Study for the Sub-Mortgage Broker Course by practising decisions, not just definitions: hand-compute GDS and TDS on sample files, distinguish conventional from high-ratio financing by loan-to-value, read term, amortization, and payment frequency off commitment-style facts, and identify disclosure and conflict-of-interest triggers. Work one scenario file per session and self-score against a rubric.
Sub-Mortgage Broker vs. Mortgage Broker: Which Role and Duties Apply in BC
In British Columbia, mortgage brokerage activity is regulated, and working without the required registration exposes a person to enforcement action. A sub-mortgage broker operates under the umbrella of a registered brokerage rather than independently.
The role distinction matters because your scope of practice determines what you may do on a file. A sub-mortgage broker deals with borrowers and lenders on behalf of a brokerage, under its supervision and within its processes, while a broker or principal broker carries additional responsibility for the brokerage's compliance. When a scenario asks what you should do, a defensible answer usually stays inside that scope: gather facts, present options, and escalate compliance questions through the brokerage.
BCFSA, the provincial regulator, oversees mortgage brokers in British Columbia and publishes enforcement decisions and resources on its website. Note that registration requirements, education steps, and fees are administrative details set by the regulator and course provider — confirm those directly with BCFSA and your course rather than relying on secondhand summaries. For study purposes, the useful takeaway is that 'unregistered activity' and 'supervision' are named concepts you should be able to define and apply to a scenario.
Computing GDS and TDS Without Mixing Up the Numerators
Gross Debt Service (GDS) measures housing costs against income; Total Debt Service (TDS) adds other debt obligations. The classic error is putting the wrong items in the numerator, which flips a borderline file into an approval it is not.
Worked scenario: A borrower earns $78,000 annually, with monthly property tax of $220, heating of $120, a proposed mortgage payment of $1,750, and a car loan of $450. Assume, for this exercise, a lender applies GDS and TDS ceilings of 39% and 44%. Monthly income is $6,500. GDS = (1,750 + 220 + 120) / 6,500 = $2,090 / 6,500 ≈ 32.2%. TDS = (2,090 + 450) / 6,500 = $2,540 / 6,500 ≈ 39.1%. Both sit under the assumed ceilings.
The plausible mistake: a candidate adds the car loan into GDS, or forgets heating, or divides by annual income instead of monthly, producing ratios that look like failures. The better decision is to list components explicitly before dividing: GDS takes shelter costs only (principal, interest, taxes, heat, and where applicable strata or condominium fees); TDS then adds car loans, credit cards, student debt, and other obligations. Why it matters: in a case question, the same raw facts support opposite recommendations depending on the numerator, so the grader is testing component classification as much as arithmetic.
Conventional vs. High-Ratio Financing: Why the LTV Line Changes the File
Loan-to-value (LTV) compares the loan amount to the property's value or purchase price. When the loan exceeds roughly 80% of value, financing is commonly treated as high-ratio in Canadian practice, which typically brings mortgage default insurance into the picture.
The LTV classification changes what you must consider: down payment adequacy, default insurance premiums and how they are added to the loan, insurer eligibility criteria for the borrower and property, and often the maximum amortization available. A scenario that hands you a purchase price, down payment, and appraised value is usually inviting exactly this classification step before anything else.
Worked scenario: Purchase price $520,000, down payment $90,000, so the loan is $430,000. LTV = 430,000 / 520,000 ≈ 82.7%. The plausible mistake: comparing the loan to the down payment, or to a dated appraisal, and concluding the deal is conventional. The better decision is to define LTV consistently (loan divided by the lower of purchase price or appraised value, in most lender practice) and flag the file as high-ratio, then check insurer criteria. Why it matters: misclassifying the file means you skip the insurer lens entirely — amortization limits, premium amounts, and eligibility rules — and your recommendation rests on assumptions the file does not support. Confirm current insurer and lender thresholds from course materials, since these are policy parameters that programs revise.
| Feature | Conventional (roughly ≤80% LTV) | High-ratio (above ~80% LTV) |
|---|---|---|
| Default insurance | Typically not required | Typically required through a default insurer |
| Key extra check | Lender criteria only | Lender plus insurer eligibility criteria |
| Amortization | Longer options often available | Insurer rules may cap available amortization |
| Cost driver | Rate and lender/broker fees | Premium added to loan or paid up front |
| Down payment focus | Equity cushion | Minimum down payment rules by price band |
Term, Amortization, and Payment Frequency: Reading Commitment Facts Correctly
The term is how long your contract with a specific rate runs; amortization is how long the payments are scheduled to take to retire the loan; payment frequency changes cash flow, not the underlying debt structure.
Course scenarios love to tangle these three. A five-year term with a 25-year amortization means the borrower will face renewal in five years with 20 years remaining — a fact that drives renewal risk questions and stress-test-style reasoning. Payment frequency (monthly, bi-weekly, accelerated bi-weekly) affects how quickly principal falls, and 'accelerated' options increase the effective annual payment rather than merely splitting it.
A practical habit: whenever a scenario gives you rate, term, amortization, and frequency, write a one-line summary before answering — e.g., '5-year fixed, 25-year amortization, accelerated bi-weekly payments.' The plausible mistake is computing an affordability figure using the term instead of the amortization, or treating an accelerated payment as neutral. The better decision is to check which figure the question actually asks about: qualification usually keys off amortization-based payments, while affordability of cash flow keys off the actual frequency. Why it matters: misreading which payment applies is one of the few errors that can make an arithmetic-perfect answer wrong.
Disclosure and Conflict-of-Interest Scenarios: What Changes Your Next Step
Disclosure duties and conflicts of interest are decision triggers: when the broker has an interest in the transaction, or material facts bear on the borrower's choice, the correct action is to surface it in writing and follow the brokerage's process, not to proceed quietly.
Worked scenario: You are helping a family friend refinance, and your spouse is the real estate professional involved in a related matter. The plausible mistake: treating the relationship as informal and proceeding without telling the brokerage, reasoning that the rate is competitive anyway. The better decision is to disclose the relationship to your brokerage in writing, ask how the firm wants the conflict handled, and document what the borrower was told. Why it matters: the regulatory lens focuses on whether the borrower could make an informed choice and whether your brokerage supervised the file — both of which depend on disclosure having actually happened, not on the deal's economics.
Disclosures also attach to the deal itself: lender compensation arrangements, fees you charge, and material risks of the product being recommended. In a scenario question, look for facts hidden in the narrative — a fee paid to the brokerage by the lender, a penalty on early discharge, a rate that is variable after an initial period. A strong answer identifies the fact, states who must be told, and picks the mechanism (written disclosure, escalation, or declining to proceed). Vague answers that merely 'advise caution' score poorly because they skip the identifiable obligation.
A Scenario Drill With a Self-Check Rubric
Run a repeating drill: take one fictional borrower file, compute both ratios, classify the LTV, summarize the mortgage structure in one line, and list every disclosure trigger. Score yourself against a fixed rubric each time.
Sample drill file: income $96,000/year; monthly mortgage payment $2,100; property tax $260/month; heat $110/month; car loan $520/month; credit card balance with $180 minimum payment; purchase price $610,000; down payment $105,000; five-year term, 25-year amortization. Compute: monthly income $8,000; GDS = 2,470/8,000 ≈ 30.9%; TDS = 3,170/8,000 ≈ 39.6%; loan $505,000 gives LTV ≈ 82.8% — high-ratio under the table above. Expected observations: you should catch the credit card minimum in TDS, flag the insurer lens, and note that no conflict facts exist in this file — recognizing absence is part of the skill.
Self-check rubric (score one point each, a learning milestone rather than a pass prediction): (1) GDS components correct and complete; (2) TDS includes all non-housing obligations; (3) divisions use monthly figures consistently; (4) LTV computed against the correct base; (5) financing classified and insurer implications named; (6) term/amortization/frequency summarized accurately; (7) all disclosure triggers identified or absence confirmed; (8) next step respects the sub-mortgage broker's supervised scope. Track your scores across five files; a consistent 7–8 suggests the mechanics are solid, while repeated misses point to the specific component to restudy.
- Use fictional files only; never practise with a real applicant's documents.
- Redo at least one calculation entirely by hand before checking with a calculator.
- Write the one-line mortgage structure summary before touching the ratios.
- Log rubric misses in a running list — the pattern is your study plan.
An Adaptable Preparation Sequence and Concrete Readiness Checks
Sequence your preparation in three passes: build the vocabulary and formulas, drill scenario files against the rubric, then rehearse the full decision path under time pressure, adjusting the pace to your schedule and prior exposure.
A realistic adaptable sequence: in the first pass, work through mortgage concepts — ratios, LTV, term versus amortization, payment mathematics — making your own one-page formula sheet; in the second pass, do two or three scenario drills per study session using the rubric above, and review missed components in course materials the same day; in the final pass, simulate decision conditions by completing a full file start-to-finish without notes, then audit it against the rubric. Compress or extend each pass based on your available hours and how stable your rubric scores are.
Readiness checks that are actually informative: you can compute GDS and TDS from a raw fact pattern with no component missed across two consecutive files; you can classify a file as conventional or high-ratio and name the consequences without prompting; you can read a commitment-style summary and restate term, amortization, and payment frequency correctly; and you can list the disclosure triggers present — or state why none exist — in a scenario. If any check fails, return to that section's drill rather than rereading broadly. For registration steps, course logistics, and current regulatory resources, refer to BCFSA's mortgage broker pages directly, as administrative details change and the regulator is the authoritative source.
References and further reading
Use these references to explore the concepts and check the latest information from the relevant organizations.