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LAD (Longitudinal Administrative Databank)


The Longitudinal Administrative Databank (LAD) is a longitudinal file designed as a research tool on income and demographics. It comprises a 20% sample of the annual T1 Family File (record number 4105) and the Longitudinal Immigration Data Base (record number 5057). Variables have been harmonized where possible and individuals can be linked year to year starting with 1982 data. The file is augmented annually with new data.

The longitudinal file contains many annual demographic variables about the individuals represented and annual income information for both the individual and their census family in that year. For immigrants landed between 1980 and 2014, the file also contains certain key characteristics observed at landing.

The longitudinal nature of the LAD permits custom-tailored research into dynamic phenomena, as well as representative cross-sectional patterns. Data are mainly used by government departments to evaluate programs and support policy recommendations. Academics, private consultants and Statistics Canada researchers also use the data for analyses of socio-economic conditions.

Reference period: The calendar years, 1982 to 2014. Calendar year "y" for income; end of calendar year "y" for age; point in time (usually April of calendar year "y+1") for address information.

Collection period: Income tax returns are filed mainly in the spring following the year of reference. The T1 files for income year "y" are received from Canada Revenue Agency (CRA) in January of the year "y+2".

Publications using this survey

Marchand, S. (2018).  Who benefits from tax-preferred savings accounts?. CEDIA Working Papers No., : La Chaire de recherche Industrielle Alliance sur les enjeux économiques des changements démographiqu. Abstract
Marchand, S. (2018).  Essays in applied microeconometrics with applications to risk-taking and savings decisions. Département d'économique. Québec, QC: Université Laval. Abstract
Leonard, P. S. J., Emery J.. C. Herbert, and J. McDonald T. (2017).  Push or pull into self employment? Evidence from longitudinal Canadian tax data. New Brunswick Institute for Research, Data, and Training Working Paper, Fredericton, NB: University of New Brunswick. Abstract