Quebec Rent Increase for Property Tax and Insurance Changes: The Excess-Above-Base Rule

Under the old Quebec rent increase formula, your full property tax and insurance increases were added to the adjustment. The 2026 method changed that — now only the portion that exceeds the 3.1% base rate counts. This "excess-above-base" rule trips up landlords who expect dollar-for-dollar credit for rising costs.

How the Excess Rule Works

The logic is simple: the 3.1% CPI base rate already accounts for general inflation, including the normal upward drift in taxes and insurance. So the formula only gives you additional credit for increases that go beyond what the base rate covers.

If your tax or insurance increase is 3.1% or less: no additional adjustment. The base rate absorbs it.

If your increase exceeds 3.1%: you get credit for the excess portion only, proportioned to the target unit's share of building revenue.

Tax Calculation Example

A triplex with three equal-rent units. Municipal taxes went from $4,500 to $4,860 — a 8% increase.

1. The base threshold is 3.1% of $4,500 = $139.50
2. The actual increase is $4,860 − $4,500 = $360
3. The excess is $360 − $139.50 = $220.50 per year
4. One unit's share (33.33%) = $73.50 per year = $6.13/month

That $6.13 gets added on top of the 3.1% base CPI adjustment. If municipal taxes had only gone up 2%, this component would be zero.

School Taxes Work the Same Way

School tax assessments follow identical treatment. Calculate the year-over-year percentage change, check whether it exceeds 3.1%, and add only the excess. In most Quebec municipalities, school tax rates have been relatively stable, so this component is often zero.

Combine both: if municipal taxes increased 8% (excess = 4.9%) and school taxes increased 1% (no excess), you only get the municipal tax excess.

Insurance Premiums

Building fire and liability insurance follows the same excess-above-3.1% logic. If your premium went from $1,800 to $1,944 (an 8% increase):

1. Base threshold: 3.1% of $1,800 = $55.80
2. Actual increase: $1,944 − $1,800 = $144
3. Excess: $144 − $55.80 = $88.20 per year
4. One unit's share (triplex): $29.40/year = $2.45/month

If your insurance increase is 3.1% or less, this component is zero. The excess rule means you only get an insurance adjustment during years with above-inflation premium jumps — common after major claims or market hardening.

What to Bring as Proof

For a TAL hearing, bring the original supporting documents for:

• Municipal property tax bills for both years
• School tax assessment notices for both years
• Insurance policy renewal notices or premium invoices for both years

The adjudicator calculates the percentages and applies the excess rule. If your documents are missing or the numbers don't match what you entered on Form RN_2026_A, those entries can be rejected.

Why This Matters for Small Landlords

The excess rule means small, steady increases in taxes and insurance generate zero additional rent adjustment — the base rate absorbs them. But a single sharp jump (a municipal reassessment, an insurance claim that spikes your premium) can generate a meaningful addition.

For a duplex owner whose taxes spiked after a reassessment year, this distinction could mean the difference between a 3.1% adjustment and a 5%+ adjustment. Knowing how to document and calculate the excess correctly is the difference between leaving money on the table and capturing what the formula allows.

The Quebec Rent Increase Guide includes a calculation worksheet that handles the excess-above-base rule for taxes, school taxes, and insurance — with space to record both years' figures and compute each component.

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