LLP, Limited Liability Partnership: a partnership where a partner's liability for the debts of the partnership is limited except in the case of liability for acts of professional negligence or malpractice. In some states, LLPs may only be formed for purposes of practicing a licensed profession, typically attorneys, accountants and architects. This is often the only form of limited partnership allowed for law firms (as opposed to general partnerships).
Since limited liability companies can be a pass-through entity, owners are taxed on their personal income. S-Corp shareholders are taxed personally. The S-Corp, however, is not. C-Corp income is taxed at the corporate level first, then again at the personal level. This is called "double taxation." Non-Profits are only taxed once and can write off most of their expenses. Sole Proprietors are taxed only on their personal tax return.
Despite being a relatively new option, the limited liability company (LLC) is now one of the most popular business structures among smaller organizations. While allowing business owners to remain free from a great deal of the regulations imposed on other types of companies, it still provides limited liability protection for its owners (members). This means that the personal assets of an LLC's ownership cannot be collected to fulfill the debts of the business.