BAF

The Bunker Adjustment Factor (BAF) is a surcharge added to ocean freight rates to compensate carriers for fluctuations in the cost of bunker fuel. BAF is recalculated periodically, typically monthly or quarterly, and varies by trade lane based on the carrier’s fuel-consumption profile and the prevailing fuel price. The 2020 IMO global sulphur cap (limiting bunker sulphur content to 0.5% from 1 January 2020) introduced higher-cost low-sulphur fuel oil (LSFO) and added a Low Sulphur Surcharge (LSS) layer on top of base BAF. Together with the related General Rate Increase (GRI), peak-season surcharges, and port-congestion surcharges, BAF makes the headline freight rate only part of the actual freight cost. This entry also covers GRI, peak-season surcharges, and port-congestion surcharges as related carrier surcharges.

How BAF works

Each major carrier publishes a BAF formula tied to:

The formula produces a BAF rate per TEU per lane, applied as a surcharge on top of the base freight rate. Most carriers publish BAF rates one month in advance, allowing buyers to forecast.

Typical BAF rates (2026)

Rates fluctuate with bunker fuel prices. During fuel-price spikes (2022 saw bunker fuel above USD 1,000/MT), BAF can double from the typical range.

The Low Sulphur Surcharge (LSS)

From 1 January 2020, IMO 2020 requires vessels to use bunker fuel with sulphur content ≤ 0.5% globally (or 0.1% in Emission Control Areas. North Sea, Baltic, North America, Caribbean). The compliance options:

1. Switch to low-sulphur fuel oil (LSFO). ~USD 100-200/MT premium over high-sulphur fuel oil (HSFO).
2. Install a scrubber (exhaust gas cleaning system). Allows continued HSFO use; capex USD 1-3 million per vessel.
3. Use marine gas oil (MGO). Cleaner but expensive (USD 200-400/MT premium over HSFO).
4. Use LNG-fuelled vessels. Limited fleet currently; longer-term solution.

Carriers without scrubbers pass the LSFO premium through to shippers as a Low Sulphur Surcharge (LSS), Environmental Surcharge, or similar named charge. The LSS is typically USD 50-150 per TEU, separate from base BAF, though some carriers consolidate it into a single BAF.

General Rate Increase (GRI)

The GRI is a carrier-announced base-freight rate increase, applied to spot rates rather than contract rates. Carriers announce GRIs typically 30 days in advance and apply them to bookings on a specific lane after the announcement date. GRI patterns:

• Trans-Pacific lanes see GRI announcements roughly monthly during peak season (June-November), each typically USD 300-1,500 per FEU.
• Asia-Europe lanes see less frequent but larger GRIs.
• Intra-Asia lanes rarely use GRI; rates are more market-driven.

For contract-rate buyers, GRIs do not apply during the contract period. For spot-rate buyers, the GRI cycle is a real cash-flow risk that argues for moving to contract.

Peak-season surcharge

A peak-season surcharge (PSS) is an additional surcharge applied during high-demand periods, typically:

• Trans-Pacific: August-October, when retail back-to-school and Christmas inventory ships from Asia
• Asia-Europe: September-November, similar pattern

PSS is announced separately from base BAF and GRI; it stacks on top. Typical PSS is USD 200-1,000 per FEU, applied for 1-3 months at a time.

Port-congestion surcharge

Port-congestion surcharges (PCS) are emergency surcharges applied when specific ports experience extended delays. Examples:

• LA/Long Beach 2021-2022 congestion: carriers applied PCS of USD 500-2,000 per FEU during the worst periods.
• Red Sea / Suez disruption 2023-2024: carriers added re-routing surcharges of USD 1,000-3,000 per FEU for cargo diverted around the Cape of Good Hope.
• Panama Canal drought 2023: carriers added congestion surcharges or routing surcharges.

PCS is typically not in the base contract; it is added as an “operational override” when conditions warrant. Disputed PCS charges have been a frequent FMC complaint topic.

How carrier surcharges catch buyers off guard

Three failure patterns recur:

1. Quote excludes some surcharges. A freight forwarder quotes “USD 1,500 per FEU plus BAF” but does not specify whether GRI, PSS, or PCS apply. The actual invoice can run 30-60% higher than the headline quote.
2. Contract-rate vs spot-rate confusion. A buyer thinks they have a contract rate that is fully fixed but is on a “named-account” rate that excludes GRI. When the carrier announces a GRI, the buyer is exposed.
3. LSS and BAF double-counting. Some carriers consolidate LSS into BAF; others charge separately. Buyer comparing quotes from two carriers may compare different bundling and miss the like-for-like difference.

Practical sourcing notes

For chemical buyers managing freight cost:

• Always quote freight all-in. Get the all-in price including BAF, LSS, GRI (current), PSS (if applicable), PCS (if applicable), origin THC, destination THC, and any DG premiums.
• Track BAF announcements for the carriers you use. The lane-specific BAF rate is published on the carrier’s website or accessible through your freight forwarder.
• Move to contract rates if your annual freight spend on a lane exceeds USD 500,000-1,000,000. Spot-rate exposure to GRI cycles is real.
• Build BAF/GRI/PSS into landed-cost models as separate line items so the impact of carrier changes is visible.

Related terms

Terminal Handling Charges (THC) is the per-container terminal fee, separate from carrier surcharges. Demurrage and Free Time cover post-discharge storage. FOB and CIF Incoterms determine who absorbs the freight surcharges in the contract price.