Demurrage

What it does

Demurrage is the agreed sum a charterer pays the shipowner for keeping the vessel at the load or discharge port longer than the time allowed for cargo operations. Once the free time known as laytime has been used up, the ship is said to be on demurrage, and the charterer compensates the owner at the daily rate fixed in the charter party for every further day, or pro-rata part of a day, that the vessel is detained.

Because the figure is set in advance, demurrage is treated as liquidated damages rather than an open-ended claim. The owner does not have to prove the actual loss suffered from the delay; the agreed rate stands in for it. That certainty is the entire point: both sides know the price of slow cargo handling before the fixture is concluded, which makes the risk straightforward to quote, to budget for, and to insure against.

Commercial effect

Demurrage converts time into money at a known price, so it shapes how a charterer plans port calls and how an owner prices a voyage. A charterer facing congested berths or slow shore equipment can model the likely demurrage exposure and decide whether to accept the business, push for more laytime, or build the anticipated cost into the freight it charges its own buyers down the line.

For the owner, the demurrage rate is a proxy for the daily earning power of the ship. If it is set too low relative to the market, delay becomes cheap for the charterer and the owner ends up subsidising inefficiency ashore. If it is set high, the charterer carries a strong incentive to work cargo quickly. The rate is therefore as much a commercial lever as it is a damages figure, and it moves with the freight market.

Owner's perspective

The owner wants demurrage to start counting as early and as reliably as possible and to keep running once it begins. A clean notice of readiness, a wide definition of countable time, and few exceptions all protect the owner's position. The owner also wants the rate pitched near the vessel's daily hire equivalent so that a day lost in port is not, in effect, a day of earnings given away for nothing.

Owners are wary of demurrage time bars and documentation conditions, which can defeat an otherwise sound claim if the supporting papers are not submitted in the required form and within the required window. Keeping statements of facts, pumping logs, and notices in good order is, for the owner, every bit as important as the rate itself, because a claim that cannot be enforced is worth nothing however large the sum looks on paper.

Charterer's perspective

The charterer wants generous laytime, clearly defined exceptions, and a rate that reflects a realistic cost of delay rather than a punitive one. Every excepted period, every interruption for weather or for matters within the owner's control, and every documentation condition is an opportunity to reduce or resist the claim. The charterer's exposure is also frequently passed down the chain to shippers and receivers wherever the sale contract permits it.

A charterer trading the same cargo on back-to-back terms tries to align the demurrage it owes the owner with the demurrage it can recover from its own counterparties. Any mismatch in rates, in laytime, or in exceptions between the charter and the sale contract leaves the charterer carrying the gap. This is one of the most common and most avoidable sources of loss in cargo trading, and it rewards careful contract alignment before fixing.

Negotiation points

• The daily rate: benchmark it against the vessel's likely time charter equivalent so neither side gives away earning power nor overpays for delay.
• Laytime length and definition (weather working days, running days, reversible or not) — these shift exposure as much as the rate does.
• Documentation and time-bar conditions: the period allowed and the exact papers required to support a claim, balanced against what is realistically obtainable at each port.
• Excepted periods and interruptions — strikes, weather, shifting, awaiting free pratique — and which party bears each one.
• Whether laytime and demurrage are reversible across load and discharge, letting time saved at one end offset time lost at the other.

Common variations

• Reversible demurrage, where load and discharge time are pooled so saved time at one port offsets an overrun at the other.
• Fixed despatch payable at half the demurrage rate for laytime saved, a long-standing dry bulk convention.
• Detention rather than demurrage, where prolonged delay shifts the basis of the claim from the agreed rate to damages at large.
• Tiered or escalating rates that rise after a set number of days on demurrage to discourage extended detention of the ship.