What are some advantages and disadvantages of selecting to be a S Corporation compared to other entities?

Some advantages are: there is limited liability; and the entity avoids double taxation of profits as is the case with C Corporations. The profits that are passed through to the shareholders are not subject to SE tax as in a partnership. Some disadvantages are: that the shareholders pay tax on earnings even if they are undistributed; the contributions limits to a qualified retirement plan are based on shareholder/employee wages, not the overall profits as with a Sole proprietorship; and it is less flexible in choosing a tax year.