not set assessment policy but it does administer these policies. Its main responsibility is to calculate assessment values and to classify properties according to their use, for each of the over four million properties in Ontario. These values are also provided to municipalities on an annual assessment roll. The City, Region and the Province use these values when they calculate property taxes and education taxes. Additions and improvements to your property will create a change to the market value. For questions concerning assessment and property valuation, please contact the Municipal Property Assessment Corporation office (MPAC). Call 1-866-296-6722 or visit the MPAC web site at www.mpac.ca .