How TMI reconciliation actually works (and where it goes wrong)

Part of your commercial rent is not fixed. It moves with the building’s running costs, and once a year the landlord settles up. That settle-up is the reconciliation, and knowing the exact sequence tells you where to look. (New to the term TMI itself? The Ontario TMI guide covers the basics.)

The yearly cycle, in four steps

Step one, before the year starts, the landlord estimates the shared operating costs and bills you a monthly slice of your share. Step two, through the year, the actual invoices come in: snow removal, utilities, repairs, taxes, insurance. Step three, after the year closes, the landlord totals those actuals, applies your share percentage, and gets your real number. Step four, it compares your real number to what you already paid in estimates and issues the difference, a bill if you underpaid, a credit if you overpaid. That last comparison is the statement in your hand.

Where the sequence goes wrong

Each step has a failure mode. The estimate can be set high and never trued up. An actual invoice can be sorted into the shared pool when your lease excludes it. The share percentage can be stale from a re-measured building. And the final true-up can arrive with no backup, so you cannot see the actuals behind it. None of these look dramatic on the page. They look like ordinary lines.

Who prepares it

The landlord owns the building, but a property manager usually builds the statement from invoices and the lease. That is not a reason to distrust it. It is a reason to read it, because a busy manager sorting hundreds of invoices makes quiet mistakes.

What you can do about it

Two rights matter. Most Ontario commercial leases give you an objection window, often a set number of days after you receive the reconciliation, and many give you a right to see the backup or audit the numbers. Separately, Ontario’s general limitation period usually gives you about two years from discovering an overpayment to act. Read the audit-rights and objection clauses in your own lease for the exact terms.

To see how your own reconciliation ties out, upload your lease and statement for a free check, or read the Ontario TMI & Additional Rent guide for the wider picture.

TMI Proof checks your lease and statement; it is not a law firm and nothing here is legal or tax advice. Figures and rules are general, and your lease and Ontario law govern. Confirm each finding with your accountant or a commercial-lease lawyer before acting.