If you’re an investor in mutual funds or you’re interested in putting some money into them, you’re not alone. According to the Investment Company Institute, a survey found 58.7 million households owned mutual funds in mid-2020. But despite their popularity, the tax rules involved in selling mutual fund shares can be complex. What are the basic tax rules? Let’s say you sell appreciated mutual fund shares that you’ve owned for more than one year, the resulting profit will be a long-term capital gain. As such, the maximum federal income tax rate will be 20%, and you may also owe the 3.8% net investment income tax. However, most taxpayers will pay a tax rate of only 15%. When a mutual fund investor sells shares, gain or loss is measured...