Unsubsidized Government Loans
Several types of unsubsidized student loans are available. The most common is the unsubsidized Stafford loan from the federal government, which has an interest rate of 6.8 percent as of July 2011. The other major unsubsidized federal loan is the PLUS loan for graduate students and parents of undergraduate students. Neither of these have limited funds, so you can reinstate the loan after you decline it. Some states also offer unsubsidized loans to students who reside in the state. You should also be able to reinstate a state loan, but the rules will vary from one state to another.
How to Reinstate
Contact the financial aid office at your school as soon as you change your mind and want to get your unsubsidized loan after all. The staff will probably have a form that you need to fill out to request the loan again. The loan funds will not arrive immediately, so if there is an impending due date for tuition or other bills for the college, discuss this with the financial aid office and see if there is anything you can do to avoid late penalties.
You can request an unsubsidized loan for any amount up to the maximum allowable by law. Stafford and PLUS loans both have an absolute maximum of the difference between the cost of attending your school and the amount of the other financial aid you have received. You can never borrow more than the cost of attendance. Unsubsidized Stafford loans also limit your borrowing to a specific cap that ranges from $5,500 to $20,500 as of July 2011. The cap is based on your year in school and whether or not you are considered a dependent student.
Private Student Loans
Private student loans are almost always unsubsidized, but reinstating a loan after you have declined it is a much more complicated process. Approval for a private loan requires an application and credit check, and once you have declined a loan, you must start the process all over again. You are not guaranteed to be approved for the amount or interest rate you were offered the first time.