Demurrage and Detention Charges: What They Are and How to Avoid Them

Demurrage and detention are two of the most misunderstood charges in sea freight — often used interchangeably by importers even though they are billed by different parties, for different reasons, at different points in the cargo’s journey. Both are, at their core, penalty charges for holding a shipping line’s equipment or space longer than the free period allowed, and both are almost entirely avoidable with basic planning. They are also two of the most common ways a straightforward import ends up costing significantly more than quoted.

Demurrage: the charge for cargo sitting at port

Demurrage is charged by the shipping line or the port terminal for a container that remains within the port or terminal yard beyond its allotted “free time” — the number of days after a vessel’s arrival during which storage is included in the freight cost. At Chattogram, free time is commonly measured in a handful of days after discharge, though the exact number depends on the shipping line and the specific service contract. Once free time expires, demurrage accrues daily, and the daily rate typically increases the longer the container sits uncollected, precisely to discourage using the terminal as free long-term storage. The trigger for demurrage is almost always the same root cause: the container cannot be cleared through customs and physically collected before free time runs out.

Detention: the charge for holding the shipping line's container itself

Detention is a related but distinct charge, billed for keeping the shipping line’s physical container (not the port space, but the actual steel box) outside the terminal — typically after it has been collected and moved to your warehouse for unloading — beyond the free time allowed for its return. If your cargo has been collected and is now sitting in your yard while you slowly unload it over several days, and the empty container has not yet been returned to a designated depot, detention charges can accrue even though the box is no longer inside the port. Importers who only think about the port-side timeline sometimes get caught by this second, separate clock.

What actually causes these charges in Bangladesh imports

The overwhelming majority of demurrage cases we see trace back to documentation delays rather than genuine customs disputes about the goods themselves: a bill of lading not released by the shipping line because final payment has not cleared, an import document missing a required signature or stamp, or a C&F agent who was engaged too late to have documents ready before the vessel actually arrived. Our customs clearance timeline guide and port congestion guide both cover related delay sources. A smaller but real share of cases stem from genuine customs queries — a mismatch between declared and assessed value, or a shipment selected for physical examination that takes longer to process — where the delay is outside the importer’s direct control but the resulting charge still lands on them.

Who is actually liable for these charges

This is a point of frequent confusion: demurrage and detention are typically billed to whoever is named as the consignee on the bill of lading, which is usually the importer, not the freight forwarder or C&F agent, regardless of whose delay actually caused the charge. If a C&F agent’s slow paperwork causes the delay, the importer often still receives the bill first and has to separately pursue reimbursement from the agent based on their service agreement. This is why the contract or service terms with your C&F agent or logistics partner should explicitly address who bears responsibility for demurrage caused by their own processing delays, rather than leaving it unstated and assuming it will be sorted out amicably after the fact.

How to actually avoid these charges

• Engage your C&F agent and prepare clearance documents before the vessel arrives, not after — documents should be ready to file the moment the ship berths
• Track the vessel’s estimated arrival closely in the final week before docking, since schedules can move earlier as well as later
• Ensure supplier payment and any bank-side document release happen with enough buffer that the bill of lading is available in hand before free time starts counting down
• Arrange transport (trucks) to collect the container promptly once cleared, rather than treating collection as a lower priority once clearance is done
• Return empty containers to the designated depot promptly after unloading to stop the detention clock
• Put explicit demurrage liability terms in writing with your C&F agent or logistics partner before the shipment, not after a charge appears

What to do if charges have already started accruing

If a delay is unavoidable — a genuine customs query, a missing certificate that takes time to obtain — the priority becomes minimizing further accrual rather than avoiding what has already accumulated. This means resolving the underlying issue (the missing document, the disputed valuation) as the single fastest way to stop the clock, rather than waiting passively. Shipping lines and terminals occasionally grant a limited extension or partial waiver for documented, unavoidable delays such as a natural disaster or a systemic customs system outage, but this is discretionary and should be requested formally and promptly, not assumed.

How DE International prevents these charges for clients

We track vessel schedules and prepare clearance documentation ahead of arrival specifically to avoid demurrage and detention, and our service terms are explicit about liability so clients are not left guessing who absorbs a charge if something does go wrong on our end. If you have experienced unexpected demurrage or detention charges and want a clearance process built to avoid them going forward, reach out through our contact page or see our sourcing and logistics service. Browse our full services and shop as well.

How free time and daily rates typically escalate

Free time terms are not identical across shipping lines or even across different service contracts with the same line, which is why the specific free time for your booking should be confirmed at the time of booking rather than assumed from a previous shipment. Daily demurrage rates commonly step up in tiers — a lower rate for the first several days past free time, then a meaningfully higher rate for each day beyond that — structured deliberately to make short delays tolerable but long ones expensive, which means a delay that starts small can compound quickly if the underlying clearance issue is not resolved promptly. Detention charges often follow a similar tiered structure for the time the physical container spends outside the terminal.

Demurrage on export shipments, not just imports

While this guide focuses on import shipments arriving at Chattogram, the same demurrage and detention mechanics apply in reverse to Bangladeshi exporters sending cargo to China or elsewhere — a container sitting at the export terminal waiting on a delayed customs export permission, or an empty container held too long before being stuffed with export cargo, accrues charges under the same logic. Exporters coordinating with Chinese buyers on delivery schedules should apply the same document-readiness discipline covered above to avoid the same category of charge on the outbound side.

A final planning note

Building a standard pre-arrival checklist — documents ready, transport booked, empty-container return arranged — into your standard operating process for every shipment, rather than treating each one as a one-off, is what actually prevents these charges from becoming a recurring cost of doing business.