CMHC mortgage rules in Canada for 2026: tier rates, the $1.5M cap, and the PST trap

If you are putting less than 20% down on a Canadian home in 2026, CMHC mortgage default insurance is mandatory and the rules that govern its cost are at their most generous in over a decade. The 2024 federal mortgage reforms raised the insured-price cap to $1.5 million, extended 30-year amortizations to first-time buyers on any eligible insured purchase, and left the underlying premium tier ladder unchanged. This guide walks through what the rules actually cost a buyer, the cash line at closing that catches first-time buyers in three provinces, and the math that decides whether to put 20% down instead.

What CMHC actually is and why the premium exists

The Canada Mortgage and Housing Corporation is the federal Crown corporation that backstops insured mortgages on behalf of lenders. The premium you pay does not protect you. It protects the lender, by guaranteeing the lender's loss if you default. Without that backstop, lenders generally would not write a mortgage with less than 20% down at all. The premium is what makes the loan possible.

Two private insurers, Sagen (formerly Genworth Canada) and Canada Guaranty, also operate in this space. All three insurers publish identical premium rates. The lender, not the borrower, chooses which insurer underwrites a given application.

The 2026 premium tier ladder

CMHC publishes premium rates as a percentage of your loan amount, organized by loan-to-value (LTV): your mortgage divided by the purchase price. The higher the LTV (the less you put down), the higher the rate. The tier table:

The maximum insurable LTV is 95%, so CMHC will not insure mortgages with less than a 5% down payment. A surcharge of 0.20% is added to the rate on top whenever the amortization exceeds 25 years (more on that below). These rates have been stable since CMHC's 2017 schedule. The most recent CMHC update in this space was the July 14, 2025 reset of multi-unit rental premiums, which does not affect owner-occupied buyers.

A concrete example. Buy a $500,000 home with $25,000 down (5%). The base loan is $475,000, LTV is 95%, you land in the top tier. The premium is:

Premium = 4.00% × $475,000 = $19,000

That $19,000 gets rolled into the mortgage, so what you actually borrow is $494,000 and pay it off across the amortization. You do not write a separate cheque for the premium itself. The PST on the premium is the one piece you do write a cheque for; we get to that shortly.

What if you found another $25,000 of down payment? Total down $50,000, LTV drops to 90%, premium drops to the 3.10% tier:

Premium = 3.10% × $450,000 = $13,950

Same property, $25,000 more down, $5,050 less in premium, and the lower base loan accrues less interest over the life of the mortgage too. The tier ladder is steep at the top: most of the savings from moving from 5% to 10% down come from crossing the 95%-to-90% LTV line, not from the smaller base loan.

The 2024 reforms that still define 2026

The federal government called its December 15, 2024 mortgage package "the boldest mortgage reforms in decades." Two of those changes are load-bearing for 2026 insured buyers and worth knowing in detail.

The insured-price cap rose to $1.5M

Before December 2024, CMHC would not insure a mortgage on a home priced above $1 million. That cap is now $1.5 million. Practically, this means a high-ratio (less-than-20%-down) purchase is now possible on a wider band of homes in Toronto, Vancouver, and other expensive markets. Above $1.5 million the rule still bites: you need at least 20% down for a conventional, uninsured mortgage. Above roughly $2 million most lenders are in jumbo-mortgage territory with bespoke private terms.

30-year insured amortizations, with a 0.20% catch

Insured amortizations were capped at 25 years for most of the past decade. The December 2024 reforms restored 30-year amortizations for two groups of buyers:

1. First-time home buyers can use a 30-year insured amortization on any eligible insured purchase, new or resale.
2. All buyers, first-time or not, can use a 30-year insured amortization on newly-built homes.

Other insured buyers still cap at 25 years. CMHC charges a 0.20% surcharge on the premium rate whenever the amortization exceeds 25 years. On the $500,000 / 5% down example above:

25-year amortization
  Base loan       = $475,000
  Premium rate    = 4.00%
  Premium         = $19,000

30-year amortization (FTHB or new build)
  Base loan       = $475,000
  Premium rate    = 4.00% + 0.20% surcharge = 4.20%
  Premium         = $19,950

  Delta           = +$950

The $950 surcharge is the small part of the trade-off. The bigger piece is interest: five extra years of compounding on the same balance adds up to materially more total interest paid. The right question is whether the lower monthly payment makes the purchase viable at all, not whether the lifetime cost is lower. It usually is not, lifetime, but it usually is, month-to-month. Run both scenarios through the mortgage calculator and the CMHC calculator before committing to either.

The PST trap nobody warns you about

CMHC's premium gets rolled into the mortgage. The provincial sales tax on the premium does not. It is payable in cash at closing, on top of your down payment. From CMHC's own borrower disclosure: "the sales tax cannot be added to the loan amount."

The three provinces that tax the CMHC premium itself in 2026:

Manitoba historically charged 7% but suspended the tax in 2020 as part of COVID-19 relief and has not reinstated it as of 2026. The other provinces and territories do not charge any tax on the premium.

Applied to the $500,000 / 5% down / 25-year example:

Down payment                              = $25,000.00
+ PST on $19,000 premium at 8% (Ontario)  =  $1,520.00
─────────────────────────────────────────────────────
Total cash at closing (Ontario)           = $26,520.00

In Quebec at 9%:        PST = $1,710 → $26,710 cash at closing
In Saskatchewan at 6%:  PST = $1,140 → $26,140 cash at closing
In every other province:               $25,000 cash at closing

The PST is the line item most likely to surprise a first-time buyer in one of the three taxed provinces. It is not large in absolute terms but it is real and unfinanced: buyers routinely arrive at the lawyer's office a thousand to two thousand dollars short because the tax was not part of the mortgage budget. The closing-costs calculator surfaces it as a separate line, and the CMHC calculator shows the PST as part of the Cash to close panel so it cannot be missed.

When to consider 20% down instead

Going from 19.99% down to 20% changes everything: CMHC insurance becomes optional rather than required. No premium. No PST on a premium that does not exist. That can be a meaningful chunk of money. The trade-off is the cash itself: 20% on a $700,000 home is $140,000, versus $105,000 at 15% down. An extra $35,000 of cash on hand is not free.

The order of decisions worth running through:

1. Do you have the $35,000 today? If yes, the math almost always favours putting it down rather than financing it via premium plus interest over 25 to 30 years.
2. If not, what is the alternative? Saving the extra $35,000 takes time. If the alternative is delaying the purchase by 18 to 30 months to save the difference, the rent you pay and the home-price appreciation (or decline) you absorb in the meantime usually outweighs the premium cost.
3. Will putting it all down leave you under-cushioned for the first year? Closing wipes out cash reserves; if 20% down leaves you with no emergency fund or no money for repairs, the smaller down payment plus premium is the safer call even though it is more expensive.

This is the kind of math the CalcNorth calculators are built for. Plug the same home into the mortgage calculator at 15% and 20% down. The 20%-down version skips CMHC entirely; the 15%-down version shows the premium and the PST line. The total cost over the amortization is the apples-to-apples comparison.

CMHC vs Sagen vs Canada Guaranty

Three insurers, one product, identical headline rates. The practical takeaway: as a borrower, you do not pick the insurer. The lender routes your application to whichever insurer's underwriting is most likely to approve. CMHC tends to write the bulk of routine cases. Sagen and Canada Guaranty often pick up applications CMHC declines for property type, debt-service ratio, credit history, or self-employment income. The premium you pay is the same either way.

Approximate transactional market shares as of late 2025: CMHC around 50%, Sagen around 30%, Canada Guaranty around 20%. The math in this post (and in the CalcNorth calculator) is labelled "CMHC" because that is what most people search for, but it applies to all three insurers identically.

The non-traditional down payment surcharge

One edge case worth flagging. CMHC's top-tier 90.01-95% LTV premium is 4.00% when the down payment comes from a traditional source: savings, an RRSP withdrawal via the Home Buyers' Plan, a gift from immediate family, or proceeds from the sale of another property. If the down payment is borrowed (an unsecured line of credit, a credit card, an unsecured personal loan), the rate jumps to 4.50%.

The reasoning traces back to CMHC's risk model: borrowers using borrowed money to fund a high-LTV down payment default at higher rates than borrowers using savings. The cmhc-calculator's "borrowed down payment" checkbox toggles between the two rates so you can see the exact difference.

A quick note on the 2026 GST/HST rebate

Separate from CMHC but adjacent to "buying a home in 2026": the First-Time Home Buyers' GST/HST rebate received Royal Assent on March 12, 2026. It offers eligible first-time buyers of newly- built homes a rebate of up to $50,000. It is administered by the Canada Revenue Agency, not CMHC, and applies only to new builds. For a first-time buyer of a new build with a high-ratio mortgage, three programs now stack: the 30-year insured amortization, the GST/HST rebate, and the Home Buyers' Plan withdrawal from RRSPs (up to $60,000 per person). That is a meaningfully different cost structure than the same buyer faced two years ago.

The shortlist

Five things to know going into a 2026 CMHC-insured purchase:

1. The insured-price cap is $1.5 million. Above that, you need at least 20% down.
2. Premium rates follow the LTV tier ladder: 4.00% at 95% LTV, 3.10% at 90%, 2.80% at 85%, all the way down to 0.60% at 65%.
3. 30-year amortization is available to first-time buyers (on any insured purchase) and to all buyers of newly-built homes, at a 0.20% premium surcharge.
4. PST on the premium is payable in cash at closing in Ontario (8%), Quebec (9%), and Saskatchewan (6%). It cannot be financed into the mortgage.
5. CMHC, Sagen, and Canada Guaranty publish identical premium rates. The lender chooses the insurer; you pay the same rate.

Run any specific scenario through the CMHC calculator for the dollar premium and PST, the mortgage calculator for the resulting payment, and the mortgage affordability calculator to see the price your income can actually support under the OSFI stress test.

Sources

• 2024 federal mortgage reforms (insured-price cap raised to $1.5M and 30-year insured amortizations for FTHB and new builds): Department of Finance Canada, Delivering the Boldest Mortgage Reforms in Decades (September 16, 2024).
• CMHC premium tier ladder and 0.20% extended-amortization surcharge: Canada Mortgage and Housing Corporation, Premium Information for Homeowner and Small Rental Loans.
• Multi-unit MLI premium reset effective July 14, 2025 (noted for completeness; does not affect owner-occupied buyers): CMHC, CMHC to Update Multi-Unit Mortgage Loan Insurance Premiums.
• PST on CMHC insurance, rates and provincial scope: Ratehub, PST on CMHC Insurance; cross-referenced against provincial revenue authorities.
• Three-insurer market shares and underwriting differences: True North Mortgage, CMHC vs Sagen vs Canada Guaranty.
• CMHC scale and 2024 portfolio data ($440 billion of insurance in force, 0.30% arrears rate): CMHC, CMHC releases 2024 Annual Report.
• First-Time Home Buyers' GST/HST rebate, Royal Assent March 12, 2026: Canada Revenue Agency administers the program; verify current eligibility and cap on canada.ca before applying.