Global supply chain logistics managers are frequently exposed to unexpected port financial fees that erode product margins. Two of the most common—and misunderstood—penalties are demurrage and detention charges.
The Port Boundary Definition of Demurrage
Demurrage is a financial penalty levied by ocean carriers when a full container sits inside the ocean terminal boundary beyond the contractually allowed ‘free time’ window. This delay is typically caused by customs clearance hold-ups, missing documentation, or terminal congestion.
Figure 3: High-volume container terminals enforce strict free-time limits for cargo storage.
The Inland Logistics Exposure of Detention
Conversely, **Detention** applies to the time *outside* the port gates. Once a container is picked up by a drayage trucker, the importer has a fixed timeframe to transport the cargo to their warehouse, unpack it, and return the empty container to the carrier’s designated depot. Negotiating extended combined free-time terms upfront is critical to mitigating these financial risks.
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