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From the 568 instructions:

LLCs Classified as Partnerships File Form 568

LLCs may be classified for tax purposes as a partnership, a corporation, or a disregarded entity. The LLC must file the appropriate California tax return for its classification. LLCs classified as a:

• Partnership file Form 568, Limited Liability Company Return of Income.
• General corporation file Form 100, California Corporation Franchise or Income tax Return.
• S corporation file Form 100S, California S Corporation Franchise or Income Tax Return.
• Disregarded entities, see General Information S, Check-the-Box Regulations.