The client
A family building a $340,000 home near Melfort, Saskatchewan, on land they already owned. Combined income $7,700/month, financed on a draw structure that capitalizes accrued interest into the mortgage rather than billing it monthly during the build.
Borrowers
Combined income $7,700/month
Both salaried
Build
$340,000 contract
Land already owned
Other debt
$290/mo
Other monthly debt payment
Draw structure
Interest capitalized, not billed
A product feature of this particular lender
Average drawn balance
$170,000 across the build
Illustrative average across an evenly-staged schedule
The problem
A construction (draw) mortgage only advances funds as work completes, so the outstanding balance — and the interest accruing on it — grows through the build rather than starting at the full amount on day one. Some lenders bill that accrued interest monthly, the way an interest-only loan would; others simply add it to the principal and collect it later, inside the permanent mortgage.
What capitalizing the interest actually did to this file
- ▸Average outstanding balance across the build: $170,000
- ▸Accrued interest at the interim rate, added to principal rather than billed: $7,648
- ▸Take-out mortgage completed at $347,648 — not the $340,000 contract the family had been budgeting around
Nobody had done anything wrong. Capitalizing draw-period interest instead of billing it monthly is a legitimate, common product feature — it just means the number a family sees on their approval letter isn't the number they'll actually owe once the permanent mortgage funds, unless someone quantifies the gap in advance.
The numbers
The $7,648 gap didn't show up as a fee or a surprise invoice — it showed up as a permanently larger mortgage balance, and a permanently larger payment to go with it.
| Flat contract vs. the capitalized take-out | Amount |
|---|---|
| Contract price (land already owned) | $340,000 |
| Capitalized accrued interest added to principal | +$7,648 |
| Actual take-out mortgage | $347,648 |
| Minimum qualifying rate (greater of contract + 2% or 5.25%) | 7.35% |
| Qualifying payment, 25 years | Figure |
|---|---|
| On the flat $340,000 contract amount | $2,455/mo |
| On the actual, capitalized $347,648 take-out | $2,511/mo |
The $56-a-month difference is not a one-time cost — it repeats every month for as long as the mortgage runs, because it is baked into the principal itself, not billed and forgotten during construction.
Ratios on the actual take-out
| Ratio | On the $347,648 take-out |
|---|---|
| GDS (payment + $260 tax + $130 heat) ÷ $7,700 income | 37.7% |
| TDS (GDS numerator + $290 other debt) ÷ income | 41.4% |
The solution
A Saskatchewan mortgage broker flagged the capitalization clause the moment the draw agreement was reviewed, before a single dollar was advanced.
First, quantified exactly what capitalizing would add. Using the average outstanding balance across a typical draw schedule and the interim rate, the $7,648 figure was on the table before the family signed anything.
Second, gave the family a real choice. Accept the capitalized structure as priced, or move the file to a lender that bills draw-period interest monthly instead — a structure that would have kept the take-out at the flat $340,000 contract price, at the cost of monthly out-of-pocket interest payments during the build itself.
Third, priced the ratio impact either way so the decision wasn't made on the principal amount alone — the $56-a-month difference, and what it meant against their income, was part of the same conversation.
The outcome
The family chose to keep the capitalized structure rather than carry out-of-pocket interest payments during the build. The take-out funded at $347,648, qualifying payment $2,511/mo, GDS 37.7%, TDS 41.4%.
The decision to accept capitalization was made with the $56-a-month, life-of-amortization cost disclosed in writing — not discovered on the first mortgage statement after completion.
What to take from this file
- 01An approved construction amount is not always the final mortgage. Whether draw-period interest is billed or capitalized changes the take-out balance itself.
- 02Capitalized interest is a permanent cost, not a one-time one. It repeats every month for the life of the amortization, unlike a fee paid once at closing.
- 03Quantify the gap before the draw agreement is signed. An average-balance estimate, priced against the interim rate, gives a family a real number to weigh against the alternative.
- 04Billing interest monthly is the trade-off, not a free alternative. It avoids capitalization at the cost of real out-of-pocket payments during the build itself.
- 05Read the draw agreement's interest treatment as carefully as the draw schedule. It is a product feature that varies lender to lender, not a standard term.
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.
- ▸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:
- ▸5.35% contract rate / 6.75% interim draw rate — rates move daily; neither is a quote.
- ▸capitalizing accrued interest instead of billing it monthly — each construction lender sets its own draw-interest policy; whether interest is capitalized or billed is a product feature, not a rule.
- ▸the 50% average-outstanding-balance assumption — an illustrative simplification for an evenly-staged draw schedule; actual average balance depends on the real draw timeline.
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.