Demurrage Was Not in the Budget. It Rarely Is.
Quote from chief_editor on May 18, 2026, 3:30 pmDemurrage appears as a surprise cost in most physical commodity trades. The surprise is structural. The mechanism is predictable if you know where to look.
Commodity traders who work coal, grains, or metals regularly report that demurrage is the cost that most consistently catches buyers and sellers unprepared. It is not because demurrage is rare — it is because the way it is budgeted, when it is budgeted at all, systematically underestimates actual exposure.
The issue begins with how trades are priced. A buyer calculating the landed cost of a coal cargo will estimate freight, insurance, port dues, inspection costs, and working capital. Demurrage, if included at all, is typically included as an expected value — a low probability times a moderate cost. This produces a number like $5,000 to $10,000 as a demurrage provision on a trade where the actual demurrage exposure, given the port and the vessel size, could reach $80,000 or more.
The expected value approach makes statistical sense if you are running hundreds of similar trades and your probability estimates are calibrated. It makes much less sense for traders who are doing five to ten physical shipments per year on variable routes and vessel types, where each shipment is effectively an independent event with its own congestion profile, charterparty terms, and NOR timing complexity.
Congestion Is Seasonal, Structural, and Imperfectly Modeled
Port congestion in the major commodity export and import terminals follows predictable patterns that are well known to experienced shipping brokers but are rarely reflected in the demurrage provisions of commodity contracts. Richards Bay Coal Terminal in South Africa experiences predictable export bottlenecks during periods of high demand. Chinese iron ore import ports experience congestion during steel production peaks. Brazilian soybean export terminals, primarily at Santos and Paranaguá, experience chronic congestion during the harvest season — typically February through May — with vessel waiting times that can extend to 5 to 8 days during peak periods.
A buyer importing Brazilian soybeans during March and using a charterparty with a 3-day total laytime allowance, without a port congestion exception, is accepting demurrage exposure that is structurally embedded in the route during that season. This is not unpredictable — shipping brokers and port agents who work Santos year-round know the congestion profile well. The buyer who structures a charterparty without accounting for the seasonal congestion reality is not unlucky; they are uninformed.
Industry estimates suggest that on the Santos-to-Asia soybean route during peak season, vessels that do not have priority berthing arrangements wait an average of 3 to 6 days beyond their NOR acceptance before commencing loading. At typical Panamax demurrage rates of $10,000 to $14,000 per day, three extra days represents $30,000 to $42,000 in demurrage exposure — on a cargo where the margin to the buyer may be measured in dollars per tonne.
The Charterparty Terms That Determine Actual Exposure
The demurrage rate is the most visible term in a charterparty, but it is not the term that determines actual exposure. Actual exposure is determined by the laytime calculation: which hours count, which events stop or suspend laytime, how NOR is accepted, and what the port's handling rate actually is versus the rate assumed in the laytime calculation.
A charterparty that specifies "SHINC" (Sundays and Holidays Included) counts weekend and holiday time against laytime. One specifying "SHEX" (Sundays and Holidays Excluded) does not. On a cargo that loads over a weekend at a terminal where loading is continuous regardless of day, the difference between SHINC and SHEX can be two full days of laytime — a difference that determines whether the voyage ends in demurrage or dispatch.
Buyers who do not read charterparty terms carefully, or who delegate charterparty negotiation to freight brokers without specific guidance on laytime provisions, are accepting terms that may not match the operational reality of the terminal they are using. The mismatch surfaces as a demurrage invoice that is mathematically correct under the charterparty but represents a cost the buyer did not understand they were accepting when they signed.
Demurrage appears as a surprise cost in most physical commodity trades. The surprise is structural. The mechanism is predictable if you know where to look.
Commodity traders who work coal, grains, or metals regularly report that demurrage is the cost that most consistently catches buyers and sellers unprepared. It is not because demurrage is rare — it is because the way it is budgeted, when it is budgeted at all, systematically underestimates actual exposure.
The issue begins with how trades are priced. A buyer calculating the landed cost of a coal cargo will estimate freight, insurance, port dues, inspection costs, and working capital. Demurrage, if included at all, is typically included as an expected value — a low probability times a moderate cost. This produces a number like $5,000 to $10,000 as a demurrage provision on a trade where the actual demurrage exposure, given the port and the vessel size, could reach $80,000 or more.
The expected value approach makes statistical sense if you are running hundreds of similar trades and your probability estimates are calibrated. It makes much less sense for traders who are doing five to ten physical shipments per year on variable routes and vessel types, where each shipment is effectively an independent event with its own congestion profile, charterparty terms, and NOR timing complexity.
Congestion Is Seasonal, Structural, and Imperfectly Modeled
Port congestion in the major commodity export and import terminals follows predictable patterns that are well known to experienced shipping brokers but are rarely reflected in the demurrage provisions of commodity contracts. Richards Bay Coal Terminal in South Africa experiences predictable export bottlenecks during periods of high demand. Chinese iron ore import ports experience congestion during steel production peaks. Brazilian soybean export terminals, primarily at Santos and Paranaguá, experience chronic congestion during the harvest season — typically February through May — with vessel waiting times that can extend to 5 to 8 days during peak periods.
A buyer importing Brazilian soybeans during March and using a charterparty with a 3-day total laytime allowance, without a port congestion exception, is accepting demurrage exposure that is structurally embedded in the route during that season. This is not unpredictable — shipping brokers and port agents who work Santos year-round know the congestion profile well. The buyer who structures a charterparty without accounting for the seasonal congestion reality is not unlucky; they are uninformed.
Industry estimates suggest that on the Santos-to-Asia soybean route during peak season, vessels that do not have priority berthing arrangements wait an average of 3 to 6 days beyond their NOR acceptance before commencing loading. At typical Panamax demurrage rates of $10,000 to $14,000 per day, three extra days represents $30,000 to $42,000 in demurrage exposure — on a cargo where the margin to the buyer may be measured in dollars per tonne.
The Charterparty Terms That Determine Actual Exposure
The demurrage rate is the most visible term in a charterparty, but it is not the term that determines actual exposure. Actual exposure is determined by the laytime calculation: which hours count, which events stop or suspend laytime, how NOR is accepted, and what the port's handling rate actually is versus the rate assumed in the laytime calculation.
A charterparty that specifies "SHINC" (Sundays and Holidays Included) counts weekend and holiday time against laytime. One specifying "SHEX" (Sundays and Holidays Excluded) does not. On a cargo that loads over a weekend at a terminal where loading is continuous regardless of day, the difference between SHINC and SHEX can be two full days of laytime — a difference that determines whether the voyage ends in demurrage or dispatch.
Buyers who do not read charterparty terms carefully, or who delegate charterparty negotiation to freight brokers without specific guidance on laytime provisions, are accepting terms that may not match the operational reality of the terminal they are using. The mismatch surfaces as a demurrage invoice that is mathematically correct under the charterparty but represents a cost the buyer did not understand they were accepting when they signed.