A file can pass every completeness check and still land badly on an underwriter's desk. Completeness asks “is everything here?” This checklist asks a harder question: “if I were the underwriter, what would I flag, and can I answer it before they ask?” That's a different pass entirely — it means re-doing the ratio math yourself, stress-testing whether the income is durable and not just present, and actively hunting for the handful of red flags that turn a routine file into a conditioned one.
This is the companion to Treadstone's 27-point pre-submission checklist, not a replacement for it. Run the 27-point check first — it's the fast completeness pass (documents present, dated, consistent). Run this checklist second, on files where the stakes or complexity warrant the deeper read, as the final pass before submission.
Why this is a second, deeper pass — not a duplicate
The pre-submission checklist catches missing pages, stale dates, and mismatched names — the mechanical failures that bounce a file back with an “incomplete” note. This checklist catches a different category entirely: files that are complete but still generate conditions, because the underwriter reads something in them that the broker didn't catch — a ratio that doesn't quite work, an income source that looks thinner on a second look, a debt that doesn't match the bureau.
When to run this deeper pass: self-employed or commission income, refinances with an unclear purpose, any file where something felt slightly off during intake, or simply any file above your typical size or complexity. Simple, clean salaried purchases may only need the 27-point pass.
The cost of skipping it compounds quietly. A file that comes back with three unanticipated conditions doesn't just cost the days it takes to satisfy them — it costs the underwriter's confidence in the next file from the same broker, and with roughly 1.15 million Canadian mortgages renewing in 2026 (about 60% of all outstanding mortgages by year end, per CMHC's Residential Mortgage Industry Report), lenders and underwriters are reading more files per broker than ever. A reputation for clean, well-reasoned files earns faster, lighter-touch reads across every submission that follows — and that compounding benefit is the actual return on the time this checklist takes.
Check 1. Recalculate GDS/TDS and the stress test yourself — don't trust the intake numbers
- 01Recompute GDS and TDS from the source documents, not from whatever number was entered into the application at intake — typos and outdated figures compound quietly.
- 02Confirm the ratios were calculated at the stress-tested rate — the greater of contract rate plus 2% or 5.25%, per OSFI's Minimum Qualifying Rate — not the advertised contract rate.
- 03For insured deals, confirm the file sits within 39% GDS / 44% TDS, and note by how much — a file that just squeaks under the ceiling deserves extra scrutiny on every other line.
- 04Cross-check every debt on the credit bureau against what's declared on the application; an undisclosed line of credit or car loan changes TDS enough to flip an approval.
- 05If the deal involves insured-ratio specifics such as the $1.5M cap and 30-year amortization for first-time buyers or new builds (in effect since December 15, 2024), confirm the file actually qualifies for that treatment before relying on it in the math.
Check 2. Stress-test income durability, not just income presence
- 01Salaried: confirm the applicant is past probation, and flag any recent job change even if the new role pays more — underwriters weigh tenure, not just current salary.
- 02Hourly or variable: confirm the averaging period used matches this lender's required history, not a shorter window that happens to produce a better number.
- 03Commission: confirm the figure used is a multi-year average, and that a letter from the employer confirms the commission structure is ongoing, not being phased out.
- 04Self-employed: confirm the two-year average from T1 Generals/NOAs is being used — the standard framing — and that both years show no tax arrears; a single strong year is not a substitute.
- 05Rental income: confirm the lender's specific offset or add-back method was applied correctly, and that the lease or market-rent figure used matches what's actually documented.
A quick worked example: a self-employed applicant's most recent NOA shows a strong year, but the prior year was thin because of a slow quarter. It's tempting to lean on the stronger number — but the standard framing lenders use is a two-year average from T1 Generals and NOAs, and presenting the stronger year in isolation is exactly the kind of gap an underwriter catches immediately, often after the file has already been submitted. Catching it yourself, in this pass, means either recalculating honestly with the two-year average or having a documented, defensible reason the lender's specific program allows otherwise — before it becomes a condition.
Check 3. Hunt the red flags before the underwriter finds them
- →NSF or overdraft activity anywhere in the 90-day account history — even a single instance invites questions about cash-flow management.
- →Unexplained gaps in employment, bank statement pages, or address history — anything that leaves a hole in the timeline.
- →Undisclosed debt visible on the credit bureau but absent from the application — the single most common trigger for a re-underwrite mid-file.
- →Down payment source gaps — a large deposit with no documented origin, or gifted funds where the gift letter amount doesn't match what actually landed in the account.
- →Recent credit inquiries that suggest new debt may be forming outside the application — a new car loan or line of credit applied for but not yet declared.
- →Inconsistent addresses or names across ID, application, and bureau that aren't explained anywhere in the file notes.
The standard to hold yourself to: if you can see it, assume the underwriter will too. The only question is whether you explain it first, or they ask and wait for your answer.
Red flags rarely arrive alone, and they rarely stay contained to the line item where they were found. One unexplained NSF invites a closer read of the entire 90-day account history; one undisclosed debt on the bureau invites a recheck of every other debt the applicant declared. Treat each red flag you find as a signal to widen the review, not just patch the one line — that's the difference between resolving an issue and having it resurface as a fresh condition two days before closing.
Check 4. Pre-empt conditions before they're issued
Most conditions are predictable if you've read the file the way an underwriter does. A large deposit will draw a source-of-funds condition — attach the explanation and supporting document now. A self-employed applicant will draw a request for additional NOAs or a business license — attach it now. A condo purchase will draw a status certificate requirement — confirm it's already ordered. Every condition you pre-empt is a round-trip you remove from the approval timeline.
Keep a running list, per lender, of the conditions that recur for each deal type and income profile — over time this becomes the single most valuable piece of institutional knowledge in an operation, because it's what turns a new team member into someone who reviews files like a veteran.
A few conditions are close to universal and worth anticipating on almost every file regardless of lender: a condo purchase will very likely draw a status certificate or estoppel requirement, so confirm it's already been requested rather than waiting for the condition letter to trigger it; an appraisal that hasn't come back yet should have a chase date logged, not just an order number, since a stalled appraisal is one of the most common causes of a late-stage delay; and any deposit that doesn't obviously match the applicant's regular pay pattern should have its source explanation attached before submission, not held in reserve for if it's asked about.
Check 5. Write the cover note that answers questions before they're asked
The cover note is the single highest-leverage document in the package, and it's the one brokers most often skip or under-write. A strong cover note does three things in a few short lines: states the deal shape plainly (purchase, refinance, switch, and why), walks through the income math in the exact terms the underwriter will use (employment type, calculation method, ratios), and names anything unusual in the file with its explanation already attached — before the underwriter has to ask.
A simple test: if you read only the cover note and nothing else, could you predict every condition this file will generate? If yes, the note is doing its job. If you're not sure, that's the gap to close before submission.
Once this deeper pass is done, run (or re-confirm) the 27-point pre-submission checklist as the final completeness gate — the two passes together are what a genuinely underwriting-ready file looks like. For the fuller picture of how underwriters weigh income, ratios, and lender fit, see the companion Broker's Underwriting Handbook.
When to bring in AI or human underwriting help
This level of file review takes real time to do well, and it's exactly the kind of structured, repeatable read that Treadstone's AI underwriting is being built to accelerate — running the same ratio recalculation, income-durability, and red-flag checks in a fraction of the time it takes by hand. It's currently early access with an email waitlist, not yet generally available, so today it supplements rather than replaces a careful manual pass. For the human side — a fulfillment team that packages files and runs reviews like this one on your behalf — see Treadstone's fulfillment services, available now.