Demurrage · Port Fees · Freight Knowledge
Demurrage and Detention Fees Explained: Avoid Extra Port Costs
Demurrage and detention fees are among the most unexpected costs in international shipping. Importers who miss free time windows at US ports can face charges of $100–$300+ per container per day — quickly eroding margins.
Demurrage vs Detention: What's the Difference?
- Demurrage — Charge for keeping a container at the port/terminal beyond free time after vessel arrival
- Detention — Charge for holding the carrier's container outside the port beyond free time (during delivery/unloading)
- Per diem — Another name for daily container holding charges
Free time is typically 4–7 days at US ports, depending on the carrier and port. After that, daily charges escalate.
Why Do Demurrage Charges Happen?
- Customs exam or documentation delays
- Importer not ready to receive cargo
- Missing ISF or incorrect customs entry
- Port congestion during peak season
- Trucking appointment delays for container pickup
With GSC DDP service, we manage customs clearance and delivery scheduling to minimize free time usage. See typical clearance timelines in our US customs clearance time guide.
How to Avoid Demurrage
- Ensure ISF and customs documents are filed before arrival
- Pre-arrange trucking and warehouse receiving
- Use a forwarder who tracks container release status daily
- Choose DDP for predictable all-in costs
Ready to Ship from China?
Avoid surprise port fees — get a DDP quote with customs and delivery managed by GSC.