Should You Lock In Your Variable Rate? Canada Break-Even Analysis

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Calculate whether converting to fixed actually saves money — including the penalty cost

The Lock-In Question: When rates rise, variable-rate borrowers often wonder whether to lock into a fixed rate. The answer depends on how much rates would need to rise to justify paying a penalty and accepting the higher fixed rate. This calculator shows your break-even point.

Variable-to-Fixed Lock-In Break-Even Calculator

Find Your Lock-In Break-Even Point

Current Mortgage Balance ($) Current Variable Rate (%) Available Fixed Rate to Lock Into (%) Months Remaining on Current Term Remaining Amortization (years)

Understanding the Lock-In Decision

The decision to lock a variable rate into a fixed rate is one of the most common mortgage questions in Canada, especially during periods of rate volatility. The math is not as simple as comparing the two rates — you must factor in the penalty, the rate differential, and your timeline.

The Penalty for Locking In

If you have a variable-rate mortgage and want to convert to fixed, most lenders allow this — but at a cost. Typically, the penalty is 3 months' interest on your current variable rate. On a $450,000 balance at 4.20%, that's approximately $4,725. This is money you pay today in exchange for rate certainty going forward. You need to recoup this penalty through savings on the fixed rate before the lock-in makes financial sense.

The Rate Differential Matters

If your variable rate is 4.20% and the fixed rate you can lock into is 4.44%, you're paying 0.24% more per year to lock in. On $450,000, that's about $1,080 per year in extra interest. Your $4,725 penalty takes approximately 4.4 years to recoup — but if you only have 3 years left in your term, locking in makes you worse off (mathematically) compared to staying variable at the same rate. The break-even analysis changes dramatically if rates rise after you lock in.

When Locking In Makes Sense

The fixed rate is close to or below your current variable rate
You have a long remaining term and expect rates to rise significantly
Your financial situation has changed and you can no longer absorb payment risk
You have a major life event (starting a family, job change) that makes payment predictability valuable
The fixed rate available represents historically good value

When Staying Variable Makes Sense

Fixed rates are materially higher than variable
The Bank of Canada is in an easing cycle and more cuts are expected
You have the financial cushion to absorb potential rate increases
You plan to sell or significantly change your mortgage before term end
The break-even point is longer than your remaining term

The Bank of Canada Context (2026)

The Bank of Canada reduced its policy rate multiple times through late 2024 and into 2025, responding to slowing inflation and economic growth concerns. As of early 2026, the overnight rate sits around 3.0%–3.25%, translating to a prime rate of approximately 4.95%–5.25%. Variable-rate holders who signed mortgages at prime minus significant discounts in 2023–2024 are now seeing attractive effective rates. Whether further cuts materialize depends on inflation, the global economy, and trade conditions — all uncertain.

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Last updated: March 2026. Calculations use Canadian semi-annual compounding. Not financial advice.