Mortgage Co-Signing as a Structural Pathway of Intergenerational Wealth Stratification in Canada

Housing affordability pressures and mortgage qualification rules have increased the importance of parental assistance in determining whether young adults enter homeownership in Canada. Mortgage co-signing is especially consequential because it adds a parent’s income and credit capacity to the application while making the parent legally responsible for the debt. This policy synthesis examines co-signing as a structural mechanism of intergenerational wealth stratification rather than solely as a private family arrangement. It synthesizes Canadian academic literature, official statistics, central-bank research, and mortgage-policy documents and evaluates four responses according to their distributional effects, feasibility, and limitations. The analysis identifies a cumulative pathway: unequal parental wealth produces unequal capacity to co-sign, which creates unequal access to mortgage credit, homeownership, and purchase value and, in turn, unequal opportunities to accumulate housing equity and transfer advantage across generations. The estimated share of mortgages issued to first-time buyers with parental co-signers rose from approximately 4% in 2004 to 11% in 2025, and 74% of co-signed adult children would not have qualified for their existing mortgages independently. The principal beneficiaries are adult children whose parents have sufficient income, credit strength, and financial security to assume mortgage liability. Children of renters, lower-income parents, or highly indebted families are less able to use this route, even when their own financial profiles resemble those of assisted buyers. The paper concludes that co-signing is a structural policy issue because it operates within publicly regulated mortgage and housing systems while distributing access partly according to inherited family capacity. Canada should combine national monitoring of co-signed mortgages with targeted support for first-time buyers who lack family wealth and sustained expansion of affordable market and non-market housing. Together, these measures would improve immediate fairness and reduce long-term dependence on parental balance sheets.
Keywords: parental mortgage co-signing, intergenerational wealth inequality, homeownership access, housing policy, Canada

Economics

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