Demurrage and Detention: What the Charges Mean and How to Avoid Them

Demurrage is what you pay when the container sits inside the terminal or depot beyond its free time. Detention is what you pay when the container is outside the terminal, in your possession, beyond its free time. One is rent on the space; the other is rent on the box. They are billed separately, they can run at the same time, and importers routinely pay both because they only knew about one.

These are the charges that turn a cheap shipment into an expensive one, and almost all of them are avoidable. This page sets out which clock starts when, who raises each bill, and what actually stops them.

Demurrage meaning in plain terms

Once your container is discharged from the vessel, the terminal gives you a number of free days to take it away. That is not generosity: a terminal is a transit facility, and a box standing on its yard is occupying a slot it needs for the next ship. When the free period ends, demurrage begins, and it is charged per container per day until the box leaves.

The same logic applies at an ICD or CFS, where the equivalent charge is usually billed as ground rent or storage on the cargo rather than on the box. The name changes; the meter does not.

Demurrage is normally raised by the terminal or the depot, and in practice it very often reaches you through the shipping line or your forwarder, who have already paid it to get the box released.

Detention meaning, and why it is not the same thing

Detention is the carrier’s charge for keeping its container beyond the agreed free period once you have taken it out of the terminal. The box is an asset the line needs back in circulation. From the moment it leaves the gate to the moment the empty is returned to the nominated yard, the detention clock runs.

That last part is what catches people. Clearing customs does not stop detention. Unloading your cargo does not stop detention. Returning the empty container does. A box de-stuffed on Tuesday and returned on Friday earns three more days of detention, and the invoice arrives weeks later when nobody remembers why.

How free days actually work

Free days are agreed at booking, not discovered at arrival. They differ by carrier, by trade lane, by container type and by customer, and a shipper who never asks gets the standard allowance. Three things are worth knowing about them.

• They are counted from a date the facility fixes — typically discharge or gate-out — not from when you received your documents or paid the duty. A supplier who couriers originals late has already spent some of your free time.
• Calendar days and working days are not the same. A weekend or a holiday run can consume a third of a short free period. Check which basis applies before you plan around it.
• The rate steps up in slabs. The first few chargeable days are the cheap ones; the rate then rises, sometimes sharply, and special equipment such as reefers and tanks starts higher and climbs faster. A week late costs far more than seven times a day late.

Free day allowances, slab structures and rates are revised regularly and differ between every carrier and terminal. Confirm the current position for your specific booking rather than assuming last shipment’s terms carried over.

What makes the clocks run, in the order we actually see it

1. Documents arriving after the vessel. The single largest cause. The bill of entry cannot be filed properly without the supplier’s set, and every day of waiting is billable. Filing an advance bill of entry before arrival is the cheapest fix available on almost any import.
2. The delivery order held for unpaid charges. Ocean freight, local charges or a carrier admin fee left unsettled will hold the release regardless of how ready your customs file is.
3. Classification or valuation queries. A description that does not match the HS code, or a value customs want justified. Our customs clearance page covers how these arise.
4. An agency requirement nobody expected. A commodity that turns out to need a certification, registration or licence. This is knowable at quotation stage and almost never is.
5. No transport arranged for the day of release. Out of charge on Friday afternoon with no truck booked means the weekend is billable.
6. The empty returned late. Detention only, and entirely self-inflicted — but very common, because the cargo feels finished once it is off the box.

What actually keeps the bills small

• Negotiate free days at booking, especially on a lane where you know clearance is slow or the commodity needs certification. Extra free days cost far less bought in advance than paid in arrears.
• File the bill of entry in advance. Advance filing before arrival collapses the most expensive part of the timeline.
• Chase the supplier’s documents while the vessel is still sailing, not when it berths. Ask for scans immediately and originals early; consider a telex release where payment is secure, which removes courier delay altogether — see our bill of lading page.
• Settle carrier charges before the vessel arrives so the delivery order is not the thing you are waiting on.
• Book the truck against the expected out-of-charge date, not after it happens.
• Return the empty the same day you de-stuff, and get the interchange receipt. That receipt is your evidence if a detention claim arrives later.
• Keep the dates. Discharge, gate-out, out of charge, de-stuffing and empty return. Most disputed invoices are settled or reduced by producing the timeline, and lost by not having it.

Bonded warehousing: the other way to stop the clock

Where duty cannot be paid immediately, or where the goods will be re-exported or released in batches, moving the cargo into a bonded warehouse is the structural answer rather than a tactical one. Goods are stored under customs control with duty deferred until they are cleared for home consumption, and the container itself goes back into circulation, so the detention clock stops.

It is not free — there is a warehousing charge, an interest position to understand, and the bonding procedure itself — and it makes sense for slow-moving stock, for goods awaiting a licence or certification, and for cargo being released against demand rather than all at once. It is the wrong answer for a consignment that is simply running a few days late. If you are weighing it up, the comparison to run is the carrying cost of bonding against the slab rate you would otherwise be paying.

Disputing a charge

Demurrage and detention invoices are frequently wrong, usually on dates rather than on rates. Common errors: free days counted on the wrong basis, the clock not stopped on the day the empty was actually returned, a port closure or carrier-caused delay charged to you, or the charge raised for a period when the container was under a customs hold outside your control.

Raise it in writing, quickly, with the timeline and the supporting documents — the interchange receipt, the out-of-charge record, the gate records. Carriers and terminals do issue waivers and reductions where the cause was demonstrably not the customer’s, but rarely on a verbal request and rarely months later. The evidence has to exist before you need it, which is the real reason to keep the dates as you go.

If you are looking at an invoice you do not think you owe, or you want the free days set properly on a lane before the next booking, send it to us. We handle these every week out of Ahmedabad and can usually tell you within a reading whether it is worth disputing.