What is a fuel surcharge in trucking?
A fuel surcharge (FSC) is a separate line item on a freight rate that adjusts the carrier's pay up or down as diesel prices move. It's calculated from a published fuel index (most commonly the DOE/EIA weekly retail diesel price) so neither the shipper nor the carrier is left absorbing fuel volatility.
Almost every truckload rate confirmation breaks pay into two pieces: a linehaul rate (per-mile pay) and a fuel surcharge. The reason is fuel-price volatility — diesel can move 50-80 cents per gallon in a single quarter, and over a 500-mile load that's $80-$130 of margin. Rather than re-negotiate every rate every week, the industry uses a formula tied to a public diesel index. The most common index is the Department of Energy's weekly US On-Highway Diesel Fuel Price, published every Monday. A typical formula: when diesel is at $3.00/gallon (the base), FSC is $0; for every $0.06/gallon above base, FSC adds $0.01/mile. So at $4.20 diesel, FSC = $(4.20-3.00) ÷ 0.06 × 0.01 = $0.20/mile. On a 500-mile load that's $100 of fuel surcharge on top of the linehaul rate. Each broker and shipper publishes their own FSC schedule — some use higher base rates, some adjust by region, some run flat-percentage models. Direct-shipper contracts typically have an FSC matrix attached as an exhibit. The FSC is normally paid to the carrier, not retained by the broker — though some brokers' less-transparent FSC schedules quietly reduce the carrier's share.
- Does the carrier or the broker keep the fuel surcharge?The carrier keeps it. A broker who runs a different FSC schedule with the shipper than with the carrier is technically arbitraging fuel — common practice but a sore point in the carrier community. Transparent brokers pass through the shipper's FSC dollar-for-dollar; opaque brokers may pocket part of the spread. Carriers running direct-shipper freight typically negotiate the FSC schedule as part of the annual contract.
- How is fuel surcharge calculated?Most schedules use the DOE/EIA weekly average national or regional diesel price as the index, with a base price (the diesel price at which FSC = $0) and a step (additional cents-per-mile per fuel-price increment). Common base prices range from $1.20 to $3.00; common steps range from $0.04 to $0.08 per gallon = $0.01 per mile. The FSC updates weekly when the new diesel price publishes, applied to loads picked up the following Monday-Sunday.
- Do all loads have a fuel surcharge?Truckload freight almost always carries an FSC. Many spot-market loads from load boards roll the fuel into a single all-in rate (no separate FSC line), but the carrier should mentally back the fuel out when comparing to FSC-itemized contract loads. LTL freight uses a fuel surcharge structured differently — usually a percentage of the linehaul rate that updates monthly. Intermodal rail moves include a fuel-related rail fuel surcharge that's separate from the drayage carrier's FSC.