YIT has applied the IFRIC 15 IFRS interpretation as of the financial period starting January 1, 2010. The Group's financial performance is presented with both figures compliant with Group-level reporting and figures compliant with segment-level reporting, referred to as the segments' total figure. The difference between the accounting policies is reported as an IFRIC 15 adjustment. The figures for 2010 and 2009 are comparable.
The merger of YIT and Lemminkäinen took effect on February 1, 2018. Going forward, YIT will report in accordance with IFRS principles in its Group reporting as well as its segment reporting.
The effective date of IFRS 15 Revenue from Contracts with Customers is a financial period beginning on or after 1 January 2018. IFRS 15 specifies how and when to recognise revenue from contracts with customers.