--- title: "Freight Fuel Surcharge Explained: Road, Air and Sea (2026)" description: "How freight fuel surcharges work by road, air and sea: CNR index, FSC, BAF, 2026 price pressures and what shippers should check on contracts and invoices." image: https://www.thematrans.com/hubfs/Carrefour%20logistique%20entre%20terre%2c%20mer%20et%20ciel.png --- [+33158020321](tel:+33158020321) [Réservez une consultation gratuite](https://services.thematrans.com/meetings/marina-weber?hsLang=en) [![Thema Trans](https://146010966.fs1.hubspotusercontent-eu1.net/hubfs/146010966/identit%C3%A9%20de%20marque/logo-thema-trans.png)](https://www.thematrans.com/?hsLang=en) [Notre Cabinet](https://www.thematrans.com/a-propos?hsLang=en) [Nos Expertises](https://www.thematrans.com/nos-missions?hsLang=en) [Actualités](https://www.thematrans.com/actualites?hsLang=en) [Contact](https://www.thematrans.com/contact?hsLang=en) ![en](https://www.thematrans.com/hubfs/raw_assets/public/Thema_Trans_Theme/images/flags/en.png) - [Français ![fr](https://www.thematrans.com/hubfs/raw_assets/public/Thema_Trans_Theme/images/flags/fr.png)](https://www.thematrans.com/blog/surcharge-fuel-transport-air-route-mer-fonctionnement-et-impact-sur-votre-budget) - [English ![en](https://www.thematrans.com/hubfs/raw_assets/public/Thema_Trans_Theme/images/flags/en.png)](https://www.thematrans.com/en/blog/freight-fuel-surcharge-road-air-sea) # Surcharge fuel transport : air, route, mer, fonctionnement et impact sur votre budget ![Freight fuel surcharge: truck and container ship at a port terminal](https://www.thematrans.com/hs-fs/hubfs/Carrefour%20logistique%20entre%20terre%2c%20mer%20et%20ciel.png?width=1170&height=622&name=Carrefour%20logistique%20entre%20terre%2c%20mer%20et%20ciel.png) > ***Executive summary:** A freight fuel surcharge is an indexation mechanism that automatically passes changes in fuel prices through to the cost of transport. It is calculated differently for road, air and sea freight. In 2026, geopolitical tensions, particularly around the Strait of Hormuz and the Red Sea, are putting sustained upward pressure on this cost item.* ---   Along with labour, fuel is a carrier's largest cost. Any rise in oil prices feeds through to transport invoices, whichever mode is used.   The **fuel surcharge** is the contractual and, in some countries, legal mechanism that organises this pass-through. It does not work the same way when you ship by road, air or sea, and in 2026 the global geopolitical context is amplifying trends that deserve close attention.   This article gives a complete overview: where the mechanism comes from, how it works for each mode, recent trends and the operational impact for shippers.     --- ## Road freight fuel surcharge: a regulated mechanism indexed to the CNR **The road freight fuel surcharge is the most tightly regulated of the three, particularly in France.**   In France, the law of 5 January 2006 governs this indexation mechanism, which requires shippers to bear fluctuations in diesel prices in order to protect carriers' economic balance. Under the French Transport Code, the agreed transport price is revised automatically according to the change in fuel cost between the contract date and the date of transport.   The CNR professional diesel index measures the monthly change in the actual cost of diesel for heavy goods vehicles of 7.5 tonnes and over. It is published by the Comité National Routier (CNR), the French national road transport committee, and serves as the legal reference for the indexation mechanism set out in Articles L3222-1 and L3222-2 of the Transport Code. In March 2026, as prices surged, the CNR also began publishing fortnightly diesel indices.   **The revision mechanism relies on a reference index.** Starting from a contractual base, the surcharge rate moves up or down in line with the chosen index. In each contract, it is therefore essential to check the reference used, the share of energy costs applied and the frequency of revision.   **Key takeaway:** in road freight, the surcharge works in both directions. If fuel goes up, the invoice increases; if it goes down, the invoice must also be revised downwards, subject to the applicable clauses.   **Observed trend:** the share of diesel in the cost of long-distance transport has changed significantly, from 26.5% in 2023 to 24.4% in 2024, 22.1% in 2025 and 20.9% in 2026. This lower weighting notably reflects more moderate fuel prices over that period. However, the CNR index stood at 181.52 in December 2025 and reached 242.15 in July 2026, a significant rebound linked to geopolitical tensions in the first half of 2026.     ![Chart of the CNR professional diesel index in France from 2016 to 2026](https://www.thematrans.com/hs-fs/hubfs/indice_cnr_gazole_2016_2026.png?width=3200&height=1440&name=indice_cnr_gazole_2016_2026.png) *Source: Comité National Routier (CNR), professional diesel index, 2016–2026.*     --- ## Air freight fuel surcharge: the FSC, a more flexible mechanism set by airlines **In air freight, the fuel surcharge is known as the FSC, and it works in a fundamentally different way from road freight.**   The FSC is based on the price of jet fuel, for which the International Air Transport Association (IATA) publishes reference data. Each airline remains free to set its own surcharge. The calculation multiplies the shipment's chargeable weight (the billable weight, which takes both actual weight and volume into account) by a per-kilogram rate indexed to jet fuel. Airlines adjust these rates weekly or every two weeks according to the price of jet fuel and benchmarks such as IATA's Jet Fuel Price Monitor.   According to IATA, airlines' total fuel bill, projected at $291 billion in 2024, represents 31% of all operating costs.   **How long has this mechanism existed?** Airlines introduced air fuel surcharges on a large scale during the oil price shocks of the 2000s, notably after the 2004–2005 peak, and they have been a structural component of air freight invoicing ever since.   **2025–2026 trend:** geopolitical tensions have led many airlines to raise their FSCs. Surcharge levels nevertheless vary considerably between airlines and routes, and no universal range can be given without attributing it to a specific primary source. What is documented is that airlines such as Japan Airlines substantially increased their international surcharges in mid-2025 and early 2026.     --- ## Sea freight fuel surcharge: the BAF, a per-container mechanism highly exposed to geopolitics **In sea freight, the fuel surcharge is called the BAF, or Bunker Adjustment Factor, and it is calculated per container (TEU, the standard 20-foot container unit).**   The BAF is a tariff supplement applied by shipping lines to offset changes in fuel prices. Reference indices used in shipping notably include Platts, for the price of heavy fuel oil (HFO) and very low sulphur fuel oil (VLSFO). Revision mechanisms vary between shipping lines: some revise monthly, others quarterly, and contract terms may include caps or trigger thresholds. Companies should therefore read the BAF clauses in their contracts carefully to understand how often, and according to which index, the surcharge is revised.   **A major geopolitical point of attention: Hormuz and the Red Sea are not the same disruption.** Two separate phenomena need to be distinguished: - Disruptions in the **Red Sea** (Bab el-Mandeb Strait), which from late 2023 and through 2024 led major shipping lines to divert around the Cape of Good Hope, lengthening voyages and generating specific surcharges. - Tensions around the **Strait of Hormuz**, which concern oil flows from the Persian Gulf and escalated separately in 2026, with a direct impact on oil prices and, as a result, on BAFs across all global shipping routes. These two phenomena are combining in 2026, pushing up freight rates and, mechanically, the BAFs charged to shippers. According to the U.S. Energy Information Administration (EIA), flows through the Strait of Hormuz in 2024 made up more than one-quarter of global seaborne oil trade and about one-fifth of global oil consumption, so any disruption to this corridor affects energy prices worldwide. See also our analysis of [disrupted sea freight and pressure on Hormuz](https://www.thematrans.com/en/blog/maritime-perturb%C3%A9-ormuz-sous-contrainte-a%C3%A9rien-sous-pression?hsLang=en).     --- ## 2026: the cumulative effect of crises on your fuel surcharges   **Not since the 2020–2022 pandemic have companies had to manage so many variables at once on their transport fuel costs.**   In 2026, several factors are combining to sustain high volatility in fuel costs: - **persistent volatility in oil markets**, which then spreads to diesel, jet fuel and bunker fuel; - **tensions in the Red Sea**, which lengthen certain shipping routes and increase operating costs; - **tensions around the Strait of Hormuz**, a strategic energy corridor for global oil flows; - **differences in diesel prices across Europe**, linked in particular to taxation, supply costs and market conditions specific to each country. For companies, the consequence is clear: budget visibility remains limited. A one-off fall in fuel prices is not enough to offset previous increases, especially when several surcharges are stacked on top of each other.   These differences highlight an essential point: **surcharges cannot be compared directly from one mode to another, one provider to another, or even one country to another**. They are based on different indices, revision frequencies and calculation bases. A high percentage does not necessarily mean a higher overall cost if it does not apply to the same base.     ![Comparison of road diesel prices by European country, October 2026](https://www.thematrans.com/hs-fs/hubfs/prix_gazole_routier_par_pays_drapeaux.png?width=3200&height=1440&name=prix_gazole_routier_par_pays_drapeaux.png) *Source: European Commission, Weekly Oil Bulletin, as of 12 October 2026.*     --- ## FAQ: fuel surcharges and freight transport   **Q: Is a fuel surcharge mandatory in all road transport contracts?** A: In France, automatic revision for energy costs applies to road freight under the Transport Code (Articles L3222-1 and L3222-2). The surcharge must appear as a separate line at the bottom of the invoice, distinct from the base transport price. The Code also provides for contractual revision terms: the parties may agree on an index or method other than the CNR index, provided the pass-through principle is respected.   **Q: Why do surcharge rates differ so much between road, air and sea?** A: Because each mode relies on different fuels, different cost structures and different calculation bases. An air FSC rate cannot be compared directly with a road surcharge rate or a sea BAF.   **Q: How do tensions around Hormuz and the Red Sea affect the sea freight fuel surcharge?** A: The two disruptions work differently but have converging effects. Red Sea diversions lengthen distances and increase fuel consumption per voyage. Tensions around Hormuz weigh on oil prices worldwide, raising bunker costs for all shipping lines. The BAF charged to shippers reflects both pressures, and specific surcharges (war risk, emergency fuel) may be added. It is essential to check the contractual basis of each surcharge invoiced.   **Q: Is the fuel surcharge symmetrical? Does it also go down when fuel prices fall?** A: The mechanism is symmetrical: it applies to both increases and decreases. In road freight, a formula indexed to the CNR automatically produces a reduction if the index falls below the contractual reference index. In practice, companies need to make sure their carriers also apply decreases, which freight invoice auditing makes it possible to verify.   **Q: How can I anticipate the impact of fuel surcharges on my transport budget?** A: The first step is to map your flows by transport mode and identify the share of fuel surcharge in each contract. Then compare revision terms between providers and put regular checks in place on the surcharges applied to your invoices.     --- ## **Conclusion: manage the fuel surcharge as a risk to costs, lead times and margins**   The fuel surcharge has become a structural part of transport costs. It is neither a minor add-on nor an item that can be left unchecked. In 2026, energy market volatility, geopolitical tensions and differences in fuel prices across Europe confirm that it must be actively managed.   For companies, there are three priorities: **securing budgets, limiting invoicing discrepancies and informing logistics decisions**. This means tracking the right indices, understanding the rules specific to each mode and reviewing contracts carefully. In practice, the most effective levers remain clarifying clauses, regularly comparing rate scales and systematically auditing transport invoices.   In other words, controlling the fuel surcharge means better controlling your transport costs, and also strengthening your ability to anticipate risks and protect your margins in a persistently unstable environment.     --- ## **Sources** - [French Transport Code: provisions on road freight transport prices (Légifrance)](https://www.legifrance.gouv.fr/codes/section_lc/LEGITEXT000023086525/LEGISCTA000023070443/) - [Comité National Routier (CNR): road transport indices](https://www.cnr.fr/indices-routiers-comite-national-routier) - [Comité National Routier (CNR): 2026 diesel weightings](https://www.cnr.fr/actualites/pond%C3%A9rations-gazole-2026) - [IATA: Jet Fuel Price Monitor](https://www.iata.org/en/publications/economics/fuel-monitor/) - [IATA: 2024 airline industry financial outlook](https://www.iata.org/en/pressroom/2024-releases/2024-06-03-01/) - [International Maritime Organization (IMO): Sulphur 2020](https://www.imo.org/en/MediaCentre/HotTopics/Pages/Sulphur-2020.aspx) - [U.S. Energy Information Administration (EIA): the Strait of Hormuz remains a critical oil chokepoint](https://www.eia.gov/todayinenergy/detail.php?id=65504) - [European Commission: Weekly Oil Bulletin](https://energy.ec.europa.eu/data-and-analysis/weekly-oil-bulletin_en) 10 novembre 2026 Marina Weber       ![Transport multimodal : porte-conteneurs, camions et entrepôt logistique](https://www.thematrans.com/hs-fs/hubfs/Photos%20du%20site/banniere-gestion-et-optimisation-transport-logistique-douane.jpg?width=1880&height=940&name=banniere-gestion-et-optimisation-transport-logistique-douane.jpg) NOUS CONTACTER Parlons de vos flux Cabinet indépendant depuis 1997, nous accompagnons les PME et ETI sur l’optimisation de leurs coûts de transport, leurs appels d’offres et leurs opérations douanières. ![icon](https://146010966.fs1.hubspotusercontent-eu1.net/hubfs/146010966/raw_assets/public/Thema_Trans_Theme/images/icons/clock.png) Horaires Du Lundi au jeudi : 9h00-12h30 / 14h00-17h45 Vendredi : 9h00-12h30 / 14h00-16h30 ![icon](https://146010966.fs1.hubspotusercontent-eu1.net/hubfs/146010966/raw_assets/public/Thema_Trans_Theme/images/icons/phone.png) Horaires Du Lundi au jeudi : 9h00-12h30 / 14h00-17h45 Vendredi : 9h00-12h30 / 14h00-16h30 ![icon](https://146010966.fs1.hubspotusercontent-eu1.net/hubfs/146010966/raw_assets/public/Thema_Trans_Theme/images/icons/email.png) Horaires Du Lundi au jeudi : 9h00-12h30 / 14h00-17h45 Vendredi : 9h00-12h30 / 14h00-16h30 ![icon](https://146010966.fs1.hubspotusercontent-eu1.net/hubfs/146010966/raw_assets/public/Thema_Trans_Theme/images/icons/location.png) Horaires Du Lundi au jeudi : 9h00-12h30 / 14h00-17h45 Vendredi : 9h00-12h30 / 14h00-16h30 [![Thema Trans](https://www.thematrans.com/hs-fs/hubfs/logo-thema-trans.png?width=280&height=46&name=logo-thema-trans.png "Thema Trans")](https://www.thematrans.com?hsLang=en) Optimisation of transport, logistics and customs procedures. 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