How much you can borrow in private student loans depends on three things working together: the cost of attendance your school certifies, the aggregate cap your lender sets, and whether your credit (or a co-signer’s) supports the amount you’re asking for. There is no federal dollar limit on private student loans the way Congress caps federal loans, so the ceiling is set school by school and lender by lender. Two students at the same university can end up approved for very different amounts.
Your School’s Cost of Attendance Sets the Ceiling
Every school calculates a cost of attendance figure that sets the outer limit for all financial aid, private loans included. That budget covers tuition, fees, housing, meals, books, supplies, transportation, and personal expenses.1Federal Student Aid. Cost of Attendance (Budget) The school decides what counts and how much each category is worth, not the lender.
Your private loan cap 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 will fund for 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) Request more than that certified amount and the lender reduces the loan automatically.
If your real expenses run higher than the standard budget, you can ask the financial aid office for a cost of attendance adjustment. Common reasons include childcare, a required computer purchase, medical costs, or rent above the school’s average. Schools evaluate these one at a time and generally want documentation such as receipts or invoices. A successful appeal raises the certified figure, and with it the maximum you can borrow privately.
Lender Aggregate Caps by Degree Level
Every lender layers its own limits on top of the school’s ceiling. There’s an annual cap (the most you can receive in one academic year) and an aggregate cap (the total you can carry across all your years of school). Most lenders set the annual cap at 100 percent of cost of attendance minus other aid. The aggregate cap is where lenders differ.
For undergraduate borrowers, aggregate private loan caps commonly range from about $100,000 to $225,000. Some lenders publish a dollar figure; others simply allow up to 100 percent of the cost of attendance each year without stating a lifetime ceiling. Graduate students generally qualify for more, and students in medical, dental, or law programs can often access the highest amounts, sometimes $250,000 or more over the course of the program, because projected post-graduation income lowers the lender’s risk.
Most lenders also set a minimum loan amount per application, usually $1,000 to $2,000. Small loans like that are common when a student needs to cover a leftover balance for books or supplies after tuition has been paid from other sources.
None of these caps are set by federal statute. Lenders adjust them based on their own risk models, and the numbers can shift from year to year. If you expect to borrow across multiple years, comparing aggregate caps across several lenders before you apply is worth the time.
How Your Credit and a Co-signer Affect the Amount
Where you land inside a lender’s range depends on your credit profile, your income, your existing debt, 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, along with steady income and manageable debt. Lenders calculate your debt-to-income ratio (your total monthly debt payments divided by your gross monthly income) to see whether you can absorb another payment. A lower ratio helps both your approval odds and your rate.
Most students applying for private loans need a co-signer, typically a parent or another adult with established credit. A co-signer with strong credit can qualify you for a higher borrowing limit and a lower rate than you’d get alone.2Consumer Financial Protection Bureau. What Is a Co-signer for a Student Loan? The co-signer is fully responsible for the debt, and the loan appears on their credit report.
Interest rates across major lenders generally run from roughly 3 percent to 18 percent APR, with borrowers who have strong credit and a co-signer landing at the lower end. Rate matters for what you’ll pay, but it also affects how much a lender is willing to extend to you in the first place, because higher-risk borrowers hit caps sooner.
Some lenders offer a co-signer release once you’ve shown you can repay on your own, typically after 24 to 48 consecutive on-time payments and a fresh credit and income check. Not every lender offers release, so if that matters to you, confirm it before you borrow.
Why Federal Caps Push Students Toward Private Borrowing
Federal student loans come with firm annual and lifetime limits. 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, a single year of tuition alone can exceed those figures, which is what drives students into the private market.
Graduate and professional borrowing is about to tighten further. Starting in July 2026, the One Big Beautiful Bill Act eliminates the Grad PLUS program, which previously let graduate students borrow up to the full cost of attendance with no aggregate cap. New graduate borrowers will be limited to $20,500 per year with a $100,000 lifetime cap, and professional-degree students (law, medicine) to $50,000 per year with a $200,000 lifetime cap. A new combined lifetime cap of $257,500 will apply across all federal student loans.4U.S. Department of Education. U.S. Department of Education Concludes Negotiated Rulemaking Session to Implement One Big Beautiful Bill Acts Loan Provisions Graduate and professional students who enroll after that date will likely need to lean much harder on private loans than earlier classes did.
What Private Loans Won’t Do for You
Borrowing capacity is only part of the picture. Private student loans do not offer income-driven repayment plans or loan forgiveness programs.5Consumer Financial Protection Bureau. Options for Repaying Your Federal and Private Student Loans If you fall behind after entering repayment, private lenders are not required to offer forbearance or any other relief. Some do allow temporary pauses, but the terms vary and interest generally keeps accruing. Federal loans max out lower, but they carry protections the private market doesn’t match. Borrow federal first, then use private loans to fill what remains of your certified cost of attendance.