What is Demurrage?

Imagine you've chartered a vessel to ship 20,000 tons of copper concentrate. The vessel arrives on schedule but loading can't commence because material is not ready, so loading is delayed by three days. The vessel can't leave, the owner can't earn money elsewhere, and every extra day costs thousands of dollars. This cost is known as demurrage.

For bulk vessels, demurrage can apply at the port of loading or discharge. It will be incurred if cargo loading is delayed, or takes longer than planned, keeping the vessel in port beyond the agreed laytime. Laytime is the agreed number of days allowed for loading or discharge. This is the same at the port of discharge if the vessel cannot depart within the agreed laytime.

The charterer normally pays demurrage to the shipowner, though who ultimately bears that cost depends on the underlying commercial contract and the reason for the delay. Specific demurrage rates will be predetermined at the time of booking the vessel.

In container shipping, demurrage applies while containers are inside the port after they have been offloaded from the vessel. If containers sit too long inside the port before being picked up, demurrage will be applicable. The number of free days is negotiated as part of the initial freight booking. Demurrage will be applied if the containers remain at discharge port beyond these free days. These costs can add up quickly and are part of the reason accurate and efficient bill of lading and document control is crucial.

It is also worth mentioning dispatch. Dispatch is effectively a rebate paid by the vessel owner to the charterer for using less laytime than allowed - essentially the opposite of demurrage. It encourages efficient terminal operations and incentivizes charterers to complete loading or discharge early.

The less time a vessel spends in a port, the more voyages it can make. Where demurrage is a penalty, dispatch is a reward - though dispatch is usually paid at a lower rate than demurrage is charged, often 50%.

However, not all vessels offer dispatch. Many tanker (wet-bulk) contracts prioritize safety over speed. Maximum pumping rates may be set to avoid static electricity buildup. There are also mandatory line checks and strict sampling requirements. Tanker owners argue that quick turnaround should not be financially incentivized (though I'm sure some energy traders disagree!)

In tight freight markets, some dry-bulk vessel owners may refuse to offer dispatch, or the rates may be heavily reduced, because charterers have far fewer vessel options.

A vessel costing $50,000 per day in demurrage can quickly turn an otherwise profitable trade into a loss. For physical traders, managing logistics is just as important as managing price risk.