In this paper the author discusses how statistics on time use can be integrated into a social accounting matrix representation of economic activity. Time use data are presented as an extended manpower matrix and related to Stone's basic dynamic framework for social statistics. The valuation of time and methods of imputation are then discussed in relation to the choice of production boundary. It is argued that any imputations of labour income must be balanced by valuing goods consumed at their user cost and that there is a case for imputing value to all uses of time.