Why a wrong TMI bill makes your HST wrong too

Additional Rent is not just a rent question. It is a tax question. In Ontario, 13% HST rides on top of it, and if the TMI number is wrong, the HST on it is wrong too.

What carries HST

In Ontario, Additional Rent is a taxable supply, so it carries 13% HST. That includes recovered property taxes and insurance: the underlying tax bill has no HST, but once the landlord re-bills it to you as Additional Rent, it becomes taxable. So the HST line on your statement should be 13% of the net Additional Rent, not of some other base.

Why a wrong TMI makes your HST wrong

Your share of the pool sets the Additional Rent, and the Additional Rent sets the HST. If the pool contains a cost your lease excludes, you overpaid the charge and the 13% on top of it. The error compounds. Correcting the TMI corrects both.

Your input tax credit has to match

If you are registered for HST, you claim the HST you paid on Additional Rent as an input tax credit. That claim should match what the landlord actually charged and remitted. When the statement is off, your ITC claim is off, and a mismatch is exactly what a CRA review looks for. Getting the reconciliation right keeps your filing clean.

This is a compliance step, not a fight

Checking your Additional Rent is not about picking a fight with your landlord. It is about paying the right amount and filing the right HST. Both sides benefit from a statement that ties out. See the CRA rules on HST for commercial rent, and confirm your own numbers with a free check.

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.