Determine whether your loan is listed as an eligible loan under the income-based repayment program. Eligible loans are those made under the Direct Loan or FFEL programs.
Calculate your total amount of student loan debt. If you do not have all your records, use the online database at studentaid.ed.gov to pull up all of the information on your loans, whether they are consolidated, defaulted or in repayment. The database will tell you the total of all of your federal student loans. If you don't have the exact total for your student loans, estimate them.
Use the income-based online calculator to figure out what your payment would be or if you qualify for the Income-Based Repayment program. The Department of Education online calculator is available at studentaid.ed.gov. Input the five pieces of necessary information -- your total adjusted gross income, estimated amount of qualifying student loans, the interest rate (which is provided in the form), state of residence and family size.
Call your loan holder to fill out its official application if you qualify. Call each company that services your student loans because you'll have to fill out an application for each one of them since all of your loans are separate.