Apr 10, 2026
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When most Canadians hear that fixed mortgage rates are moving, they look to the Bank of Canada. That's understandable — the central bank's overnight rate is the most talked-about lever in the country's housing finance system. But it's not the only one.
There's a second program most homeowners have never heard of: Canada Mortgage Bonds (CMBs). And in January 2026, the Bank of Canada confirmed that the federal government would continue buying up to $30 billion in CMBs throughout 2026 (1). That's real money, moving through a market that directly influences what you pay on a fixed-rate mortgage.
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Here's what CMBs do and why these matter if you're renewing or shopping for a mortgage in 2026.
What is a Canada Mortgage Bond?
When a Canadian lender gives you a fixed-rate mortgage, it doesn't simply hold that loan on its books forever. Instead, it sells these insured mortgage debts to the Canada Housing Trust (CHT). This frees up capital for your lender to make more mortgage loans available to borrowers.
The CHT will then bundle these mortgages and sell these packages of debt to big investors, such as pension funds, insurance companies and other institutions looking for long-term, stable returns. These packages of debt sold by CHT are known as Canada Mortgage Bonds.
Because CMBs carry a guarantee from the Canada Mortgage and Housing Corporation (CMHC), they are considered low-risk investments that trade at yields very close to Government of Canada bond yields (2).
And that’s the key: The yield investors demand on a CMB is directly connected to the fixed-rate mortgage your lender will offer you. That’s because lenders typically price their fixed-rate mortgages using a simple spread:
- Fixed Mortgage Rate = CMB Yield + Lender Spread
Where the yield covers the base cost of the money and the spread covers the lender’s overhead, marketing, risk, and their profit margin.
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Get StartedWhy does the government buy CMBs?
The federal government first announced its intention to buy CMBs in the 2023 Fall Economic Statement, with purchases beginning in February 2024. In that first year, the government purchased $29 billion of the $58 billion in fixed-rate CMBs issued — roughly 50% of all issuances. It bought another $29 billion in 2025. As of September 30, 2025, total government CMB holdings had reached $50.8 billion (3), according to the Parliamentary Budget Officer (PBO).
By committing to purchase up to $30 billion in CMBs each year, the government acts as a reliable large buyer in the primary market. That steady demand has helped narrow the yield spread between CMBs and Government of Canada bonds, reducing what lenders pay to access mortgage funding.
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In practical terms, this means current fixed mortgage rates are modestly lower due to the federal government's purchase of CMBs. But this is not a direct subsidy. Your lender still sets its own rate based on that bond yield plus a spread that covers operating costs, risk and profit. But the CMB program affects the floor that the spread is built on.
How does this affect what you pay on a fixed mortgage?
Watching the Bank of Canada's overnight rate tells you where variable mortgage rates are heading. But if you're renewing into a fixed rate — or deciding between fixed and variable — the 5-year Government of Canada bond yield is a more useful signal.
That’s because fixed mortgage rates are priced as a spread above Government of Canada bond yields for the matching term — typically the 5-year yield for a 5-year fixed mortgage. When CMB yields fall, lenders' funding costs fall, which creates room for lower fixed mortgage rates.
But in early 2026, the relationship between yields and rates became harder to track. Bond yields moved sharply in recent weeks, driven by rising oil prices and geopolitical uncertainty, pushing fixed mortgage rates up by as much as 30 basis points in a short period. As of late March, the lowest insured 5-year fixed mortgage rate available to Canadians was around 3.89% to 3.94%, up from 3.79% in February (4).
That kind of move can happen even when the Bank of Canada holds its policy rate steady — as it did in March 2026, keeping it at 2.25%.
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It's also a reminder that fixed and variable rates are driven by different forces, and that bond market volatility can affect your renewal independently of what the central bank does.
Read more: The ultra-rich are bailing on volatile stocks right now — these 4 shockproof assets are their new safe havens
What could change — and what to watch for
The CMB program is not unlimited. The PBO has noted that further expanding purchases beyond $30 billion could risk undermining the functioning of the CMB market itself, which investors use as a risk management tool. The government has so far maintained that annual ceiling.
Budget 2025 did announce that the overall CMB issuance limit would increase from $60 billion to $80 billion starting in 2026, but government purchases would remain capped at $30 billion, allowing the private market access to the additional capacity (5).
For borrowers, what matters most is the direction of the 5-year Government of Canada bond yield. When yields rise — as they have recently — fixed rates follow, typically within days. When yields fall and stabilize, lenders can lower fixed rates, but rarely all at once.
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What to do if you're renewing in 2026
The CMB program is structural, not something you can act on directly. But understanding the bond-rate link helps you make sharper decisions at renewal time. To help, use these four steps when approaching your mortgage renewal date:
- Watch the 5-year Government of Canada bond yield — it's a leading indicator of where fixed rates are heading, often days before your bank moves its posted rate
- Ask your broker whether the spread between bond yields and fixed mortgage rates is wider than normal — if lenders are pricing in extra risk, there may be room to negotiate or shop around
- Don't assume the Bank of Canada's policy rate tells the whole story — variable and fixed rates are driven by different benchmarks and can move in different directions simultaneously
- Consider timing your renewal carefully — if bond yields are elevated, a shorter fixed term may make sense if you expect them to ease, whereas locking in during a period of yield stability gives you more predictability
The government's CMB program is not a guarantee that your fixed rate will stay low. Bond markets can still rise sharply, as 2026 has already shown. But knowing that Ottawa is in the market as a significant buyer gives context for why fixed rates have remained relatively contained — and what would need to change for that to shift.
Article sources
We rely only on vetted sources and credible third-party reporting. For details, see our editorial ethics and guidelines.
Bank of Canada (1, 2); Parliamentary Budget Officer (3); True North Mortgage (4); Government of Canada — Budget 2025 (5)
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Romana King is the Senior Editor at Money.ca. She writes for various publications, and her book -- House Poor No More: 9 Steps That Grow the Value of Your Home and Net Worth -- continues to be an Amazon bestseller. Since its publication in November 2021, this book has won five awards, including the New York CPA Society's Excellence in Financial Journalism (EFJ) Book Award in 2022.
