What Is the Underused Housing Tax (UHT)? The Underused Housing Tax (UHT) is a federal tax introduced by the Government of Canada. Its purpose is to discourage the ownership of underused or vacant residential properties. The tax is generally 1% of the property’s value per year . It mainly applies to certain owners of Canadian residential real estate. However, UHT is often misunderstood . Many people think it only affects foreign owners or vacant homes. This is not entirely tr