Accord and satisfaction is a two-step defense to a contract or debt claim. The 'accord' is a new agreement between the parties to settle an existing obligation with a different performance than originally due -- typically a lesser payment. The 'satisfaction' is the actual completion of that new agreement. Until the satisfaction occurs, the original obligation remains fully enforceable; the accord alone does not discharge anything.

The doctrine most commonly arises in disputed-debt scenarios: a debtor sends a check for less than the full amount claimed, marked 'payment in full' or similar language, and the question becomes whether the creditor's acceptance of that check discharges the entire debt, including the disputed portion.

Courts generally require: (1) a bona fide dispute over the amount or existence of the underlying obligation -- an accord cannot ordinarily discharge an undisputed, liquidated debt for less than its full amount, because that would lack consideration; (2) an agreement (the accord) between the parties to accept a different, usually lesser, performance in full satisfaction; and (3) actual performance of that new agreement (the satisfaction). If the debtor never actually pays what the accord called for, the creditor can sue on the original obligation as if the accord never happened.

Because the disputed-debt requirement functions as the consideration for the new agreement, a demand for partial payment on a debt the debtor admits is fully owed generally cannot support an accord and satisfaction -- the creditor is giving up something of value (the disputed portion) only where a genuine dispute existed.

The most litigated fact pattern involves a debtor tendering a check for less than the claimed amount, with a conspicuous notation that it is offered in full satisfaction. Under UCC § 3-311, adopted in some form in most states for transactions involving negotiable instruments, a creditor who cashes such a check generally discharges the full disputed claim, even if the creditor writes 'without prejudice' or otherwise attempts to reserve rights on the check itself -- with narrow statutory exceptions, such as when the creditor is a large organization that can show it did not have actual knowledge of the restrictive notation because of how it processes checks, and later timely refunds the payment.

Creditors seeking to avoid an inadvertent accord and satisfaction typically must reject and return the check rather than deposit it, or comply with the statute's specific procedures for protecting large-volume processors.

Accord and satisfaction discharges an existing obligation by substituted performance of the same basic debt relationship between the same two parties; novation substitutes an entirely new contract, often with a new party, and requires tripartite consent. A simple partial payment, without an accompanying agreement that it is offered and accepted in full satisfaction of a disputed claim, discharges only the amount actually paid and leaves the balance owing -- it is not accord and satisfaction at all.

The critical factual question in most disputes is not whether less money changed hands, but whether the creditor's acceptance was knowing and voluntary acceptance of the debtor's offer to fully settle a genuinely disputed claim.

In Juricratic, accord and satisfaction is modeled as a two-stage claim-path gate: the accord stage tests whether a bona fide dispute and a clear settlement offer existed, and the satisfaction stage tests whether performance under that offer was actually completed and accepted with the required knowledge. A defense-side simulation on a disputed check payment should dial the strength of the 'full satisfaction' notation and the creditor's actual knowledge of it, since UCC § 3-311's narrow large-organization exception is often the only escape hatch once a marked check has been cashed.

This makes the doctrine a fast, low-cost early motion candidate in collections and commercial-debt matters, where the underlying facts are usually undisputed and the fight is purely legal.