How MPAC Assessments Affect Your Property Taxes in Ontario

If you own property in Ontario, MPAC (Municipal Property Assessment Corporation) determines its assessed value—and that number directly affects how much property tax you pay. Understanding this system helps you budget accurately and know when an appeal makes sense.

How MPAC Assessments Work

MPAC assesses every property in Ontario on a four-year cycle. The current assessment base year is January 1, 2016—which means your property's assessed value may differ significantly from its current market value.

Factors MPAC considers:

• Location and lot size
• Living area and building age
• Number of bathrooms, fireplaces, garages
• Basement finish and quality
• Recent renovations (if permits pulled)
• Comparable sales in the area

Assessment vs. Market Value vs. Tax Bill

These are three different numbers:

Your tax bill = MPAC assessed value × your municipality's tax rate. The rate varies by municipality.

How Property Taxes Affect Your Mortgage

Lenders include property taxes in your GDS (Gross Debt Service) calculation:

Impact example on a $600,000 purchase:

• Annual property tax $4,000: Reduces borrowing power by ~$25,000
• Annual property tax $6,000: Reduces borrowing power by ~$40,000

Higher property taxes directly reduce how much mortgage you qualify for. This is why buyers should research tax rates before falling in love with a property.

Calculate your affordability including taxes

When to Request a Reconsideration (RfR)

You can challenge your MPAC assessment if:

• Your assessed value is significantly higher than comparable properties
• MPAC has incorrect information (wrong square footage, extra bathrooms listed)
• Property damage has reduced value
• Zoning changes affect use

Timeline: You have until March 31 each year to file an RfR for the current tax year.

Success rates: MPAC reports that approximately 25% of requests result in a reduced assessment.

The Reassessment Freeze

Ontario has frozen MPAC reassessments at 2016 values since 2020. A new assessment cycle has not yet been announced. When it does happen, properties that have appreciated significantly since 2016 may see substantial tax increases.

Planning ahead: If you bought recently at a price well above the MPAC assessment, budget for a potential tax increase when reassessment occurs.

Budget for Property Taxes

Before purchasing, look up the property's current tax bill (available from the municipality or listing). Factor this into your monthly carrying costs and mortgage qualification—it's not optional, and it can't be financed.