General average: why undamaged cargo can share a casualty cost
Understand general average, bonds and guarantees, contributory values and insurance through a worked example showing why undamaged cargo can still contribute.
On this page
General average shares qualifying extraordinary sacrifices and expenses between the contributing interests in a common maritime adventure. It is an adjustment of those interests, separate from deciding fault or whether an insurer must pay. Cargo can arrive intact and still face a contribution.
What you will learn
- Recognise the distinction between accidental damage and a qualifying general average sacrifice or expense.
- Explain the purpose of an average bond, guarantee and contributory valuation.
- Follow a simplified contribution calculation and identify what it leaves out.
Your goods are intact. Why has a contribution been requested?
A buyer receives notice that a ship carrying its machinery has suffered a serious fire. The machinery itself is dry and undamaged. Before delivery, however, the buyer is asked for general average security. It is an unfamiliar demand: why should a business pay when its own goods have escaped the damage?
The answer begins with the measures taken for the shared venture. A deliberate sacrifice or extraordinary expense may have helped preserve the ship and cargo from a common peril. General average, usually shortened to GA, provides a framework for sharing qualifying sacrifices and expenditure between contributing interests. It does not divide every casualty bill among everyone on board.
The buyer’s physical damage claim, any contribution owed and any recovery against the carrier are separate questions. A useful file keeps those questions connected without treating them as interchangeable.
The casualty and the general average act are different things
An accidental fire is a casualty. Deliberately using water to extinguish it may damage cargo that the fire had not reached. The accidental fire damage and the damage caused by the firefighting measure therefore need separate treatment.
For this guide, the contractual reference is the York-Antwerp Rules 2016, including the technical amendment to the interest provision made in 2022. These rules are commonly incorporated into carriage contracts; they are not a convention that automatically governs every shipment. The version actually incorporated, together with the relevant law and contract, must be identified. An older edition is not replaced merely because a newer text exists.
The central enquiry is whether an extraordinary sacrifice or expenditure was deliberately and reasonably undertaken to preserve property in the common venture from peril. The detailed rules then determine particular allowances. Firefighting-water damage can qualify under Rule III, whereas smoke or heat damage from the fire is treated differently. Ordinary repairs to accidental damage do not become GA simply because completing them allows a voyage to resume.
That is why a notice that GA has been declared starts an adjustment process. It is not, by itself, proof that every expense claimed is allowable.
Who contributes, and what does the adjuster do?
Ship and cargo interests are the familiar contributors. Freight genuinely at risk, separately owned bunkers and other property interests may also matter. The commercial arrangements determine which interests exist; a list of company names is not enough.
An average adjuster investigates the allowances, obtains the necessary accounts and valuations, and prepares the allocation. The file needs evidence of what was done, why it was done and what it cost. It also needs the values against which the eventual contribution is assessed.
For a cargo receiver, that means a commercial invoice and transport documents can matter even where there is no damage to survey. For the ship interest, casualty records, expenditure accounts and the valuation of the vessel may all be relevant. Our claims-process guide explains why establishing cause, amount and cover usually proceeds along several tracks.
The adjustment is not a finding that each contributor caused the incident. GA and fault are different enquiries, although fault can affect enforceability and rights of recovery.
Security allows delivery before the final figures are known
The adjustment may take considerably longer than the physical movement of the goods. Security is intended to protect the potential contribution while allowing the cargo-release arrangements to proceed.
| Document or request | Practical purpose | What it does not establish |
|---|---|---|
| Average bond | Records the cargo interest’s undertaking concerning the contribution ultimately due under its terms | The final amount of the contribution |
| Insurer’s average guarantee | Provides the agreed insurer-backed security for that obligation | That every separate cargo claim is covered |
| Cash deposit | Can provide security where an acceptable guarantee is unavailable | A final adjustment or a standard percentage applying to every casualty |
| Valuation and shipment documents | Identify the interest and support the adjustment | Automatic acceptance of the values supplied |
The wording and acceptability of the security require attention. A receiver should identify the appointed adjuster and coordinate with its cargo insurer or broker rather than assume a certificate of insurance is itself the requested guarantee. An uninsured interest may need to provide a deposit or another acceptable arrangement.
GA security and salvage security are separate. Providing one does not necessarily discharge the other. Our salvage guide explains why the same casualty can generate both requests.
Worked example: sharing an agreed £600,000 allowance
The vessel, cargo interests and figures in this example are invented. Assume the applicable adjustment has already established £600,000 of allowable extraordinary expenditure, initially paid by the shipowner. The freight-at-risk interest belongs to a separate party, not the shipowner. There are no sacrificed-property allowances in this first calculation. Assume the following are the final adjusted contributory values, not simply policy sums insured.
| Contributing interest | Assumed contributory value | Share of £20 million | Contribution |
|---|---|---|---|
| Ship | £12,000,000 | 60% | £360,000 |
| Cargo group A | £5,000,000 | 25% | £150,000 |
| Cargo group B | £2,000,000 | 10% | £60,000 |
| Freight at risk | £1,000,000 | 5% | £30,000 |
| Total | £20,000,000 | 100% | £600,000 |
The illustrative contribution rate is £600,000 ÷ £20,000,000 = 3%. Group B therefore contributes 3% × £2,000,000 = £60,000, even if every item in that group arrived undamaged.
The shipowner does not recover the full £600,000 from cargo. On these assumptions, it bears its own £360,000 share and receives £240,000 from the other interests. The contributions add back to the assumed allowance without creating a second recovery.
A real adjustment can involve multiple allowances, deductions, interest, fees, different currencies and contested liability. Those issues are excluded here. The example teaches proportional allocation after the difficult allowance and valuation decisions have already been made; it does not establish a typical casualty rate.
Contributory value is not automatically the insured value
The denominator deserves as much attention as the expenditure. The applicable rules govern the relevant time and basis of valuation. For cargo, the discharge value and specified freight/insurance components matter; damage and other required adjustments must be considered. A declared insurance amount cannot simply be substituted because it is readily available.
Property sacrificed in GA also needs careful handling. Its allowance is brought into the contributory-value calculation where not already included. Otherwise the sacrificed interest could receive an allowance without sharing the burden on the prescribed basis.
As a second, separate arithmetic illustration, assume a cargo interest has an agreed £100,000 sacrifice allowance and a final adjusted contributory value of £1,000,000, already including the necessary allowance. If the completed adjustment produces a 4% contribution rate, its contribution is £40,000. Its net credit in that adjustment is then £100,000 − £40,000 = £60,000. This does not authorise a second £100,000 recovery for the same loss from another route.
Insurance and fault remain separate enquiries
Cargo insurance can respond to a qualifying GA contribution even without physical damage to the insured goods. As an identified wording example, clause 2 of the 2009 Institute Cargo Clauses (A) deals with GA and salvage charges, subject to its conditions and exclusions. The policy still needs to cover the relevant interest and adventure. See cargo insurance explained for the relationship between interest, journey and valuation.
Hull insurance commonly addresses the ship’s insured GA exposure under its own terms. P&I may address specified unrecoverable contributions in defined circumstances; it should not be assumed to pay every gap left by another arrangement.
Rule D preserves the distinction between adjustment and rights concerning fault. A contribution dispute may therefore require examination of the carrier’s contractual obligations, available defences and applicable law. “GA declared” does not settle those issues, and an insurance payment does not make them disappear.
Read the request as the start of a file, not a final bill
A well-organised response identifies the shipment, carriage terms, incorporated GA rules, adjuster and relevant insurer. It preserves the casualty notices and the documents needed to value the interest, and distinguishes requests for security from demands for final payment.
The questions then become concrete: what measures generated the claimed allowance, on which valuation basis is this interest included, what security is required, and what rights must be preserved? Those questions explain why an undamaged consignment can be involved while leaving room to examine whether a particular contribution is actually due.
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