Much has been made of the fact that Mitt Romney pays a much lower tax rate than many middle-class Americans. In part, this is because Romney derives more of his earnings from investments than the typical American, and capital gains are taxed at a lower rate than wages and many other forms of interest. Curiously, while people may resent Romney for having more money yet paying a lower tax rate than they do, many of those same people probably envy him as well -- if not for his wealth, then probably for that low tax rate. The fact is, people go to great lengths to try to minimize their tax liabilities -- so much so that these strategies are sometimes counterproductive. Here are three concepts to keep in mind when managing the tax consequences of your investments.