In this analysis, we estimate the dynamic effect of an increase in the high-income tax rate on tax revenues in Quebec. Over the past 10 years, high-income taxes have increased significantly in Quebec, with two successive increases in 2013 and 2016. We use longitudinal microdata from a large sample of taxpayers. The effects obtained from the estimation suggest that increased taxation of high incomes doesn't raise more revenue in the short term to achieve redistributive objectives. The long-run effects are more positive. We also discuss the mechanisms that lead to this dynamic response.