“Taxes are one of the biggest expenses associated with owning property,” said Raymond Williams, vice-chair for the Ontario chapter of the Canadian Property Tax Association. Watch for property assessment errorsWilliams said every homeowner should periodically check their property taxes for any factual errors, such as the wrong lot size that their home was assessed on, or surprise tax increases. “If suddenly there’s a large jump in your taxes, chances are something changed on the assessment,” Williams said. “In British Columbia and Alberta, for example, we reassess every property at market value every year. To do so, residents have to send an application outlining why they believe their property taxes are high and support the claim with data.