Demurrage and detention are the silent margin killers of container shipping. This guide breaks down how these fees work at South Florida ports and the specific steps you can take to avoid them.
Demurrage vs. Detention: The Difference That Matters
Demurrage is a charge from the marine terminal for a container that remains in the port yard beyond the allotted free-time period. Think of it as parking fees for your container at the port. The clock starts when the container is available for pickup (vessel discharge + release) and stops when it exits the terminal gate.
Detention is a charge from the shipping line (carrier) for keeping the container equipment (the physical box) beyond the allowed time after it leaves the port. The clock starts at gate-out and stops when the empty container is returned to a designated depot or terminal.
In practice, shippers often get hit with both: demurrage because the container sat at the port too long, and detention because the empty wasn't returned quickly enough after delivery. At $150–$350 per day per container for each charge, a week's delay on five containers can easily exceed $10,000.
How Free Time Works at PortMiami and Port Everglades
Every container import shipment comes with a free-time allowance — the number of days your container can sit at the terminal and/or remain in your possession without charges accruing. Free time is set by the shipping line (not the port authority) and varies by carrier, trade lane, and contract terms.
Typical free-time windows at South Florida ports:
- •Import demurrage free time: 3–5 calendar days from when the container is available (discharged + released). Some lines offer 7 days on select trade lanes or for contract customers.
- •Import detention free time: 4–7 calendar days from gate-out. This is when the empty must be returned.
- •Export free time: Typically 5–7 days for loading. Varies significantly by carrier.
The 7 Most Common Causes of Demurrage and Detention
1. Delayed Customs Release
The container is physically at the terminal but Customs hasn't released it. This is the #1 cause of demurrage. If your entry filing is incomplete, flagged for exam, or waiting for a document correction, the clock keeps running. Your customs broker and your drayage provider need to be in constant communication about release status.
2. Late Freight Release
The shipping line hasn't released the container — usually because freight charges haven't been paid or the bill of lading hasn't been surrendered. This is entirely within your control and should be resolved before the vessel arrives.
3. Drayage Capacity Shortage
Your container is released and ready, but your drayage provider can't get a truck there in time. This happens most often during peak season (October–January) and when shippers rely on non-asset-based providers who sub-contract capacity.
4. Missed Gate Hours
PortMiami terminals generally operate 7:00 AM–5:00 PM on weekdays. Some terminals offer limited Saturday hours. If your drayage company dispatches a truck at 3:30 PM and the gate queue takes two hours, the driver is turned away. That's a wasted dispatch and another day of demurrage.
5. Chassis Shortage
The driver arrives at the terminal but no chassis is available. This is a chronic problem at busy ports. Asset-based drayage companies that maintain their own chassis pool avoid this entirely.
6. Warehouse Not Ready for Delivery
The container is picked up from the port on time, but the consignee's warehouse can't receive it — no dock appointment, warehouse full, or staff not available. The container sits on the chassis, and detention keeps accruing. Coordinate delivery appointments before dispatching the pickup.
7. Delayed Empty Return
After delivery and devanning, the empty container needs to go back to a designated return location. If the return depot is congested, has limited hours, or your drayage company treats the return as low priority, detention charges compound.
Practical Strategies to Minimize These Fees
Pre-Clear Everything Before Vessel Arrival
File your customs entry 5–7 days before the vessel's estimated arrival at PortMiami. Ensure freight charges are paid and the original bill of lading (or sea waybill) is in order. The goal is that when the container hits the yard, both customs and freight releases are already in place. Your drayage company should be checking release status the morning of vessel discharge.
Use an Asset-Based Drayage Provider
Companies that own their trucks and chassis don't compete for third-party capacity during peak season. They dispatch from their own fleet, on their own timeline. At New Roads Logistics, our asset-based fleet with dedicated Miami-based drivers means we control when your container moves — not a capacity marketplace.
Track Free Time Actively
Don't rely on the shipping line to notify you when free time is expiring. Maintain your own tracking spreadsheet or use your drayage provider's tracking tools. Know the exact free-time start date, expiration date, and daily charge rate for every container. Dispute clock discrepancies immediately — terminals sometimes get the available date wrong.
Book Warehouse Appointments Before Port Pickup
Reverse the typical sequence: confirm the warehouse can receive the container before you dispatch the truck to the port. This prevents the scenario where a container is picked up on time but sits on a chassis at the warehouse gate for two days because there's no appointment.
Prioritize Empty Returns
Treat the empty return as part of the same job, not a separate low-priority task. The best drayage providers schedule the empty return at the time of delivery dispatch. If your return depot has a long queue or limited hours, ask your drayage company about alternative return locations.
How to Dispute Unfair Demurrage Charges
Not all demurrage charges are legitimate. Under the FMC's Interpretive Rule on Demurrage and Detention (effective May 2020, updated 2024), charges must be tied to the shipper's actual ability to retrieve the container. If you were unable to pick up because the terminal was closed, the container wasn't accessible, or there was a port-side operational failure, you have grounds to dispute.
Steps to dispute:
- •Document everything: Save gate receipts, appointment confirmations, release timestamps, and driver check-in records.
- •File within the carrier's dispute window: Most lines require disputes within 30 days of the invoice.
- •Reference the FMC rule: Cite 46 CFR §545.5 and the principle of "incentive" — charges should incentivize cargo fluidity, not penalize shippers for port-side failures beyond their control.
- •Work with your drayage provider: A good drayage company will provide the documentation and support you need for disputes, because they have the gate receipts and dispatch logs.
Need reliable drayage from Port of Miami or Port Everglades? Get a free quote from New Roads Logistics — our bilingual dispatch team responds within one business hour.