Ontario's rent cap is 1.9%, inflation is 2.5%. The gap costs $151

Statistics Canada put out September inflation on October 19. Ontario came in at 2.5%. Ontario's rent cap for 2027 is 1.9%. Every Ottawa landlord I know has a view on that gap, and most of the views are louder than the dollars.

I ran the dollars. Then I checked whether they change anything about what you should do this fall.

What September said about rent

The national rent index rose 2.8% year over year in September, the same as August. All-items CPI rose 3.1%, and 2.2% excluding gasoline. I covered the gasoline wedge in my August inflation post.

Deflate rent by each. Against the headline: 1.028 / 1.031 = 0.9971, so rent lost 0.29% in real terms. Against ex-gasoline: 1.028 / 1.022 = 1.0059, so rent gained 0.59%. Rent is roughly standing still against prices. Neither a squeeze nor a windfall.

That is a national number, and it blends provinces with very different rent rules. The Ontario-only rent print I have is August's, 2.4%. I did not find September's Ontario rent figure in the release, so I am not going to guess it.

What I can compute for Ontario is the all-items index. It was 166.1 in September 2025 and 170.3 in September 2026. 170.3 / 166.1 = 1.0253, so 2.5%. July was 2.0% and August was 2.4%. It is climbing, and it is now above the 1.9% guideline.

The lag, in dollars

Take a $2,000 unit. Serve the increase at 1.9% and the rent goes to $2,038.

Ontario prices are rising 2.53%. Your rent is rising 1.9%. The gap is 0.63 points. On $2,000 that is $12.57 a month, or about $151 a year in purchasing power you do not get back.

That is the whole cost of the guideline running below inflation, on a typical unit, for a year. I wrote in August that the guideline is not what caps Ottawa rents, and this is the arithmetic behind that sentence.

Now put one vacant month next to it. A month empty on that unit is $2,000 of rent that never arrives. $2,000 / $151 = 13.3. One month of vacancy costs as much as 13 years of the guideline lag.

So when a landlord tells me the guideline is robbing him, I ask what his vacancy looked like last year. It is the same conversation as the one about Ottawa's softening rental market: the lease you keep is worth more than the extra half point you fight for.

If you have not served notice yet

The date matters, so count it. The guideline that applies is the one in force on the day the increase takes effect, and you need at least 90 days of written notice on the LTB's N1 form, plus 12 months since the last increase.

An increase that took effect on December 31 needed an N1 served by October 2. That window closed three weeks ago. If you serve today, October 23, the earliest effective date is January 21, 2027 (October 23 plus 90 days). Every day from here is a 1.9% day, whatever your tenant's anniversary was.

So the question left is not 2.1% versus 1.9%. It is whether to serve at all. The N1 is the one increase you get each year and you cannot backdate it. Diarize the anniversary, count back 90 days, serve by hand and keep proof. I sell houses, so for how the LTB reads a defective notice, talk to a paralegal or a lawyer.

The 2028 number is where this gets interesting

Ontario sets the guideline from the Ontario CPI, June to May data, capped at 2.5%. The 2027 figure of 1.9% came from a window that ended in May 2026.

The window for the 2028 guideline opened in June. Three months I can see so far, July at 2.0%, August at 2.4% and September at 2.5%, are each at or above this year's 1.9%. Those are year over year rates and the guideline uses averages, so this is a rough read, not a calculation.

Here is the call, on the record. The 2028 guideline, announced in the first half of 2027, will come in above 1.9%. I am not calling the cap. The window has eight months still unwritten, and if oil falls the way it rose, I am wrong.

There is no true-up. If the next number is higher, nobody sends back the difference you missed. The guideline is a snapshot of the past, so put the N1 date in your calendar the way you do your insurance renewal.

What I would do

Keep good tenants and serve the increase. Do not turn over a sitting tenant to chase a half point.

Do not build a purchase case on the guideline lagging inflation. $151 a year does not carry a mortgage. Vacancy, repairs and the property tax bill carry it. Run a unit's real numbers, which is what I did in the condo post on Ottawa vacancy when the vacancy rate was 0.6% and the unit still lost money.

If you are buying a rental, assume the guideline sits between 1.9% and 2.5% for the next few years and underwrite at the low end. If the next print is higher, that is gravy.

Tax and legal questions belong with your accountant and paralegal. I will tell you what the unit is worth.

Own a rental in Ottawa and want it run on your actual rent roll? Call me at 613-262-6545 or email fil@613realtor.ca, and I will tell you whether the numbers say hold, raise or sell. If you are shopping, here are current listings.