Report Property Assessment Errors - Whitby, Ontario

Taxation and Finance Ontario 3 Minutes Read · published May 26, 2026 Flag of Ontario

If you live in Whitby, Ontario and suspect your property assessment is incorrect, act promptly to protect your property tax position. This guide explains how to check assessment details, request a review from the Municipal Property Assessment Corporation (MPAC), and, if needed, appeal to the Assessment Review Board. It also describes municipal contacts in Whitby for tax account questions, the typical evidence required, and practical next steps so you can report errors without delay.

Start by comparing your assessment notice to recent sales and property details before filing any request.

How to check and report an assessment error

Begin by reviewing your MPAC assessment notice and online property details. If you believe factual information is wrong (lot size, property type, year built, or listed improvements), request a reconsideration with MPAC. If MPAC confirms your assessment or you disagree with the result, you may file an appeal with the Assessment Review Board.

  • Review your MPAC property report and assessment notice for incorrect facts and measurements.
  • Submit a Request for Reconsideration (RfR) to MPAC to correct factual errors or present new evidence. MPAC RfR[1]
  • If MPAC does not change the assessment, file an appeal with the Assessment Review Board (tribunal). Assessment Review Board[2]
  • For tax account or billing questions after an assessment change, contact the Town of Whitby tax office. Town of Whitby[3]

Penalties & Enforcement

Property assessment correction processes are administrative. Neither MPAC nor the Assessment Review Board publish monetary fines for filing a Request for Reconsideration or an appeal on their public guidance pages. Where specific penalties or fines exist for false statements to authorities, they are set out in provincial legislation or agency rules; such amounts are not specified on the cited pages below.

MPAC and the Assessment Review Board focus on correcting assessments rather than imposing municipal bylaw fines.
  • Monetary fines: not specified on the cited page.
  • Escalation for repeat or continuing offences: not specified on the cited page.
  • Non-monetary sanctions: administrative orders or tribunal decisions may adjust assessed value or direct further action; specific sanctions not specified on the cited pages.
  • Enforcers and contacts: MPAC handles assessments and inquiries; the Assessment Review Board (Tribunals Ontario) hears appeals; the Town of Whitby manages tax billing and collection.
  • Appeals and time limits: the Assessment Review Board sets appeal filing deadlines; exact time limits or filing fees are not specified on the cited municipal pages and should be verified on the tribunal and MPAC pages cited below.

Applications & Forms

The main administrative form is MPAC’s Request for Reconsideration (RfR) used to request changes to your property record. If MPAC denies or does not fully address your concerns, you can file an appeal with the Assessment Review Board following the tribunal’s process and forms. Specific form numbers, fees, and submission methods should be confirmed on the official MPAC and tribunal pages cited below.

Evidence and practical steps

Collect clear, dated evidence to support your claim: recent comparable sales, a current survey, photographs, building permits, or municipal records that show factual errors. Keep copies of all submissions and MPAC responses.

  • Evidence: surveys, photos, building permits, and recent comparable sales.
  • Deadlines: verify filing deadlines with MPAC and the Assessment Review Board; the exact statutory time limits are not specified on the cited municipal pages.
  • Forms: Request for Reconsideration (RfR) via MPAC; tribunal appeal forms where needed.
Keep a dated log of every communication and submission you make about the assessment.

FAQ

How do I start a review of my property assessment?
Begin with a Request for Reconsideration (RfR) through MPAC to correct factual errors; if unresolved, file an appeal with the Assessment Review Board.
Will correcting the assessment change my tax bill automatically?
If MPAC or a tribunal changes your assessed value, the Town of Whitby will update your tax account; contact the town’s tax office for billing adjustments.
What evidence is most useful?
Recent comparable sales, a current survey, building permits, and clear photographs that show the factual discrepancy.

How-To

  1. Gather evidence that shows the factual error in your MPAC record.
  2. Submit a Request for Reconsideration to MPAC with supporting documents.
  3. If unsatisfied, prepare an appeal and file with the Assessment Review Board within the tribunal’s deadline.
  4. Notify the Town of Whitby tax office if an assessment change is confirmed so they can adjust your tax account.

Key Takeaways

  • Start with MPAC’s Request for Reconsideration before appealing to a tribunal.
  • Collect clear, dated evidence like surveys and recent sales.

Help and Support / Resources

  1. [1] MPAC - Request a review / Request for Reconsideration
  2. [2] Tribunals Ontario - Assessment Review Board
  3. [3] Town of Whitby - Property taxes and municipal contacts

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