Contradictory Results: Reassessing the Impact of Loan-to-Value Restrictions on House Price Inflation

Using Bayesian Structural Time Series analysis, this study examines the causal impact of loan-to-value (LTV) restrictions imposed by the Reserve Bank of New Zealand in October 2013. By incorporating state-space components, such as local linear trend, seasonality and regression, counterfactual values of house price indices are predicted. Surprisingly, the study reveals that the implementation of LTV restrictions had no significant effect on national house price indices, contradicting prior Central Bank studies that reported a nearly 3 percentage-point decrease in housing cost inflation. This contradictory evidence challenges existing perceptions of the effectiveness of LTV restrictions in curbing house price inflation.