Share this
by Hal Koss on 17 June, 2025
Key Takeaways
- Detention is charged when trucks or containers are held past free time.
- Demurrage applies when a container sits at the port past its free time.
- Truck detention typically runs $50 to $100 an hour after two hours.
- Dock scheduling cuts the wait times and gaps that trigger both fees.
Demurrage vs. detention is one of the most common points of confusion in logistics, and both charges add up fast. Each is a penalty for holding equipment beyond an agreed free period: demurrage while a container sits at the port, and detention once a truck or container is held at your facility.
Dock scheduling software is one of the most effective ways to cut the delays that trigger both fees. The stakes are real: the Federal Maritime Commission found that total detention and demurrage billed by nine major ocean carriers rose roughly nine-fold between mid-2020 and early 2022, before falling back from that peak.
What's the Difference Between Demurrage and Detention?
The difference comes down to where the equipment is sitting: demurrage accrues while a container is still at the port or terminal, while detention accrues once a truck or container is held at your facility. Truck detention is billed by the hour once free time runs out, while demurrage and container detention are billed per container per day.
What Are Detention Fees?
In trucking, a detention fee is what a carrier charges when its truck and driver are held at a shipper or receiver beyond the agreed free time, which is most often two hours. Truck detention is billed by the hour, and some contracts use tiered rates that rise the longer the truck waits. The same applies to trailer detention when a carrier's trailer is held at a facility.
In ocean shipping, detention also refers to a carrier's container being kept outside the terminal past its free time, for example while it waits to be unloaded at a warehouse before the empty is returned. Container detention is billed per day.
What Are Demurrage Charges?
Demurrage charges are penalties for leaving a container at the port or terminal beyond the agreed free time. They apply before the container is picked up for delivery. Demurrage fees are billed per container per day, and rates often increase the longer the container stays.
Key Differences: Detention vs. Demurrage
Detention and demurrage are closely related, but each applies in a different situation depending on where the equipment is. Both are tied to a pre-agreed free period during which a container or trailer can be held without penalty.
- Demurrage applies while the container is still at the port or terminal. If the cargo isn't picked up before free time expires, charges begin to accrue.
- Detention applies once the equipment is at your facility, whether that's a truck waiting at your dock or a container that hasn't been returned. Unloading may be taking too long or may not have started at all.
Think of it this way: demurrage is like paying for overstaying in a parking garage, while detention is like getting fined for returning a rented trailer late.
Demurrage charges and detention fees are not mutually exclusive. Without proper dock management, you risk incurring both at different stages of the clearing and offloading process.
What Is the Financial Impact of Detention and Demurrage?
Detention and demurrage cost far more than the line items on an invoice, because the delays behind them also disrupt operations and strain partner relationships.
Financial Consequences
The most obvious impact is the direct cost. Truckload detention fees typically range from $50 to $100 per hour once a truck has waited more than two hours. Demurrage and container detention are charged per container per day, so a few days of delay across several containers can quickly reach thousands of dollars.
The Opendock ROI calculator can help estimate what detention is costing your own facility.
Operational Disruptions
Delays almost always go hand in hand with demurrage and detention. Containers that sit longer than expected at the terminal or the warehouse hold up other shipments. For demurrage, that means less space for new cargo at the port. For detention, it means carriers can't send drivers to their next appointments, and warehouses end up with backups in their yards.
Long-Term Effects on Business Relationships
Demurrage charges and detention fees are designed as financial deterrents to keep shipping assets like containers, trucks, and terminal space productive. When one party consistently incurs these charges, it can strain the working relationship. Carriers may become hesitant to work with facilities that frequently hold their trucks, since idle equipment complicates their own operations and cash flow.
How Does Dock Scheduling Reduce Detention and Demurrage Fees?
Dock scheduling reduces both fees by making sure every truck and container arrives to an open dock, a ready crew, and a confirmed time slot. Opendock's online scheduling portal helps prevent the delays behind these charges in several ways.
Reducing Detention Fees
- Carrier-Led Scheduling: Carriers book their own dock appointments online, which removes confusion and helps them arrive when they're expected, reducing idle time spent waiting for a dock to open up.
- Structured Appointment Windows: Facilities can move away from inefficient first-come, first-served systems. Scheduled time slots reduce dock congestion, improve truck turnaround times, and lower the risk of detention.
- Labor Alignment: Knowing exactly when trucks are arriving lets warehouse managers allocate staff and equipment more effectively, so loading and unloading start on time.
Reducing Demurrage and Container Detention
- Advance Visibility into Dock Capacity: When drayage carriers can see and book open appointment windows, containers can be pulled from the terminal as soon as the warehouse is ready to receive them, rather than sitting at the port while free time runs out.
- Faster Turnaround at the Dock: Appointments booked online instead of over email or phone keep containers moving, and faster unloading means empties can be returned before container detention starts.
For more ways to tighten the process, see these fixes for dock appointment scheduling.
Results from Facilities Using Dock Scheduling
A beverage packer facing more than 700 detention claims a year used Opendock to replace phone and spreadsheet scheduling. It eliminated 72% of its detention, saving $36,000 annually, cut roughly 600 labor hours a year, and reached 90% carrier self-scheduling.
A chemical and gas 3PL tackled overbooked appointments, standby trucks, and rising detention costs by switching to Opendock. The company saved $144,000 annually in detention charges, cut scheduling labor by 12,000 hours a year across its facilities, and reached 70% carrier self-scheduling.
Ralph Moyle Inc. replaced manual scheduling for 37 dock doors with Opendock and cut the labor allocated to dock scheduling by more than 30%. Its team now uses Opendock's data on carrier punctuality and detention windows to back smarter conversations with customers.
Detention fees and demurrage charges are large cost centers for many supply chains. With dock scheduling in place, facilities can close the coordination gaps that let these fees accumulate.
Frequently Asked Questions
What Is the Difference Between Detention Fees and Demurrage Charges?
Demurrage applies while a container sits at the port or terminal past its free time, while detention applies when a truck or container is held at a shipper's or receiver's facility past its free time. Truck detention is billed by the hour, while demurrage and container detention are billed per day.
How Much Do Detention and Demurrage Fees Cost?
Truckload detention typically runs $50 to $100 per hour once a truck has waited past its free time, which is usually two hours. Demurrage and container detention are billed per container per day, so a few days of delay across several containers adds up quickly.
How Does Dock Appointment Scheduling Reduce Detention and Demurrage Costs?
Dock appointment scheduling reduces both costs by giving carriers self-scheduling access, creating structured appointment windows, and giving warehouse teams advance visibility into dock capacity. Trucks spend less time waiting, and containers can move from the port to the dock and back before free time runs out.