Ensuring access to postsecondary education (PSE) for all those with the desire to attend and the talent to do so, without regard to family background or other factors over which individuals have no control, is vital to Canada's future economic competitiveness, and is equally important from an equity perspective (i.e., a sense of fairness in terms of individuals' life chances, which are so strongly related to education). This paper exploits the tax-based Longitudinal Administrative Databank (LAD) that has been constructed by Statistics Canada from individuals' tax files to provide new empirical evidence on overall PSE participation rates in Ontario over the last decade, how these rates are related to a number of important individual and family characteristics, including sex, family income, area size of residence and family type, and how some of these relationships have changed over this period while others have remained stable.