Syag, I just found the webpage for you that discusses the income-based plans for Federal loans. I was going to post the link, but I think the mods don’t allow links to go through.
You can google and find the website for Federal Student Aid, an office of the US Dept. of Education.
Then go to the drop-down box for Types of Aid.
Click on loans.
Go to Subsidized and Unsubsidized Loans.
Then find the link that says “learn more about repayment options.”
After you click on that link, look for the following repayment plans (I think they are the last 3 listed):
IBR- Income based Repayment Plan
ICR – Income Contingent Repayment Plan
Income Sensitive Repayment Plan.
If you have trouble finding it the above way, maybe just try googling the names of the plans (IBR, ICR, etc)