How Container Detention & Demurrage Fees Work

If you've ever shipped goods internationally, you've likely encountered the terms detention and demurrage — two of the most misunderstood (and costly) fees in container logistics. At Augustus Transport, we believe transparency is the foundation of great service, so here's a straightforward breakdown of how these charges work and how to avoid them.

What Is Demurrage?

Demurrage is a charge levied by the shipping line (carrier) when a full import container is not picked up from the port or terminal within the carrier's free time allowance. In other words, it's the fee for keeping the container at the terminal beyond the agreed free period.

Free time typically ranges from 3 to 7 calendar days depending on the port, the carrier, and the trade lane. Once that window closes, demurrage charges accrue daily — and they can escalate quickly.

What Is Detention?

Detention is different — it's the charge for keeping the carrier's container (the equipment itself) outside of the terminal beyond the allowed free time. Once you've picked up a container and taken it to your warehouse or facility, the clock starts ticking. If you don't return the empty container within the free time period, you'll be charged detention.

Demurrage vs. Detention: A Simple Summary

Demurrage: Container sitting inside the terminal, not yet picked up → Carrier charges you for occupying terminal space.

Detention: Container taken out of the terminal but not yet returned empty → Carrier charges you for using their equipment.

In some cases, carriers combine these into a single "per diem" or "combined" free time structure — but many still separate them, so it's critical to read your contract carefully.

How Are These Fees Calculated?

Both demurrage and detention are calculated on a per-container, per-day basis. Typical rate structures work in tiers:

Days 1–5 after free time: Lower daily rate (e.g., USD 50–100/day per container) Days 6–10: Mid-range rate (e.g., USD 100–200/day) Day 11+: Higher rate (e.g., USD 200–400+/day)

The exact rates vary significantly by carrier, port, container size (20' vs 40'), and trade lane. These charges are invoiced directly by the shipping line and are the shipper's or consignee's responsibility.

Common Causes of Demurrage and Detention

Delays in customs clearance or document submission Shortage of transport or trucking capacity Warehouse not ready to receive goods Public holidays and port closures Disputes over cargo condition or quantity Slowness in returning empty containers after unloading

How to Minimise Demurrage and Detention Charges

Plan ahead: Know your free time allowances before the vessel arrives. Check with your freight forwarder or carrier well in advance.

Pre-clear customs: Submitting documents early and applying for customs clearance before vessel arrival dramatically reduces delays.

Book trucking in advance: Secure transport capacity early, especially during peak seasons or port congestion periods.

Monitor your containers: Use real-time container tracking to stay on top of arrivals, gate-out times, and return deadlines.

Negotiate free time: When booking, negotiate for extended free time — especially for large shipments or if you anticipate clearance delays.

Can Demurrage and Detention Charges Be Disputed?

Yes — in some cases. If delays were caused by factors outside your control (such as port equipment failure, carrier-caused late delivery, or incorrect documentation from the shipper's side), you may be able to dispute the charges. Keep thorough records of all communications, timestamps, and instructions to build your case.

How Augustus Transport Can Help

At Augustus Transport, we actively manage container timelines on your behalf — monitoring arrivals, coordinating customs clearance, arranging timely trucking, and returning empties promptly. Our proactive approach is designed to keep your supply chain moving and your detention and demurrage exposure to an absolute minimum.

Have questions about a specific shipment or need help navigating container charges? Get in touch with our team — we're here to help.