The Financial Accounting Standards Board (FASB) eliminated goodwill amortisation from 2002 and the International Accounting Standards Board (IASB) followed in 2005. Before that, goodwill, the capitalised value of the excess of purchase price over fair value of identifiable assets, required an annual charge to earnings for up to 40 years until the value of goodwill was eliminated. (Warren Buffett’s essay, “Goodwill and its Amortisation: The Rules and The Realities” in the appendix to his 1983 chairman’s letter, is an excellent discussion of goodwill amortisation). Since those accounting changes, goodwill is now subjected to impairment testing, which, unlike goodwill amortisation, is a real economic cost to the firm. Following “Core Earnings: New Data and Evidence” by Ethan Rouen, Eric So, and Charles C.Y. Wang, for years before the rule change, I add the goodwill amortisation charge to net income and for years after the rule change, the goodwill impairment charge, so as to arrive at a better measure of net operating profit after tax (NOPAT).
Effective 2005, the IASB required employee stock options (ESO) to be expensed in the income statement, with the FASB following a year later. Until then, firms could treat ESO compensation as if it was not a cost, inflating their reported earnings. Consequently, for the era before this accounting change, one must dig up data from the footnotes in order to calculate the cost of ESO issuances and ensure that results are comparable across periods and add the charge to net income so as to arrive at a better measure of NOPAT.