Demurrage & Detention Charges Explained: A Complete Guide for U.S. Trade Lanes
One of the most expensive pitfalls in international ocean freight—especially on U.S. routes—is unexpected demurrage and detention charges.
A small delay in customs clearance or inland logistics can quickly snowball into thousands of dollars in extra costs. The worst part? These charges vary significantly across carriers, and many shippers don’t fully understand how they work until it’s too late.
In this guide, we’ll break down:
- Key definitions you must know
- The difference between major charges
- A real-world cost comparison
- A detailed comparison of the top 7 carriers on U.S. routes
1. First, Understand the Key Terms
These terms are often confused—but they refer to different stages of the container journey.
| Term | Chinese | Where It Happens | Explanation |
|---|---|---|---|
| Demurrage | 滞港费 | At the port/terminal | Charged when the container is not picked up within the free time |
| Detention | 滞箱费 | Outside the terminal | Charged when the container is not returned after pickup |
| Per Diem | 柜租费 | Inland / rail yard | Essentially another name for detention (daily container usage fee) |
| Storage | 堆存费 | Terminal / yard | Charged by the terminal for occupying space (separate from demurrage) |
👉 Key takeaway:
- Shipping lines charge Demurrage / Detention / Per Diem
- Terminals charge Storage
A single shipment can incur multiple charges at the same time.
2. Why This Matters: A Real Cost Example
Let’s look at a real-world scenario:
A 40HC container at the Port of Los Angeles stays beyond free time by 5 days.
| Carrier | Free Time | Charge Structure | Cost for 5 Extra Days |
|---|---|---|---|
| Maersk | 4 days | Day 5–8: $300/day | $300 |
| MSC | 4 working days | Day 5–9: $80/day | $80 |
👉 That’s nearly a 4× difference for the same delay.
This is why choosing the right carrier—and understanding their tariff—is critical.
3. The Hidden Trap: Demurrage vs Detention
Many shippers assume these charges are similar—but they are structured very differently.
Demurrage (At Port)
- Starts after free time expires at the terminal
- Usually increases in tiers (progressive pricing)
- Can escalate quickly
Detention (Outside Port)
- Starts after container is picked up
- Depends on how long you keep the container
- Often stricter in inland U.S. logistics
👉 Important:
Even if you avoid demurrage, you can still get hit hard by detention.
4. Free Time & Charges Comparison: Top 7 Carriers (U.S. Trade)
Below is a simplified comparison of major shipping lines on U.S. routes (typical LA/LB conditions for 40HC containers):
| Carrier | Demurrage Free Time | Detention Free Time | Demurrage Rate (Approx.) | Detention Rate (Approx.) |
|---|---|---|---|---|
| Maersk | 4 days | 7–10 days | $300 → $345/day | $150 → $300/day |
| MSC | 4 working days | 8–10 days | $80 → $200/day | $100 → $200/day |
| CMA CGM | 4 days | 7–10 days | $150 → $300/day | $120 → $250/day |
| COSCO | 5 days | 7–10 days | $120 → $280/day | $100 → $220/day |
| Hapag-Lloyd | 5 days | 7–10 days | $150 → $320/day | $120 → $260/day |
| ONE | 4 days | 7–9 days | $140 → $300/day | $110 → $240/day |
| Evergreen | 4–5 days | 7–10 days | $130 → $290/day | $100 → $230/day |
⚠️ Note: Rates vary by contract, port congestion, and season. Always confirm with the carrier.
5. Why Costs Escalate So Fast
Several factors make U.S. routes particularly risky:
1. Strict Terminal Policies
Ports like Los Angeles and Long Beach enforce tight pickup windows.
2. Customs Delays
A single documentation issue can freeze your container for days.
3. Appointment System Bottlenecks
Truck appointment shortages can delay pickup even if cargo is ready.
4. Inland Congestion
Rail ramps and warehouses may delay empty return.
6. Practical Pitfalls: 5 Costly Details Most Shippers Miss
Even experienced shippers get caught off guard by the fine print. Here are five high-risk areas that frequently lead to unexpected charges:
① Is Free Time Counted in Calendar Days or Working Days?
This is one of the most common (and expensive) misunderstandings.
| Carrier | Free Time Counting Method | Key Notes |
|---|---|---|
| Maersk | Calendar Days | Weekends included; since 2024, overdue days always count as calendar days |
| CMA CGM | Calendar Days | Saturdays & Sundays included |
| COSCO | Calendar Days | No exception for weekends |
| MSC | Working Days | Non-operating terminal days not counted |
👉 Why this matters:
If you assume working days but the carrier uses calendar days, you can underestimate costs by 2–3 days instantly.
② When Does Free Time Actually Start?
Not all carriers start counting from the same moment.
| Method | Description | Impact |
|---|---|---|
| First Available Day (FAD) | Starts at 00:00 the day after discharge | Most common method |
| First Working Day | Starts from the first day the container is actually available for pickup | Used by some carriers like Hapag-Lloyd |
👉 Impact:
The same “4 days free time” can differ by 1–2 days in reality, depending on the rule applied.
③ Customs Inspection: Not All Delays Are Exempt
Many assume customs delays automatically qualify for fee waivers—but that’s not always true.
| Inspection Type | Typical Outcome |
|---|---|
| X-Ray / VACIS | Usually NOT exempt |
| Tailgate / Intensive Exam | May qualify for waiver or reduction with proof |
👉 Critical tip:
Always keep CBP Hold / Release timestamps. Without documentation, your dispute will likely be rejected.
④ Contract Rates vs Public Tariffs
The rates shown earlier are Tariff (public) rates—but they’re not what everyone pays.
| Type | Pricing Level |
|---|---|
| Tariff (Public Rate) | Full published rate |
| Service Contract Rate | Typically 30–50% lower |
👉 If you’re a freight forwarder or contract shipper:
- Always check your own D&D tariff in the carrier system
- Never quote customers based only on public rates
⑤ Inland (IPI) Moves Have Different Per Diem Rules
For shipments moving inland (rail or truck), pricing can change significantly.
| Destination Type | Notes |
|---|---|
| Port (LA/LB, etc.) | Standard demurrage/detention applies |
| IPI Inland (Chicago, Dallas, Memphis, etc.) | Separate Per Diem tariffs |
| Rail Ramps | May have extra free time OR higher rates |
👉 Important:
Always confirm the final destination, not just the port. Inland charges can sometimes be even higher than port charges.
7. When Can You Successfully Request Free Time Extensions?
Shipping lines do approve extensions—but only if you follow the proper process and provide solid evidence.
Common Valid Scenarios
| Situation | Required Proof |
|---|---|
| No terminal appointments available | Daily screenshots showing no slots |
| Customs holds (CBP) | Official CBP documents |
| Carrier-caused ERD changes | Evidence of revised empty return date |
| Force majeure (weather, strikes, terminal shutdowns) | Official announcements |
Critical Deadline
👉 Disputes must be filed within 30 days of invoice issuance
Late submissions are typically automatically rejected.
Example: Carrier Dispute Contact
- MSC (USA): usa-ny.detention@msc.com
- Other carriers: submit via their official Demurrage/Detention dispute portals
8. Final Advice: Control What You Can
At the end of the day, demurrage and detention are not just operational issues—they’re risk management issues.
The biggest mistakes usually come from:
- Misunderstanding rules
- Assuming all carriers behave the same
- Not documenting delays
👉 The difference between a smooth shipment and a costly one often comes down to a few overlooked details.
