How to Avoid Demurrage and Detention Charges in Shipping

To avoid demurrage and detention charges in shipping, negotiate longer free time in your carrier contracts, file customs paperwork accurately before the vessel arrives, coordinate drayage and empty returns so containers move within the free-time window, and hold carriers to the federal billing rules that let you refuse non-compliant invoices. Demurrage is what the terminal charges when your loaded container sits at the port past the allotted free time; detention is what the shipping line charges when its empty container or chassis stays with you too long. Most U.S. ports give four to five working days of free time, and the daily penalty escalates the longer you wait.¹

One quirk to keep in mind: free time is usually measured in working days, so weekends and holidays don’t count against the clock. Once free time expires, though, charges run on a calendar-day basis. A container that overstays across a weekend gets billed for Saturday and Sunday.¹ Daily rates typically double or triple after the first few days, by design: the fee schedule exists to push equipment back into circulation.

Negotiate More Free Time Before You Ship

The cheapest way to avoid demurrage is to build breathing room into your service contract before a single container moves. Use your annual volume and on-time record to push for free time beyond the standard four or five working days. If you regularly import through congested ports or ports with appointment backlogs, bring that data. Carriers weigh these requests against equipment availability at origin and demand for empties at destination, so framing the ask around their repositioning needs gives you leverage.

Whatever you negotiate, confirm the extension appears on every individual bill of lading. Misalignment between a master service contract and a specific booking is one of the most common reasons importers get billed at higher standard tariff rates. Catching that after the container is already accruing charges is too late.

File Documentation Early and Accurately

Most demurrage situations that spiral out of control start with a paperwork error or a late filing that triggers a customs hold. Getting cargo cleared quickly means getting documents right before the vessel arrives.

Importer Security Filing

The Importer Security Filing, commonly called the “10+2,” must be submitted electronically at least 24 hours before cargo is loaded onto the vessel at the foreign port. That deadline covers key data elements including the seller, buyer, importer of record number, manufacturer, country of origin, and Harmonized Tariff Schedule number for your goods. Two additional elements, the container stuffing location and the consolidator, can be submitted later but must arrive no later than 24 hours before the vessel reaches a U.S. port.²

A late or inaccurate ISF triggers a $5,000 liquidated damages claim per violation from CBP. For a first offense where law enforcement goals weren’t compromised, that amount may be reduced to between $1,000 and $2,000. Repeat violations get a floor of $2,500, and if CBP determines its enforcement mission was compromised, no relief is available.³ Beyond the fine, a missing or flagged ISF can trigger cargo holds that leave your container sitting at the terminal while demurrage climbs.

Entry Documents and Customs Clearance

Your commercial invoice must include an adequate description of the goods, quantities, values, and the appropriate eight-digit Harmonized Tariff Schedule subheading.⁴ Entry documentation, including CBP Form 3461, can be submitted before the merchandise arrives at the port of entry, which is what makes pre-clearance possible and lets cargo release before or immediately after the vessel docks.⁵

Get your customs broker the bill of lading, commercial invoice, packing list, and any required permits or certificates as early as possible. Consignee information has to match the federal identification numbers on file. Errors in the container number, piece count, or seal number are the clerical mistakes that trigger CBP examinations, and exams are where costs really escalate. An X-ray or tailgate exam runs roughly $150 to $350 per container, and an intensive exam involving full unloading and physical inspection can exceed $1,000 to $2,500, not counting the drayage to and from the exam site or the demurrage accumulating while your cargo sits in a Centralized Examination Station.

Move the Container Within Free Time

Share the cleared customs entry and delivery order with your drayage provider at least three days before the vessel discharges. The trucker needs that lead time to monitor terminal availability and book a pick-up appointment. Most major terminals require appointments through online portals, and missing your window can cost you a full day or more of waiting.

Confirm your warehouse is ready to receive cargo the moment the truck arrives. Delays at the unloading dock cascade backward fast: a driver stuck waiting cannot return to the terminal for another load, and after the first couple of hours, wait-time surcharges start adding up. Keep a list of backup drayage providers with valid port credentials. When your primary trucker has a driver shortage or a breakdown, that redundant capacity is the difference between picking up on the last free day and rolling into penalty territory.

Return the Empty Cleanly

Log into the carrier’s tracking portal daily to verify the Last Free Day for both terminal storage and equipment use. These systems show when a container was discharged from the vessel and when it became available for pickup. That availability date matters because, under FMC rules, carriers must include it on any demurrage invoice they later send.⁶

Here’s what gives the rule teeth: if the invoice doesn’t include the required information, you have no obligation to pay the charge. That’s written directly into federal statute.⁸ When an invoice arrives, compare it line by line against the required contents. Missing fields are your leverage.

The Reasonableness Standard

The FMC evaluates whether demurrage and detention charges are reasonable by asking whether they actually serve their purpose as incentives to move freight. When a shipper cannot retrieve cargo because the terminal is closed, appointments aren’t available, or the carrier failed to give timely notice that a container was ready, continuing to charge demurrage doesn’t incentivize anything.⁹

Government inspections get specific attention. Charging demurrage while cargo is held for a CBP exam, without any mitigation such as a waiver or free time extension, is likely to be found unreasonable. Escalating charges during a government inspection, or failing to cap them, draws the same conclusion.¹⁰ Detention charges assessed when a shipper simply cannot return an empty because the depot is closed or full face the same scrutiny.⁹

Filing a Charge Complaint With the FMC

If a carrier assessed charges that violate federal law, you can file a charge complaint with the FMC’s Bureau of Enforcement, Investigations, and Compliance by emailing beic@fmc.gov.¹¹ The submission should identify the carrier, describe how the charge violated the law, and include supporting documentation: invoices, bills of lading, proof of payment, and evidence such as screenshots of denied terminal appointments or gate closure notices.¹²

FMC staff investigate and contact the carrier for a justification. If they find a violation, the matter goes to the Commission’s Office of Enforcement, which can order refunds or impose penalties. The process applies to charges assessed on or after June 16, 2022, and only to charges from common carriers for cargo at U.S. ports.¹² If a carrier submitted a false or inaccurate invoice, the penalties under federal law can go beyond a simple refund.⁸

Plan for Port Disruptions

Port strikes, weather events, and terminal closures are where demurrage piles up fastest, because the delays are outside your control and often last days or weeks. Whether a carrier can reasonably charge demurrage during a disruption depends on the specific circumstances, and there’s no bright-line standard. A court has held that detention charges may still be reasonable if the shipper received advance notice of a port closure before picking up the container for return. The practical lesson: document everything, including when you learned about the disruption and every step you took to retrieve or return equipment.

Review your service contracts and carrier tariffs now, before a disruption hits, to understand exactly when demurrage and detention liability attaches. Carriers must give 30 days’ notice for rate changes in their tariffs, and they can only charge rates that were in effect on the day your cargo was tendered. A carrier cannot retroactively apply a new congestion surcharge to shipments already in transit. If a new surcharge appears on an invoice for cargo tendered before it took effect, challenge it.

Build flexibility into your supply chain for high-risk periods. Routing cargo through alternate ports, maintaining relationships with inland warehouses near secondary terminals, and keeping chassis reserved during labor negotiation windows all cost money upfront, but far less than weeks of compounding demurrage at a shut-down port. The importers who avoid the worst charges during disruptions are the ones who had a backup plan before the disruption started.

1
Federal Maritime Commission. Rules, Rates, and Practices Relating to Detention, Demurrage, and Free Time for Containerized Imports and Exports Moving Through Selected United States Ports
2
eCFR. 19 CFR Part 149 – Importer Security Filing
3
U.S. Customs and Border Protection. CBP Dec. 09-26 Guidelines for the Assessment and Cancellation of Claims for Liquidated Damages – Importer Security Filing
4
U.S. Customs and Border Protection. Commercial Invoice Requirements When Clearing or Filing Entry Documents With U.S. Customs and Border Protection
5
eCFR. 19 CFR Part 142 – Entry Process
6
Federal Register. Demurrage and Detention Billing Requirements
8
Office of the Law Revision Counsel. 46 USC 41104 – Common Carriers
9
eCFR. 46 CFR 545.5 – Interpretive Rule on Demurrage and Detention Under the Shipping Act
10
Federal Register. Interpretive Rule on Demurrage and Detention Under the Shipping Act
11
Federal Maritime Commission. Complaints and Assistance
12
Federal Maritime Commission. Guidance on Charge Complaint Interim Procedure