Each spring, MPAC mails a Property Income and Expense Return, known as PIER, to owners of rented commercial, industrial and apartment buildings. Filing it is mandatory, and what you file becomes part of MPAC’s evidence about your property.
Timing
When it arrives
PIER is mailed each spring and carries its own filing deadline. In 2026, MPAC mailed PIER on May 27, and it was due July 22. See key dates for the current year. The window between mailing and the deadline is short, so we recommend starting the review as soon as the return arrives.
The stakes
Why it matters
MPAC uses the rent, vacancy and expense figures you report to build its income approach to value for your property, the same approach it applies at the Assessment Review Board. An incomplete or inconsistent return can work against you later in an appeal, even though filing is mandatory regardless of whether you plan to appeal at all.
What is asked
What PIER asks for
PIER asks for the rent, vacancy and expense information for the property, covering the period MPAC specifies. It is filed property by property, so an owner with several rented buildings receives a separate return for each roll number.
Coverage
Who receives it
MPAC mails PIER to owners of rented commercial, industrial and apartment buildings, which in practice covers most of the property types BrookLex works with: industrial, retail and plazas, office and multi-residential. The deadline is the same mandatory deadline for every property that receives one.
Our role
How we help
We review the return before it is filed, check the figures against your leases and financial statements, and keep a copy in your file for any future appeal. If the numbers point to an assessment worth challenging, we tell you before the filing deadline, not after.
Keeping a clear record of what was filed matters as much as filing on time. If an appeal comes later, whether that year or a future one, the PIER on file is one of the first documents MPAC and the Board will look at, so we hold a copy alongside your leases and financial statements for as long as the file is open.
Learn more about how MPAC values income properties, or ask about a portfolio review if you own several rented properties. If a PIER filing turns up grounds for an appeal, see assessment appeals.
Does filing PIER mean I am appealing my assessment
No. It is a separate, mandatory filing. Whether to also file a Request for Reconsideration or an appeal is a different decision, one we can help you make at the same time.
What if I have multiple rented properties
PIER is filed property by property. A portfolio review folds all of them into a single annual check, alongside any appeals or applications each one may need.
What if I missed a past PIER deadline
Tell us the property and the year. We will look at what was filed, if anything, before deciding on next steps.