Contract bonds. These back construction work. A bid bond guarantees that a contractor who wins a bid will sign the contract and provide the required bonds; a performance bond guarantees that the work will be completed under the contract's terms; and a payment bond guarantees that subcontractors and suppliers will be paid. The Miller Act, 40 U.S.C. 3131, requires a contractor awarded a federal construction contract above a dollar threshold to furnish both a performance bond and a payment bond "with a surety satisfactory to the officer awarding the contract", and the payment bond generally must equal the contract amount. The SBA guarantees bid, performance and payment bonds issued by participating surety companies, so that a small contractor that does not yet meet a surety's standards on its own can still be bonded.
License and permit bonds. A state can make a bond a condition of doing business. Oklahoma's Home Service Contract Act, for example, accepts a surety bond as one form of the financial security a home warranty company must place in trust with the Insurance Commissioner. When a business that must be bonded fails to meet the obligation the bond backs, the protected party, which may be the state or a customer, can claim against the bond up to its amount.
Court and fiduciary bonds. Courts use bonds to protect the people whose money a fiduciary controls. In Virginia, for example, a person named in a will as executor may not exercise the executor's powers until qualifying "by taking an oath and giving bond", and the court or clerk may allow a fiduciary to give bond without surety where the estate is small. Whether a will can waive the surety, and how much discretion the court keeps, is set by each state's probate law. A guardian or conservator can face the same requirement.
Why a surety underwrites like a lender. Because the principal stays primarily liable, a surety decides whether to issue a bond by judging whether the principal can perform and pay, which the SBA describes as a surety's "credit, capacity, and character" requirements. A surety that pays a claim can then look to the principal for the money. Montana's suretyship statute, for example, says that a surety that satisfies the principal obligation is owed reimbursement by the principal of "what the surety has disbursed, including necessary costs and expenses." For bonds the federal government accepts, the Treasury publishes Department Circular 570, the list of companies approved to write or reinsure federal bonds.