Operating as an S corporation may help reduce federal employment taxes for small businesses in the right circumstances. Although S corporations may provide tax advantages over C corporations, there are some potentially costly tax issues that you should assess before making a decision to switch. Here’s a quick rundown of the most important issues to consider when converting from a C corporation to an S corporation: Built-in gains tax Although S corporations generally aren’t subject to tax, those that were formerly C corporations are taxed on built-in gains (such as appreciated property) that the C corporation has when the S election becomes effective, if those gains are recognized within 5 years after the corporation becomes an S corporation. This is generally unfavorable, although there are situations where the S election...