What is the main difference between demurrage and detention?

Demurrage occurs when a container stays inside the terminal beyond free time, while detention occurs when a container is not returned after being taken out. The location and timing are fundamentally different.

Can both charges be applied at the same time?

Yes. If pickup from the terminal is delayed, demurrage applies first. If the empty container is also returned late after pickup, detention will be charged as well. Each is calculated separately based on its own free time.

What do importers most commonly overlook?

Check free time conditions, Customs doumentation preparation, Alignment between pickup and unloading schedules, and Empty container return planning. In practice, customs delays often lead to demurrage, while unloading delays at warehouse lead to detention.

How can these charges be minimized?

Reducing customs delays, pre-aligning unloading and return schedules, and securing favorable free time terms with carriers are important. If you utilize Cello Square real-time tracking, you can check the vessel arrival schedule in advance and respond to them preemptively.

Does port congestion impact these charges?

Absolutely. Congestion delays both pickup and return, increasing the likelihood of both demurrage and detention. During peak seasons, additional buffer time should always be built into the schedule.

Logistics Terms What Are the Differences?
Demurrage vs Detention

Registration dateAPR 24, 2026

Key Takeaways

Demurrage is charged when a container stays inside the port terminal (CY) beyond the free time, while detention is charged when a container is not returned after being taken out of the terminal within the allowed free time.
Both charges, which are imposed by the ocean carrier to ensure the efficient turnover of container equipment are penalty fees.
Free time varies by carrier and contract terms, but is typically around 7 days. Charges can range from tens to hundreds of dollars per day once exceeded.
Recently, many global carriers apply a Combined Free Time policy, integrating demurrage and detention. This must be clearly confirmed at the contract stage.

Demurrage vs Detention at a Glance

Category	Demurrage	Detention
Location	Inside terminal (port/CY)	Outside terminal (warehouse, factory, etc.)
Trigger Point	Exceeding free time before pickup	Exceeding free time after pickup
Trigger Condition	Failure to pick up cargo on time at port	Failure to return empty container on time
Free Time	Typically 3–5 days (varies by carrier/route)	Typically 3–7 days (varies by carrier/route)
Main Causes	Customs delay, documentation issues, port congestion	Delayed unloading, warehouse delays, late empty return
Cost Responsibility	Usually consignee (importer)	Usually consignee (importer)
Management Focus	Customs clearance & pickup scheduling	Return scheduling after unloading

Cost Occurrence Timeline

Stage	Situation	Cost
Stage 1	Vessel arrival → Container discharged to CY	None
Stage 2	Free time at CY begins	None
Stage 3	Free time exceeded → Not picked up by shipper	Demurrage incurred
Stage 4	Container picked up (out-gated)	Demurrage ends
Stage 5	Unloading at consignee site → Free time begins	None
Stage 6	Free time exceeded → Empty container not returned	Detention incurred
Stage 7	Empty container returned to designated depot	Detention ends

In simple terms:
Demurrage applies when the container remains inside the port.
Detention applies when the container is outside the port but not returned on time.

With increasing volatility in global logistics, demurrage and detention are no longer seen as minor incidental charges unlike the past so the importance of managing them is increasing considerably. During periods of port congestion and equipment shortages, these costs surged significantly and became a major contributor to total logistics expenses.

Today, they are considered critical operational KPIs, directly affecting both transport efficiency and cost structure. While both charges stem from delays in container usage, they differ clearly in terms of where they are applied and the criteria.

Let's take a loook at these concepts and differences, and examine how they impact on logitics cost in real life.

DEM : Demurrage

Demurrage or demurrage charges, is a term used primarily in shipping and refers to the additional costs incurred when a carrier exceeds its "free time," the amount of time it has agreed to hold a logistics shipment in a container yard (CY) such as port or railroad depot. Demurrage is usually charged for exceeding a vessel's waiting time or cargo unpacking time. Demurrage is applied according to the contract between the carrier (shipping company) and the ship owner, and is designed to prevent containers from being held for long periods of time. It is charged per container per day as a compensation for the delayed time, and the rate may increase for longer stays. In addition, a storage fee at the CY terminal is also charged separately depending on the delayed schedule.

DET : Detention

Detention, unlike demurrage, is a cost incurred after the container has been released from the CY and refers to additional costs incurred when a container is not returned within a timeframe designated by the customer. Generally, when the recipient returns the container, if the container is not returned within the set period of free time, the detention cost is incurred. Detention is applied according to the contract with the container lessor or shipping company, and is a system introduced to ensure the quick return of used and empty containers. If the return is delayed, a certain amount of additional cost will be charged.

Demurrage and Detention during import / Export procedure

Since demurrage and detention occur during both the import and export procedures, it is important to have a proper understanding of which situations will incur additional costs based on your shipment's logistics activity.

During Import

Demurrage during the import process is charged when a container is received at CY after being unloaded from a vessel, but is not released after the free time, while detention is charged when a container released from CY to a shipper is not returned within the free time.

During Export

Detention during the export process is charged when a container leased to a shipper does not enter the CY after the free time has expired, while demurrage is charged when the container is not loaded onto a vessel within the free time after entering the CY.

Can Demurrage and Detention Occur at the Same Time?

Yes, they can. If a container is not picked up from the terminal within the free time, demurrage charges will apply first. After the container is picked up, if the empty container is not returned within the allowed free time, detention charges will be incurred as well.
These are not interchangeable charges. They apply to different stages of the logistics flow, and each is calculated based on its own free time.

How to Reduce Additional Charges: Key Action Points

Negotiate longer free time in advance when signing contracts with carriers
Prepare customs documentation (including HS codes) before vessel arrival to minimize terminal dwell time
Align pickup schedules with warehouse unloading capacity to complete operations within free time
Confirm empty container return locations and booking availability in advance
Review port congestion, carrier policies, and free time conditions during contract negotiation
Use real-time tracking to anticipate vessel arrival and act proactively

In short, controlling dwell time inside the terminal is the key for demmurage; whereas managing schedules of unloading and empty container return after pickup are crucial. Designing transport process by distingushign them accurately can reduce unnecessary cost.

Frequently Asked Questions

Q. What is the main difference between demurrage and detention?: A. Demurrage occurs when a container stays inside the terminal beyond free time, while detention occurs when a container is not returned after being taken out. The location and timing are fundamentally different.
Q. Can both charges be applied at the same time?: A. Yes. If pickup from the terminal is delayed, demurrage applies first. If the empty container is also returned late after pickup, detention will be charged as well. Each is calculated separately based on its own free time.
Q. What do importers most commonly overlook?: A.Check free time conditions, Customs doumentation preparation, Alignment between pickup and unloading schedules, and Empty container return planning.
In practice, customs delays often lead to demurrage, while unloading delays at warehouse lead to detention.
Q. How can these charges be minimized?: A. Reducing customs delays, pre-aligning unloading and return schedules, and securing favorable free time terms with carriers are important.
If you utilize Cello Square real-time tracking, you can check the vessel arrival schedule in advance and respond to them preemptively.
Q. Does port congestion impact these charges?: A. Absolutely. Congestion delays both pickup and return, increasing the likelihood of both demurrage and detention. During peak seasons, additional buffer time should always be built into the schedule.

Reduce Demurrage & Detention Costs Smarter with Cello Square

Even a single-day delay in customs clearance or container pickup can result in hundreds of thousands of won.

Cello Square, powered by Samsung SDS, is a digital logistics platform that supports customs and pickup to be compelted whithin the free time through real-time cargo tracking and ETA notification.

Real-time visibility: Track vessel location and ETA in real time to ensure timely customs preparation
Integrated customs services: Reduce CY dwell time by handling customs clearance within the platform
Global network across 36 countries: Manage container return schedules seamlessly at global hubs

Start managing your logistics smarter.
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👉 Learn how to stay within free time using Cello Square's visibility features.

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Logistics Terms What Are the Differences?Demurrage vs Detention