You have saved your down payment. You have been pre-approved. You have found a home you love. And then — sometimes only days before closing — your lawyer or mortgage broker hands you a breakdown of closing costs that includes a number you were not expecting.
CMHC mortgage insurance. Plus Ontario RST on top of it. Together, they can add tens of thousands of dollars to the cost of buying your home — and unlike most closing costs, the RST portion must be paid in cash on closing day. You cannot roll it into your mortgage.
This is one of the most commonly missed hidden costs of homeownership for first-time buyers in Ontario. This guide explains exactly what CMHC insurance is, how much it costs in 2026, what Ontario’s RST charge adds to that, and — critically — how to reduce or eliminate both.
Who Needs to Read This?
- First-time home buyers in Ontario purchasing with less than 20% down payment
- Buyers who have been pre-approved but have not yet calculated their full closing costs
- Anyone purchasing a home priced between $500,000 and $1.5 million in Ontario
- Buyers exploring 30-year amortization options after the December 2024 rule changes
- Parents or family members co-signing or gifting a down payment to a first-time buyer
- Anyone who has heard of CMHC insurance but is unclear about what RST means on their closing statement
What Is CMHC Mortgage Insurance — And Why Is It Required?
CMHC mortgage insurance — formally called mortgage default insurance — is a mandatory insurance premium that protects your lender (not you) if you default on your mortgage. It is required by Canadian law for any mortgage with a loan-to-value ratio greater than 80% — meaning any home purchase where the buyer puts down less than 20% of the purchase price.
CMHC (Canada Mortgage and Housing Corporation) is the federal Crown corporation that provides this insurance alongside two private-sector providers: Sagen and Canada Guaranty. All three charge the same premium rates, which are set federally.
While CMHC insurance protects the lender — not the buyer — it actually benefits buyers by allowing them to purchase a home with as little as 5% down and qualify for the same low interest rates as buyers with larger down payments. Without it, lenders would either require 20% down or charge significantly higher rates for high-LTV mortgages.
Sources: Niagara Association of REALTORS® / CREA Statistics (February 2026); SellsNiagara Spring 2026 Update; NRC Realty January 2026 Statistics
What Are the CMHC Insurance Premium Rates in 2026?
The premium rate is a percentage of your total mortgage amount — not your purchase price — and depends on how much you put down:
| Down Payment | Loan-to-Value Ratio | CMHC Premium Rate | Additional Premium (30-yr Amortization) |
|---|---|---|---|
| 5% – 9.99% | 90.01% – 95% | 4.00% | +0.20% = 4.20% |
| 10% – 14.99% | 85.01% – 90% | 3.10% | +0.20% = 3.30% |
| 15% – 19.99% | 80.01% – 85% | 2.80% | +0.20% = 3.00% |
| 20% or more | 80% or less | No insurance required | N/A |
*The +0.20% surcharge for 30-year amortization applies to first-time buyers and new construction only, introduced December 15, 2024. Source: CMHC
What Is Ontario RST on CMHC Insurance — And Why Does It Exist?
Here is the cost that catches most first-time buyers completely off guard: Ontario’s Retail Sales Tax (RST).
When Ontario harmonised its provincial sales tax into the HST, nearly all goods and services moved to HST. However, insurance premiums — including CMHC mortgage insurance — were specifically excluded from HST and kept under the old Retail Sales Tax framework at a rate of 8%.
This 8% RST is applied to your CMHC premium amount and must be paid in full in cash on your closing day. Unlike the CMHC premium itself — which can be rolled into your mortgage — the RST cannot be added to your mortgage under any circumstances. It must come from your own funds at closing.
Ontario is one of only three provinces that charge provincial tax on CMHC premiums: Ontario (8% RST), Quebec (9% QST), and Saskatchewan (6% PST). Buyers in all other provinces do not pay this tax.
How Much Will CMHC Insurance and Ontario RST Actually Cost You? Real Examples
Let’s make this concrete with real purchase price scenarios relevant to the Ontario and Niagara markets in 2026:
| Purchase Price | Down Payment | Down % | Mortgage Amount | CMHC Premium | Ontario RST (8%) | Cash Needed at Closing |
|---|---|---|---|---|---|---|
| $500,000 | $25,000 | 5% | $475,000 | $19,000 (4.00%) | $1,520 | $1,520 |
| $600,000 | $35,000 | 5.83% | $565,000 | $22,600 (4.00%) | $1,808 | $1,808 |
| $700,000 | $45,000 | 6.43% | $655,000 | $26,200 (4.00%) | $2,096 | $2,096 |
| $750,000 | $75,000 | 10% | $675,000 | $20,925 (3.10%) | $1,674 | $1,674 |
| $800,000 | $80,000 | 10% | $720,000 | $22,320 (3.10%) | $1,786 | $1,786 |
| $900,000 | $90,000 | 10% | $810,000 | $25,110 (3.10%) | $2,009 | $2,009 |
| $1,000,000 | $100,000 | 10% | $900,000 | $25,200 (2.80%) | $2,016 | $2,016 |
| $500,000 | $25,000 | 5% + 30yr | $475,000 | $19,950 (4.20%) | $1,596 | $1,596 |
Note: Down payment minimum rules apply for homes $500K–$1.5M: 5% on first $500K + 10% on the remainder. Homes over $1.5M require 20% down and are not CMHC-insurable. Sources: CMHC, WOWA, Ratehub
How Does the Minimum Down Payment Work for Homes Over $500,000?
As of December 15, 2024, CMHC insurance is now available on homes up to $1.5 million — up from the previous $1 million cap. But the minimum down payment rules are tiered and often misunderstood:
- Homes priced at $500,000 or less: Minimum 5% down on the full amount
- Homes priced between $500,001 and $1,499,999: 5% on the first $500,000 PLUS 10% on everything over $500,000
- Homes priced at $1,500,000 or more: Minimum 20% down — CMHC insurance not available at this price point
Example: For a $700,000 home, the minimum down payment is: (5% x $500,000) + (10% x $200,000) = $25,000 + $20,000 = $45,000 minimum.
This matters significantly for Niagara buyers entering the $600K–$900K market and GTA buyers stretching to the $1M–$1.5M threshold. Read our complete first-time buyer guide: https://quantumteamrealty.com/first-time-home-buyer-incentives-ontario-2026/
What Is the 30-Year Amortization CMHC Surcharge?
As of December 15, 2024, first-time home buyers and those purchasing newly-built homes can opt for a 30-year amortization instead of the standard 25 years — helping reduce monthly payments. However, this comes with a 0.20% surcharge on top of the standard CMHC premium rate.
So instead of paying 4.00% on a 5% down purchase, you would pay 4.20%. On a $475,000 mortgage, that is an extra $950 in CMHC premium — plus the 8% Ontario RST on that additional amount. For many buyers, the lower monthly payment from 30-year amortization still justifies this surcharge, but you need to know it exists before closing day.
Can You Add CMHC Insurance and RST to Your Mortgage?
| Cost Component | Can Be Added to Mortgage? | Must Be Paid in Cash at Closing? |
|---|---|---|
| CMHC Insurance Premium | Yes — added to mortgage principal | No (optional to pay upfront) |
| Ontario RST (8% on premium) | No — cannot be mortgaged | Yes — must be paid in cash |
| Land Transfer Tax | No | Yes — must be paid at closing |
| Legal / Lawyer Fees | No | Yes — must be paid at closing |
| Home Inspection Fee | No | Yes — typically paid at inspection |
This is why many first-time buyers are caught short at closing. The CMHC premium itself is painless — it gets added to your mortgage and paid over time. But the RST hits your bank account on closing day and cannot be avoided, financed, or deferred.
How Can You Reduce or Eliminate CMHC Insurance Costs?
There are only a few legitimate ways to reduce or avoid CMHC insurance entirely:
Option 1 — Put Down 20% or More
The cleanest solution: a 20% down payment eliminates the CMHC requirement entirely, saving you thousands in premiums and eliminating the RST obligation. On a $700,000 home, that means $140,000 down — a significant savings target but the most cost-effective long-term approach.
Option 2 — Increase Your Down Payment to the Next Premium Tier
If you are close to a threshold — say, 9.5% down — consider stretching to 10% to drop from the 4.00% tier to the 3.10% tier. On a $600,000 mortgage, that saves roughly $5,400 in premium — and the RST reduction that comes with it. Sometimes a small additional contribution at closing produces disproportionate savings.
Option 3 — First-Time Buyer Programs and Incentives
Ontario’s first-time home buyer programs — including the Land Transfer Tax rebate and federal RRSP Home Buyers’ Plan — can help you build a larger down payment faster, potentially reaching the 20% threshold sooner. Explore all available incentives: https://quantumteamrealty.com/first-time-home-buyer-incentives-ontario-2026/
Option 4 — Buy in a Lower Price Market Like Niagara
Purchasing a home at $571,000 in Niagara rather than $938,000 in the GTA dramatically reduces both your mortgage amount and your CMHC premium, even at the same down payment percentage. A 5% down purchase in Niagara generates roughly half the CMHC premium of the same purchase in Toronto — and less than half the Ontario RST owed at closing. See current Niagara listings: https://quantumteamrealty.com/properties-for-sale-in-niagara-2026/
How Does CMHC Insurance Fit Into Your Total Closing Costs in Ontario?
First-time buyers should budget for total closing costs of approximately 1.5% to 4% of their purchase price on top of their down payment. Here is a realistic breakdown for a $650,000 home purchase in Ontario with 5% down:
| Closing Cost Item | Estimated Amount | Notes |
|---|---|---|
| CMHC Insurance Premium | $24,700 (4.00%) | Added to mortgage — not required in cash |
| Ontario RST on CMHC | $1,976 (8%) | MUST be paid in cash at closing |
| Ontario Land Transfer Tax | ~$8,475 | Paid at closing; rebate up to $4,000 |
| Legal / Notary Fees | $1,500 – $2,500 | Paid at closing |
| Home Inspection | $400 – $600 | Paid at time of inspection |
| Title Insurance | $200 – $400 | Typically paid at closing |
| Mortgage Appraisal Fee | $300 – $500 | Sometimes covered by lender |
| Moving Costs | $1,000 – $3,000 | Variable |
| Total Cash Needed at Closing | ~$14,000 – $18,000 | Excluding mortgage and CMHC premium |
For the full breakdown of hidden homeownership costs beyond CMHC, read: https://quantumteamrealty.com/hidden-costs-homeownership-ontario-beyond-mortgage/
Land transfer tax guide: https://quantumteamrealty.com/land-transfer-tax-toronto-vs-niagara/
Do Not Let Hidden Costs Derail Your Home Purchase
CMHC insurance and Ontario RST are manageable costs — but only if you know about them in advance. The buyers who get caught off guard are those who calculate their down payment and stop there, without accounting for the cash they need at closing on top of it.
At Quantum Team Realty, we make sure every buyer we work with walks into their transaction fully informed — with a clear picture of every dollar involved, from pre-approval to closing day. We can also help you explore whether a Niagara purchase makes your down payment go further and reduces your CMHC exposure from the start.
Explore first-time buyer incentives: https://quantumteamrealty.com/first-time-home-buyer-incentives-ontario-2026/
Full hidden costs guide: https://quantumteamrealty.com/hidden-costs-homeownership-ontario-beyond-mortgage/
Browse Niagara properties: https://quantumteamrealty.com/properties-for-sale-in-niagara-2026/
Talk to our team: https://quantumteamrealty.com/trusted-realtors-niagara/
Frequently Asked Questions
What is CMHC mortgage insurance and is it mandatory in Canada?
CMHC mortgage insurance (formally mortgage default insurance) is mandatory for any home purchase in Canada where the down payment is less than 20%. It protects the lender against default and is required by law under the National Housing Act. Premium rates range from 2.80% to 4.00% of the mortgage amount.
What is Ontario RST on CMHC insurance and how much is it?
Ontario’s Retail Sales Tax (RST) applies to CMHC insurance premiums at a rate of 8%. It is a legacy tax that survived Ontario’s HST harmonisation and specifically applies to insurance premiums. The RST must be paid in full in cash on your closing date and cannot be added to your mortgage.
How much is CMHC insurance on a $600,000 home in Ontario?
With 5% down on a $600,000 home, your mortgage is approximately $565,000. The CMHC premium at 4.00% is $22,600. Ontario RST at 8% on that premium is $1,808 — which must be paid in cash at closing. The $22,600 premium itself is added to your mortgage.
Can I add CMHC insurance to my mortgage?
Yes — the CMHC insurance premium itself can be added to your mortgage principal. However, Ontario’s 8% RST on that premium cannot be mortgaged and must be paid in cash at closing. This is the portion most first-time buyers are unprepared for.
How do I avoid paying CMHC insurance?
The only way to avoid CMHC insurance entirely is to put down 20% or more of the purchase price. You can also reduce the premium amount by putting down more to reach a lower premium tier — for example, going from 9.5% to 10% down drops from 4.00% to 3.10%, saving thousands on a $600,000+ purchase.
Does the 30-year amortization option affect CMHC premiums?
Yes. First-time buyers and new construction buyers who choose a 30-year amortization (available since December 15, 2024) pay an additional 0.20% on their CMHC premium rate — so 4.00% becomes 4.20% at the 5% down tier. The Ontario RST also applies to this higher premium amount.
What is the maximum home price for CMHC insurance in 2026?
As of December 15, 2024, CMHC insurance is available on homes priced up to $1.5 million. Homes priced at or above $1.5 million require a minimum 20% down payment and are not eligible for CMHC insurance.
Is the CMHC insurance premium tax deductible in Ontario?
No. The CMHC insurance premium is not tax deductible for owner-occupied residential properties in Canada. It is simply an additional cost of purchasing with less than 20% down.
How much cash do I actually need at closing as a first-time buyer in Ontario?
Beyond your down payment, budget for: Ontario RST on CMHC (8% of your premium — must be cash), Ontario Land Transfer Tax (minus first-time buyer rebate up to $4,000), legal fees ($1,500–$2,500), title insurance, and inspection fees. Total cash reserve beyond down payment is typically $12,000–$20,000 depending on purchase price. Read the full guide: https://quantumteamrealty.com/hidden-costs-homeownership-ontario-beyond-mortgage/
Is CMHC insurance cheaper in Niagara than Toronto?
Yes — in pure dollar terms. Because home prices in Niagara are lower, your mortgage amount is lower, and therefore your CMHC premium and the Ontario RST on that premium are both lower. A 5% down purchase at $571,000 in Niagara generates roughly half the CMHC premium cost of a similar purchase in the GTA. See current Niagara listings: https://quantumteamrealty.com/properties-for-sale-in-niagara-2026/
Sunny Chadha
Sunny Chadha is the Co-Founder of Quantum Team Realty and brings over 15 years of experience in Niagara real estate. He is passionate about helping clients make informed decisions and sharing his deep knowledge of the local market.
Published by Quantum Team Realty | March 2026
Sunny Chadha & Lal Rishi — Niagara Falls & GTA Real Estate
quantumteamrealty.com
hidden costs homeownership Ontario buying a home Ontario 2026 Ontario land transfer tax CMHC insurance Ontario property tax Niagara Falls home maintenance costs Ontario Quantum Team Realty first time buyer Ontario closing costs Ontario condo fees GTA
Internal Links: First-Time Buyer Guide, Listings, Contact, Pre-Construction Page[ppl-ai-file-upload.s3.amazonaws]
External Links: MPAC.ca (property assessments), CMHC.ca (insurance premiums), Ontario.ca (land transfer tax)[ppl-ai-file-upload.s3.amazonaws]
