No statute defines an A lender. The tiers are market shorthand, and knowing where the real lines fall is what lets you place a file first time.
Brokers talk about A, B and private lending as if they were regulatory categories. They are not. No Canadian statute or regulator defines them, and no two lenders draw the lines in quite the same place. They are useful market shorthand — as long as you know what actually sits underneath them.
Federally regulated and insurable-adjacent business. Underwriting is shaped by OSFI's Guideline B-20 and the minimum qualifying rate, which is why documentation and debt-service ratios are unforgiving.
Alternative and near-prime. Broader income documentation, higher tolerance for credit history, priced above A. Often the same institution's other shelf, or a monoline built for it.
Individual lenders and mortgage investment corporations outside federal prudential regulation. Shorter terms, equity-driven, priced for risk and for the exit.
What separates A from everything else is less the lender's name than whether the borrower qualifies at the minimum qualifying rate on that lender's terms. A file that fails there is not a worse file — it is a file for a different shelf.
The useful question is not which tier a borrower belongs to. It is which specific constraint is binding: income documentation, credit history, property type, debt service, or timing. Files fail for one reason far more often than three, and naming that reason tells you where the deal fits.
Equity-driven lending in particular is decided on the exit. A private lender is asking what happens in twelve months, not what happened three years ago. Packaging a private deal around the exit is most of the work.
They say nothing about the disclosure obligations attaching to a file, which are set by your provincial regulator and are heaviest on private deals. They say nothing about conflicts, which are assessed on the relationship rather than the tier. And they say nothing about suitability, which in some provinces is a formal, documented assessment rather than a judgment call.
The A, B and private labels are industry convention and are not attributed to any regulator here, because no regulator defines them. OSFI's Guideline B-20 and the minimum qualifying rate are real and published at osfi-bsif.gc.ca. Current as of 1 September 2026.
A.I.M.I. Collective brokers submit directly across the full spectrum, with a deal desk for the files that need a second set of eyes.