Taxes and Stock Return Seasonality: Evidence from the London Stock Exchange
Prior to the introduction of capital-gains taxes, seasonality is not detected in the returns of firms that traded on the London Stock Exchange. However, after the imposition of a capital-gains tax, the British stock return data exhibit apparent monthly effects in both Jan uary and April. Additional analysis reveals that, while the April effect is consistent with the tax-loss-selling hypothesis, the January effect cannot be attributed solely to the introduction of capital-gains taxation. Furthermore, the authors efforts indicate that much caution should be exercised when interpreting studies that compare results from non-U.S. data sources with those from U.S. data. Copyright 1987 by the University of Chicago.