Demurrage and Detention Charges Explained for USA Ports

For US importers, Amazon FBA sellers, and first-time shippers, demurrage and detention fees are among the most common unexpected costs in ocean freight. Understanding these charges—and how to avoid them—can save you significant money and prevent delays.

This guide explains what demurrage and detention are, how they are calculated, and best practices for US ports.

1. What Is Demurrage?

Demurrage refers to charges applied when a container remains at the port or terminal beyond the allowed free time.

• Free time is the period carriers allow for picking up or unloading containers at the port without additional fees.

• Once free time expires, demurrage fees accrue daily.

Example:
A container arrives at the Port of Los Angeles with 5 free days. If you pick it up on day 7, you pay demurrage for 2 days.

2. What Is Detention?

Detention charges apply when the container is taken out of the port but not returned to the shipping line within the allowed free period.

• Detention encourages timely return of containers for reuse.

• Detention fees start accumulating after the allowed number of days.

Example:
You pick up a container from the port, but return it 5 days late. You pay detention charges for those 5 days.

3. Differences Between Demurrage and Detention

Key Point: Both fees are billable per day per container and can escalate quickly.

4. Factors Affecting Demurrage and Detention

1. Port Congestion – delays in unloading containers increase demurrage risk.

2. Customs Delays – inspections or missing documents can prolong port stay.

3. Peak Season – high import volumes shorten free time.

4. Carrier Policies – free time and rates vary by shipping line and port.

5. Container Type – 20’ vs 40’ vs refrigerated containers may have different fees.

Tip: Always check your carrier’s demurrage and detention schedule before shipping.

5. How Charges Are Calculated

• Demurrage: Daily rate × number of days beyond free time

• Detention: Daily rate × number of days container is late returning

Example:

• 40HQ container at Port of Los Angeles

• Demurrage: $150/day after 5 free days

• Detention: $100/day after 7 free days

If the container is delayed 3 days at the port and returned 2 days late, total charges = (3 × 150) + (2 × 100) = $650

6. Practical Tips to Minimize Charges

1️⃣ Plan Ahead

• Know the expected vessel arrival

• Schedule trucking in advance

• Coordinate with warehouse or Amazon FBA delivery

2️⃣ Submit Documents Early

• Accurate commercial invoice, packing list, B/L, ISF

• Expedite customs clearance

3️⃣ Use Experienced Freight Forwarders

• Forwarders can advise on free time, port operations, and document handling

• They may arrange terminal appointments or pre-clearance

4️⃣ Consider Door-to-Door Shipping

• Reduces the risk of demurrage and detention by including pickup, customs, and inland transport in one service

5️⃣ Communicate with Carriers

• Some carriers offer grace periods or negotiate fees if delays are beyond importer’s control

7. Common Mistakes

• Ignoring port free time and assuming it lasts for weeks

• Late customs submission

• Choosing carriers with unclear or short free time

• Miscommunication with trucking or warehouse partners

Even a small oversight can result in hundreds or thousands of dollars in fees.

• Demurrage: Charges for containers left at the port beyond free time

• Detention: Charges for containers not returned to the shipping line on time

• Both fees are per container, per day and can add up quickly

• Planning, accurate documentation, and experienced forwarders are key to minimizing costs

At WAYTRON LOGISTICS LIMITED, we help US importers and Amazon FBA sellers monitor demurrage and detention, schedule pickups, and coordinate inland delivery, ensuring your shipments from China to USA ports remain cost-effective and on schedule.