Students who borrow money for education through Stafford loans cannot exceed certain aggregate limits for subsidized and unsubsidized loans. For undergraduate students, these amounts are $23,000 in subsidized and $34,500 in unsubsidized loans.[6] Once a student has borrowed the maximum amount s/he is eligible for (based on grade level, such as undergraduate, graduate/professional, etc.), in subsidized loans, the student has the option to take out a loan in an additional amount less than or equal to the amount s/he would have been eligible for in subsidized loans. Once both the subsidized and unsubsidized aggregate limits have been met for both subsidized and unsubsidized loans, the student is unable to borrow additional Stafford loans until a portion of the borrowed funds has been paid back to the respective lender(s). Once the student has paid back some of these amounts, s/he will regain eligibility up to the aggregate limits as before.