The client
A self-employed tutor and part-time bookkeeper in Sarnia bought a $255,000 home with her spouse, her own sole-proprietor revenue running consistently under the federal small-supplier threshold and never requiring GST/HST registration.
Purchase price
$255,000, Sarnia
Her self-employment income, 2-year average
$2,300/month
Spouse's employment income
$5,200/month
Down payment
$12,750 (5%, the minimum at this price)
The problem
Under the Excise Tax Act's small-supplier rule, a sole proprietor whose worldwide taxable revenue stays under $30,000 across four consecutive calendar quarters is not required to register for or collect GST/HST at all -- a threshold that has not moved since 1991. She had never come close to it: her tutoring and bookkeeping work brought in well under the limit every year.
What the standard checklist assumed that wasn't true here
- ▸The lender's self-employed document checklist asked for two years of GST/HST return summaries as a standard cross-check against reported income
- ▸She had never registered for a GST/HST number and had no returns to produce, because none were legally required at her revenue level
- ▸Nothing about the missing filings reflected a documentation gap or an income-verification problem -- it reflected a genuinely small, compliant sole proprietorship
A document that does not exist cannot be supplied, no matter how standard the checklist item is for a larger self-employed file.
The numbers
With the GST/HST question resolved, qualifying the household on both incomes for the insured purchase was ordinary arithmetic.
| The insured purchase | Amount |
|---|---|
| Purchase price | $255,000 |
| Down payment (5%, the minimum at this price) | −$12,750 |
| Base mortgage | $242,250 |
| CMHC premium at 4.00% (90.01–95% LTV band) | +$9,690 |
| Total insured mortgage | $251,940 |
| Ratio check at the qualifying rate | Figure |
|---|---|
| Minimum qualifying rate on a 5.15% contract rate | 7.15% |
| Payment at the qualifying rate, 25 years | $1,788/mo |
| Property tax | $260/mo |
| Heat (lender estimate) | $95/mo |
| Gross debt service | 28.6% |
| Car loan | $225/mo |
| Total debt service | 31.6% |
Both ratios cleared CMHC's 39%/44% maximums comfortably on the combined $7,500/month household income -- her own income verified through her T1 and bank deposits, with no GST/HST filing anywhere in the file.
The solution
A mortgage agent licensed under Ontario's Mortgage Brokerages, Lenders and Administrators Act treated the missing GST/HST returns as a fact about her business size, not a documentation deficiency to chase down.
First, ran the ordinary two-year average on her revenue across the relevant four consecutive calendar quarters, confirming it stayed under the $30,000 small-supplier threshold, using her own bookkeeping ledger and bank deposit records.
Second, substituted her T1 and T2125 self-employment schedule, cross-checked against bank deposits, for the GST/HST summary the standard checklist asked for, since no return had ever existed to produce.
Third, documented in the file exactly why no GST/HST registration existed, so the underwriter reviewing the file understood the absence as compliant, not incomplete.
The outcome
The insured purchase funded at 5.15%, qualified on the combined $7,500/month household income, with total debt service at 31.6% and no GST/HST filings anywhere in the file.
Because this file is CMHC-insured, the 28.6% and 31.6% figures are tested directly against the insurer's own 39%/44% caps, not merely informational.
What to take from this file
- 01A sole proprietor under the $30,000 small-supplier threshold is not required to register for GST/HST at all. The absence of returns can reflect a genuinely small, compliant business, not a documentation gap.
- 02The threshold is tested across four consecutive calendar quarters, not a calendar year. Confirm the actual rolling-quarter revenue before assuming registration was required.
- 03Substitute the T1 and bank records when a standard checklist item genuinely doesn't apply. Explain why in the file rather than treating the gap as unresolved.
- 04Not every self-employed file looks like a larger incorporated business's file. A small, honest sole proprietorship can be entirely legitimate with a thinner document set.
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%.
- ▸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.
- ▸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.
- ▸CMHC — CMHC Home Start — minimum down payment tiers (5%/10%) and the $1.5M insured price cap.
Illustrative in this file — lender-specific, not rules:
- ▸5.15% contract rate — rates move daily; not a quote.
- ▸the $2,300 and $5,200 monthly income figures — each household's own results set these figures; not a formula.
- ▸the $30,000 small-supplier threshold — this is the Excise Tax Act's own federal figure, unchanged since 1991 -- confirming an individual supplier's actual revenue against it is still a case-by-case check.
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.