Question 1

What is the difference between SOC and COC containers?

Accepted Answer

COC (Carrier-Owned Container) means the shipping line owns the box and includes it in the freight rate: you load it, ship it, and return it empty to the line's nominated depot within a free-time window. SOC (Shipper-Owned Container) means you own or one-way lease the box and buy only the slot on the vessel: the line moves your container but never owns it. The practical line between them is control and the clock. With COC, the carrier controls the equipment and starts a detention clock the moment the box leaves the terminal; with SOC, you control the equipment, set your own timeline, and answer for the container's condition and final disposal yourself. SOC is the standard structure for one-way moves, congested or remote destinations, and any lane where holding a carrier's box would trigger heavy detention.

Question 2

Who is liable for the container under SOC vs COC — repairs, loss, damage?

Accepted Answer

Under COC, the carrier owns the asset, so structural maintenance, periodic CSC re-certification, and end-of-life disposal are the line's problem — but you are liable for any damage caused during your custody and for detention if you hold the box too long. Under SOC, the container is your asset end to end: you certify it is cargo-worthy with a valid CSC plate before loading, you carry the risk of loss or damage in transit (usually covered by cargo or container insurance), and you are responsible for what happens to the box at destination — gate-in acceptance, repair, resale, or scrapping. The trade is straightforward: COC offloads asset risk to the carrier but keeps you on their detention clock; SOC puts asset risk on you but removes the carrier's clock entirely.

Question 3

How do demurrage and detention (D&D) charges differ between SOC and COC?

Accepted Answer

This is where the two structures diverge most. With COC, the carrier grants a limited window of free time (commonly a handful of days at origin and at destination) and then bills detention per container per day once you exceed it — charges that escalate in tiers and, on a congested port or a slow inland clearance, can quietly overtake the value of the cargo. With SOC, there is no carrier detention clock at all, because the box is yours: you are not borrowing the line's equipment, so holding it for weeks at a project site or waiting out customs costs you nothing in D&D. You still pay terminal storage if the box sits inside the port, but the open-ended per-day detention exposure disappears. For any destination with long dwell times, unpredictable clearance, or limited depot infrastructure, removing that clock is usually the single biggest reason to go SOC.

Question 4

When should I choose SOC over COC?

Accepted Answer

Choose SOC when the detention math or the destination works against a carrier's box. The clearest cases: (1) one-way and project moves, where the container stays at destination or is resold locally rather than returned; (2) congested or strike-prone ports where free time evaporates and detention escalates fast; (3) remote or under-served destinations where the carrier has no convenient empty-return depot, so a COC box would rack up detention while you hunt for somewhere to hand it back; (4) cargo with slow or uncertain customs clearance, where you cannot predict how long the box will be tied up. Choose COC when the move is a simple round-trip on a well-served lane, dwell time is short and predictable, and you would rather the carrier carry the equipment risk. The decision is rarely about the box itself — it is about how long you will hold it and how painful the return logistics are.

Question 5

What are the hidden costs or pitfalls of going SOC?

Accepted Answer

SOC removes the carrier's clock but hands you the equipment responsibilities, and three of them catch first-time SOC shippers. (1) Destination disposal: once the cargo is unstuffed, the box is still yours — you need a buyer, a depot, or an onward move, and an unplanned empty sitting at destination is a cost, not an asset. (2) Gate-in and condition acceptance: terminals and depots can refuse a container that fails inspection, so the CSC plate must be valid and the box genuinely cargo-worthy before it ships, not after. (3) Per-line SOC acceptance: not every carrier accepts SOC on every service, and some apply SOC surcharges or require pre-approval of the container, so the slot booking has to be confirmed as SOC-eligible up front. Budget for insurance on a box you now own, confirm the destination has somewhere to receive it, and verify SOC acceptance with the line before you commit the cargo.

SOC vs COC Leasing – MG-Atlantic

SOC — Shipper Owned Container

COC — Carrier Owned Container

Key Differences