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Should we prepay our private student loans, given our particular profile?
Based on your numbers, it sounds like you've got 12 years left in the private student loan, which just seems to be an annoyance to me.  You have the cash to pay it off, but that may not be the optimal solution. You've got $85k in cash!  That's way too much. So your options are:  -Invest 40k -Pay 2.25% loan off -Prepay mortgage 40k Play around with this link: mortgage calculator Paying the student loan, and applying the $315 to the monthly mortgage reduces your mortgage by 8 years. It also reduces the nag factor of the student loan. Prepaying the mortgage (one time) reduces it by 6 years. (But, that reduces the total cost of the mortgage over it's lifetime the most) Prepaying the mortgage and re-amortizing it over thirty years (at the same rate) reduces your mortgage payment by $210, which you could apply to the student loan, but you'd need to come up with an extra $105 a month.