Turnover is measured at the fair value of the consideration received or receivable, net of discounts and value added taxes. Turnover includes revenue earned from the rendering of services, reduced for estimated customer rebates and other similar allowances.
Turnover is recognised by reference to the stage of completion of the contract. The stage of completion of a contract is measured by comparing the costs (including time costs) incurred for work performed to date to the total estimated contract costs. Turnover is only recognised to the extent of recoverable expenses when the outcome of a contract cannot be estimated reliably.