I hope you are merely being sloppy with your words here. In California, a single member LLC is NOT disregarded - it is a valid LLC and affords limited liability protection to its single member. It is disregarded for tax purposes only. Likewise, an LLC with multiple members does not "operate as a partnership", it operates as a multi member LLC. It may be TAXED as either a partnership or a corporation. This sort of confusion may have been what led to some comment up thread that an LLC taxed as a partnership resulted in its members being personally liable for LLC taxes.