Honestly, if it were me and I had the cash, I would probably just pay out of pocket. Even if the interest is deductible, it's also a loan that you can't get rid of through bankruptcy. And that's a pretty hefty interest rate. If you have cash, can you get an unsecured loan with a lower interest rate? It wouldn't be deductible, but if you could get a regular loan at 3-4% somehow you would come out ahead. I'm assuming that you're going to grad school for only 2 years?