●Insured A files run against firm ceilings (39% GDS / 44% TDS under programs like CMHC's) with a qualifying rate that's the greater of contract-plus-2% or 5.25% for federally regulated lenders.
●B and alternative lenders can go meaningfully wider on GDS/TDS, but wider isn't free — it usually pairs with rate, fee or LTV trade-offs elsewhere in the file.
●Not every B lender uses OSFI's qualifying rate — it depends on how that specific lender is regulated.
The A baseline, so you know what 'wider' means
The reference point this module compares against: CMHC's insured programs cap GDS at 39% and TDS at 44%, and OSFI's minimum qualifying rate for federally regulated lenders is the greater of the mortgage's contract rate plus 2%, or 5.25%. That's the tight end of the spectrum this module is measuring "wider" against.
Why B lenders can go wider
A lender accepting a thinner ratio cushion is accepting more repayment risk on paper, and it prices that risk elsewhere in the file — rate, fee, LTV — rather than through a hard ratio ceiling the way an insurer does. This course teaches that trade-off directionally rather than quoting a specific number, because the exact ceiling any one lender uses is its own policy and shifts over time.
Does the stress test even apply?
This is the regulatory nuance worth getting exactly right. OSFI's Guideline B-20 and its minimum qualifying rate apply specifically to federally regulated financial institutions. Some B lenders are federally chartered trust companies or banks and genuinely are subject to it; provincially regulated credit unions and private lenders sit outside OSFI's authority entirely and may set their own qualifying approach. A broker should know which kind of institution a given file is going to, not assume either way by default.
Wider ratios still have a ceiling somewhere
Don't over-read "wider" as "unlimited." Every lender has some point past which a file simply doesn't work regardless of price, because at a certain level of debt service the borrower's actual ability to make the payment — not just the ratio on paper — becomes the real question the file has to answer.
Reading a wide-ratio approval correctly
A wide-ratio B approval isn't a sign the lender is being careless — it's a sign the lender priced for the extra risk elsewhere in the deal. Walk the client through what that trade-off actually costs so a wide-ratio approval doesn't feel like a free pass with no strings attached.
Knowledge checkUnanswered
Why might one B lender approve a file at ratios that would fail under insured A guidelines, while another B lender declines the same file?
AOnly one of the two lenders is following the law.
BWider debt-service tolerance is a risk-pricing choice each lender makes on its own, often paired with rate, fee or LTV trade-offs — and not every lender sets that tolerance the same way.
CB lenders are required by OSFI to use identical ratio ceilings.
DThe stress test makes ratio outcomes identical everywhere, regardless of lender.
Ratio tolerance at B is a business decision each lender makes, priced into the rest of the deal, and it isn't standardized the way insured A ratios are. The "required by OSFI" option is the tempting mistake, since B-20 sounds like it should apply universally — but OSFI's authority reaches federally regulated institutions specifically, not every lender operating in the B and alternative space.
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