<prompt> Human: Hi all,I have a conundrum. My wife and I both make good salaries 9k home a month take home after taxes, insurance, 401k, etc. After all of the bills and expenses, we have about 3700 in expendable income. We have three student loans:My loan: 9600 at 2.5 adjustable! private loanMy other loan: 64000 at 5.5 fixed federal loanWife loan: 40k at 6.5 fixed federal loanWe have 35k in the bank and I want to put some of the money toward my student loans.Now, if I was a financial robot, I would put all of the money to my wifes loan as its the higher interest rate, BUT to me the private loans have much more risk because 1 no modification of payments or deferments and 2 unknown risk and exposure to sudden interest rate spikes.tldr; Put 10k on my private student loans or put 10k toward federal loans?Edit: Formatting.  <response>: Yes, the interest rate may go up at some point, but the decision you make now should reflect the interest rate right now. As opposed to putting the money into your wifes loan, youre effectively losing an extra 4 per year if you put it into your private loan.You can always switch your payments to your loan if the interest rate goes up, but dont start worrying about that until it happens. 