A container can sit dead still at the dock while every piece of paperwork it needs moves around it like weather nobody controls. Rotterdam’s Secure Chain initiative states the reason in a few lines of its FAQ: a container’s commercial release comes from the shipping line or its agent, a second release comes from customs, and to collect the box at a terminal both are required.
Customs release vs carrier release is usually treated as one step with two names. It is two decisions from different parties. Customs decides whether the goods may enter the country, the shipping line decides whether it will hand the box over, and at some terminals collection also needs a time slot requested in advance. Rotterdam’s FAQ requires both of the first two before collection. Some movements run on different terms: for boxes moving inland against an in-bond bill, Hapag-Lloyd’s US guide sets its charge-waiver conditions around customs release at the inland terminal before the last free day.
Rotterdam shows how many parties sit behind those two words. Portbase, the port community system of the Dutch ports, tracks an import container through three phases, the last of them collection. The middle one, release, carries three indicators (the commercial release one only inside the Secure Chain) on the Cargo Controller Import screen: customs inspection, commercial release and import declaration. The third phase adds more: the nominated inland operator and the pre-notification at the terminal (both only inside the Secure Chain), then the gate-out, a status that is shown only for some discharge terminals.
What the customs yes covers
Customs release is the destination authority’s yes to the goods entering under the declared procedure. Portbase’s screen shows customs as its own indicator, customs inspection, and its short-sea note lists “not blocked by customs” among the conditions for collecting a box. What customs looks at before it lets go is the declaration: classification, value, origin, duties, permits. A query on any of them, or a physical inspection, holds the release.
How early customs can say yes is partly a WTO matter. The Trade Facilitation Agreement entered into force on 22 February 2017 and binds only the members that accepted it. Under Article 7.1 a member allows import documents, manifests included, to be lodged before the goods arrive, so processing starts with the ship still at sea. Article 7.3 lets goods go ahead of the final duty calculation, provided all other regulatory requirements are met. The member may ask for the duties already determined plus a guarantee for the rest, or for a guarantee alone, and the guarantee may not exceed what is ultimately due. Paragraph 3.6 keeps the member’s right to examine, detain or seize the goods all the same.
What the shipping line wants first
Carrier release is the shipping line or its agent at destination making the cargo available to the party entitled to collect it. The FAQ words it as making the container available to the customer, and it gives the sequence: release usually follows the customer’s completed payments, and until the moment of release the container is blocked in the computer system of the terminal of arrival.
What the line wants differs by line, trade and bill type. Hapag-Lloyd’s detention and demurrage guide for the United States (May 2026 edition) shows how a line ties its own paperwork to the clock. Among other conditions, it waives line demurrage and terminal storage on truck carrier-haulage imports at US ports only if, five days before free time ends, customs clearance with no regulatory restrictions has come in (unless for documented reasons beyond the customer’s control), Hapag-Lloyd has received credit or freight payment, and it has received the original bill of lading “if applicable”. The last condition is the one that depends on the paper. With an original bill of lading the carrier releases against the surrendered original, and the ITIC guidelines for agents warn that delivering to a party without one breaches the bill contract and lets the legal holder sue the carrier, the owner or whoever handed the cargo over. How the bill ties to a bank’s payment is a separate story, told in our piece on letters of credit and bills of lading.
A telex release skips the courier. The original is surrendered at one port, usually the port of loading, and the discharge port is told to release without collecting one. ITIC calls this risky because no bill is collected at the discharge end, and its claims review (dated 22 March 2012) describes how it went wrong at a Dutch port. Two containers were consigned to the same company. The shipper told the loading agent to release one. That instruction reached the discharge agent, who released both. The consignee never paid for the second, and the shipper went after the line for EUR 76,000, the value of that cargo. The claim settled, after negotiation, for EUR 66,000, which was claimed from the discharge agent. ITIC’s release guidelines add that it has seen forged emailed release instructions, so the authority behind a telex release gets checked before cargo moves.
A sea waybill removes the original altogether. It carries no title to the goods. As a general rule, ITIC’s guidelines say, the consignee need not produce an original, though the agent should check the position in its own country. The agent matches the person at the counter to the named consignee. Asking for a copy of the waybill or the arrival notice is, in ITIC’s words, a sensible precaution. The CMI Uniform Rules for Sea Waybills keep delivery simple (rule 7): the carrier delivers to the consignee on proper identification, and is not liable for wrong delivery if it can prove reasonable care in checking. They apply only where the contract adopts them. Payment does not disappear with the original. In the Hapag-Lloyd list credit or freight payment is its own item, and only the bill carries “if applicable”.
Rotterdam had its own version of that weak spot. The old commercial release was a PIN code from the line or its agent. The Secure Chain FAQ says the codes were often widely shared, and in principle whoever held one could collect the container. Trade lanes switched one at a time. Latin America went on 31 March 2024, North America on 1 July 2024, Africa, the Middle East, India and Pakistan on 1 October 2024. Then came the Far East and Oceania. Portbase announced on 4 March 2025 that deep-sea lines and agents no longer issue PIN codes for containers arriving in Rotterdam from those regions. Today the FAQ says all containers handled by the 12 largest deep-sea lines and agents there are released through the Secure Chain, and names connecting the short-sea sector as the 2026 focus, with the remaining deep-sea parties after that. Inside the chain the right to collect travels digitally from line to forwarder to inland operator, and only an authorised inland operator can pre-notify at the deep-sea terminal.
The terminal, and the clock that runs while you wait
Terminal release is the terminal being ready to hand the box over. Portbase’s support note on short-sea boxes lists three conditions: discharged, released by the carrier, not blocked by customs. It also names accepted import documents as one of the requirements. A truck then needs a visit. According to Portbase’s guide for forwarders and importers, the pre-notification asks for a specific time slot depending on the terminal, and the terminal status that Cargo Controller shows is a snapshot that not every terminal refreshes automatically. Portbase tells users to check its date and time.
While all this sorts itself out, free time is running. Maersk’s terms for detention and demurrage start the demurrage clock at discharge. Detention starts at gate-out, and a combined charge, where the line uses one, runs from discharge (or from gate-in full at an inland depot). Demurrage is what the merchant pays for holding the carrier’s container inside the terminal beyond free time, and it stops at gate-out. Detention is what the merchant pays for holding it outside the terminal, from gate-out until the empty box is back at the agreed depot. The FMC’s 2015 report on detention, demurrage and free time frames demurrage as a charge for space and detention as a charge for equipment, and also notes that the terminology and application of charges with similar names are distinct across carriers. Read the tariff of the line on the bill of lading.
At Hapag-Lloyd customs can move that clock. Its US guide adds that when a container is put on customs hold for no fault of the customer, the line stops its own demurrage and detention clock and restarts it when the hold lifts. A box held inside a marine or rail terminal starts counting from the release date. A box held outside, at a customs warehouse, starts its detention free time the day after release. The terminal’s own storage charges for the hold days stay with the customer, and the same guide says so.
The US adds a check on the bill itself. Since 28 May 2024 the FMC rule at 46 CFR part 541 requires a demurrage or detention invoice from a carrier, terminal operator or NVOCC to show, for imports, the container availability date next to the start and end of free time. Set that date against your own release dates. If required information is missing, the billed party no longer owes that charge (541.5). One piece of the rule is gone: the D.C. Circuit set aside section 541.4, the bar on billing motor carriers, on 23 September 2025, and the FMC removed it on 29 December 2025. The rest stays in force.
Which comes first
There’s no fixed order that I can find stated. Either release can land first, and the line may still be waiting on payment after customs has cleared the goods. That is my reading, and the Portbase screen fits it: customs inspection, commercial release and import declaration sit side by side as separate indicators, and the phase turns green only when all of them are.
After that the Secure Chain adds its own sequence. A forwarder waits for the commercial release from the line, nominates an inland operator, the operator pre-notifies at the terminal, and the terminal’s answer comes back into the same screen as yellow or red. Portbase’s colour key has a grey for “status not yet known”, so one indicator can be confirmed while another is still waiting.
For a shipper the working question is which of the three parties still owes a release today. Customs release vs carrier release also shows up in dates. Hapag-Lloyd’s US guide shows the kind involved, though they are its conditions for waiving charges and not release steps: the delivery order five days before the vessel arrives, customs clearance, payment and the original bill five days before free time ends. Navo24’s TrackingMCP puts the carrier’s published free time on the container and sends a signed webhook when an ETA moves, a box is discharged or a hold appears. The demurrage and detention page shows how that looks at the desk.
Frequently asked questions
A US demurrage invoice reached me six weeks after the last day it covers. Do I still have to pay it?
Under the FMC rule at 46 CFR 541.7, a carrier or terminal operator must issue the invoice within 30 calendar days of the day the charge was last incurred. If it misses that, the billed party is not required to pay. An NVOCC has 30 days from the date of the invoice it received itself. You then have at least 30 days from the invoice date to ask for mitigation, refund or waiver, and the billing party must try to resolve the request within 30 days of receiving it (541.8).
Do customs have to hurry when my container is full of fruit?
Where the WTO Trade Facilitation Agreement applies, yes, up to a point. Article 7, paragraph 9.1 says, once all regulatory requirements are met, that perishable goods are released within the shortest possible time under normal circumstances, and outside customs business hours in exceptional ones. Customs must also give perishables priority when scheduling examinations. The duty sits with customs only. The line's commercial release and the terminal's slot are outside it, and for storage paragraph 9.3 of Article 7 only says the member either arranges it or lets the importer arrange it.
The cargo is on a sea waybill. Can the seller still change the consignee after the ship has sailed?
Yes, if the contract adopts the CMI Uniform Rules for Sea Waybills and the shipper has not handed control to the consignee. Rule 6 gives the shipper the only right to instruct the carrier and to change the consignee's name until the consignee claims delivery at destination. The shipper must give reasonable notice in writing, or by another means the carrier accepts, and cover the carrier's extra cost, unless the applicable law prohibits the change. The shipper can hand the right of control to the consignee, but only up to the moment the carrier receives the goods, and it must be noted on the waybill.