Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

Student loan payments and opportunity costs
My recommendation would be to pay off your student loan debt as soon as possible. You mention that the difference between your student loan and the historical, long-term return on the stock market is one-half percent.  The problem is, the 7% return that you are counting on from the stock market is not guaranteed.  You might get 7% over the next few years, but you also might do much worse.  The 6.4% interest that you will save by aggressively paying off your debt is guaranteed. You are concerned about the opportunity cost of paying your debt early.  However, this cost is only temporary.  By drawing out your debt payments, you have a long-term opportunity cost.  By this, I mean that 4 years from now, you could still have 6 years of debt payments hanging over your head, or you could be debt free with all of your income available to save, spend, or invest as you see fit. In my opinion, prolonging debt just to try to come out 0.5% ahead is not worth the hassle or risk.