Choosing the right business entity has many implications, including the amount of your tax bill. The most common business structures are sole proprietorships, partnerships, limited liability companies, C corporations and S corporations. In some cases, a business may decide to switch from one entity type to another. Although S corporations can provide substantial tax benefits over C corporations in some circumstances, there are potentially costly tax issues that you should assess before making the decision to convert from a C corporation to an S corporation. Here are four considerations: 1. LIFO inventories. C corporations that use last-in, first-out (LIFO) inventories must pay tax on the benefits they derived by using LIFO if they convert to S corporations. The tax can be spread over four years. This cost must be weighed against the potential tax gains from...