17.1 Impossibility, Impracticability, Frustration & Discharge

17.1 Impossibility, Impracticability, Frustration & Discharge

Excuse doctrines allocate the risk of events that neither party caused and the contract did not address. Before applying them, check the contract: a force majeure clause, a fixed-price term, or a risk-allocation clause may already answer the question. Discharge by later agreement is covered in the second half of this section.

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1. Supervening Changed Circumstances: Impossibility, Impracticability & Frustration

After contract formation, external events may fundamentally disrupt the contractual equilibrium. Modern contract law recognizes three distinct doctrines that excuse performance:

┌───────────────────────┬────────────────────────────────────────────────────────┐
│ Doctrine              │ Core Focus & Legal Threshold                           │
├───────────────────────┼────────────────────────────────────────────────────────┤
│ Impossibility         │ OBJECTIVE impossibility: performance cannot physically │
│                       │ or legally be done by ANYONE ('The thing cannot be     │
│                       │ done', not 'I cannot do it').                          │
├───────────────────────┼────────────────────────────────────────────────────────┤
│ Impracticability      │ Extreme, excessive, unreasonable cost, difficulty, or  │
│ (UCC § 2-615 / R. 261)│ injury caused by unforeseen supervening contingency;   │
│                       │ non-occurrence was a basic assumption of contract.     │
├───────────────────────┼────────────────────────────────────────────────────────┤
│ Frustration of Purpose│ Value of performance virtually destroyed; mutually     │
│ (*Krell v. Henry*)    │ understood principal foundation eliminated by event.   │
└───────────────────────┴────────────────────────────────────────────────────────┘

A. Common Doctrinal Elements

To discharge contractual performance under any of the three doctrines, four baseline elements must be met:

1. A supervening event occurred after contract formation;
2. The non-occurrence of that event was a basic assumption on which the contract was made;
3. The event occurred without the fault or negligence of the party seeking excuse; AND
4. The party seeking excuse did not explicitly or implicitly assume the risk of the event under the terms of the contract or trade usage.

B. Objective Impossibility

Impossibility discharges performance only when it is objective ("no one can do this") rather than subjective ("I personally cannot do this due to insolvency, lack of funds, or personal inability").

The Three Classical Categories of Impossibility:

1. Death or Incapacity of an Essential Person:
   • Applies only where the contract contemplates personal performance by a specific individual possessing unique skill, talent, or personal characteristics (e.g., portrait painter, famous singer, specialized consultant).
   • Does not apply to ordinary service contracts, construction agreements, or payment obligations, which bind the promisor's estate.
2. Destruction or Deterioration of Subject Matter (Taylor v. Caldwell (1863)):
   • In Taylor v. Caldwell, the defendant agreed to rent the Surrey Gardens and Music Hall for a series of concerts. Before the first concert, the hall accidentally burned to the ground. The court held that because the continued existence of the specific hall was essential to the performance, destruction of the hall discharged both parties from their obligations.
   • Source Specificity Requirement: Destruction of goods excuses a seller only if the specific source of supply was identified in the contract (e.g., "all oranges grown on my 40-acre Sunny Valley orchard"). If a seller contracts simply to sell "10,000 bushels of oranges" (fungible goods) and the seller's orange grove freezes, performance is not impossible—the seller must purchase substitute oranges on the open market.
   • Contractor Rule (New Construction vs. Renovation):
     • New Construction: Destruction of a building under construction by storm or fire does not discharge the builder, who can still rebuild and remains bound, although courts may excuse the resulting delay.
     • Renovation / Repair of Existing Structure: Destruction of the existing building discharges the contractor, who can recover in restitution for the value of work completed prior to destruction.
3. Supervening Illegality or Government Prohibition:
   • If a statute, executive order, or judicial decree enacted after contract formation makes the promised performance illegal, performance is discharged.

C. Commercial Impracticability (UCC § 2-615 & Restatement § 261)

Under modern law, actual physical impossibility is not required. Performance is excused under commercial impracticability if performance can only be accomplished at excessive and unreasonable cost, difficulty, or hazard.

The Extreme Cost Threshold

• Market Fluctuations Do Not Excuse: Ordinary increases in performance costs, inflation, supply shortages, or market price collapses do not discharge duties. Fixed-price contracts are designed precisely to allocate the risk of ordinary market fluctuations.
• Catastrophic Events: To discharge performance, the cost increase must be catastrophic, severe, and triggered by an unforeseen contingency (e.g., war, international embargo, crop blight, canal closure) that alters the essential nature of performance.
• UCC § 2-615 Partial Impracticability (Allocation): If an unforeseen contingency affects only a portion of the seller's capacity to deliver (e.g., an international fuel embargo), the seller is not completely discharged. The seller must allocate production and deliveries among customers in a manner that is fair and reasonable, seasonably notifying buyers of the estimated quotas.

D. Frustration of Purpose (Krell v. Henry (1903))

Under the doctrine of frustration of purpose, performance remains completely physically and legally possible, but a supervening event has completely or virtually destroyed the mutually understood principal purpose and value of the transaction for one party.

Canonical Origin: Krell v. Henry

The defendant rented a flat with a balcony overlooking the royal procession route for two days for the sole purpose of viewing the coronation procession of King Edward VII. The coronation was postponed due to the King's acute appendicitis surgery. The landlord sued for the unpaid balance.

• Holding: The English Court of Appeal discharged the renter. Although the physical rooms were still available, the coronation procession was the known foundation of the contract. The supervening cancellation completely destroyed the purpose of the agreement.

Required Elements for Frustration of Purpose:

1. The supervening event must virtually destroy the entire value of the transaction to the party;
2. The principal purpose must have been understood by both parties at the time of contracting (a unilateral secret purpose does not suffice);
3. The non-occurrence of the frustrating event was a basic assumption of the contract;
4. The party seeking discharge was not at fault and did not assume the risk.

• Example of No Frustration: A retailer leases a storefront in a shopping mall to sell athletic shoes. The mall's anchor department store goes bankrupt, reducing customer foot traffic by 40%. The retailer's lease is not frustrated; the storefront can still be used for retail sales, and reduced profitability is an inherent business risk.

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Comparison: Impossibility vs. Impracticability vs. Frustration of Purpose

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Applying the Excuse Doctrines

Cost Increases and Changed Routes

• Excused: A contractor that agreed to take gravel from a landowner's property was excused when the remaining gravel lay below water and could be extracted only at about ten times the normal cost (Mineral Park Land Co. v. Howard, Cal. 1916).
• Not excused: A shipper that had to sail around the Cape of Good Hope when the Suez Canal closed was not excused, because the longer route was still practicable and increased costs by only a modest percentage (Transatlantic Financing Corp. v. United States, D.C. Cir. 1966).

UCC Rules for Goods

• Casualty to identified goods (§ 2-613): If goods identified when the contract was made are destroyed without fault of either party before risk of loss passes to the buyer, a total loss avoids the contract. If the loss is partial, or the goods have deteriorated so they no longer conform, the buyer may either avoid the contract or accept the goods with an allowance from the price, but has no further claim against the seller.
• Substituted performance (§ 2-614): If the agreed berthing, loading, unloading, or type of carrier becomes unavailable without fault, but a commercially reasonable substitute is available, that substitute must be tendered and accepted.
• Allocation and notice (§ 2-615): A seller excused in part must allocate production and deliveries among customers in a fair and reasonable manner and must seasonably notify buyers of any delay or nondelivery and of their estimated quota.
• Buyer's response (§ 2-616): After receiving notice, a buyer may terminate the unexecuted portion of the contract or modify it by agreeing to take its available quota. If the buyer does not respond within a reasonable time not exceeding 30 days, the contract lapses as to the affected deliveries.

Temporary and Partial Excuse; Restitution

• Temporary impracticability suspends the duty only while it lasts, unless performance after the delay would be materially more burdensome (Restatement § 269).
• Partial impracticability leaves a duty to render whatever part of the performance remains practicable (Restatement § 270).
• Restitution after excuse: Either party may recover the value of benefits conferred by part performance before the discharging event, and courts may protect reliance to avoid injustice (Restatement §§ 272, 377). A painter whose client's house burns down midway through the job may recover the reasonable value of work done before the fire.
• Force majeure clauses: Contract clauses excusing performance for listed events are enforced according to their terms and may be broader or narrower than the common-law doctrines.

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2. Discharge of Duties

An absolute contractual duty may be discharged without breach by events occurring after contract formation:

┌───────────────────────┬────────────────────────────────────────────────────────┐
│ Discharge Mechanism   │ Core Legal Requirements & Effects                      │
├───────────────────────┼────────────────────────────────────────────────────────┤
│ Accord & Satisfaction │ Accord: agreement to accept different performance to   │
│                       │ satisfy existing duty. Suspends original duty.         │
│                       │ Satisfaction: execution of accord. Discharges both.    │
├───────────────────────┼────────────────────────────────────────────────────────┤
│ Novation              │ Agreement substituting a new obligor for an original   │
│                       │ obligor. Requires consent of ALL parties. Discharges.  │
├───────────────────────┼────────────────────────────────────────────────────────┤
│ Mutual Rescission     │ Mutual agreement to discharge executory duties.        │
│                       │ Both parties must have remaining performance due.      │
├───────────────────────┼────────────────────────────────────────────────────────┤
│ Release               │ Writing signed by obligee releasing obligor from duty. │
│                       │ Supported by consideration (or statutory substitute).  │
├───────────────────────┼────────────────────────────────────────────────────────┤
│ Account Stated        │ Agreement between parties settling liquidated balance. │
└───────────────────────┴────────────────────────────────────────────────────────┘

A. Accord and Satisfaction

• The Accord: An agreement in which an obligee promises to accept a substituted, different performance in full satisfaction of an existing contractual duty.
  • Effect of Accord: An accord does not extinguish the original duty; it merely suspends the obligee's right to enforce the original contract until the accord performance is completed or breached.
• The Satisfaction: The actual performance of the accord agreement.
  • Effect of Satisfaction: Once satisfaction occurs, both the accord agreement and the original underlying duty are completely discharged.
• Breach of the Accord:
  • If Debtor Breaches: The creditor may sue either on the original underlying obligation OR on the accord agreement.
  • If Creditor Breaches (sues on original debt before debtor breaches the accord): Debtor can raise the accord as an equitable defense to suspend or dismiss the action.
• Unliquidated / Disputed Debts ("Check Cashing"): Under UCC § 3-311, if a debtor sends a check marked "Payment in full" for an unliquidated or honestly disputed debt, and the creditor cashes/deposits the check, an accord and satisfaction is achieved immediately, discharging the debt even if the creditor writes "Under protest" on the check.

B. Novation

A novation occurs when the parties to an existing contract enter into a new agreement that substitutes a new party to take over the performance obligations of an original party, with the express or implied agreement of all three parties (obligee, original obligor, and new obligor).

• Legal Effect: A valid novation completely discharges the original obligor from all further contractual liability.
• MBE Distinction (Novation vs. Delegation):
  • In a delegation, the delegator remains secondarily liable on the contract if the delegatee defaults.
  • In a novation, the obligee expressly agrees to release the original obligor and look solely to the new party. The original party's liability is extinguished.

C. Mutual Rescission

An agreement between the parties to cancel their contract.

• Executory Requirement: Mutual rescission is legally effective only if both parties still have executory duties remaining to be performed under the contract.
• Unilateral Performance Complete: If one party has fully performed their contractual duties, a mutual rescission agreement is void for lack of consideration, because the fully performing party is giving up rights without receiving any legal return value (unless supported by a formal release or new consideration).

D. Release and Destruction of Subject Matter

• Release: A formal written document signed by the obligee releasing the obligor from a contractual duty. Under modern law, a signed writing or formal release discharges the duty without separate consideration in most commercial jurisdictions.
• Destruction of Subject Matter: If the specific, unique subject matter essential to performance is destroyed without fault of either party, all executory duties are discharged under the doctrine of impossibility (e.g., concert hall burns down before scheduled performance).

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Substituted Contracts Versus Executory Accords

• Executory accord: The creditor agrees to accept a different performance in the future. The original duty is suspended, not discharged, until the substituted performance is rendered (Restatement § 281).
• Substituted contract: If the creditor agrees to accept the new promise itself—rather than its performance—in immediate satisfaction of the original duty, the original duty is discharged at once, and the creditor's only remedy is on the new contract (Restatement § 279).
• How to tell: Courts look at the parties' intent. When the original claim was disputed or unliquidated, or the new agreement is formal and comprehensive, courts more readily find a substituted contract; when the creditor bargains for actual performance of a small, undisputed debt, courts usually find an executory accord.