## Contract Costs – Inclusions and Exclusions
Contract costs comprise three categories:
### Category 1: Costs That Relate DIRECTLY to the Specific Contract
- Site labour costs (including site supervision)
- Cost of materials used in construction
- Depreciation of plant and equipment actually used on the contract
- Cost of transportation to/from the contract site
- Cost of hiring plant and equipment
- Cost of design and technical assistance directly related to the contract
### Category 2: Costs ATTRIBUTABLE to General Contract Activity (Allocable)
- Insurance premiums
- General construction overhead (allocated systematically across contracts)
- Borrowing costs where AS 16 capitalisation criteria are met
### Category 3: Costs SPECIFICALLY CHARGEABLE to the Customer
Costs explicitly agreed in the contract to be charged to the customer (e.g., general admin costs where the contract provides for reimbursement)
### Costs EXCLUDED from Contract Costs
| Excluded Item | Reason |
|---|---|
| General admin overheads (non-reimbursable) | Not attributable to any specific contract |
| Selling costs | Period cost, not contract cost |
| Depreciation of idle plant (not used on construction) | Not related to contract activity |
| R&D costs | Period cost |
### The Idle Plant Trap
Only the depreciation of plant actually deployed on the contract is includable. Depreciation of plant sitting idle on the contractor's premises is a period cost — excluded.