The client
A household buying a new-build near Selkirk, Manitoba, agreed to a stated purchase price of $410,000, with the builder offering a $20,000 cash-back credit toward closing costs and upgrades — a common enough new-build incentive, and an easy one to size a mortgage around incorrectly.
Stated purchase price
$410,000
New-build, Selkirk
Builder's cash-back incentive
$20,000
Toward closing costs, not the purchase itself
Combined income
$7,700/month
Both salaried
Other debt
Car loan $290/mo
Unchanged through the purchase
The problem
Financed off the stated $410,000 price with the $20,000 incentive treated as if it were the buyer's own money, both the loan-to-value ratio and the insured mortgage amount would be measured against a price $20,000 higher than what the buyer was actually contributing out of pocket.
Why the incentive can't just be added on top
- ▸A vendor or builder incentive reduces the buyer's real cost, but it isn't the buyer's own down payment
- ▸Sizing the mortgage off the stated price lets the incentive quietly inflate both the LTV and the loan amount
- ▸The fix is arithmetic, not negotiation: net the incentive out of the price before calculating anything else
Correctly sized, this file was never going to be a hard approval — $7,700 of income against a well-inside-cap qualifying payment. Getting the price right, before touching the down payment calculation, was the entire job.
The numbers
Netting the incentive first changes the minimum down payment, the LTV band, and the mortgage default insurance premium together — not just the number the buyer sees at closing.
| Sizing correctly, net of the incentive | Amount |
|---|---|
| Stated purchase price | $410,000 |
| Builder's cash-back incentive | -$20,000 |
| Net price for financing | $390,000 |
| Minimum down payment (5% tier) | $19,500 |
| Base mortgage | $370,500 |
| CMHC premium — 4.00% in the 90.01-95% LTV band | +$14,820 |
| Total insured mortgage | $385,320 |
| Sizing the mortgage | Correct (net price) | Incorrect (stated price) |
|---|---|---|
| Price used for financing | $390,000 | $410,000 |
| Minimum down payment | $19,500 | $20,500 |
| Insured mortgage amount | $385,320 | $405,080 |
Sizing off the stated price doesn't just misstate the down payment — it inflates the mortgage itself by $19,760, because the mortgage default insurance premium is calculated on the wrong base amount too.
Qualifying payment on the correctly sized $385,320 mortgage comes to $2,628/mo at 6.70%, GDS at 38.7% and TDS at 42.4% against $7,700 of income — both inside CMHC's maximums.
The solution
A mortgage broker registered under Manitoba's Mortgage Brokers Act treated the incentive as a pricing adjustment to make before any down payment math, not a bonus to layer on top of it.
First, deducted the $20,000 incentive from the stated price before calculating anything. Established $390,000, not $410,000, as the price the minimum down payment and loan-to-value band would be measured against.
Second, verified the buyer's actual down payment came from their own funds. Bank statements confirmed the down payment was the buyer's own money, entirely separate from the builder's credit.
Third, sized the insured mortgage to the net $390,000 price. $385,320 total, correctly banded and premiumed, rather than the $405,080 a naive calculation off the stated price would have produced.
The outcome
The mortgage funded insured at 4.70% against the correctly netted $390,000 price, GDS at 38.7% and TDS at 42.4%, both inside CMHC's maximums — $19,760 less mortgage than an incentive-inflated calculation would have produced.
What to take from this file
- 01A vendor or builder incentive on a new-build purchase reduces the buyer's real cost, but it is not the buyer's own down payment.
- 02Net the incentive out of the purchase price before calculating the minimum down payment or the loan-to-value band, not after.
- 03Sizing off the wrong base price doesn't just misstate the down payment. The CMHC premium compounds the error into the mortgage amount itself.
- 04Verify the down payment actually came from the buyer's own funds, separate from anything the builder is crediting.
- 05A $20,000 incentive and a $19,760 mortgage overstatement aren't a coincidence. The two numbers track each other closely once the premium band is factored in.
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.
Illustrative in this file — lender-specific, not rules:
- ▸4.70% contract rate — rates move daily; not a quote.
- ▸netting a vendor/builder incentive from the price for LTV purposes — each lender and insurer applies its own policy for vendor-paid incentives on a new-build purchase; not cited to one published table here.
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.