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I just closed on a mortgage with 55k in student debt. Using 1% I was required to put 550/month toward my debt to income ratio. I am currently on an income based repayment plan where my actual payment is $70/Month. It took a lot of work, but I was able to find a lender "Trustmark" who would work with me and use my actual payment instead of the 1%. I was not able to find anything on the internet where this has been done before, but it worked for me. I should also note that I was applying for a USDA loan. My advice to you is to find a good mortgage broker with connections.
Standard rules state that you have to use 1% min payment in your DTI calculation. There is a way around it though