Appeal Property Assessment in Mississauga - Guide

Taxation and Finance Ontario 3 Minutes Read · published February 11, 2026 Flag of Ontario

Mississauga, Ontario homeowners may disagree with their property assessment value and can start a review or appeal process to seek a reduction. This article explains the local steps, the review vs appeal pathway, responsible offices, common timelines and practical action steps for property owners in Mississauga. It covers how to request a review with MPAC, when to file with the provincial Assessment Review Board, and where to find official forms and contacts.[1]

Overview: review then appeal

Most residential disputes begin with a Request for Reconsideration (review) to the Municipal Property Assessment Corporation (MPAC). If MPAC does not change the assessment, the next step is an appeal to the Assessment Review Board (tribunalsontario.ca). The City of Mississauga provides local property tax and assessment information but does not change assessed values; MPAC and the Assessment Review Board handle assessments and appeals.[2][3]

Start with MPAC's review request before filing an appeal to the tribunal.

Penalties & Enforcement

Assessment appeals and reviews are administrative processes; there are no typical "fines" for filing an appeal itself listed on the primary official pages. Detailed enforcement and sanctions for false statements, missed payments or non-compliance are handled under provincial rules and tribunal orders.

  • Fines or monetary penalties: not specified on the cited page.
  • Escalation: initial MPAC reconsideration, then tribunal appeal to the Assessment Review Board; specific escalation fines or daily penalties are not specified on the cited pages.
  • Non-monetary sanctions: tribunal orders can confirm assessments, dismiss appeals, or make binding decisions; further enforcement may involve court proceedings if orders are ignored.
  • Enforcer and contacts: MPAC handles assessments and review requests; the Assessment Review Board (Tribunals Ontario) hears appeals; Mississauga's Taxation section provides local tax payment and account services.[2][3]
  • Appeal time limits: exact filing deadlines and limitation periods are not specified on the cited pages; check MPAC notice dates and tribunal filing rules for official timelines.
  • Defences and discretion: common defences include factual errors in property description, incorrect comparable properties, or permitted exemptions; seek MPAC review or provide evidence at the tribunal.
Tribunal orders are binding and may be enforced through the courts if not respected.

Applications & Forms

The primary forms and processes are:

  • MPAC Request for Reconsideration (Request a Review) – use MPAC's online review request process or contact MPAC for the appropriate form; fee: not specified on the cited page.[2]
  • Assessment Review Board Notice of Appeal / tribunal filing – file with Tribunals Ontario (Assessment Review Board) following their published filing instructions; fee and exact filing procedure: not specified on the cited page.[3]
  • City of Mississauga property tax account services – used for tax billing and payments; appeals do not change tax billing until assessment changes are effective.[1]
If you cannot find a published form, contact MPAC or the Assessment Review Board directly for the current submission method.

How-To

  1. Find your assessment notice date and review the details against comparable properties.
  2. Request a reconsideration from MPAC with evidence (photos, comparable sales, building permits).
  3. If MPAC declines to change the assessment, prepare and file an appeal with the Assessment Review Board following their filing rules.
  4. Attend the hearing or submit written evidence; follow tribunal directions and deadlines.
  5. If the tribunal issues an order, ensure the assessment roll and tax billing are updated and pay or seek refunds as appropriate.

FAQ

Who decides my property assessment?
The Municipal Property Assessment Corporation (MPAC) determines assessed values; the Assessment Review Board hears appeals on assessments.
Do I need to request MPAC review before appealing?
Yes, property owners typically request a reconsideration with MPAC first; if unsatisfied, they may appeal to the Assessment Review Board.
Are there filing fees or deadlines?
Filing fees and exact deadlines are not specified on the cited pages; check the MPAC and Assessment Review Board pages for current rules and timelines.

Key Takeaways

  • Start with MPAC's Request for Reconsideration before filing a tribunal appeal.
  • The Assessment Review Board handles appeals and issues binding decisions.
  • Keep clear evidence, note notice dates, and contact official offices for forms and filing rules.

Help and Support / Resources

  1. [1] City of Mississauga - Property assessment and taxes
  2. [2] MPAC - Municipal Property Assessment Corporation
  3. [3] Tribunals Ontario - Assessment Review Board (ARB)

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