A-lenders decline a file for a reason — a credit score under 700, a debt ratio past 39/44, self-employed income that doesn't show cleanly on two years of tax returns, or less than two years of employment history. B lenders exist to work with exactly those files, typically allowing gross and total debt service ratios up to roughly 45/50, and in some programs considerably higher, in exchange for a rate premium usually running 0.5 to 2 points over an A-lender file.
None of that flexibility is automatic, though. A B-lender underwriter is still assessing risk — just against a wider band than a bank uses — and a submission that doesn't address the reason the file needs a B lender in the first place invites conditions, or a decline. Here's what actually belongs in the package.
What's the first thing a B-lender submission needs to establish?
Every B-lender submission should open with a clear statement of why the file doesn't fit an A lender and why the B lender's program is the right fit — credit score, income type, debt ratios, or time-in-business. Underwriters read faster and push back less on a file that names its own risk up front rather than making them find it.
This is also where the deal notes earn their keep — see the Deal Notes Submission Cover Note Template for the structure that gets read first.
What ratios and pricing should a broker expect at a B lender?
| Metric | Typical A-lender | Typical B-lender range |
|---|---|---|
| Maximum GDS / TDS | 39% / 44% | Commonly 45% / 50%, with some extended programs allowing considerably higher on strong equity or net worth files |
| Minimum down payment | As low as 5% (insured) | Usually a minimum of 20% |
| Typical term length | Up to 5+ years, insured or conventional | Often 1 to 3 years, positioned as a bridge back to A |
| Rate premium vs. A | — | Roughly 0.5–2 percentage points above comparable A pricing, plus a lender fee commonly around 1% of the mortgage amount |
These are typical ranges, not guarantees — every B lender sets its own program parameters, and some extend ratios well past this range for files with strong compensating factors like low loan-to-value or verified net worth.
What income documentation actually satisfies a B-lender underwriter?
B lenders built their programs specifically to accept income that doesn't show cleanly on a T4 or two years of matching tax returns — but “flexible” doesn't mean undocumented. The common alternative-income programs each expect a specific evidence trail:
- →Stated income programs still expect the stated figure to be reasonable for the borrower's stated occupation and industry — unsupported figures invite a decline, not approval.
- →Bank statement programs require clean, explainable statements over the review period, with irregular deposits identified and sourced rather than left for the underwriter to guess at.
- →Rental or business income add-back programs need the underlying lease, financial statements, or accountant-prepared documentation that supports the number being used, not just the number itself.
For a fuller reference on how Canadian underwriters read self-employed and non-traditional income across all lender tiers, see Self-Employed Mortgage Underwriting: How Canadian Lenders Read Business Income.
What actually belongs in a B-lender submission package?
- 01Deal summary explaining why the file needs a B lender and why this program fits it.
- 02Full application with employment or business details matching the income program being used.
- 03Two years of Notices of Assessment, or the alternative income evidence the specific program calls for (bank statements, financial statements, lease agreements).
- 04Credit bureau with any derogatory items briefly explained in the deal notes.
- 05Down payment source documentation, with a 90-day paper trail for anything gifted — see the Down Payment Verification & Gift Letters guide.
- 06Property details and purchase agreement or existing mortgage statement.
- 07A stated exit strategy for shorter-term B-lender products — how the borrower expects to move back to an A lender at renewal.
The exit strategy line is easy to skip and shouldn't be. Because B-lender terms are typically short, an underwriter reading a file with no plan for what happens at renewal reads it as higher risk than one with a credible path back to an A lender.
Where does fulfillment support fit on a B-lender file?
B-lender files tend to carry more documentation, not less — more explanation letters, more supporting statements, more back-and-forth on income evidence. Treadstone's fulfillment associates assemble and QA these packages against the specific program's requirements before submission, which is where most of the back-and-forth on an alternative-income file actually gets avoided.