This guide explains the operational difference between the three charges and provides a practical workflow for controlling them. Exact definitions, free-time rules and tariffs vary by carrier, terminal, port and contract, so shipment-specific terms should always be checked.

1. The three charges in plain language

Demurrage

Demurrage generally applies when a carrier-owned container remains inside the terminal beyond the allowed free time. For imports, the clock is commonly linked to container availability or discharge, depending on the carrier’s published rules and the applicable contract.

Detention

Detention generally applies after the container leaves the terminal and stays outside the terminal longer than the allowed equipment free time. It ends when the empty container is returned to the nominated depot or terminal and the return is accepted.

Port or terminal storage

Storage is charged for cargo or a container occupying terminal space. It is normally a terminal or port charge, separate from a carrier’s demurrage, although invoices and local terminology can make the distinction less obvious.

2. Why importers incur avoidable charges

• Original documents or release instructions arrive late.
• Customs entries are filed only after vessel arrival.
• Commercial documents contain inconsistent values, quantities or consignee details.
• A delivery appointment or truck is not available during free time.
• The consignee’s warehouse has no receiving capacity.
• The nominated empty-return depot changes or rejects the container.
• Weekends and holidays are assumed to be excluded when the tariff counts calendar days.
• Teams track the vessel ETA but not cargo availability and last free day.

3. Build a charge-control timeline

Before departure

Confirm the bill of lading release method, destination agent contacts, expected free time, required import permits and the party responsible for customs clearance, payment, trucking and empty return. If extra free time is commercially important, negotiate it before booking rather than after arrival.

Seven to ten days before ETA

Review the latest ETA, prepare the customs entry, verify commercial documents and confirm whether the consignee can receive the cargo. Share container numbers and provisional delivery requirements with the broker and trucker.

After discharge or availability

Record the actual availability date and obtain written confirmation of the last free day for each relevant charge. Do not calculate deadlines from ETA alone: a vessel can arrive before a container becomes available, or cargo can be placed on hold.

After gate-out

Track the container to delivery, unloading and empty return. Ask the driver for an equipment interchange receipt or other proof showing the date, time, container number and return location.

4. A responsibility matrix prevents gaps

5. Practical prevention checklist

6. What to do when delay is unavoidable

Notify the carrier, terminal, forwarder and trucker early. Ask whether an appointment, extension, alternate depot or paid pre-pull arrangement is available. Keep a written event log. If charges are disputed, separate the factual timeline from commercial arguments and provide supporting records for each date.

7. FAQ

Are demurrage and storage always billed by the same party?

No. A carrier may bill demurrage while a terminal or port bills storage. Local arrangements vary, so verify the issuer and tariff behind every invoice.

Does free time always exclude weekends and public holidays?

No. Some tariffs count calendar days, while others apply different rules. Never assume an exclusion without checking the applicable terms.

Can a forwarder guarantee there will be no charges?

A forwarder can coordinate and monitor the shipment, but customs holds, terminal congestion, appointment shortages and consignee readiness may remain outside one party’s control. Clear responsibilities and fast escalation reduce risk.

Suggested internal links

Link this article to your guides on ocean booking confirmations, shipment trackers, bill of lading amendments and destination customs documents. Together, they support readers from booking through final container return.