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Home mortgage interest deduction

Tax deduction on mortgage interest

  • 9 min read
  • 2 chapters

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Through Interest (economics), Loan and Switzerland

Most economists believe mortgage interest deduction is bad policy and is counterproductive. They note that it increases inequality, is an unnecessary market distortion, and contributes to housing unaffordability.

Most developed countries do not allow a deduction for interest on personal loans, but the Netherlands, Switzerland, the United States, Belgium, Denmark, and Ireland allow some form of the deduction.

Effectiveness

The Mortgage Interest Deduction (MID) is a widely used policy intended to promote homeownership. However, several studies suggest that its effect on homeownership rates is limited or even negative.

Glaeser and Shapiro (2003) point out that the deduction mainly benefits higher-income households, who are typically homeowners regardless of the subsidy. Empirical research by Hanson (2012) confirms that the MID does not increase homeownership but instead leads to the purchase of larger and more expensive homes.

In housing markets with inelastic supply, the value of the MID is often capitalized into higher house prices, increasing the financial barriers to entry. According to Hilber and Turner (2014), the MID can even reduce homeownership in such markets by raising down payment requirements and future mortgage costs. Only in areas with lax land-use regulations does the MID appear to modestly promote homeownership among middle- and higher-income households.

Simulations by Sommer and Sullivan (2018) suggest that eliminating the MID would lower house prices, reduce household mortgage debt, slightly increase homeownership, and improve overall welfare. Blouri et al. (2021) also find that repealing the MID has a small negative impact on ownership rates but a positive effect on welfare overall.

Similar findings have been reported in Europe. A quasi-natural experiment in Denmark (Gruber et al., 2022) found no effect of the MID on homeownership among middle- and higher-income households, but did observe increases in home size and household debt.

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