1 Overview
Demurrage and detention are two separate charges that arise when a shipping container stays in the wrong place for too long. Demurrage applies while the container is still inside the terminal or port area, typically after discharge from the vessel and before it leaves the gate. Detention applies after the container leaves the terminal, usually when the consignee keeps the box beyond the free time allowed for unpacking and returning it empty. Both charges are contractual, not customs duties, and they are billed by the party that controls the equipment, often the ocean carrier or the terminal. The free time is a grace period negotiated in the transport contract or tariff. Once that period ends, charges begin to accrue, often on a escalating scale. The exact triggers, rates, and free days vary by port, carrier, and service contract, so the bill of lading and the carrier's tariff are the controlling documents. For importers and exporters, these charges are a direct cost of poor timing or incomplete paperwork. They are not covered by cargo insurance, and they do not replace customs duties or freight charges. Understanding who is responsible at each stage is essential, because the party that holds the container when free time expires is usually the party that pays.
2 Where the risk and the cost actually land
The allocation of demurrage and detention risk depends on the sale contract and the Incoterm, but the operational reality is often simpler: the party that can physically move the container is the party that pays. Under Free on Board (FOB), the buyer arranges ocean freight and becomes the consignee on the bill of lading. The buyer, or its customs broker, typically bears demurrage if the container is not cleared and picked up within free time. Under Cost and Freight (CFR) or Cost, Insurance and Freight (CIF), the seller arranges and pays the main freight to the destination port, but the buyer still takes delivery and is usually named as consignee. In that case, demurrage at destination generally falls on the buyer, while detention after pickup also falls on the buyer. Under Delivered Duty Paid (DDP), the seller remains responsible until the goods are delivered to the named place, so demurrage and detention can land on the seller if the buyer is slow to accept or unload. The key point is that risk transfer for the goods does not automatically transfer the risk of these charges. The bill of lading, the delivery order, and the terminal's free-time rules determine who must act and who must pay. If the consignee cannot clear customs or arrange trucking, the meter runs against the party named on the transport document.
3 How the mechanics work end to end
The clock starts when the container is discharged from the vessel and made available for pickup. The terminal grants a set number of free days for demurrage, during which the consignee can clear customs, pay duties, and arrange inland transport. If the container is not picked up by the end of that period, demurrage begins. Once the container leaves the terminal, a separate free period for detention starts. That period covers the time needed to deliver the container to the consignee's facility, unload it, and return it empty to the carrier's designated depot. If the empty container is not returned within the detention free time, detention charges accrue. Both charges are typically calculated per container, per day, and often increase after the first few days. The carrier or terminal issues invoices, usually to the party named on the bill of lading or to the customs broker who requested the delivery order. Payment is often required before the container is released or before the next shipment is accepted. Disputes can arise over whether the free time was correctly calculated, whether the terminal was actually ready to receive the container, or whether the consignee was prevented from acting by customs delays. In practice, the party that controls the container when the free time expires is the party that must pay, even if the underlying cause was a delay by another party.
4 A worked example from door to destination
Imagine a buyer in a landlocked country purchases machinery from a seller overseas under CIF terms. The seller arranges ocean freight to a seaport and pays the main freight and insurance. The buyer is named as consignee on the bill of lading. The container arrives and is discharged on a Monday. The terminal grants five free days for demurrage. The buyer's customs broker files the entry, but customs requests additional documentation, delaying clearance until the following Monday. That is seven days after discharge, so two days of demurrage accrue. The buyer pays demurrage to the terminal or carrier before the container is released. The container is then picked up by a trucker and delivered to the buyer's warehouse on Tuesday. The carrier allows three free days for detention, meaning the empty container must be returned by Friday. The buyer's warehouse is short-staffed, and unloading takes longer than expected. The empty container is not returned until the following Monday, so three days of detention accrue. The buyer pays detention to the carrier. In this example, the buyer bore both demurrage and detention because the buyer controlled the container after discharge and was named as consignee. The seller's CIF obligation ended when the container was discharged at the port, so the seller did not pay these charges. If the terms had been DDP, the seller might have remained responsible for delivery and thus for the charges.
5 Mistakes that cost money at the border
One common mistake is assuming that free time starts when the vessel arrives, rather than when the container is discharged and available. Another is failing to confirm the exact free days in the carrier's tariff or service contract, because free time can vary by port, by carrier, and by commodity. A third mistake is not coordinating customs clearance and trucking in advance. If the customs broker is not ready or the trucker is not booked, the container sits in the terminal and demurrage begins. On the detention side, a frequent error is underestimating the time needed to unload and return the empty container. Warehouses may be busy, or the return depot may have limited hours. Another mistake is returning the container to the wrong depot or without the required equipment interchange receipt, which can delay the return and extend detention. Finally, some parties ignore the fact that demurrage and detention are separate charges with separate clocks and separate free periods. Paying demurrage does not stop detention from accruing once the container leaves the terminal. The best prevention is to treat free time as a deadline, not a suggestion, and to build a buffer into the schedule for customs and transport delays.
6 Documents worth keeping
The bill of lading or sea waybill is the primary transport document and identifies the consignee, the port of discharge, and the terms of carriage. It often references the carrier's tariff, which contains the free-time rules and charge rates. The delivery order is issued by the carrier or its agent to authorize release of the container to the consignee or its trucker. The equipment interchange receipt records the condition of the container when it is picked up and when it is returned, and it can be used to dispute charges if the container was not available or was already damaged. Terminal or depot invoices show the actual demurrage and detention charges, including the dates and container numbers. The sales contract and the Incoterm rule determine which party is responsible for these charges, so keeping a copy of the contract and the applicable Incoterms 2020 rule is essential. Customs entry documents and proof of duty payment can help show that the consignee acted promptly and that delays were outside its control. Finally, any correspondence with the carrier, terminal, or customs broker about free time, extensions, or disputes should be retained. These records are the basis for challenging incorrect charges or for recovering costs from a counterparty if the contract allows.
7 Frequently asked questions
What is the difference between demurrage and detention? Demurrage applies while the container is inside the terminal, before pickup. Detention applies after the container leaves the terminal, until the empty container is returned. They are separate charges with separate free periods. Who pays demurrage and detention? The party that controls the container when the free time expires usually pays. In most import transactions, that is the consignee or its customs broker. Under DDP, the seller may remain responsible. Does cargo insurance cover demurrage and detention? No. Cargo insurance covers physical loss or damage to goods, not contractual charges for late container return. Can demurrage and detention be waived? Sometimes, if the delay was caused by the carrier, the terminal, or a customs hold outside the consignee's control. Waivers are not automatic and must be requested with supporting documents. How can I avoid these charges? Confirm free time in advance, prepare customs documents early, book trucking before discharge, and return empty containers promptly. What documents do I need to dispute charges? Keep the bill of lading, delivery order, equipment interchange receipt, terminal invoices, and any correspondence showing the cause of delay. Does the Incoterm determine who pays? The Incoterm allocates costs between buyer and seller, but the carrier bills the party named on the transport document. The Incoterm helps determine who ultimately bears the cost, but the operational responsibility follows the container.