In this paper, we analyze the impact of the adoption of fair value on the volatility of the results and reserves of Brazilian banks. The sample consisted of 73 banks, which represented, in June 2002, 95.93% of total assets in the national system. We conducted a comparative analysis between the volatilities, with and without the effects of the new regulation, and investigated if there is some symptom of utilization of practices for smoothing the benefits, related to the items of adjustments to fair value. The results of our research revealed that, as opposed to expectations, the new criterion in question has not increased volatility but, on the opposite, has exhibited symptoms of smoothing of benefits. [ABSTRACT FROM AUTHOR] more...