This paper examines possible determinants of models of the division of earning and caring activities in Canadian couples. Using the General Social Survey on Time Use, we identify five models of the division of work: complementary-traditional, complementary-gender-reversed, women's double burden, men's double burden, and shared roles. While the complementary-traditional model is declining, it still represents a third of couples. Women's double burden is the second largest category, representing 27 percent of couples in 2005, with men's double burden representing another 11 percent. The shared roles account for about a quarter of couples. Building on these typologies of earning and caring, we analyze the relative importance of life course, as well as structural and cultural factors as determinants of the division of paid and unpaid work within couples. We find that the complementary-traditional and women's double burdens are more likely for older persons, and for persons with young children. Alternative models are more common when women have higher relative resources, for younger persons, and for persons living in Quebec and in urban areas.