Property Assessment

The assessment of all property in Ontario is carried out by the Municipal Property Assessment Corporation (MPAC). The current value assessment, or CVA, of a property is an estimate of the market value of a property at a fixed point in time (the valuation date), or the amount the property would sell for in an open market on a given date (i.e., in an arm's length sale between a willing buyer and a willing seller).

Four-Year Assessment Cycle

Amendments to the Assessment Act provide for a four-year assessment update cycle, beginning with the 2009 taxation year. Beginning in 2009 and continuing through 2012, property assessment values will be based on a January 1, 2008 valuation date (i.e., the full CVA of a property will reflect an estimated market value as at January 1, 2008).

The next assessment update will take place in 2012 for taxation years 2013-2016. The Assessment Cycle chart below provides the valuation dates used for each taxation year from 1998 through 2016.

Taxation Year Valuation Date
1998, 1999, 2000 June 30, 1996
2001, 2002 June 30, 1999
2003 June 30, 2001
2004, 2005 June 30, 2003
2006, 2007, 2008 January 1, 2005
2009, 2010, 2011, 2012 January 1, 2008
2013, 2014, 2015, 2016 January 1, 2012
2017, 2018, 2019, 2020 January 1, 2016

Assessment Increases and Decreases

Market value assessment increases between the two valuation datesre phased-in over four years for all property classes, with one-quarter of the assessment change being applied in each of the four years.

Assessment decreases are not subject to phase-in and are implemented immediately. Properties experiencing a decrease in CVA due to the reassessment will therefore benefit from the full reduction in the taxation year in which the decision is finalized.

The Province, in introducing the phase-in of assessment increases, has stated that the new system will provide a greater level of stability for property owners, and will help to smooth out market value increases and provide a more gradual move to the new assessment level. Taxpayers will now be able to better plan for changes in their assessments, given the element of predictability in property assessments. By extending the phase-in provisions to all property classes, business taxpayers benefit from the same increased stability and predictability that the phase-in provides homeowners, and equity and consistency between different property types is maintained.

Property Assessment Notice

In 2016, MPAC mailed "Property Assessment Notices for the 2017 - 2020 property tax years", which advised property owners of the new current assessed value of their property based on a January 1, 2008 valuation date, the previous CVA value (based on a January 1, 2005 valuation date), the annual phase-in amount, and the phased-in CVA values that would be used for taxation in each of 2017, 2018, 2019 and 2020. The phased-in values provided on the Property Assessment Notice are based on the assumption that the property's assessment will not change over the four-year phase-in period.

It is important for property owners to review their Property Assessment Notice carefully. If there are errors in the notice, contact MPAC directly to have them corrected.

If a property owner disagrees with the value of the CVA, they must file a Request for Reconsideration with MPAC. Visit Assessment Appeals or MPAC for important information and deadlines.


CVA Changes during the Four-Year Phase-in period

Where a property undergoes a change in CVA during the four-year phase-in period, either due to improvements to the property (e.g. new construction or renovations), demolition, or revisions to the CVA due to assessment appeals or Requests for Reconsideration, the phased-in assessment amount used for taxation in the current and/or subsequent years will change. Where a property has undergone such a change, MPAC will advise property owners and the City of the revised "destination" CVA, and the revised phase-in CVA value to be used for taxation in that year.

CVA Changes due to Assessment Appeals and/or Requests for Reconsideration (RIR)

Where assessment appeals or Requests for Reconsideration result in changes to the "destination assessment" (the CVA based on a January 1, 2016 valuation date), MPAC must calculate revised phase-in amounts for any applicable taxation years. Assessment appeal changes only apply to the taxation year under appeal and/or future years, but not retroactively to years where no appeal was made.

For additional information about assessment, the assessment appeal process or to obtain a Request for Reconsideration form, call MPAC at 1-866-296-MPAC(6722) or visit

Information about the ARB process and filing fees are available by calling the ARB at 1-800-263-3237 or visiting


Dan Robinson
 Supervisor of Revenues & Taxation
 (705) 474-0400 x2128