This paper contributes to the analysis of female labour supply by acco
unting for both child care costs and differences in part-time and full
-time work. An ordered probit model is used to examine the impact of c
hild care costs on the work status of married mothers. Data are drawn
from the Canadian National Child Care Survey and the Labour Market Act
ivity Survey. The results from this paper show the degree to which chi
ld care subsidies may have differential impacts on part-time and full-
time work decisions by mothers: the child care cost elasticities for p
art-time and full-time employment are reported to be -0.21 and -0.71,
respectively.