I want to learn about the deumurage and detention process . current D&D/OSRA Environments and rules

I would love to help you master the ins and outs of demurrage, detention, and how the Ocean Shipping Reform Act of 2022 (OSRA) completely changed the playing field. To make sure we focus on what matters most to you, let's start with a quick question.

To help me tailor this session, what is your current role in the shipping process (e.g., freight forwarder, importer/exporter, logistics coordinator), and are you currently dealing with specific D&D billing issues?

Logistics Coordinator (seeking general operational knowledge)

Welcome! Since you are managing day-to-day logistics, mastering how these charges work is your first line of defense against costly billing errors. Let's start with the absolute basics: where the container actually is.

Inside the Port vs. Outside the Port

To keep cargo moving, carriers and terminals use two distinct fees to discourage people from using equipment as storage. The entire difference boils down to a physical boundary: the port gates.

: This charge accumulates when a loaded container sits inside the port terminal boundary past its allotted free days. It is a storage fee for holding up terminal space.
: This charge accumulates when the container is outside the port gates (e.g., at your importer's warehouse) past the allowed free time, and has not yet been returned empty. It is an equipment usage fee for keeping the carrier's container out of circulation.

A clean 2D comparison showing a container with a clock inside the port labeled Demurrage, and an identical container with a clock outside the port labeled Detention.

This visual illustrates how the physical location of the equipment determines which clock is ticking. In everyday logistics, confusing these two terms is incredibly common, but knowing the difference is essential because the billing rules and your strategies for disputing them under OSRA 2022 are completely different for each.

How do 'free days' work for both?

Free days are essentially your grace period—the pre-negotiated window of time where you can use the equipment or terminal space without paying a cent of demurrage or detention. Once those free days expire, the carrier's financial penalty clock starts ticking.

How Free Days Are Allocated

The number of free days you get is not one-size-fits-all. It is primarily determined by your contract with the ocean carrier or the terminal's standard rates. For standard dry containers, a typical allocation might be 4 to 7 free days for demurrage (inside the port) and another 3 to 5 free days for detention (outside the port). Special equipment, like refrigerated containers (reefers), usually gets far fewer free days—sometimes only 2 or 3—because they require active electrical hookups at the terminal to keep cargo from spoiling.

As a coordinator, you will also occasionally run into combined free time (sometimes called combined D&D). Instead of giving you separate buckets—like 5 days inside the port and 5 days outside—the carrier gives you a single pool of, say, 10 combined free days. This gives you the operational flexibility to decide how to use those days. If customs delays hold up your container at the dock for 7 days, you still have 3 days left to get it to the warehouse and back before any fees kick in.

Are free days different for exports vs imports?

Yes, they absolutely are, and as a coordinator, this is where things get operationally tricky.

The Export Game: Different Rules, Different Triggers

While import free time is all about how fast you can pick up a full container and return it empty, exports run the entire process in reverse. For exports, the demurrage and detention triggers shift completely to coordinate with the vessel's arrival rather than its departure.

Export : The clock starts the moment you pull an empty container from the carrier's depot. You are given a set number of free days to get that empty container to your shipper's facility, load it, and return it full to the port.
Export : Once the loaded container is gated back into the terminal, it sits in stack waiting for its ship. Demurrage free time governs how long it can wait on the dock before loading.

To manage export demurrage, coordinators have to watch a critical date called the [{} (ERD). Gating a loaded container in even one day before the ERD is an automatic trigger for export demurrage, as terminals will not allow you to store containers indefinitely for free.

What happens if the vessel schedule slips after I gate in?

It is an incredibly stressful situation when a vessel slips, but the short answer is: you should not have to pay for a delay you did not cause.

The Incentive Principle

Historically, ocean carriers would often bill shippers demurrage anyway when a vessel schedule slipped, arguing that the container was physically occupying space on the dock past its free days. Shippers were left holding the bag for weather delays, blank sailings, or mechanical breakdowns. However, the Federal Maritime Commission (FMC) established a core guideline known as the . Under this rule, demurrage and detention charges are only considered "just and reasonable" if they serve as a practical incentive to keep cargo moving. If the terminal gates are closed, or if the vessel is delayed and cannot physically receive your container, a storage fee cannot act as an incentive. It is simply an unfair penalty.

The passing of the Ocean Shipping Reform Act of 2022 (OSRA 2022) took this principle and gave it real teeth. Under OSRA 2022, carriers are explicitly prohibited from charging demurrage and detention for situations entirely beyond the shipper's control. If you gated in your container on time according to the original schedule, and the carrier subsequently pushes the vessel departure back, you are generally entitled to dispute and cancel any demurrage fees that accumulate during that forced waiting window.