State-specific LLC Acts: Primary legislation that varies by state, including default rules that can be modified by agreement and state-specific filing requirements. Each state has its own unique LLC legislation that must be considered.

Internal Revenue Code: Federal tax regulations including check-the-box regulations, partnership taxation provisions, and special allocations rules under Section 704(b) that affect LLC tax treatment.

Securities Laws: Including Securities Act of 1933 and State Blue Sky Laws, particularly relevant if membership interests might be considered securities.

State Corporate Laws: While not directly governing LLCs, these laws often influence LLC law interpretation and provide important legal context.

Uniform Limited Liability Company Act (ULLCA): Model legislation adopted by some states that provides standard guidelines for LLC governance, useful for interpretation even in non-adopting states.

Employment Laws: Relevant when the LLC has employees or deals with manager classification issues, affecting operational structure and obligations.

State Contract Laws: General contract formation principles and enforceability requirements that apply to operating agreements as legally binding contracts.