There is no fixed dollar maximum on how much you can borrow in private student loans. The ceiling is your school’s certified cost of attendance minus any other financial aid you receive, and within that ceiling the amount you actually qualify for depends on the lender’s own annual and aggregate caps and on your credit (or your co-signer’s). Two students at the same school, in the same program, can end up approved for very different amounts.
Cost of Attendance Sets the Ceiling
Every school calculates a cost of attendance figure that caps all financial aid combined, including private loans. The budget covers tuition, fees, housing, meals, books, supplies, transportation, and personal expenses, and the school decides what counts and how much each category is worth.1Federal Student Aid. Cost of Attendance (Budget)
Your private loan limit starts with that number and subtracts everything else you’re already receiving: federal loans, grants, scholarships, work-study, and any other aid. If the cost of attendance is $55,000 and you have $22,000 in other aid, the most a private lender can fund that year is $33,000. Before any money moves, the lender sends a certification request to your financial aid office, and the school confirms the remaining gap.1Federal Student Aid. Cost of Attendance (Budget) Ask for more than the certified amount and the lender reduces the loan automatically.
How Degree Level Changes the Number
Your program shapes how much lenders are willing to extend. Undergraduate borrowers face the tightest limits because projected post-graduation income is lower and less certain. Graduate students in fields such as engineering or business generally qualify for higher amounts. Students in medical, dental, or law programs can often access the highest caps, sometimes $250,000 or more over the life of the program, because the statistical likelihood of high earnings reduces default risk.
At the other end, most lenders require a minimum loan amount per application, usually $1,000 to $2,000. Small loans like these are common when a student needs to close a last gap for books or supplies after tuition has been paid from other sources.
Lender Aggregate Limits to Compare Before You Apply
Beyond the cost of attendance, each lender imposes its own ceilings. These come in two forms. An annual limit sets the most you can receive in a single academic year, and most lenders set it at 100 percent of cost of attendance minus other aid. An aggregate limit sets the total you can carry across all your years in school, and this one varies widely.
For undergraduates, aggregate private loan limits commonly run from about $100,000 to $225,000, depending on the lender. Some lenders state a dollar aggregate cap; others simply allow up to 100 percent of the cost of attendance each year without a stated ceiling. Graduate and professional students generally qualify for higher aggregates, and some lenders allow $300,000 or more for medical and law programs.
None of these numbers are set by federal statute. Lenders adjust them based on their own risk models, and the caps change from year to year. If you expect to borrow across multiple years, compare aggregate limits at several lenders before you sign on with one.
What Credit and a Co-signer Do to Your Limit
Where you land inside a lender’s range depends on your credit profile, income, and whether you bring a co-signer. To qualify on your own, most lenders look for a credit score in the mid-600s or higher, steady income, and a manageable debt-to-income ratio (your total monthly debt payments divided by your gross monthly income). A lower ratio improves both your odds of approval and the rate you’re offered.
Most students applying for private loans need a co-signer, typically a parent or other adult with established credit. Adding a co-signer with a strong credit history can qualify you for a higher borrowing limit and a lower interest rate than you could get alone.2Consumer Financial Protection Bureau. What Is a Co-signer for a Student Loan? The co-signer takes on full legal responsibility for the debt. The lender can pursue them for missed payments, and the loan appears on their credit report.
Rates across major lenders generally run from roughly 3 percent to 18 percent APR. Borrowers with strong credit and a co-signer qualify at the lower end; thinner credit histories pay more. Rate affects the loan’s cost, not its size cap, but a higher rate can shrink how much borrowing you can actually afford to carry.
When Your Costs Exceed the Standard Budget
If your real expenses run higher than the school’s standard budget, because of childcare, a computer purchase, medical costs, or higher-than-average rent, you can ask the financial aid office for a cost of attendance adjustment. Schools evaluate these requests individually and typically require documentation such as receipts or invoices. A successful appeal raises the certified amount, which in turn raises the maximum a private lender can fund.
Why Federal Caps Push Students Into Private Borrowing
Federal student loans carry strict annual and lifetime caps. A dependent undergraduate can borrow a combined maximum of $31,000 in federal Direct Loans across a full undergraduate program. An independent undergraduate tops out at $57,500.3Federal Student Aid. Volume 8, Chapter 4 – Annual and Aggregate Loan Limits At many private universities, tuition alone can clear those amounts in a single year, which is what pushes families into the private market in the first place.
Starting in July 2026, the One Big Beautiful Bill Act tightens federal borrowing for graduate and professional students considerably. The law eliminates the Grad PLUS program, which had let graduate students borrow up to the full cost of attendance with no aggregate cap. New graduate borrowers are capped at $20,500 per year with a $100,000 lifetime limit. Professional degree students, such as those in law or medicine, are capped at $50,000 per year with a $200,000 lifetime limit.4U.S. Department of Education. U.S. Department of Education Concludes Negotiated Rulemaking Session to Implement One Big Beautiful Bill Acts Loan Provisions The law also creates a new combined lifetime cap of $257,500 across all federal student loans. Graduate and professional students enrolling after July 2026 will likely need substantially more private borrowing than earlier classes did, which makes lender aggregate caps a bigger factor in planning than they used to be.