OSFI's New LTI Framework Changed How Lenders Approve High-Leverage Mortgages
The last time your client asked why their application stalled, you probably said "stress test" and left it there. But there's a second constraint most borrowers never hear about. Starting in fiscal Q1 2025, OSFI imposed a portfolio-level loan-to-income limit on federally regulated lenders, capping the share of mortgages they can hold above 4.5 times borrower income. This isn't a hard ceiling for any individual borrower, but when a lender nears its portfolio cap, higher-LTI applications face tougher scrutiny or outright rejection. Most clients have never heard the term "LTI limit." That doesn't stop it from affecting their file.
What OSFI actually changed
The loan-to-income framework limits how much high-leverage lending a bank can carry in its portfolio. OSFI's guidance, which took effect at the start of lenders' fiscal 2025 (November 2024 for the largest institutions), caps the proportion of uninsured mortgages a lender can hold above roughly 4.5 times borrower income. The limit applies to the lender's book, not to any single borrower. A household earning $100,000 might still qualify for a mortgage well above $450,000 if the lender has room under its cap and the borrower passes the stress test, but higher-LTI applications now face added friction.
The cap applies to uninsured mortgages only. If your client is putting down 20% or more, they face this constraint. Under 20%, they're in CMHC-insured territory, and the cap doesn't bind. The stress test still does, but that's a separate calculation, the Bank of Canada's qualifying rate, currently the contract rate plus two percentage points or 5.25%, whichever is higher.
Self-employed borrowers typically face a 15% gross-up applied to a two-year average of reported income, along with stricter documentation: two years of Notices of Assessment, full T1 Generals (not just line 150), and CRA statements confirming no arrears. Commission and variable income is generally averaged over two years when it represents a significant portion of total pay. Bonus income without a consistent multi-year history often doesn't count. If your client is a realtor who had a strong 2025 but a weak 2024, the two-year average can pull their qualifying income down. If they're a sales VP whose comp is heavily variable, a large portion of their stated income may not be recognized for qualifying purposes.
Who this helps and who it doesn't
Salaried households with stable income and low non-mortgage debt benefit most when lenders have room under their LTI portfolio cap. A software engineer earning $120,000 with minimal other debt can potentially qualify for a larger mortgage than someone whose income is variable or whose lender has already hit its high-LTI limit, assuming they pass the stress test. That's the best case.
It doesn't help the self-employed nearly as much as the headlines suggest. The gross-up sounds generous until you see the underwriting scrutiny that comes with it. Two years of Notices of Assessment. Full T1 Generals, not just line 150. CRA statements confirming no arrears. A lot of self-employed borrowers who thought they'd gained $84,000 in room are finding out they lost income recognition instead.
Variable-income earners, salespeople, commissioned staff, freelancers with contract stacking, are the group taking the biggest hit. The two-year averaging rule is new, and it's being applied retroactively to files that were already in underwriting when the guidance dropped. If your client's 2024 was soft and their 2025 was strong, the averaging pulls their qualifying income down below what it was under the old rules, even with a higher cap.
What you tell the client
Run the numbers before the application. Don't assume a higher cap means easier approval. For salaried clients with stable two-year income, the 6.09× threshold is a real expansion. For everyone else, the tighter income rules are doing more work than the raised limit.
If your client is self-employed, get the documents in order now: two years of NOAs, business financials if they're incorporated, proof of CRA compliance. If they're commissioned or bonus-heavy, pull two years of pay stubs and T4s. The 15% gross-up and the two-year average stack against each other, and the file that looked clean in August may not clear in September.
The LTI cap isn't the rate. It's not the stress test. It's the ceiling most borrowers don't know exists until they're already against it. Now it's higher, but the floor under income just got raised too. Run both sides of the math before you quote a number.
The last time your client asked why their application stalled, you probably said "stress test" and left it there. But there's a second constraint most borrowers never hear about. Starting in fiscal Q1 2025, OSFI imposed a portfolio-level loan-to-income limit on federally regulated lenders, capping the share of mortgages they can hold above 4.5 times borrower income. This isn't a hard ceiling for any individual borrower, but when a lender nears its portfolio cap, higher-LTI applications face tougher scrutiny or outright rejection. Most clients have never heard the term "LTI limit." That doesn't stop it from affecting their file.
What OSFI actually changed
The loan-to-income framework limits how much high-leverage lending a bank can carry in its portfolio. OSFI's guidance, which took effect at the start of lenders' fiscal 2025 (November 2024 for the largest institutions), caps the proportion of uninsured mortgages a lender can hold above roughly 4.5 times borrower income. The limit applies to the lender's book, not to any single borrower. A household earning $100,000 might still qualify for a mortgage well above $450,000 if the lender has room under its cap and the borrower passes the stress test, but higher-LTI applications now face added friction.
The cap applies to uninsured mortgages only. If your client is putting down 20% or more, they face this constraint. Under 20%, they're in CMHC-insured territory, and the cap doesn't bind. The stress test still does, but that's a separate calculation, the Bank of Canada's qualifying rate, currently the contract rate plus two percentage points or 5.25%, whichever is higher.
Self-employed borrowers typically face a 15% gross-up applied to a two-year average of reported income, along with stricter documentation: two years of Notices of Assessment, full T1 Generals (not just line 150), and CRA statements confirming no arrears. Commission and variable income is generally averaged over two years when it represents a significant portion of total pay. Bonus income without a consistent multi-year history often doesn't count. If your client is a realtor who had a strong 2025 but a weak 2024, the two-year average can pull their qualifying income down. If they're a sales VP whose comp is heavily variable, a large portion of their stated income may not be recognized for qualifying purposes.
Who this helps and who it doesn't
Salaried households with stable income and low non-mortgage debt benefit most when lenders have room under their LTI portfolio cap. A software engineer earning $120,000 with minimal other debt can potentially qualify for a larger mortgage than someone whose income is variable or whose lender has already hit its high-LTI limit, assuming they pass the stress test. That's the best case.
It doesn't help the self-employed nearly as much as the headlines suggest. The gross-up sounds generous until you see the underwriting scrutiny that comes with it. Two years of Notices of Assessment. Full T1 Generals, not just line 150. CRA statements confirming no arrears. A lot of self-employed borrowers who thought they'd gained $84,000 in room are finding out they lost income recognition instead.
Variable-income earners, salespeople, commissioned staff, freelancers with contract stacking, are the group taking the biggest hit. The two-year averaging rule is new, and it's being applied retroactively to files that were already in underwriting when the guidance dropped. If your client's 2024 was soft and their 2025 was strong, the averaging pulls their qualifying income down below what it was under the old rules, even with a higher cap.
What you tell the client
Run the numbers before the application. Don't assume a higher cap means easier approval. For salaried clients with stable two-year income, the 6.09× threshold is a real expansion. For everyone else, the tighter income rules are doing more work than the raised limit.
If your client is self-employed, get the documents in order now: two years of NOAs, business financials if they're incorporated, proof of CRA compliance. If they're commissioned or bonus-heavy, pull two years of pay stubs and T4s. The 15% gross-up and the two-year average stack against each other, and the file that looked clean in August may not clear in September.
The LTI cap isn't the rate. It's not the stress test. It's the ceiling most borrowers don't know exists until they're already against it. Now it's higher, but the floor under income just got raised too. Run both sides of the math before you quote a number.
Sources
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