A container sitting at port costs money. A container sitting on a chassis at your warehouse costs money. These charges — demurrage and detention — are among the most misunderstood and most expensive line items in ocean freight. On some shipments, they exceed the freight cost itself.
Demurrage vs Detention: The Difference
Demurrage is charged when a container stays at the port terminal beyond its allotted free time after the vessel discharges it. The container is using terminal space, and the terminal charges for it. Detention is charged when a container stays outside the terminal — at your warehouse, on a chassis, at a CFS — beyond its allotted free time. The carrier owns the equipment and charges for its use.
Think of it this way: demurrage is rent for terminal space, and detention is rent for the carrier's container.
How Free Time Works
Every carrier provides a window of free time — typically three to seven days for demurrage and four to seven days for detention, depending on the carrier, the port, and your contract terms. During free time, no charges accrue. Once free time expires, daily charges begin and escalate on a tiered schedule.
A typical structure looks like this: free time of five days, then $150 per day for days six through ten, then $250 per day for days eleven through fifteen, then $350 per day beyond day fifteen. On a single container that sits 10 days past free time, the charges reach $750 to $1,500 — and that's on the conservative end.
Major carriers like Maersk, MSC, and CMA CGM publish their tariff schedules, but actual rates vary by port, equipment type (standard vs reefer), and contract terms. Reefer containers carry premium demurrage rates — often 30 to 50 percent higher — because the equipment is more expensive and in shorter supply.
Why Containers Sit
Containers don't sit idle because shippers enjoy paying penalties. The common causes are predictable and largely preventable.
Customs clearance delays are the most frequent cause. Missing or incorrect documentation — a wrong HS code, an incomplete commercial invoice, a missing phytosanitary certificate — can hold cargo in customs for days or weeks. Each day in customs is a day of demurrage ticking.
Port congestion affects entire terminals. When vessels queue at anchor because berth space is full, discharge schedules shift, and containers may sit longer before they can be collected. The shipper still pays demurrage even when the delay is the terminal's capacity problem.
Coordination failures between the shipper, forwarder, and trucking company cause containers to miss their pickup window. If your drayage truck arrives and the container isn't cleared yet, or if the container is ready but no truck is scheduled, the free time clock keeps running.
Insufficient preparation at destination is perhaps the most preventable cause. If you don't have a customs broker ready, a warehouse with receiving capacity, or a trucking company booked before the vessel arrives, you're guaranteed to lose free time.
The Financial Impact
On a $2,500 FCL shipment from Asia to the US East Coast, 10 days of combined demurrage and detention can add $1,500 to $3,000 — effectively doubling or tripling the total logistics cost. For shippers managing dozens of containers monthly, even a few days of average overstay across the fleet creates significant financial exposure.
The compound effect is worse than the per-day charges suggest. Late container returns cause chassis shortages, which delay your next shipments, which generate more demurrage on those containers. One bad week can cascade into a month of elevated costs.
How to Minimize Exposure
Start customs clearance before the vessel arrives. Pre-file entry documents, verify HS codes, and ensure all certificates are ready. The goal is customs release on the day of vessel discharge, not the day after.
Book drayage in advance. Coordinate with your trucking company based on the vessel's ETA, not the actual discharge date. If you wait for discharge confirmation to book a truck, you've already lost a day or two.
Use pre-arrival tracking alerts. Shipzy sends configurable notifications including a five-day pre-arrival alert, giving you a structured countdown to prepare customs documents, confirm warehouse readiness, and schedule trucking. Knowing exactly when your container will arrive — not approximately, but within a day — is the difference between preparation and reaction.
Establish relationships with destination forwarders before you need them. If you're shipping to a port where you don't have a trusted import-side agent, scrambling to find one after the vessel arrives guarantees delays. Shipzy's destination forwarder matching surfaces rated forwarders at your container's arrival port during tracking, letting you plan the import side before your cargo arrives.
Negotiate free time in your carrier contracts. If you consistently need more than the standard free time window, negotiate extended free days as part of your volume contract. Most carriers will extend free time for regular shippers — it's cheaper for them than processing demurrage disputes.
Frequently Asked Questions
How much does demurrage cost per day? Typically $100 to $350 per day for standard containers, escalating on a tiered schedule. Reefer containers cost 30 to 50 percent more. Rates vary by carrier, port, and contract terms.
Who pays demurrage — the shipper or the forwarder? The consignee (usually the shipper or buyer) pays demurrage. Your forwarder may advance the payment, but the cost is passed through. Some forwarders will negotiate free time on your behalf as part of their service.
Can demurrage charges be disputed? Yes, particularly when delays are caused by port congestion or carrier schedule changes beyond your control. Document everything — vessel arrival vs schedule, customs clearance timeline, truck appointments. Success rates vary, but well-documented disputes do get resolved.
How does Shipzy help reduce demurrage risk? Shipzy's tracking sends pre-arrival alerts so you can prepare customs clearance and drayage before the vessel arrives. Destination forwarder matching connects you with rated import-side agents at your arrival port — avoiding the scramble for a customs broker that causes most demurrage overruns.
Track your containers with pre-arrival alerts at shipzy.ai/track — and find rated destination forwarders before your cargo arrives.
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