A cosigner may be required when a private lender determines that the student does not independently meet its credit or income requirements. This is common for students who have little credit history, limited income, or other factors that make the lender view the application as higher risk.

A cosigner essentially agrees to share responsibility for repaying the loan. If the student misses payments or defaults, the cosigner can potentially be responsible for the debt, and the missed payments may affect both parties’ credit histories.
Federal student loans generally work differently and typically don’t require a cosigner in the same way private loans can.

That’s one reason students should understand their federal borrowing options before turning to private financing.
If a lender requires a cosigner, don’t automatically choose the first available option. Compare the interest rate, fees, repayment terms, and whether the lender offers a future cosigner-release option. Also borrow only what is necessary, because both the student and cosigner may have long-term financial obligations.