An index-linked clause pegs contract price adjustments to a public benchmark such as steel, Brent crude, or CPI, so the parties share input-cost movement automatically. It is the mechanism that keeps a multi-year contract solvent when raw-material prices swing.
How index-linked clauses work
A steel distributor signs a three-year supply framework with a construction customer. Rather than lock a fixed price, both sides agree the invoice price will move with the London Metal Exchange steel index, reset each quarter. When steel jumps sharply in a single quarter, the invoice moves with it and neither side absorbs the shock alone.
The clause names the reference index, the reset frequency, the formula linking index to invoice price, and the floor or cap that limits extreme moves. Common benchmarks are commodity indices for materials, Brent crude for energy-linked freight, and CPI for services and long-term rental contracts.
Where index-linked clauses appear in contracts
Index-linked clauses live inside the pricing schedule of supply, service, freight and lease agreements. They sit alongside fuel surcharge rules, which handle diesel and jet-fuel movement, and interact directly with gross margin because each adjustment reprices the delivered cost. Framework agreements in commodities, chemicals, packaging, transport and long-term real estate carry index clauses as standard. When the reference index is missing, ambiguous, or drifts away from the party's true cost basis, the clause becomes a source of dispute rather than a shared risk buffer.
Index-linked clause FAQ
Is an index-linked clause the same as a price adjustment clause?
Not exactly. An index-linked clause is one specific form of price adjustment where the change is driven by a named public benchmark, rather than by negotiation or supplier notice.
Which indices are used most?
LME for metals, Brent for energy, ICIS or Platts for chemicals, and CPI or HICP for inflation-linked services.
Can an index-linked clause be capped?
Yes. Caps, floors and collars are standard drafting tools that stop extreme index movement from destroying either side's economics.
