Consolidation is based on the concept of 'control' and changes in ownership interests while control is maintained are accounted for as transactions between owners as owners in equity.
IAS 27 was reissued in January 2008 and applies to annual periods beginning on or after 1 July 2009, and is superseded by IAS 27 Separate Financial Statements and IFRS 10 Consolidated Financial Statements with effect from annual periods beginning on or after 1 January 2013.
[IAS 27.35] The accounting depends on whether control is retained or lost: Acquiring additional shares in the subsidiary after control was obtained is accounted for as an equity transaction with owners (like acquisition of 'treasury shares'). In the parent's/investor's individual financial statements, investments in subsidiaries, associates, and jointly controlled entities should be accounted for either: [IAS 27.37] The parent/investor shall apply the same accounting for each category of investments.
[IAS 27.26] If it is impracticable a particular subsidiary to prepare its financial statements as of the same date as its parent, adjustments must be made for the effects of significant transactions or events that occur between the dates of the subsidiary's and the parent's financial statements.
[IAS 27.31] Intragroup balances, transactions, income, and expenses should be eliminated in full.
Intragroup losses may indicate that an impairment loss on the related asset should be recognised.
[IAS 27.37] Investments carried at cost should be measured at the lower of their carrying amount and fair value less costs to sell.
The measurement of investments accounted for in accordance with IAS 39 is not changed in such circumstances.