The Cut-Offs at Laem Chabang: CY, SI, VGM, and Vessel Closing

Anyone booking a shipment through Laem Chabang will run into the word "cut-off" quickly — and often more than one kind of it. It's a term that gets used loosely, as if there's a single deadline a shipment either makes or misses, but in practice a shipment moves through several distinct cut-offs before a vessel sails, each one covering a different piece of the process and each one capable of causing a roll to the next sailing on its own, regardless of whether the others were met on time.

What "Cut-Off" Means at a Container Port

At its core, a cut-off is simply the deadline by which a specific piece of the export process needs to be finished before the terminal and carrier finalize their plan for a vessel call. Terminals and shipping lines work backward from a vessel's scheduled departure to set these deadlines, because loading a vessel, finalizing stowage, and preparing sailing documentation all take time and need a stable set of inputs to work from.

The reason there isn't just one cut-off is that these different pieces — the physical container, the shipping documentation, the weight verification — are handled by different systems and sometimes different parties, and each needs its own lead time before the vessel closes. Treating "cut-off" as a single date is the single most common source of confusion for shippers newer to booking through a major container port.

CY Cut-Off: Delivering the Container to the Terminal

The CY (container yard) cut-off is the deadline for physically delivering the loaded, sealed container into the terminal's container yard at Laem Chabang. This is the most tangible of the cut-offs — it's about the box itself arriving where it needs to be, not about paperwork — and it exists because the terminal needs the physical containers on-site with enough lead time to plan and execute the loading sequence onto the vessel.

For an FCL shipment, this generally means the trucking leg from the shipper's factory or warehouse to the terminal has to be planned with enough buffer that traffic, gate congestion, or a delayed container pickup from the depot doesn't push the delivery past this deadline. For an LCL shipment consolidated by a forwarder, the CY cut-off applies to the consolidator's container rather than the individual shipper's cargo directly, but the underlying logic — the physical box needs to be at the terminal on time — is the same.

SI Cut-Off: Submitting Shipping Instructions

The SI (shipping instruction) cut-off is the deadline for the shipper or their forwarder to submit final shipping instructions to the carrier — the data set that tells the carrier exactly how to draft the bill of lading, including the shipper and consignee details, cargo description, and any special notations. This is a documentation deadline, entirely separate from the physical CY cut-off, and it often falls at a different time.

Missing the SI cut-off doesn't stop the physical container from being loaded if it already made the CY cut-off, but it can mean the bill of lading is drafted from incomplete or default information, delayed, or in some cases issued with errors that then need correction after the fact — all of which cost time on the document side even when the cargo itself is already moving.

VGM Cut-Off: Verified Gross Mass

The VGM (verified gross mass) cut-off is the deadline for submitting the container's verified total weight — cargo, packing, and the container's own tare weight combined — to the carrier or terminal. This requirement exists under the SOLAS (Safety of Life at Sea) convention, an international maritime safety regulation, and it's separate from both the CY and SI cut-offs, sitting specifically on the weight figure rather than the physical box or the shipping documents.

A container that misses the VGM cut-off is generally not permitted to be loaded, regardless of whether it made the CY cut-off, because vessel stowage planning depends on accurate weight data for every container on board. This makes VGM one of the least forgiving of the cut-offs in practice — it's a safety-driven requirement rather than a purely commercial or administrative one.

Vessel Closing: The Terminal's Final Overall Deadline

Vessel closing (sometimes called the vessel cut-off) is the terminal's final, overall deadline for a given vessel call, after which the loading plan is generally locked and no further changes are accepted regardless of category. By the time vessel closing arrives, the CY, SI, and VGM cut-offs have typically already passed, and this final deadline functions as the terminal's confirmation that everything needed for that sailing is in place.

Because vessel closing sits after the other cut-offs, it isn't usually the one that catches shippers off guard — by the time it's relevant, a shipment has already needed to clear the earlier, more specific deadlines. It's still worth knowing about, because it's the reference point that the earlier cut-offs are set relative to.

Why These Deadlines Don't Line Up

A natural question is why the terminal and carrier don't simply set one deadline for everything. The answer is that each cut-off is managed by a different process with a different lead-time need: physical container handling at the terminal, documentation processing by the carrier's booking team, and weight verification, which may involve a separate weighing step depending on how the shipper obtains the VGM figure. Bundling these into one deadline would mean whichever process needs the most lead time effectively sets the deadline for the others, which isn't efficient for any of them.

The practical result is that a shipper or forwarder needs to track each cut-off on its own timeline rather than assuming that meeting one means the others are automatically covered. Booking confirmations from the carrier typically list each relevant cut-off separately for exactly this reason.

What Happens If a Cut-Off Is Missed

The consequence of missing a cut-off depends on which one it is, but the general outcome across all of them is the same: the container is rolled to a later vessel. Missing the CY cut-off means the physical box isn't at the terminal in time to be loaded. Missing the VGM cut-off means the container generally can't be loaded even if it's physically present, because the weight requirement is safety-driven rather than negotiable. Missing the SI cut-off is somewhat more flexible in that it doesn't necessarily stop the container from sailing, but it can delay or complicate the bill of lading.

In every case, a roll means a new sailing date, a revised schedule for the buyer or consignee, and in some situations additional charges depending on the carrier's terms. Because the underlying causes of a missed cut-off are usually operational — a late factory completion, a documentation delay, a missed weighing appointment — the fix is generally building enough buffer into the shipment's internal timeline that a small delay upstream doesn't cascade into a missed deadline downstream.

Common Mistakes

A recurring mistake is treating "cut-off" as a single date communicated once, rather than tracking CY, SI, and VGM deadlines separately as the distinct items they are. Another is assuming that meeting the CY cut-off automatically means the shipment is safe, when a missed VGM or SI deadline can still cause a roll or documentation delay on a container that's already sitting at the terminal.

A third common mistake is leaving VGM weighing until the last possible moment, without a buffer for the possibility that the weighing appointment itself gets delayed or that the resulting figure triggers a query from the carrier.

Example

Consider an exporter booking an FCL shipment out of Laem Chabang. The factory finishes packing the container two days before the CY cut-off, giving comfortable buffer for trucking it to the terminal. The forwarder submits shipping instructions well ahead of the SI cut-off, since the shipper provided complete consignee details early.

The VGM figure, however, depends on a certified weighbridge appointment that gets pushed back by a day due to scheduling at the weighing facility. Because the forwarder had built in buffer specifically for the VGM step — treating it as its own deadline rather than assuming it would happen automatically once the container reached the terminal — the revised weighing appointment still lands before the VGM cut-off, and the container makes the intended sailing without needing to roll to the next vessel.