Morty's Rate Radar
The underlying forces driving Canadian mortgage rates — the overnight rate, bond yields, inflation, and how they connect.
Want to understand what really drives mortgage rates?
Forget the bank ads — there are really only a few key numbers that matter. The Bank of Canada overnight rate sets monetary policy, the 5-year Government of Canada bond yield reflects where markets think rates are headed, the prime rate follows the BoC like clockwork, and CPI-median (the BoC's preferred core inflation measure) is the force behind it all. Let's break it down.
Key Indicators Dashboard
The fundamental numbers driving Canadian mortgage rates right now.
BoC Overnight Rate
2.75%
Policy rate
Prime Rate
4.95%
Big 6 banks
5-Year GoC Bond
2.68%
Benchmark yield
CPI-Median
2.40%
Core inflation (target: 2%)
How These Indicators Connect
Understanding the chain reaction from inflation to your mortgage rate.
Inflation: The Driving Force
The Bank of Canada has one primary mandate: keep inflation at 2% (within a 1–3% target band). They focus on CPI-median — a core measure that strips out extreme price swings — as their primary gauge. When CPI-median rises above target, the BoC raises the overnight rate to cool spending. When it falls back, they can cut. Everything else flows from this relationship.
The chain reaction:
CPI-median rises above 2% → BoC raises overnight rate → Prime rate increases (~2.2% above overnight) → Variable mortgage rates go up → Bond yields rise on inflation expectations → Fixed mortgage rates climb too
BoC Rate & Prime
The overnight rate is the BoC's primary policy tool, adjusted 8 times a year. The big banks set their prime rate about 2.2% above the overnight rate — this spread has been remarkably stable for decades. Variable mortgage rates are quoted as prime ± a discount.
How it flows:
BoC overnight rate → Prime rate (+ ~2.2%) → Your variable mortgage rate (prime ± discount)
5-Year Bond Yield
The 5-year Government of Canada bond yield is set by the open market — driven by inflation expectations, global capital flows, and investor sentiment. Lenders fund fixed mortgages in the bond market, so fixed rates track the bond yield closely (plus a lender spread of ~1.5–2%).
How it flows:
Inflation expectations → Bond yield moves → Your fixed mortgage rate (bond yield + ~1.5–2%)
Why does timing differ?
The BoC overnight rate changes on a fixed schedule — 8 announcements per year. But bond yields move every second of every trading day, driven by market expectations. That's why fixed rates sometimes move weeks before the BoC officially acts — the bond market is pricing in future expectations based on inflation data, employment reports, and global events.
Historical Trends
See how these indicators have moved together over the last 10 years.
The BoC overnight rate is the policy lever — when it moves, the prime rate follows within days (maintaining a ~2.2% spread). The 5-year bond yield moves independently based on market expectations for future growth and inflation.
Notice how the bond yield often moves before the BoC acts — the bond market prices in expectations ahead of official policy changes. During 2022, bond yields spiked first, then the BoC followed with aggressive rate hikes.
Data source: Bank of Canada Valet API. CPI-median is the BoC's preferred core inflation measure (year-over-year change).
What to Watch
The signals that tell you where rates might head next.
Not financial advice or a prediction
Past performance is not indicative of future results. Markets can change fast and unpredictably. This page is educational context only — always speak to a licensed mortgage professional before making financial decisions.
If inflation stays near target...
The BoC has room to continue cutting or hold steady. The overnight rate and prime would trend lower, easing variable mortgages. Bond yields would stay contained, keeping fixed rates reasonable. This is the scenario borrowers hope for.
Watch for: CPI-median readings at or below 2%, stable employment, moderate GDP growth.
If inflation picks back up...
The BoC would pause or reverse cuts, pushing the overnight rate and prime back up. Bond yields would spike on inflation fears, dragging fixed rates higher too. This is what caught many borrowers off guard in 2022.
Watch for: CPI-median readings above 3%, hot employment data, commodity price spikes, or global trade disruptions.
Key dates to watch
The Bank of Canada announces rate decisions 8 times per year. CPI-median data is released monthly by the BoC. Check the BoC schedule and the BoC inflation indicators to stay ahead of rate moves.
Not financial advice or a prediction
Past performance is not indicative of future results. Markets can change fast and unpredictably. This page is educational context only — always speak to a licensed mortgage professional before making financial decisions.
Data sourced from the Bank of Canada Valet API (series V39079, V80691625, BD.CDN.5YR.DQ.YLD, CPI_MEDIAN). This page is for educational purposes only and does not constitute financial advice.