An extensive literature in Corporate Finance suggests that investors and companies respond to incentives arising from the legal system. In this paper, we show an example in which various Brazilian companies reacted late to Law 9249 of December 1995, with a simple exchange of accounting lines (dividends to interest on capital), reduces the taxable income of the corporation. Documented the average delay in the use of the tax benefit and, through a Discontinuous Regression model, we show that the average delay is related to the low sophistication of legal firms.