Low Sulphur Surcharge (LSS) and Emergency Bunker Surcharge (EBS): The Fuel Charges Behind Your Sea Freight Quote

Open a sea freight invoice from any carrier and, next to the ocean freight line, you will usually find two more charges that have nothing to do with the size of your container or the distance it travels: the Low Sulphur Surcharge (LSS) and, in some quarters, an Emergency Bunker Surcharge (EBS). Both are fuel-related, both are set unilaterally by the shipping line, and both can move your landed cost by a meaningful margin without a single thing changing about your cargo.

Why a ship’s fuel bill ends up on your invoice

A container ship the size of the vessels calling at Chattogram or transshipping through Colombo and Singapore burns marine fuel by the tonne, not the litre. Bunker fuel is priced globally in US dollars per tonne and moves with crude oil markets, refinery output and, since 2020, with a specific regulatory constraint on what kind of fuel a ship is even allowed to burn. Because fuel is the single largest variable cost in operating a vessel, carriers do not absorb price swings into their base freight rate — they publish a separate, adjustable surcharge that moves independently of the rate you negotiated for the quarter or the year.

What IMO 2020 actually changed

The Low Sulphur Surcharge exists because of a specific rule: MARPOL Annex VI, enforced by the International Maritime Organization from 1 January 2020, cut the global sulphur limit in marine fuel from 3.50% mass by mass down to 0.50% m/m, with an even tighter 0.10% limit inside designated Emission Control Areas near parts of Europe and North America. Before 2020, ships mostly burned heavy fuel oil (HFO), which is cheap because it is essentially a refinery by-product. To comply, operators either switch to very low sulphur fuel oil (VLSFO), which costs more to refine, or install an exhaust gas scrubber that lets them keep burning HFO while cleaning the exhaust. Either path adds real cost per voyage, and LSS is the carrier’s mechanism for recovering it from cargo owners rather than absorbing it into the base rate.

LSS, BAF/CAF and EBS: three different levers

It helps to keep these separate because carriers sometimes bill more than one on the same shipment. The Bunker Adjustment Factor (BAF) and Currency Adjustment Factor (CAF) are the older, broader mechanisms that track general fuel price and exchange rate movement against a reference baseline — we cover how those work in our guide to BAF and CAF surcharges. LSS is narrower: it is specifically tied to the cost gap between compliant low-sulphur fuel and the legacy high-sulphur fuel, and many carriers publish it as a flat per-container or per-tonne figure rather than a formula. An Emergency Bunker Surcharge, or EBS, is different again — it is an ad hoc charge that carriers or their conferences introduce mid-quarter when bunker prices spike faster than their published BAF/LSS schedule can react, often during geopolitical shocks to oil markets. Not every carrier uses the EBS label; some fold the same idea into a revised BAF instead.

How the numbers actually get set

Carriers typically publish LSS as a fixed amount per TEU or per FEU on a given trade lane, reviewed and reissued every one to three months depending on the line and the route. It is not usually negotiable the way base freight is, because it is presented as a pass-through of a real, verifiable regulatory cost rather than a profit margin. That said, the amount varies noticeably between carriers on the same China–Bangladesh lane, because it depends on each line’s fleet mix — a carrier with more scrubber-fitted vessels on a given route has a smaller compliance cost gap to recover than one running an all-VLSFO fleet, and that difference does show up in the surcharge sheet if you compare quotes side by side.

Why this catches importers off guard

The most common mistake we see is an importer comparing two forwarder quotes on ocean freight alone and picking the cheaper one, only to find the total invoice converges once LSS, BAF and THC are added back in. Because LSS is billed separately and reviewed on its own schedule, a quote that looked fixed for the quarter can still move if the carrier revises its LSS mid-cycle in response to a bunker price jump — this is exactly the kind of clause worth checking in your booking confirmation, since some carriers reserve the right to apply the LSS rate in effect at the time of vessel departure rather than the rate in effect when you booked. A second mistake is assuming LSS is refundable or negotiable like a detention fee; because it is framed as a regulatory pass-through, most carriers treat it as non-negotiable even when clients push back.

What this means for your landed cost planning

For an importer working out total cost per shipment, the honest approach is to treat LSS the way you treat BAF: as a variable that needs a fresh check at booking time rather than a number you can lock in from a shipment three months ago. Bunker prices and the resulting LSS schedules move with global oil markets that no forwarder or importer in Bangladesh controls, so we will not quote you a fixed LSS figure here — ask us for the current published rate on your specific lane and container type when you are ready to book, and we will pull the carrier’s live surcharge sheet rather than estimate. The same applies to whether your shipment is likely to see an EBS layered on top; that only happens during active bunker price spikes, and it is not something that can be predicted months in advance.

Working with a forwarder who tracks this for you

Because LSS and EBS both sit outside the base freight negotiation, the practical protection for an importer is documentation, not negotiation: get the surcharge breakdown in writing at booking, and confirm whether the rate quoted is fixed through the sailing date or subject to revision. This is one of the recurring line items we walk clients through as part of our door-to-door and sea freight service, because a shipment quoted without a clear LSS figure is not really a complete quote — it is a base rate with an unknown attached. If you are comparing quotes from multiple forwarders for the same China-to-Chattogram lane, ask each one to itemise LSS and BAF separately rather than folding them into an all-in figure, since that is the only way to see whether the difference in total price comes from genuine service quality or simply a more optimistic surcharge estimate.

Getting an accurate number for your shipment

If you are budgeting for an upcoming order and want to know what LSS will actually add to your per-container cost, contact our team with your expected shipping month, port pair and container type, and we will pull the current carrier surcharge sheet rather than quote from memory. For businesses that import regularly enough to feel these fluctuations across a full year, it is also worth reviewing your total logistics spend through our sourcing and shipping service, where fuel surcharges are one of several variable costs we track on your behalf so they do not arrive as a surprise on the final invoice.

A quick way to sanity-check a quote

Before accepting a sea freight quote, ask the forwarder to itemise ocean freight, LSS, BAF and THC as separate lines rather than a single all-in figure. If a quote only shows one bundled number, you cannot tell whether it is genuinely cheaper or whether the forwarder has simply under-estimated the surcharge portion and will revise the invoice upward once the carrier confirms its published LSS for your sailing week. This is a five-minute check that avoids the most common source of disputed invoices we see between importers and forwarders on China–Bangladesh sea freight bookings.