Mortgage solution
The rate follows prime, up and down. What matters is what your payment does when it moves, and what it costs to get out.

A variable rate is expressed against the lender’s prime rate: prime minus a discount, or plus a premium. The spread is fixed for the term; it is prime that moves, following the Bank of Canada’s decisions. The rate you pay therefore changes every time prime changes, without you signing anything.
With an adjustable payment, the instalment rises or falls at each rate change: the budget moves, but the amortization holds. With a fixed payment on a variable rate, the instalment stays the same and it is the interest share that grows when the rate rises: up to the trigger rate, where the payment no longer covers the interest and the lender requires an adjustment. The second structure feels more comfortable; it hides the risk rather than removing it.
The penalty for breaking a variable rate is generally three months’ interest, with no rate differential. For someone who might sell or refinance before maturity, that is often the deciding argument, more than today’s rate. Most lenders also let you convert to a fixed rate mid-term without penalty, but at the fixed rate they offer that day, not today’s.
Qualification uses the same stress-test rate as a fixed. The useful question is elsewhere: if prime rose by one point, would the new payment fit your budget without cutting anything? If the answer is no, a variable exposes you to a forced decision at the worst moment. If it is yes, the flexibility and the smaller penalty work in your favour.
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Only if your lender’s prime moves, and depending on your structure: with an adjustable payment, yes; with a fixed payment on a variable rate, the instalment stays the same and the interest share is what changes.
With most lenders, yes, mid-term, but at the fixed rate offered on the day of conversion, for a term at least as long as what remains. The contract sets the conditions.
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Buying, renewing, refinancing or an unusual situation: describe where you are at, even if it is still vague. Mathieu replies with the next steps and the documents to gather.