Tax expense (tax income) is the aggregate amount included in the determination of profit or loss for the period in respect of current tax and deferred tax. Tax expense (tax income) comprises current tax expense (current tax income) and deferred tax expense (deferred tax income).
Tax expense (tax income) is specifically discussed in IAS 12 Income Taxes.
Source: Glossary of Terms of IFRSs as at 31 December 2008.