Call-off contract: what it is and how it is priced
A call-off contract is a binding agreement between a buyer and supplier that locks in terms and pricing upfront, with the buyer placing individual orders against it in stages until the total contract value or period is reached.
In short
A call-off contract locks in agreed rates at the start and lets the buyer order in stages throughout the contract period. The supplier's margin depends on applying those rates correctly and tracking how much contract value remains.
A call-off contract is a binding commercial agreement between a buyer and a supplier that fixes the terms, conditions, and agreed rates for a defined scope of goods or services upfront. The customer then places individual orders - "calls off" - against that agreement over time, drawing down from a pre-agreed total value or volume. Unlike a one-off order, which specifies exactly what will be delivered and when, a call-off contract separates the commercial negotiation from the timing of delivery. A B2B supplier uses one when a customer expects to need consistent supply across a project, a programme, or a fixed period - and wants pricing locked in advance without committing to a single large purchase at once.
How a call-off contract is structured
A call-off contract typically sits under a framework agreement, though it can stand alone where a buyer and supplier have agreed terms directly. The contract sets the agreed prices or rate card for each product or service line, the total contract value or volume the buyer can call off, the contract period (commonly 12 months to 4 years), delivery and lead-time expectations for each call-off instruction, and the payment terms that apply to each individual order placed.
What the contract does not specify at the outset is the exact timing or quantity of each individual order. That is determined by the buyer throughout the contract period as their needs emerge. A call-off contract is fulfilled once either the contract period ends or the maximum order value has been drawn down - whichever comes first.
For a B2B supplier, Zigaflow's Contracts feature can hold the master agreement terms while each call-off instruction becomes a separate job or order with its own delivery date and invoice, keeping the relationship between the master value and individual call-offs visible in one place.
How pricing works - and where the margin risk sits
The rates are agreed at the start and held throughout the contract term. That provides predictability: both sides know what a unit of labour, a metre of cable, or a box of printed materials will cost for the duration. But it also means the supplier carries the risk if costs rise between signing and delivery.
Three pricing variables need careful tracking across the life of a call-off contract.
Agreed unit rates. The price per item, hour, or unit set in the contract. These must be applied correctly to each call-off order, regardless of how much time has passed since the contract was signed. A supplier who quotes from memory rather than from the locked rate card risks applying the wrong figure. Zigaflow's customer pricing feature lets agreed rates be stored against each customer account so that every call-off order picks them up automatically, rather than relying on whoever is building the order that day.
Remaining contract value. The total value committed in the contract minus what has been called off so far. Tracking this figure matters because a contract with £80,000 remaining is a sales asset that should be protected; one that is nearly exhausted is a commercial conversation about renewal. Suppliers who do not track drawdown against the master value often discover late that a contract has run out - at the moment the customer expects to place another order.
Escalation provisions. Some call-off contracts include a clause allowing prices to adjust annually in line with a published index (often CPI or a sector-specific material cost index). Where such a clause exists, the supplier must apply it correctly and at the right time. Missing an escalation window leaves money on the table; applying it incorrectly risks a dispute.
Drawdown and remaining value
At any point during a call-off contract, "drawdown" is the cumulative value of orders placed to date. "Remaining value" is the total contract value minus drawdown. Both figures should be visible against the master agreement record, not buried in a spreadsheet or reconstructed from invoices after the fact.
The operational discipline of a call-off contract is therefore less about winning the negotiation at the start and more about what happens next: applying the right rates to every order, knowing how much value remains, and acting before the contract runs out.
Call-off contract vs. related contract types
Call-off contracts are frequently confused with adjacent terms.
A blanket purchase order is a purchasing instrument raised internally by the buyer to authorize ongoing purchases from a supplier up to a set limit. A call-off contract is the broader, legally binding agreement that governs the terms - the blanket purchase order is one mechanism for exercising call-offs under it.
A framework agreement establishes overarching rules: which suppliers are approved, what categories of spend they cover, and how call-offs will be awarded. It does not, by itself, commit the buyer to spend anything. The call-off contract is what creates the actual purchase obligation.
For suppliers preparing a quote in response to a call-off instruction, the job is not to re-negotiate price - that is already settled. The job is to confirm the correct agreed rate, specify the exact quantity and delivery terms for this instruction, and ensure the order is traceable to the master contract so that drawdown is recorded accurately.