It is an imputed rent tax[1], which is in addition to property taxes. A property owner renting out a property would pay both property tax and then income tax on rent collected. This tax reflects that for owner-occupants.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Imputed_rent" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Imputed_rent</a>