Key Takeaways
- Ontario’s provincewide property reassessment will continue to be deferred, with no new reassessment year, valuation date, phase-in framework, or assessment notice schedule announced.
- Property assessments for the 2027 tax year remain based on fully phased-in January 1, 2016 values.
- The extended delay creates forecasting, transaction, investment, and portfolio-planning uncertainty for property owners.
- Businesses can evaluate current assessment opportunities and model potential reassessment exposure before the next provincewide update.
- Early preparation can improve response readiness when Ontario announces its next reassessment framework.
Written by:
Dorothy Marshall, Managing Director, Property Tax
Matt Cunningham, Vice President, Property Tax
Ontario’s 2026 Economic Outlook and Fiscal Review confirmed that the provincewide property tax reassessment will remain deferred to provide stability for taxpayers. The government did not announce a new reassessment year, valuation date, phase-in approach, or assessment notice timeline.
For the 2027 property tax year, Ontario property assessments remain based on fully phased-in January 1, 2016 values. The prolonged reassessment delay has created growing uncertainty for ICI property owners, affecting tax forecasting, transaction planning, and long-term portfolio decisions.
Here is what businesses need to know about the continued deferral, the risks created by the extended assessment freeze, and the steps they can take now:
The Latest Ontario Reassessment Update
Ontario’s last province-wide property assessment update used a January 1, 2016 valuation date. The assessment update originally scheduled for 2020 was postponed during the COVID-19 pandemic and has remained on hold through subsequent provincial reviews.
For the 2027 property tax year, assessments continue to be based on fully phased-in January 1, 2016 values. However, the province-wide delay does not mean individual assessments are frozen. The Municipal Property Assessment Corporation (MPAC) may still update a property’s assessment following new construction, renovations, demolition, ownership changes, changes in use, or classification and tax liability updates.
In its 2026 Economic Outlook and Fiscal Review, the Ontario government confirmed that the provincewide reassessment will remain deferred. The update did not establish a new reassessment year, valuation date, phase-in framework, or assessment notice schedule. As a result, Ontario’s property assessment system continues to rely on January 1, 2016 values for the 2027 property tax year, while property-specific assessment changes may still occur under the existing framework.
With no new reassessment timeline or valuation date announced, property owners should continue evaluating their existing assessments while preparing for the financial and operational effects of an eventual province-wide update. Because assessments remain anchored to a 2016 valuation date, changes in property values have not occurred uniformly across markets, asset classes, or individual properties. As a result, a future reassessment could materially redistribute tax obligations among property owners.
Why the Reassessment Delay Matters
A provincewide reassessment updates properties to a common valuation date, allowing tax obligations to be distributed based on how values have changed relative to one another.
A reassessment does not, by itself, determine the total amount a municipality collects. Instead, it can redistribute each property’s share of the tax burden. The longer Ontario’s reassessment is delayed, the greater the potential for significant differences between current assessments and present market or operating conditions.
What this means for property owners:
- Changing tax share: Properties and sectors have not appreciated or declined at the same rate, creating the potential for meaningful shifts when assessments are updated
- Greater forecasting uncertainty: Without a confirmed reassessment timeline or valuation date, businesses must plan for a wider range of potential tax outcomes
- Older valuation evidence: Current assessments remain tied to January 1, 2016 values, even when the property’s use, income, condition, or surrounding market has changed
- More pressure to prepare early: Once new assessments are issued, businesses may have limited time to review values, gather evidence, and determine the appropriate response
These issues extend beyond annual property tax expense. They can also affect transactions, lease economics, capital planning, and broader portfolio strategy.
Key Risks for Commercial Property Owners
Ontario’s reassessment delay creates more than policy uncertainty. It affects how businesses forecast property tax expenses, evaluate transactions, plan investments, and manage risk across their portfolios.
Three areas require particular attention:
Future Tax Volatility
Properties and sectors have experienced different market and operating conditions since 2016. When assessments are eventually updated, some owners may experience material changes in their relative tax position, including:
- Forecasting risk: Current assessments may not provide a reliable basis for estimating taxes after reassessment
- Budget pressure: Material increases could affect operating budgets, recoveries, cash flow, and financial covenants
- Limited response time: Once new values are released, property owners may have a narrow window to validate data, evaluate the assessment, and preserve available review or appeal rights
Scenario modeling can help businesses estimate potential exposure and identify the properties requiring the closest review.
Portfolio & Investment Uncertainty
Understanding where current assessments diverge most significantly from present property and market conditions can help businesses prioritize review and planning efforts. For example:
- Outdated assessment baselines can complicate occupancy-cost projections, leasing decisions, investment analysis, and capital planning
- Uncertain future tax costs can make recoveries and long-term occupancy expenses harder to forecast
- Reassessment exposure may affect return assumptions for acquisitions, renovations, and redevelopment
- Businesses may need to account for a wider range of potential tax outcomes when allocating capital across properties
Transaction & Underwriting Risk
Reliance on a 2016 valuation baseline can introduce additional uncertainty into acquisitions, dispositions, financing, and long-range planning:
- Incomplete pro formas: Current assessments may not reflect the property’s potential tax position following reassessment
- Due diligence concerns: Buyers, lenders, and investors may require additional analysis of future property tax exposure
- Strategic uncertainty: An undefined reassessment timeline makes it harder to incorporate future tax obligations into renovation, redevelopment, and disposition decisions
Property tax scenario modeling should therefore form part of transaction due diligence and long-range portfolio planning.
Opportunities Before the Next Reassessment
While Ontario’s provincewide reassessment remains on hold, property owners may still have opportunities to review and potentially reduce current-year property tax liabilities where supported by the facts and applicable legislation.
Property-specific changes, market conditions, operational challenges, and assessment discrepancies can all create opportunities for review independent of a provincewide reassessment.
The following strategies may warrant evaluation:
- File an appeal to correct an overvaluation where the property is not restricted by issue estoppel
- Apply for in-year municipal tax reductions based on specific events
- Capture any eligible credits or incentives linked to capital activity
Each path is evidence-driven and can lead to real savings before reassessment returns.
File an Appeal to Correct Overvaluation
Where market evidence indicates that an assessment may not accurately reflect a property’s assessed value under Ontario’s assessment framework, property owners should evaluate available review and appeal options.
You should consider an appeal if or when any of the following trigger events occur:
- Acquisitions, dispositions, or reorganizations: Transactions that reveal a gap between supported market value and the current assessment
- Capital changes or impairments: Renovations, reconfigurations, or functional obsolescence that affect utility or marketability
Appeals are evidence driven. Property owners should evaluate potential review opportunities promptly following significant property, as filing rights and deadlines may vary.
Apply for In-Year Municipal Tax Relief (Tax Applications)
Municipalities provide property tax relief mechanisms for qualifying events such as changes in use, renovations, demolition, or other circumstances defined by applicable legislation and municipal requirements. These applications don’t challenge valuation; they provide event‑based tax relief that can lower the affected year’s taxes without waiting for a full reassessment.
Preparing for What’s Next
Ontario has confirmed that the provincewide reassessment will continue to be deferred, but the timing and structure of the next reassessment remain uncertain. Businesses can benefit from preparing now rather than reacting once new assessments are issued.
Why early engagement matters:
- Improve response readiness: Understanding your portfolio today can support a faster review when future assessment notices are issued
- Model future exposure: Scenario planning may help organizations understand potential impacts on budgets, accruals, and cash flow
- Identify current opportunities: Portfolio reviews may uncover assessment concerns or relief opportunities that can be addressed before the next reassessment cycle
- Strengthen supporting documentation: Organizing property records, operating data, and market support now can streamline future assessment reviews
Preparation is ultimately about reducing uncertainty. Organizations that understand their portfolio exposure and maintain strong supporting documentation will be better positioned to respond when Ontario ultimately announces its next reassessment framework.
Prepare for Ontario’s Next Property Reassessment
Ontario property assessments remain based on January 1, 2016 values, but that does not mean businesses should wait for the next reassessment to act. DMA helps organizations understand current property tax exposure, identify opportunities within existing assessments, and model how a future reassessment could affect budgets and portfolios. Build the visibility and documentation now to make more informed decisions when Ontario’s next reassessment moves forward.
This website content should be used for general informational purposes only, and not as a substitute for consultation with professional tax, legal, or other competent advisors.
Before making any decision or taking any action based upon information contained on this website, you should consult with a DMA professional.