A corporation is just that… a corporation. The IRS has very specific rules for a corporation to follow regarding how a tax return is filed. An LLC doesn’t have any specific set of tax laws to follow because the IRS considers them to be a unique entity. It can choose to file taxes like a sole proprietorship, a partnership, or a corporation. That gives the business owner the greatest amount of flexibility by allowing them to file like a sole proprietorship until it becomes more beneficial to file as a corporation.