The freight quote was competitive, the container arrived on schedule, and three weeks later an invoice appears for an amount nobody budgeted. Demurrage and detention are the most avoidable costs in container importing and among the most common. This article is for companies importing FCL from China — a container and up — and explains what the two charges actually are, when each clock runs, and the specific decisions that keep them at zero.
Two charges, two clocks, two owners
- Demurrage is charged by the shipping line for a loaded container sitting inside the terminal beyond its free time. Think of it as rent on port space.
- Detention is charged for keeping the carrier's container itself outside the terminal for too long — from gate-out until the empty is returned. Rent on the box.
They are billed separately, often by different departments, and both can run on the same shipment: a container that clears late and then sits at your warehouse racks up demurrage first, detention second. A third charge, storage, may also come from the terminal itself rather than the line — separate contract, separate invoice, same cargo.
How much free time you get, and what a day costs
Free time is contractual, not statutory. Typical ranges are 3–7 free days for demurrage and 4–7 for detention, varying by carrier, port and trade lane. Beyond that, daily charges commonly sit in the $150–$300 per container per day band at major ports, with escalating tiers — the second week costs materially more per day than the first — and congested gateways going well above that.
Two structural details matter more than the headline number:
- The tiers escalate. Budgeting "a few days at the day-one rate" understates a week-long delay badly.
- Free days are usually calendar days, not working days. A container discharged on a Friday with four free days is on the meter by Tuesday, and the weekend did nothing for you.
Why the clock starts earlier than importers expect
This is where most of the money is lost. The demurrage clock generally starts from discharge or container availability, not from the day you were told the goods were ready, and certainly not from the day your broker filed the declaration. Everything that happens after discharge — document corrections, customs examination, payment timing, a truck that was not booked — happens on your meter.
Which means demurrage is rarely a shipping problem. It is a documents-and-scheduling problem that shows up as a shipping invoice. The document set has to be complete and consistent before arrival, not after — see import documents from China and, on the single document that most often causes a hold, the bill of lading explained.
The five causes worth designing out
- Telex release or original B/L not sorted. No release, no pickup, meter running. Agree the release method at booking, not at arrival.
- Documents that disagree with each other. Invoice, packing list and B/L must match to the digit; a mismatch triggers a query, a query costs days — see the commercial invoice and packing list.
- Payment not cleared to the line. Freight and local charges unpaid means no release, regardless of who was supposed to pay under the Incoterm.
- Customs examination. Not fully avoidable, but a correct HS code and clean documentation reduce the odds — how to determine the HS code.
- No truck and no slot booked. Haulage capacity at peak season needs booking before the vessel arrives, not on the day free time expires.
How to keep it at zero
- Negotiate free time before booking, when you still have leverage. With volume, combined free time is negotiable well beyond the default, and some contracts pool demurrage and detention into a single allowance — far more forgiving operationally.
- Get the free-time terms in writing on the booking confirmation, naming days and whether they are calendar or working days.
- Prepare documents to arrive before the vessel does. Every document ready and cross-checked at the point the ship sails.
- Confirm the release mechanism and who pays what under the agreed Incoterm. DDP moves this problem to the seller entirely — see DDP terms when importing from China.
- Book haulage against the ETA, and re-confirm when the ETA moves.
- Return the empty promptly. Detention runs after unloading, and depot queues at quarter-end are real.
- Watch the calendar. Arrival into a national holiday, or into the congestion around Chinese New Year and Golden Week, compresses everything — see production and shipping around Chinese New Year 2027.
If the invoice has already arrived
Do not pay it on sight. Validate it:
- Reconcile against the gate-in and gate-out timestamps and the discharge date, not the carrier's summary line
- Check the free time actually granted in the booking confirmation against the free time applied
- Check that demurrage and detention are not both billed for the same period on the same box
- Identify days lost to causes outside your control — vessel bunching, terminal congestion, a carrier system outage — and dispute those specifically
- Where the delay was caused by a customs examination that found nothing, say so in the dispute
Carriers do waive and reduce charges, particularly for customers with a forward booking pipeline, but only against a specific factual argument. "It seems high" is not one.
Where this fits in your landed cost
Demurrage and detention belong in the same mental column as customs duty and haulage: costs that arise after the freight rate is agreed and that a low freight rate can quietly conceal. The full arithmetic is in landed cost of a China import, and the composition of the rate itself is in why container rates differ threefold.
Nobody sells you demurrage. It is what the system charges when the paperwork, the payment or the truck is late — which is why it is the one shipping cost you can reliably drive to zero without negotiating a single dollar off the freight rate.
Keeping containers moving
We prepare and cross-check the document set before the vessel sails, agree the release mechanism at booking, negotiate free time as part of the rate rather than after it, and book haulage against the live ETA. Seven years of doing this sits behind 3,500+ deliveries — real projects are in our case studies.
See logistics from China and sea freight, or customs brokerage for the clearance leg.
