Demurrage and Detention Explained: How to Avoid Container Charges
What demurrage and detention are, how free time works and how to avoid paying for late containers.
Demurrage and detention are daily charges for keeping a shipping line's container longer than the free time allowed. Demurrage applies while the full container stays inside the port or terminal. Detention applies while the container is outside the port, at your premises or a warehouse, until the empty is returned. Both are avoidable with planning, and both can add up quickly if a shipment gets stuck.
The difference in one line each
- Demurrage: the container is still in the terminal after its free days, for example because customs clearance is not finished or the consignee hasn't collected it.
- Detention: the container has left the terminal and is not back, empty, within the free days. For exports, detention can also apply if you collect the empty box early and hold it before loading.
Some shipping lines combine the two into one count of free days, often called "combined" or "merged" free time. Check how your carrier calculates it.
Free time
Every booking comes with a number of free days set by the shipping line, sometimes negotiated in the contract. After that, the daily rate usually increases in steps, so the second week costs more per day than the first. Rates differ by carrier, port and container type. Reefers and special equipment cost more.
Port storage is a separate charge. The terminal operator may bill storage for a container that stays in the yard, in addition to the shipping line's demurrage.
Why containers get stuck
- Documents not ready when the ship arrives, such as the original bill of lading, permits or a corrected invoice.
- Customs inspection or a hold for missing approvals.
- Freight or local charges not paid, so the delivery order isn't released.
- No truck booked, or the consignee's warehouse can't receive the cargo.
- Slow unloading and late return of the empty container.
How to avoid the charges
- Know your free time before the ship arrives, and whether it is counted separately or combined.
- Prepare documents early. Send the consignee the bill of lading or arrange an electronic or telex release before arrival.
- Pre-lodge customs where the system allows it, so clearance starts before discharge.
- Book trucking for the day the container is available.
- Unload quickly and return the empty to the depot named by the line.
- Negotiate more free days if you know the receiving side needs longer, for example for large project deliveries.
Common mistakes
- Assuming free time starts when you are told the container has arrived. It usually starts at discharge.
- Returning the empty to the wrong depot.
- Forgetting that public holidays usually count as free days used.
- Not checking the invoice. Ask for the dates used in the calculation and compare them with the discharge and gate records.
Roll-overs at the port can cause similar costs on the export side. See how to avoid container roll-overs from Jebel Ali.
Plan your shipment to avoid extra charges
Anil Darya handles FCL sea freight through Jebel Ali, including document release, customs and trucking coordination. Send us your route, container type and the time your consignee needs to unload to info@anildarya.co, and we will include free time terms in the quote.