What Detention and Demurrage Actually Are (and Why Importers Confuse Them)
Most importers use "detention" and "demurrage" interchangeably. That mistake costs money.
Demurrage is the fee charged by the ocean carrier when a full container sits at the port terminal beyond the carrier's free time allowance. The clock starts the moment the container is discharged from the vessel. Free time typically runs 3–5 calendar days at major U.S. ports, though it varies by carrier and port.
Detention is the fee charged when an importer holds the carrier's equipment — the container itself — beyond the allowed free period after it leaves the terminal. Once you pick up the box and take it to your warehouse, you're on detention time. Free time here is usually 3–5 business days.
These are two separate clocks, two separate invoices, and two separate entities billing you. Demurrage is billed by the terminal or carrier. Detention is billed by the carrier. Knowing which fee you're fighting changes your entire dispute strategy.
In 2023, U.S. importers paid an estimated $8–10 billion in combined detention and demurrage fees. A significant portion of that was avoidable.
Why the Fees Stack Up So Fast
The daily rates are not trivial. At Los Angeles/Long Beach, a 40-foot container in demurrage can run $150–$200/day in the first tier, climbing to $450–$600/day after day 9. Some carriers charge over $1,000/day for extended overstays.
Detention rates vary by carrier but typically start at $75–$150/day and escalate after day 4 or 5.
A container that sits 10 days past free time at LA/LB, then gets held at your warehouse for an extra week, can easily generate $5,000–$8,000 in combined fees on a single shipment. Multiply that across 20–30 containers per month and you have a line item that rivals your freight cost.
The escalation structure is intentional. Carriers and terminals want their equipment returned. The fee tiers are designed to hurt.
The Real Causes of Excessive Charges
Before you can eliminate fees, you need to know what's actually causing them. Most fall into one of five categories:
1. Late or Incomplete Documentation
If your Importer Security Filing (ISF) is late or your entry documents aren't filed before vessel arrival, CBP can issue a hold. A CBP Intensive Examination (EXAM) or Document Review hold adds days to your demurrage clock. You cannot pick up a held container. The carrier doesn't care — the clock runs anyway.
Under 19 CFR 149, ISF must be filed 24 hours before vessel departure from the last foreign port. Miss that window and you're starting the import on the back foot.
2. Customs Exams
There are three main exam types: Document Review (least intrusive), VACIS/X-ray, and Intensive Exam (CET/Tailgate). A VACIS exam at a busy port can add 3–5 days. A CET (Centralized Examination Station) exam can add 7–14 days and requires the container to be trucked off-port, which sometimes triggers detention from the moment it moves.
You can't prevent exam selection entirely, but you can reduce exam rates over time by enrolling in Customs-Trade Partnership Against Terrorism (C-TPAT). C-TPAT certified importers statistically receive fewer intensive exams.
3. Warehouse and Trucking Scheduling Failures
This is the most common and most preventable cause. The container arrives. The trucker can't get an appointment at the terminal. Or they get to your warehouse and there's no dock space available. Or your receiving team didn't know the container was coming.
Every one of those failures costs you real money at a daily rate.
4. Port Congestion
Congestion at terminals like LA/LB, New York/NJ, and Savannah can make it physically impossible to get a truck into the terminal during free time. This is where Force Majeure and FMCSA/FMC dispute provisions become important — more on that below.
5. Incorrect Container or Booking Information
Wrong container numbers, wrong port of discharge, incorrect commodity descriptions — any discrepancy between your entry and the carrier's manifest can trigger a hold while corrections are processed. This is an administrative failure that's entirely within your control.
The Operational Playbook to Prevent Fees
Here's what high-volume importers do differently.
Track Every Container from the Moment It's Booked
Use a platform — CargoWise, Flexport, or even a structured spreadsheet — to track vessel ETAs, actual arrivals, and free-time expiration dates for every container. Don't rely on your freight forwarder to alert you. Set your own alerts.
Know the last free day (LFD) before the container is even discharged. Work backward from that date to set internal deadlines for documentation, trucking appointments, and warehouse scheduling.
Negotiate Free Time Before You Book
Free time is negotiable. Most importers never ask. If you're moving consistent volume — even 10–15 containers per month — you have leverage to negotiate 7–10 days of free time into your service contracts instead of the standard 3–5. Get it in writing in your Service Contract or Bill of Lading terms.
At current demurrage rates, an extra 4 days of free time on a 40' container at LA/LB is worth $600–$800 per box. On 100 containers a year, that's $60,000–$80,000 preserved.
Pre-Pull Containers Before the LFD
If you know a container will be stuck — exam, warehouse capacity issues, anything — pre-pull it to an off-dock CFS (Container Freight Station) or bonded warehouse before the last free day. Yes, you'll pay drayage and CFS storage fees. But CFS storage typically runs $25–$45 per day, versus $450+ in terminal demurrage. The math is obvious.
Build a Reliable Drayage Network
A single-trucker dependency is a fee factory. If that trucker has a breakdown, a scheduling conflict, or misses a terminal appointment window, you're paying for it. Maintain relationships with at least two or three dray carriers at each major port you use. Terminal appointment systems like the ones at GCT Bayonne or TRAPAC LA are competitive — having multiple carriers competing for your load means faster pickup execution.
Align Receiving Hours with Container Arrivals
Your warehouse receiving hours matter more than most operators realize. If your dock closes at 3 PM and your trucker can only deliver at 4 PM, you're adding a full day to your detention clock. Consider extended receiving hours or after-hours protocols during peak shipping seasons (August–November) when vessel bunching creates compressed delivery windows.
Disputing Fees You Shouldn't Have Paid
Even with perfect operations, you will sometimes receive demurrage or detention invoices that are unjust. The Federal Maritime Commission (FMC) has authority over these disputes under the Ocean Shipping Reform Act of 2022 (OSRA-22).
OSRA-22 was a significant shift. It requires ocean carriers to have clearly defined rules for free time, fee escalation, and dispute resolution — and it explicitly prohibits carriers from charging fees when the cause of the delay was within the carrier's or terminal's control.
If a container was held due to a vessel delay, a terminal equipment failure, or a port congestion event caused by the carrier's own blank sailing schedule — that is a legitimate dispute. Document everything: terminal gate camera timestamps, trucker dispatch records, terminal appointment confirmations, vessel arrival notifications.
File your dispute within 30 days of the invoice. Most carrier tariffs have short dispute windows, and missing them eliminates your leverage. Reference the carrier's published tariff rules (available on their website under Tariff/Detention & Demurrage Rules) and cite the specific provision you believe was violated.
For disputes over $50,000, consider filing a formal complaint with the FMC at fmc.gov. The FMC's Bureau of Enforcement has increased its scrutiny of carrier D&D practices significantly since OSRA-22 passed.
Building the Right Data Habit
Operators who eliminate D&D fees don't do it with a single fix. They build a tracking system that makes every fee visible.
Log every D&D invoice with the following fields: container number, port, carrier, cause code, days over free time, fee amount, and whether it was disputed. After 90 days, you'll see patterns. Maybe 60% of your demurrage charges trace back to one origin port. Maybe one forwarder consistently files entries late. Maybe one carrier's free time calculation is wrong.
Data turns D&D from an unpredictable cost into a manageable, improvable metric. Aim to get your D&D cost as a percentage of total freight spend below 2%. Best-in-class importers run below 1%.
What to Do Starting Today
You don't need a software overhaul or a new 3PL to reduce these fees immediately.
- Pull your last 90 days of D&D invoices and identify the top three causes.
- Call your freight forwarder and ask for the LFD on every open container — right now.
- Ask your next carrier quote to include 7 days of free time as a negotiating point.
- Set up a shared tracking sheet your ops and warehouse teams both update daily.
- Review the FMC's D&D guidance at fmc.gov and know your rights before the next dispute lands.
Detention and demurrage are not a cost of doing business. They are a symptom of a process gap — and process gaps can be closed.
Ready to take control of your import operations and stop paying fees that shouldn't exist? Get started with Regenerate Trade today and work with a team that tracks these details so you don't have to pay for them.