Question about student loans under IBR...ok to file taxes jointly?

I am getting ready to have a baby and will be quitting my job soon. When I do, and my husband and I file jointly, will he be responsible for this debt? Will I qualify for IBR since I will not be showing income myself? He is a 1099 contract employee with a gross of approx 60k/yr. With the write-offs, he shows a fairly low taxable income. Will IBR be based on this adjusted amount if at all?