The client
An aluminum-smelter shift worker in Alma, $5,800/mo in stable T4 income, running a side small-engine and snowmobile repair business out of his garage — busiest each fall before snowmobile season and each spring at thaw. He had exactly two full T1 years for the side business by the time he applied for a $295,000 home at 5% down.
Primary income
$5,800/mo aluminum-sector T4
$69,600/yr, stable shift employment
Side business
Small-engine & snowmobile repair
Two full T1 years filed, GST/QST registered
Side business net
$7,200 then $10,800
Two-year average $750/mo
New purchase
$295,000, Alma
Property tax $230/mo; lender-standard heat $110/mo
Down payment
$14,750 — 5%
Minimum down payment at this price
Existing debt
Car loan $310/mo
The side business's two T1 years:
| Side business income | Year 1 | Year 2 |
|---|---|---|
| T1 net income | $7,200 | $10,800 |
| Two-year average, monthly | $750 |
The problem
With only the T4 counted — the side business excluded on the grounds that its history was not yet fully seasoned — GDS reached 40.4% and TDS 45.8%, both over CMHC's maximums, even though the T4 income itself was never in doubt.
T4 alone versus T4 plus the side business
- ▸T4 income only: $5,800/mo. GDS: 40.4% — over the 39% maximum. Declined.
- ▸T4 plus the side business's two-year average: $6,550/mo. GDS: 35.8% — under the maximum. Approved.
The question was never whether $750/mo was real income — it was whether two T1 years and an active tax registration were enough documentation to count it at all under self-employed averaging rules, or whether a lender would insist on a longer track record before touching it.
The numbers
At 5% down on a $295,000 purchase this file sits at 95% LTV, the top insured band, so CMHC's caps apply directly.
| Structuring the insured loan | Amount |
|---|---|
| Purchase price | $295,000 |
| Down payment (5%) | −$14,750 |
| Base mortgage (95% LTV) | $280,250 |
| CMHC premium — 4.00% at 90.01–95% LTV, capitalized | +$11,210 |
| Total insured mortgage | $291,460 |
| Rate & payments | Figure |
|---|---|
| Contract rate — 5-year fixed (illustrative, not a quote) | 4.79% |
| Minimum qualifying rate — contract + 2% | 6.79% |
| Monthly P&I at the qualifying rate — the ratios run on this | $2,004 |
| Monthly P&I at the contract rate — what he actually pays | $1,660 |
GDS and TDS, with and without the side business
| Ratio | T4 only (declined) | T4 + side business (approved) |
|---|---|---|
| Income used | $5,800/mo | $6,550/mo |
| GDS ($2,004 + $230 + $110 ÷ income) | 40.4% | 35.8% |
| TDS (GDS numerator + $310 car loan ÷ income) | 45.8% | 40.5% |
The qualifying payment of $2,004/mo never changes. What moves the file is whether two full T1 years of side-business income — the same convention a self-employed two-year average is built around — is enough to include it, or whether a stricter policy excludes it pending more history.
The solution
A courtier hypothécaire licensed by the AMF confirmed the side business met the standard two-year threshold before resubmitting the file.
First, confirmed the history was genuinely two full years, not two partial years spanning a shorter operating period — a distinction that decides whether a lender's own convention applies at all.
Second, produced proof of ongoing, consistent operation: an active GST/QST registration held continuously across both years, invoices spanning both the fall and spring peaks, and both T1 returns filed on time.
Third, moved the file to a lender confirmed to count secondary self-employment income once two full years and an active registration are on file, adding the side business's calculated T1 average to the T4.
The outcome & the closing math
Approved and funded insured at 95% LTV, 25-year amortization, 5-year fixed term. Quebec taxes default-insurance premiums separately from the purchase itself:
| Cash due at closing (beyond the down payment) | Amount |
|---|---|
| Quebec's welcome tax on $295,000 — indexed brackets | $2,636 |
| Quebec's 9% tax on the insurance premium — $11,210 × 9% | $1,009 |
| Legal fees, title insurance & adjustments | varies |
Both taxes are cash at closing, separate from the down payment; the premium itself is capitalized into the mortgage, but the tax on it is not.
What to take from this file
- 01Two full years is a threshold, not a formality. Confirm the history spans two complete tax years before assuming a secondary self-employed income will be excluded or included.
- 02An active GST/QST registration is corroborating evidence, not a requirement in itself — but it strengthens a thin self-employment file considerably.
- 03A stable T4 income does not exempt the rest of the file from scrutiny. The side business, not the smelter job, was the whole underwriting question here.
- 04Quebec's insurance-premium tax is cash at closing on top of the welcome tax — budget for both, not just the more familiar transfer tax.
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.
- ▸Gouvernement du Québec — Droits sur les mutations immobilières — Quebec's transfer duties ('welcome tax') — 2026 indexed brackets.
- ▸Act respecting the Québec sales tax, CQLR c. T-0.1, Title III ("Taxation of Insurance Premiums"), ss. 507, 512, 520 — Quebec's 9% tax on insurance premiums (rising to 9.975% in 2027).
- ▸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:
- ▸4.79% contract rate — rates move daily; not a quote.
- ▸the two-full-years threshold for counting side self-employment income — each lender sets its own minimum history before a secondary self-employed income counts at all.
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.