The tax currently payable is based on taxable profit for the year. Taxable profit differs from profit as reported in the profit and loss account because of expenses that are disallowed for taxation purposes. The company's liability for current tax is calculated using tax rates that have been enacted or substantively enacted by the end of the reporting period.
Deferred tax is recognised on timing differences between the carrying amounts of assets in the financial statements and the corresponding tax bases used in the computation of taxable profit. Deferred tax assets and liabilities are measured at the tax rates that are expected to apply in the period in which the assets are realised, based on tax rates (and tax laws) that have been enacted or substantively enacted by the end of the reporting period. Deferred tax liabilities are presented within provisions for liabilities.