Plain definition
Activity-based budgeting estimates the resources and cost needed for the work required to deliver the planned output. Instead of starting with a historical expense line, it begins with demand, identifies the activities that demand creates, and applies the resource rate for each activity.
Illustrative example
Monetary examples use Saudi riyals (SAR). The same principles apply in other currencies.
A fulfilment business expects 4,000 customer orders next month. Each order requires one pick at , one pack at , and one delivery dispatch at . The activity-based budget for these activities is : 4,000 × (2 + 3 + 5).
Sales later revises the demand plan to 5,000 orders. The budget can show the additional workload cost before the operations manager schedules labour and vehicles. If the warehouse is already at capacity, the plan may also require an extra shift; that step cost must be shown separately rather than hidden inside the per-order rate.
| Orders | |
|---|---|
| Pick cost per order | |
| Packing cost | |
| Dispatch cost | |
| Activity cost |
The method is not the same as charging every customer an exact cost. Its planning purpose is to make the link from anticipated work to required resources explicit.
Why it matters
A historical packing-cost line may look stable even when order volume or order complexity is changing quickly. That can leave the business short of people, packaging, or cash. Planning from the activity exposes the operational reason for the cost and lets management test whether price, service level, or capacity should change.
Practical consequence
Choose activities that are material and can be measured reliably, such as orders picked, claims handled, calls answered, or deliveries completed. Derive resource rates from recent operating records and identify which costs are variable, fixed, or added in steps. The activity owner should validate volumes and work standards; finance should test the rates and carry the payment timing into the cash plan. Do not create dozens of weak drivers—the model is useful only when a manager can explain why an activity changes and act on the result.