A supplementary tax bill is a bill issued by the City which reflects any additions or
improvements you have made to your property. Owners of newly constructed homes will receive a
supplementary tax bill pertaining to the assessed value of their house effective their
occupancy (closing) date.
From the information supplied by the Municipal Property Assessment Corporation (MPAC), the
City of Mississauga calculates the tax amounts due and issues tax bills. Until the City
receives the information from MPAC, we cannot issue a tax bill, and consequently there may be a
considerable time lapse from the actual occupancy date until you receive a bill.
You will receive a supplementary tax bill for one of the following reasons:
- Your house was recently built and when you purchased it, it was only assessed for vacant
- You had some renovations/improvements done to your property that has increased its market
- The tax class of the whole or portion of your property assessment has changed.
If you think your supplementary assessment is incorrect, a reconsideration process is
available through MPAC, for which there is no fee. Visit the MPAC website at the related link
above for details on how to request a reconsideration.
You also have the right to appeal to the Assessment Review Board (ARB)which is an
independent tribunal. An appeal must be filed within 90 days of the date of the notice of
assessment. Visit the ARB website at www.arb.gov.on.ca for all the details on how to file an assessment appeal.