A surety is a person who agrees to be responsible for the debt or obligation of another. The situation in which a surety is most typically required is when the ability of the primary obligor or principal to perform its obligations under a contract is in question, or when there is some public or private interest which requires protection from the consequences of the principal's default or delinquency. In common law jurisdictions, a contract of suretyship is subject to the statute of frauds and is only enforceable if memorialized by a writing signed by the surety.

If the surety is required to pay or perform due to the principal's failure to do so, the law will usually give the surety a right of subrogation, allowing him to recover the cost to him of making payment or performance on the principal's behalf, even in the absence of an express agreement to that effect between the surety and the principal.

Under Article 3 of the Uniform Commercial Code, a person who signs a negotiable instrument as a surety is termed an accommodation party; such a party may be able to assert defenses to the enforcement of an instrument not available to the maker of the instrument.

See also

• guarantee
• surety bond