What is Fuel Surcharge?
A fuel surcharge is a variable charge added to a base freight rate to reflect changes in fuel cost, allowing carriers to keep base rates stable while passing on fuel price movements. In ocean shipping it is usually called the Bunker Adjustment Factor (BAF), often indexed to published bunker prices and adjusted monthly or quarterly; carriers also introduced low sulphur surcharges when the IMO global sulphur limit fell to 0.50 percent on 1 January 2020. Air carriers apply fuel surcharges per kilogram of chargeable weight, while road carriers in North America commonly tie surcharges to the US EIA weekly on-highway diesel price. Many carriers now also apply separate environmental surcharges, for example to recover EU Emissions Trading System costs for shipping. In the US, ocean surcharges must be published in the carrier's tariff, and increases are subject to the FMC's 30-day notice rule.
Why it matters for forwarders
Fuel surcharges can be a large share of total freight cost and move faster than base rates, so a quote without a defined fuel mechanism is incomplete. State whether a quote is all-in or subject to BAF, which index and period apply, and whether the surcharge is fixed at booking, at loading or at invoicing. Contract disputes often arise when a carrier changes its BAF formula or adds new environmental or low sulphur charges mid-contract. Forwarders reselling carrier capacity should pass through surcharges using the same reference and timing as their carrier to avoid margin erosion. For road freight, document the diesel index, base price and per-mile or percentage table in the contract.