Supply Chain Action Points
Read this first — the conclusion, and the moves to make:
- Demand BAF formula transparency in every quote: the reference bunker index, the consumption assumption per TEU and per voyage, and the revision frequency; treat any quote that bundles fuel into an opaque all-in number as a dispute item at audit.
- Model all-in per FEU including BAF at the current 869 dollars per tonne VLSFO level before comparing spot against contract, and re-run the comparison monthly rather than trusting the headline index.
- Run a 90-day invoice audit by lane for stacked surcharges: flag any voyage carrying both a BAF and an emergency bunker surcharge, and recover or renegotiate the duplicated amount at the next billing cycle.
- Set a bunker trigger: if Singapore VLSFO holds above 900 dollars a tonne for two consecutive weeks, open a formal rate review and evaluate Cape-routed alternatives where the transit time allows.
- In Q4 contract negotiations, seek a BAF cap or a fixed fuel component for committed volume, so the bunker exposure stops arriving as a monthly surprise.
Drewry's World Container Index fell 4% to $4,374 per 40ft container in the week to 23 July 2026, the second consecutive weekly decline after the northern-summer peak, with Shanghai-Genoa easing to $5,988 and Shanghai-Rotterdam to $4,824. At the same time Singapore VLSFO climbed from roughly $656 a tonne in early July to about $869 a tonne by the end of the month, a near one-third rise, as Brent crude moved back above $100 a barrel on renewed Strait of Hormuz tensions. Analysts warned on 29 July that a falling headline index does not mean a falling freight bill, because carriers recover fuel through bunker adjustment factors and emergency surcharges rather than base rates, and Cape of Good Hope routings add 10 to 14 days of steaming per voyage.
The Analysis
The World Container Index fell 4% to 4,374 dollars per 40ft container in the week to 23 July, the second consecutive weekly decline after the northern-summer peak. Shanghai to Genoa eased to 5,988 dollars and Shanghai to Rotterdam to 4,824. Read only that, and the natural conclusion is that your freight bill is about to get cheaper.
Over the same month, Singapore VLSFO climbed from roughly 656 dollars a tonne in early July to about 869 dollars a tonne by the end of it, a near one-third rise, as Brent crude moved back above 100 dollars a barrel on renewed Strait of Hormuz tensions. Analysts warned on 29 July that a falling headline index does not mean a falling freight bill, because carriers recover fuel through bunker adjustment factors and emergency surcharges rather than base rates. The index and the invoice are moving in opposite directions, and the gap between them is the whole story.
Below, the pass-through arithmetic that shows the fuel move outweighs the rate cut, why the surcharge sits outside the index by design, and the invoice audit that catches what the headline hides.
Start with the two numbers that moved. The WCI composite fell 4% to 4,374 dollars per FEU; on a 4,374 dollar base, that is a decline of roughly 175 dollars per box week-on-week. Singapore VLSFO rose from about 656 to about 869 dollars a tonne over the same month, a 213 dollar increase, close to a third. Those two facts live in the same market at the same time, and they point in opposite directions. The rate cut is visible, benchmarked and published. The fuel increase is invisible to the index and arrives on your invoice through the surcharge lines.
Now do the pass-through arithmetic, with the assumptions stated openly. Assume a 10,000 TEU vessel burning 60 tonnes a day over a 25-day Asia-Europe voyage: that is 15,000 tonnes of fuel per rotation. A 213 dollar per tonne increase on 15,000 tonnes is about 3.2 million dollars of extra cost per voyage. Spread across 10,000 TEU, a full pass-through is roughly 320 dollars per TEU, or about 640 dollars per FEU. Against that, the 4% base-rate decline is worth about 175 dollars per FEU. In other words, the fuel move outweighs the rate cut by a factor of three or more if carriers recover even most of it. The headline improvement is smaller than the surcharge it hides.
Why the two move independently is the structure of the surcharge. Base rates are the competitive number; BAF and emergency surcharges are the recovery number. When bunker rises, carriers do not raise base rates, because base rates are compared against public indices and against competitors' quotes; they raise the surcharge lines, which are announced per trade with their own effective dates. The renewed Strait of Hormuz tension is the upstream push: Brent back above 100 dollars a barrel pulls bunker up within days, and bunker pulls surcharges up within a billing cycle. The spot rate decline, meanwhile, is the seasonal unwind of the northern-summer peak. Two different clocks, two different lines on your invoice.
Who absorbs this depends on the contract. Shippers on all-in spot quotes see the full pass-through immediately, because the forwarder prices bunker into the quote and revises it per sailing. Shippers on annual contracts with a BAF formula are exposed through the formula, which typically references a bunker index and revises monthly or quarterly; the exposure arrives at the next revision, not at booking. Shippers with fixed all-in contract rates are insulated until renewal, when the carrier prices the higher bunker baseline into the new rate. The SME spot buyer is the worst placed, because every surcharge applies from its effective date with no cap and no negotiating leverage.
Timing is the asymmetry to plan around. Spot base rates adjust weekly and visibly. BAF revisions lag the bunker market, usually by a billing cycle, so a July fuel surge shows up in August and September invoices. Emergency surcharges are worse: they can be announced with days of notice and take effect immediately, which means cargo already on the water can be re-priced. If you are booking September sailings now, the bunker level they will be charged at is largely already known, and it is the 869 dollar level, not the 656 one.
The overlooked point is double-counting risk in the surcharge stack. BAF is meant to recover fuel; emergency surcharges are meant to recover disruption, and on a Cape-routed network the same fuel cost can appear in both. Carriers stacking a BAF and an emergency bunker surcharge on the same voyage is a real pattern, and the only defense is the invoice audit. The second overlooked point: Cape routing feeds the surcharge. The 10 to 14 extra steaming days per voyage are 10 to 14 extra days of fuel at the higher price, so the longer route is not just a transit-time problem, it is a surcharge generator. The corridor question and your bunker bill are the same question.
The counterfactual turns on Hormuz. If the tension eases and Brent retraces toward the 80s, bunker follows within weeks, and the surcharge lines ease with a lag at the next revision; the falling base rate and the falling surcharge would then compound in your favour. If instead the tension becomes an actual disruption, bunker spikes again and emergency surcharges stack on top of an already-elevated BAF, which is the scenario where a 4% index drop becomes meaningless. The condition to watch is not the index; it is the bunker price and the war-risk premium quote on the Gulf, both of which move before the surcharge announcements do.
↑ Back to the key points