Rolls-Royce provided a trading update today, and covered the impact of IFRS 15 which is probably a lot more important. IFRS 15 is a new accounting standard concerning revenue recognition which will come into use in 2018. It will have a major impact on the figures reported by Rolls-Royce because of their past recognition of revenue and profits from long term maintenance contracts. For example, Rolls-Royce report that when looking at the 2015 accounts the "Changes result in adverse notional adjustments to ...