The client
A newcomer with no Canadian credit history yet, and a Canadian-resident friend, bought a $400,000 Stratford home together, each contributing their own share of the $40,000 down payment.
Purchase price
$400,000, Stratford
10% down, insured
Newcomer's contribution
$10,000
25% of the down payment
Friend's contribution
$30,000
75% of the down payment
Combined income
$8,300/month
Both names as genuine co-borrowers
The problem
The standard fix for a thin-credit newcomer is a guarantor -- a family member or friend added purely for covenant strength, contributing no income, holding no ownership, and taking on only secondary, contingent liability. This newcomer and their friend wanted something different.
Why a guarantor was never the plan
- ▸A guarantor adds no income to the ratios and takes no ownership share -- exactly the opposite of what these two buyers actually wanted
- ▸Both intended to genuinely own the home together, in proportions matching what each of them put in
- ▸The newcomer's own income, though real, was not yet enough alone to qualify without a co-borrower's income counted in full
This was never a covenant-strength problem to solve. It was a two-name purchase that needed documenting as one.
The numbers
Once the two buyers' actual contributions were set, the ownership split and the qualifying math followed directly.
| One purchase, two real co-borrowers | Amount |
|---|---|
| Down payment (10%) | $40,000 |
| CMHC premium (3.10% at 90% LTV) | +$11,160 |
| Total insured mortgage | $371,160 |
| Ratio check at the qualifying rate | Figure |
|---|---|
| Payment at the qualifying rate (6.90%), 25 years | $2,577/mo |
| GDS (payment + $280 tax + $110 heat) ÷ $8,300 combined income | 35.7% |
| TDS (GDS numerator + $200 car loan) ÷ $8,300 combined income | 38.2% |
35.7% and 38.2% sit comfortably inside CMHC's 39% GDS and 44% TDS maximums -- both names' income counted in full, consistent with how down payment data shows a genuinely joint purchase typically qualifies.
The solution
A mortgage agent licensed under Ontario's Mortgage Brokerages, Lenders and Administrators Act structured the file around what these two buyers actually wanted, not the default fix for a thin-credit newcomer.
First, confirmed each buyer's actual down-payment contribution -- $10,000 from the newcomer, $30,000 from the friend -- setting a 25/75 split matching real dollars, not an even default.
Second, drafted a short co-ownership agreement alongside the purchase, documenting the split and each party's share of ongoing costs -- a materially different document, and a materially different relationship, from a guarantor's covenant.
Third, submitted both incomes and both names as genuine co-borrowers, registered as tenants in common at the agreed 25/75 ratio, rather than treating one as the qualifying borrower and the other as a covenant-only signature.
The outcome
The purchase funded insured at 35.7% GDS and 38.2% TDS, with both names carrying real equity into a home neither could have qualified for -- or wanted to own -- alone.
Both ratios sit comfortably inside CMHC's 39% GDS and 44% TDS maximums. Ontario land transfer tax on the $400,000 purchase came to $4,475.
What to take from this file
- 01A guarantor and a co-owner are not the same solution to the same problem. A guarantor adds covenant strength with no income and no ownership; a co-owner adds real income and takes a real, documented equity share.
- 02Ask early which structure the buyers actually want, rather than defaulting to a guarantor whenever a newcomer's own file is thin.
- 03Document the ownership split by actual contribution, not an even default. A short co-ownership agreement at purchase avoids a much harder conversation later.
- 04Combined income from two genuine co-borrowers can qualify a file neither could alone. That only works cleanly when the ownership structure actually matches who is really on the loan.
Sources
Every regulatory figure in this file traces to one of these primary sources. Client details and anything that varies by lender are illustrative, as flagged below.
- ▸CMHC — Purchase (Mortgage Loan Insurance) — default-insurance premium schedule by LTV band (25-year amortization).
- ▸CMHC — CMHC Home Start — minimum down payment tiers (5%/10%) and the $1.5M insured price cap.
- ▸OSFI — Minimum qualifying rate for uninsured mortgages — the minimum qualifying rate — greater of contract rate + 2% or 5.25%.
- ▸CMHC — CMHC Reviews Underwriting Criteria — GDS 39% / TDS 44% maximums and the 600 credit-score floor for insured files.
- ▸Provincial/territorial mortgage-broker legislation fetched directly (bclaws.gov.bc.ca, legisquebec.gouv.qc.ca, fcaa.gov.sk.ca, web2.gov.mb.ca, nslegislature.ca, assembly.nl.ca) plus FCNB's own site for NB and CanLII's index for PE — see notes for per-province method — provincial mortgage regulators and licence titles.
- ▸Ontario.ca — Calculating Land Transfer Tax / Land Transfer Tax Refunds for First-Time Homebuyers — Ontario's marginal land transfer tax brackets and first-time-buyer refund.
Illustrative in this file — lender-specific, not rules:
- ▸4.90% contract rate — rates move daily; not a quote.
- ▸the 25/75 ownership split — this reflects these two buyers' own contributions and their own co-ownership agreement; there is no standard split for a non-spousal purchase.
Authority & provenance
How this case file was built
We publish the origin, the verification method and the reviewer for every case file, so you can judge how far to trust it before you rely on it with a client.
Where it comes from
Derived from files handled by Treadstone’s fulfillment desk and from scenarios contributed by partner brokerages. Names, employers, exact amounts and dates are changed so no client or file is identifiable.
Provenance: Composite — a pattern seen repeatedly on fulfilled files, not a single transaction.
What is verified
Every regulatory figure traces to a primary source listed above and was checked against it on the date shown. The arithmetic is recomputed by machine on every rebuild.
Anything that varies by lender is labelled illustrative rather than stated as a rule.
Who reviewed it
Reviewed for Canadian regulatory accuracy before publication, and re-checked whenever a cited rule changes.
Reviewed by: Nicholas Parson, Treadstone Associates — reviews every case file before publication.
This case file is professional reference material for licensed mortgage professionals. It is not advice to a borrower, and it is not a lender commitment. Insurer rules, qualifying rates and provincial taxes change — confirm the current position with the insurer, regulator or lender before you rely on any figure here in a live file.