The fee nobody quotes you upfront
When you book ocean freight, you're quoted the ocean rate, the terminal handling, maybe a few surcharges. What you're almost never quoted is demurrage and detention, the two charges that kick in when a container sits too long, and they can dwarf everything else on the invoice. Container xChange's benchmark data puts the top seven most expensive locations for these fees all in North America, led by New York, Oakland and Los Angeles, where two weeks of delay on one box runs into the thousands.
The frustrating part is that these are not freight costs. They are penalty clocks. And penalty clocks can be stopped, if you know they're running.
Demurrage vs detention: what's the actual difference?
People use the terms interchangeably, but they bill for two different things, and the trigger for each is a specific milestone in your tracking data:
- Demurrage is charged when your full container sits inside the port terminal past its free time, waiting to be picked up. The clock starts at discharge and stops when the box leaves the gate.
- Detention is charged when you hold the carrier's container outside the terminal past its free time, typically while you unpack it at your warehouse. The clock starts at gate-out and stops when you return the empty.
- Storage is a related terminal charge, sometimes billed separately from demurrage, for the physical space the container occupies in the yard.
The simple way to remember it: demurrage is the box waiting for you at the port, detention is the box waiting for you at your dock. Both are counted in days, and both start the moment a specific event fires in your shipment timeline.
What it really costs in 2026
Rates vary by carrier and port, but the 2026 ranges are well documented. Demurrage typically runs $75 to $300 per container per day. Detention adds another $150 to $250 per day. Those numbers also escalate: many carriers use tiered pricing where the daily rate jumps after the first few chargeable days, so a delay that drags on gets more expensive per day the longer it runs.
$2,478 for one container, one delay
That's the approximate cost of a single container held 14 days at the Port of New York, according to Container xChange benchmark data. Multiply that across a few boxes in a bad week and demurrage stops being a rounding error and starts being a budget line. U.S. ports hold the top spots globally for these charges, so North American importers feel this hardest.
And this is on top of everything else. A container that triggers demurrage has usually already cost you in delayed inventory, rescheduled trucking and staff time chasing updates. The fee is just the visible part of the bill.
Why the charges are climbing again
After dropping about 25% from their pandemic peaks, demurrage and detention charges started rising again, and 2026 is not a quiet year for them. A few forces are stacking up:
- Charges rose 12 to 18% year over year heading into 2026, per Container xChange data, driven by renewed port congestion and disruption.
- Detention specifically climbed 25 to 30% over the past two years as equipment stayed in circulation longer.
- Red Sea reroutes pushed global port congestion up roughly 35%, and congestion feeds directly into D&D: ships bunch up, terminals back up, and free time runs out while your box waits in the queue.
- Congestion alone is adding an estimated 15 to 20% to demurrage and detention costs globally in 2026.
The pattern is clear: the same disruptions that delay your shipment also make the delay more expensive, because the meter is running on infrastructure that's more crowded than it used to be.
The clock starts earlier than you think
Every shipment comes with free time, the grace period before demurrage or detention starts. It's usually 3 to 5 days at the port for demurrage, though it varies by carrier, port and your specific contract. The trap is that free time starts at a milestone, not at the moment you find out about it. If your container was discharged on a Friday and you don't check tracking until Monday, you may have already burned three of your free days without doing anything wrong.
This is exactly why the delay between an event happening and you knowing about it is where D&D is won or lost. The charge isn't triggered by negligence. It's triggered by time, and time you didn't know was passing counts just the same.
The 2024 FMC rule changed who can bill you, and how
If you import into the United States, there's a regulation worth knowing, because it can void charges billed incorrectly. The Federal Maritime Commission's final rule on demurrage and detention billing took full effect on May 28, 2024, and it put hard requirements on how carriers and terminals can bill these fees:
- Invoices must be issued within 30 calendar days of when the charge was last incurred. Miss the window, and the billing party's claim weakens.
- Each invoice must include specific details: the date the container was made available, the port of discharge, the container number, and the start and end dates of free time, among others.
- The billed party gets at least 30 days to request a fee mitigation, refund or waiver, and the biller has to respond within 30 days.
- Critically, missing required information voids the obligation to pay that charge. An incomplete invoice is a disputable invoice.
One caveat: in September 2025, a U.S. Court of Appeals set aside the part of the rule specifying exactly who an invoice may be sent to, so the "who can be billed" question is less settled than the rest. But the billing-detail and timing requirements remain a genuine tool. If a demurrage invoice shows up missing its free-time dates or arrives months late, that's grounds to challenge it, not just pay it.
How tracking stops D&D before it starts
Almost every avoidable demurrage charge traces back to the same root cause: someone found out too late that the container had arrived. Fix the visibility problem and you fix most of the fees. Tracking the right milestones turns D&D from a surprise into something you manage:
- Act on the discharge event, not the ETA. The free-time clock starts when the box is discharged, so that's the signal that should trigger your customs and pickup process, ideally the same day.
- Pre-clear customs before arrival. File the entry while the vessel is still inbound so the container is ready to move the moment it lands, instead of sitting while paperwork catches up.
- Book trucking against the real ETA. A tracking feed that updates from vessel position, not the stale booking ETA, lets you line up drayage for the day the box is actually available.
- Watch the empty-return window. Detention runs until you hand the empty back, so track that deadline as closely as the pickup and pick a return depot that isn't backed up.
A simple routine that keeps the meter off
- Set an alert on the discharged milestone for every shipment, so the clock starting is something you're told, not something you discover.
- Know your free time per carrier and lane, and count backward from the deadline, not forward from arrival.
- Get customs and trucking moving on discharge day, not pickup day.
- Check every D&D invoice against the FMC billing requirements before paying. Late or incomplete invoices are disputable.
Check a charge before you pay it
Demurrage and detention feel like fixed costs of shipping, but they're closer to speeding tickets: you get them by not noticing the limit, and you avoid them by watching the road. The two things that keep the meter off are knowing what the charge should be, and knowing the instant your container moves. Estimate the exposure before it becomes an invoice, and make sure the discharge event reaches you the day it happens, not the week after.