This excerpt taken from the NYX 10-K filed May 1, 2007.
In September 2006, the Securities and Exchange Commission issued Staff Accounting Bulletin No. 108, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current year Financial Statements (SAB 108), which provides interpretive guidance on how the effects of the carryover or reversal of prior year misstatements should be considered in quantifying a current year misstatement. The guidance is effective for fiscal years ending after November 15, 2006 and it allows a one-time transitional cumulative effect adjustment to beginning-of-year retained earnings for errors that were not previously deemed material, but are material under the guidance in SAB 108.
Prior to 2006, NYSE relied on license holders (former members) to self-report transaction volume and remit payment for the related transaction fees on a one-month lag. Starting in December 2006, NYSE Group commenced billing license holders for trading activity brought to the floor of the NYSE. As a result, NYSE Group eliminated the one-month lag in recognizing NYSE related transaction revenues. However, instead of recording both the self-reported November transaction fees and the accrued December transaction fees in the December 2006 results of operations (which would have resulted in reporting thirteen months of transaction fee revenue in fiscal 2006), NYSE Group elected to increase its January 1, 2006 retained earnings by approximately $6.6 million, which corresponds to the impact of the thirteenth month of transaction fee revenues, net of related income taxes.