow, so the cheapest seat produces the smallest interest bill automatically. Texas A&M / Baylor’s $65,832 against Midwestern IL’s $152,600 is a difference of $86,768 in interest alone, before a single dollar of tuition. That gap is set by the admissions decision, and the DAT is the last number on a completed application that still influences it.

Four ways to shrink it

• Borrow less than the cost-of-attendance line. Schools budget living costs generously; every $1,000 you do not borrow in D1 is roughly $1,320 you do not owe at graduation.
• Pay the interest as it accrues, if you can. Even small payments during school stop the balance growing and prevent capitalisation of that interest.
• Fill the federal bucket first. Federal loans capitalise once, at repayment; some private loans capitalise yearly.
• Take the cheaper seat. Nothing else comes close. See the cheapest dental schools.