Think of Transport Costing as the answer to one question every logistics manager asks: "How much does it cost me to move one tonne of goods one kilometre?" That single figure — the cost per tonne-km — is the heartbeat of this topic.
Transport Costing is a branch of Service (Operating) Costing applied to road, rail, or fleet operations. Instead of a physical product, the 'output' here is the service of movement, so we measure it using composite cost units like passenger-km (for bus/taxi services) or tonne-km (for goods transport). A bus that carries 40 passengers over 200 km has produced 8,000 passenger-km — that's your denominator when computing unit cost.
Costs are grouped into three buckets. Standing charges (fixed costs) exist whether the vehicle moves or not — think vehicle depreciation, insurance, annual road tax, garage rent, and the driver's fixed monthly salary. Running charges (variable costs) vary with distance — fuel, lubricants, tyre wear, and driver's overtime. Maintenance charges are semi-fixed — servicing, repairs, and overhauling costs that depend partly on usage. In the exam cost statement, you'll present all three separately before arriving at total cost and then cost per km or cost per tonne-km.
One concept that trips up nearly everyone: Absolute tonne-km vs Commercial tonne-km. Absolute tonne-km = actual load carried × actual distance. Commercial tonne-km = (actual load + empty-return load, if any) × distance, OR in problems involving multiple trips, it's calculated route by route. In simple fleet problems, ICAI typically asks for the effective/commercial tonne-km to compute realistic unit cost. Always read the question carefully to identify which is asked. This topic is frequently tested as a 8–10 mark cost statement question or a 4-mark unit cost calculation in the CA Inter exam.