Underused Housing Tax - Underused Housing Tax - Canada.ca The Underused Housing Tax is an annual 1% tax on the ownership of vacant or underused housing in Canada that took effect on January 1, 2022. The tax usually applies to non-resident, non-Canadian owners. In some situations, however, it also applies to Canadian owners. This is a summary of some of the most important information about the Underused Housing Tax. More information and details about the tax will be available over the…