Before you go throwing darts on Wall Street, check to make sure you can't earn a higher rate of return simply by investing in your own debt! For example, if you have a credit card balance that's costing you 19% per year, and you increase your payment, you will get a guaranteed 19% return on your investment. What's more, your earnings will be tax-free! So use this JavaScript Calculator to see how much you could be earning if you increased your payment on any one of your debts.