Few things in importing are as frustrating as demurrage and detention fees. Your container sits at the port or terminal, and every day beyond the free period, charges accumulate — sometimes $100-$300 per container per day. Over a week, that can add $700-$2,100 to your shipment costs, eating directly into your profit margin.
Understanding the Difference
Demurrage
Demurrage is charged when your loaded container remains at the port terminal beyond the allowed free time. The terminal needs that space for incoming containers, so they charge you for occupying it.
Who charges it: The shipping line or terminal operator When it applies: From when the container is discharged from the vessel until it leaves the terminal Typical free period: 3-7 days (varies by port and shipping line) Typical rates: $75-$300 per container per day, escalating over time
Detention
Detention is charged when you keep the container (the physical box) beyond the allowed time for unpacking and returning it. Once you've collected the container from the port, the clock starts ticking.
Who charges it: The shipping line When it applies: From when the container leaves the terminal until the empty container is returned to the designated depot Typical free period: 4-10 days Typical rates: $50-$200 per container per day
How These Fees Escalate
Both demurrage and detention typically use tiered pricing that increases the longer you hold the container:
| Days Over Free Time | Typical Daily Rate (40ft) |
|---|---|
| 1-3 days | $100-150 |
| 4-7 days | $150-200 |
| 8-14 days | $200-250 |
| 15+ days | $250-350+ |
A container stuck for two weeks beyond free time could easily cost $2,500-$4,000 in combined demurrage and detention.
Common Causes of Delays
Customs Clearance Issues
- Incomplete or incorrect documentation
- Missing import licences or certificates
- Random inspection selection
- HS code classification disputes
Operational Issues
- No warehouse space available for delivery
- Truck or transport unavailable
- Port congestion and appointment backlogs
- Labour disputes or strikes
Financial Issues
- Unpaid duties or taxes
- Outstanding shipping line charges
- Missing original bill of lading
Strategies to Minimise These Fees
1. Pre-Clear Your Shipments
Submit customs entries before the vessel arrives. With pre-clearance, goods can be released immediately upon discharge, minimising terminal dwell time. Ensure all documentation is prepared well in advance.
2. Negotiate Extended Free Time
Free time is negotiable, especially if you have regular volume with a shipping line. Request 7-10 days free time for demurrage and 10-14 days for detention as part of your freight contract.
3. Arrange Transport Before Arrival
Book haulage and confirm warehouse delivery slots before the vessel arrives. Don't wait until the container is discharged to start organising collection.
4. Use a Reliable Customs Broker
A good broker prevents documentation errors that cause customs holds. The cost of a professional broker is far less than a week's demurrage.
5. Track Vessel Arrivals
Use vessel tracking tools to monitor your shipment's progress. If a vessel is delayed, you have extra time to prepare. If it arrives early, you can act quickly.
6. Consider Container Triangulation
Return empty containers to the nearest depot, not necessarily the one specified by the shipping line. Some lines allow this, reducing detention time.
7. Strip at the Port
If warehouse space is limited, consider stripping (unpacking) the container at a nearby container freight station. This returns the container quickly, avoiding detention, even if your goods need temporary storage elsewhere.
Disputing Unfair Charges
If delays were caused by factors outside your control:
- Port congestion — Some carriers waive charges if the port itself couldn't process containers
- Customs holds — If inspection was random (not due to your documentation errors), negotiate a waiver
- Carrier delays — If the shipping line's vessel arrived late, eating into your free time, request an adjustment
Always dispute in writing, promptly, with supporting evidence (vessel tracking data, customs release timestamps, appointment records).
Building These Costs Into Your Planning
When calculating your landed cost, include a contingency for potential port delay fees. For most importers, budgeting 1-2 days of potential overage per shipment is prudent. Track actual versus budgeted delay costs over time to refine your estimates.
Use your shipment management tools to log actual demurrage and detention charges per shipment, so you can identify patterns and negotiate better terms with your carriers.
Know your true landed cost
before you import
Calculate duty, shipping, FX rates, and Amazon fees in one place. See your real profit per unit before committing to a shipment.
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