Marine cargo insurance: covering an import without getting trapped

The container that goes overboard gives no warning

A Texas importer gets the call: the container ship carrying his furniture order from Ningbo lost around fifty boxes in the South China Sea during a storm. His goods — $42,000 of sofas — are on the seabed. The forwarder's first question: "Did you have cargo insurance?" Answer: "The supplier told me it was insured." Wrong answer.

Cargo insurance (or ad valorem cover) is the most misunderstood line item in the import chain. Many confuse it with carrier liability, which is in fact capped at derisory amounts. This guide explains the real coverage tiers, the correct value to insure, the General Average trap, and how to avoid discovering the gap on the day of the loss.

Why carrier liability is never enough

First common mistake: assuming that "if the carrier loses my goods, they pay me back." False in 95% of cases. In ocean transport, the Hague-Visby Rules cap the carrier's liability at 666.67 SDR per package or 2 SDR per kg, whichever is higher (1 SDR ≈ $1.35 in 2026). In air freight, the Montreal Convention limits it to 22 SDR per kg.

In practice: a full container of goods worth $42,000 lost overboard gives, under carrier liability, roughly 2 SDR × the cargo weight × $1.35 — but only if you can prove the carrier's fault, which is slow and uncertain. For a 11 lb (5 kg) air parcel holding $3,000 of electronics, the Montreal cap is about 22 × 5 × $1.35 ≈ $148. Cargo insurance, by contrast, indemnifies you at the real value, with no need to prove fault.

The three coverage tiers: ICC A, B and C

The global cargo insurance market is built on the Institute Cargo Clauses (Lloyd's Market Association / IUA, 1/1/2009 version). Three standard clauses, from broadest to narrowest:

The vast majority of importers buy ICC (A): for a few tenths of a percent of extra premium it covers theft and partial breakage, which are by far the most frequent losses. ICC (C) only makes sense for low-sensitivity bulk goods (ore, scrap). War and strikes risks always require a separate endorsement (War & Strikes clauses), essential on routes through sensitive zones such as the Red Sea.

The right value to insure: CIF + 10%

You do not insure the invoice value alone. The market rule is the CIF value plus 10%:

Insured value = (goods + freight + insurance) × 110%

The extra 10% — the "imaginary profit" — covers lost trading margin, duties and tax already committed, and claims-handling costs in a total loss. Insuring below exposes you to the average clause: if you insure $30,000 of goods actually worth $40,000, a $10,000 partial loss is paid only at 30,000/40,000 = 75%, i.e. just $7,500.

Three worked examples

Example 1: premium calculation (apparel India → UK)

For $110, the entire shipment is covered door to door. Cargo premium rates typically sit between 0.1% and 0.5% of the insured value depending on the commodity, route and loss history — fragile electronics or high-theft lanes push it up, stable bulk pushes it down.

Example 2: General Average (machinery China → US)

Your goods are intact, but you cannot collect the container until you sign a general average bond and post a guarantee. The insurer posts it within hours; without a policy, the importer ties up cash for weeks.

Example 3: the ICC (C) gap (homeware Vietnam → US)

This is the textbook loss that wipes out premium savings: a CIF supplier bought the minimum ICC (C), seawater entered the hold, and the importer discovers that the "insured goods" did not cover the one risk that actually materialized.

What cargo insurance does not cover (even ICC A)

ICC (A) "all risks" is poorly named: it carries standard exclusions you must know to avoid a refused claim. The main ones:

• Inherent vice or the nature of the goods: natural rust, drying out, fermentation, ordinary loss of weight. The insurer does not cover what the cargo does to itself.
• Insufficient or unsuitable packing: this is the number-one cause of refusal. Missing dunnage, a poorly secured container, or a carton too light for the ocean route excludes the loss.
• Delay in delivery and consequential loss of market, even when the delay flows from an insured peril.
• Wilful misconduct of the insured and financial insolvency of the carrier.

On the buying side, two structures coexist. A single-shipment (voyage) policy covers one consignment — handy for a one-off import. An open cover is an annual contract under which you declare each shipment: a lower negotiated rate, automatic cover from the factory gate, and no forgotten shipments. Above roughly ten shipments a year, open cover is almost always the right call.

Insurance is not optional — it is a cost line

For 0.1 to 0.5% of the insured value, you turn a catastrophic risk into a predictable charge. The three reflexes of a sound importer: buy ICC (A) unless the cargo is insensitive bulk, insure CIF + 10% in your own name, and always demand the insurance certificate rather than trusting a verbal "it's insured".

To go further, check who bears the risk under your chosen Incoterm, secure payment with a letter of credit, and learn to read the ocean bill of lading, the key document for any claim after a loss.