Uniform Commercial Code (UCC): Key articles include Article 5 (Letters of Credit), Article 3 (Negotiable Instruments), and Article 1 (General Provisions). Forms the fundamental framework for commercial transactions in the US.

State-Specific Surety Laws: Varying state-level requirements for surety bonds and state insurance regulations that govern guarantee bonds. Each state may have different requirements and regulatory frameworks.

The Miller Act: Federal legislation requiring performance bonds and payment bonds for federal construction projects. Important consideration if the counter guarantee relates to federal projects.

Contract Law Principles: Common law principles of contract formation, state-specific contract requirements, and Statute of Frauds requirements that govern contract validity and enforcement.

Banking Regulations: Federal Reserve regulations and FDIC requirements that may apply when regulated financial institutions are involved in the guarantee arrangement.

International Banking Standards: UN Convention on Independent Guarantees and Stand-by Letters of Credit, ICC Uniform Rules, and considerations for foreign sovereign immunity if international parties are involved.

Bankruptcy Law: Regulations governing the treatment of guarantees in bankruptcy proceedings and priority rules that may affect the guarantee's enforcement.

Securities Laws: Securities Act of 1933 and Securities Exchange Act of 1934 provisions that may apply if the guarantee arrangement involves regulated securities.