The client
A steelworker in Sault Ste. Marie, with a stable T4 job at a local mill, also runs a small welding and repair side business on evenings and weekends, reported on its own T2125. His first lender's self-employed overlay treated any sole-proprietorship on the file the same way — and excluded the side business entirely.
Borrower
Steelworker, T4-salaried
Plus a side welding/repair sole proprietorship
T4 income
$76,000 / year
$6,333 per month, multi-year tenure
Side business T2125, Year 1
$9,000
Evenings/weekends, first full year
Side business T2125, Year 2
$14,000
Second year, growing client base
New purchase
$345,000 detached, Sault Ste. Marie
Property tax $300/mo; heat estimate $130/mo
Down payment
$34,500 — 10%
Under 20%, so the file must be default-insured
The side business's two T2125 years:
| Side business T2125 net income | Amount |
|---|---|
| Year 1 | $9,000 |
| Year 2 | $14,000 |
| Two-year average | $11,500/yr — $958/mo |
The problem
The bank's policy for any file touching self-employment income was blanket, not proportional: it required two full years of standalone documentation before counting a dollar, and it applied that rule to the whole file rather than scaling it to how small the side business actually was next to a stable primary T4 income. With the side income at zero, the file came up short.
The T4-only arithmetic
- ▸Income used: $6,333/mo (T4 only, side business excluded)
- ▸Liabilities: mortgage payment at the qualifying rate + property tax + heat + car loan
- ▸TDS: 48.8% — against CMHC’s 44% maximum. Declined.
The T4 income on its own was genuinely strong and stable — the file wasn't hard because of anything wrong with the primary employment. It was hard because a lender's all-or-nothing self-employed policy meant a few hundred dollars a month of side income, fully documented on two T2125s, contributed nothing to qualifying.
The numbers
At 10% down this is an insured purchase, so CMHC's maximums — GDS 39%, TDS 44% — are hard caps.
| Structuring the insured loan | Amount |
|---|---|
| Purchase price | $345,000 |
| Down payment (10%) | −$34,500 |
| Base mortgage (90% LTV) | $310,500 |
| CMHC premium — 3.10% in the 85.01–90% LTV band, capitalized | +$9,626 |
| Total insured mortgage | $320,126 |
| Rate & payments | Figure |
|---|---|
| Contract rate — 5-year fixed (illustrative, not a quote) | 4.89% |
| Minimum qualifying rate — greater of contract + 2% and 5.25% | 6.89% |
| Monthly P&I at the qualifying rate — the ratios run on this | $2,221 |
| Monthly P&I at the contract rate — what they actually pay | $1,842 |
T4 alone vs. T4 plus the averaged side business
The T4 income counts in full from day one, backed by a letter of employment; the side business is added separately, on its own standard two-year average.
| Income treatment | T4 alone | T4 + side business average |
|---|---|---|
| Income, monthly | $6,333 | $7,291 |
| GDS | 41.9% | 36.4% |
| TDS vs. the 44% cap | 48.8% ✗ | 42.4% ✓ |
Adding the side business's modest $958/mo average is enough on its own to move TDS from a declined 48.8% to an approved 42.4%.
The solution
An FSRA-licensed Ontario mortgage agent placed the file with a lender whose combined-income policy scales to the size of the side business rather than applying the same bar it would to a borrower who is self-employed full time.
First, separated the two income sources on their own terms. The T4 job needed only the usual employment documentation; the side business needed its own two-year average, run the same way it would be for any sole proprietorship. At $320,126, the insured mortgage itself was modest against the average new mortgage amount in Canada, which made the side business's contribution proportionally larger to the outcome.
Second, matched the file to that lender's published combined-employment policy rather than the first bank's blanket self-employed overlay, which didn't distinguish a primary T4 with a small side business from a borrower who is fully self-employed.
Third, packaged full documentation for both income sources so there was no ambiguity about which rules applied to which income.
With both income sources documented on their own terms, the insurer's approval followed the lender's.
The outcome & the closing math
Approved and funded: insured at 90% LTV, 25-year amortization, 5-year fixed term. The side business kept running unchanged — it never had to become the borrower's main income to matter to the file.
| Cash due at closing (beyond the down payment) | Amount |
|---|---|
| Ontario land transfer tax on $345,000 — marginal brackets; no first-time-buyer refund for a repeat buyer | $3,650 |
| Ontario RST on the insurance premium — 8% × $9,626 | $770 |
| Legal fees, title insurance & adjustments | varies |
The lender also required evidence of funds to cover closing costs on top of the $34,500 down payment, which the same 90-day statements demonstrated.
What to take from this file
- 01A blanket self-employed policy can penalize a borrower whose side income is genuinely small. Look for a lender whose combined-income treatment scales to the proportion of self-employment in the file.
- 02A stable T4 job counts in full from day one. Only the self-employed portion of a combined-income file needs the two-year average.
- 03Even a modest side income can be the difference on a tight file. $958 a month moved this file from declined to approved.
- 04The ratios run at the qualifying rate, not the contract rate. This file qualifies at 6.89% and pays at 4.89% — a $379-a-month gap.
- 05Budget the closing cash separately from the down payment. Land transfer tax and RST on the premium added $4,420 in cash before legal fees.
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 Reviews Underwriting Criteria — GDS 39% / TDS 44% maximums and the 600 credit-score floor for insured files.
- ▸OSFI — Minimum qualifying rate for uninsured mortgages — the minimum qualifying rate — greater of contract rate + 2% or 5.25%.
- ▸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.
- ▸Ontario.ca — Retail Sales Tax: Insurance and Benefits Plans — 8% Ontario RST on default-insurance premiums, cash at closing.
Illustrative in this file — lender-specific, not rules:
- ▸4.89% contract rate — rates move daily; not a quote.
- ▸two-year averaging convention for the side business — each lender sets its own policy for combined employment plus self-employment files.
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.