Treat CMPS-style mortgage planning as a set of boundary-conditioned decision rules: fixed versus adjustable decided by holding period and the capped worst-case payment; points decided by break-even month versus the client's timeline; extra principal decided by reserve adequacy and higher-cost debt; ratios read as interacting limits; and ethics answers built on disclosure and referral. Work the two scenarios, internalize the product-fit table before memorizing anything, then run the four-week case sequence and its 0-2 rubric to confirm the constraint-first habit.
Reading planning cases as constraint problems, not product quizzes
A planning case presents several technically available loans; the client's facts make most of them wrong. Extract four constraints — time horizon, monthly cash-flow floor, liquidity reserve, and risk posture — and eliminate options against them before comparing rates.
A rate quote is real but incomplete: two clients with identical credit can justify opposite structures because their facts differ, not their qualifications. The facts that decide cases sit inside the narrative — a planned relocation, unevenly timed bonus income, a teenager two years from college. Practice extraction explicitly: read the case once, then write each material fact as a labeled constraint. 'Relocates within two years' is a horizon constraint; 'must keep total obligations under a stated ceiling' is a cash-flow constraint. Evaluate loan options only after that list is complete.
This framing explains why the best-looking option often survives every qualification check and still fails: ratios pass, pricing is competitive, and a horizon or liquidity constraint eliminates it. Distinguish constraints from preferences. A constraint eliminates an option outright; a preference only reweights it. When you review practice cases, write one sentence naming the constraint that removed the most attractive option. If you cannot produce that sentence, you matched products by impression rather than by the client's stated situation — the habit the rubric in the final section is designed to catch.
Fixed vs. adjustable: run the horizon and worst-case payment test
Decide with two computations, not a rate comparison: the expected holding period and the fully indexed worst-case payment built from index, margin, and caps. A horizon shorter than the adjustment window changes which option survives.
The fully indexed rate is index plus margin — it, not the teaser start rate, drives payments after adjustment, and the caps define the worst case. Work the labeled example: a $400,000 loan at a 4.5% start rate carries about a $2,027 payment; if the first adjustment hits the 2% initial cap, the rate becomes 6.5%, and on a remaining balance near $364,600 the payment approaches $2,460 — roughly a 21% jump. The planning question is whether the client's cash-flow floor absorbs that worst case, not whether the start payment feels comfortable.
The horizon side is where cases hide their decision. A client who credibly expects to sell or refinance inside the fixed period can fit an adjustable structure; the error is letting the teaser rate decide when the horizon is a plan rather than a constraint. 'Plans to move eventually' is a preference; 'accepted a position requiring relocation by a fixed date' is a constraint. Stress-test both branches: the cost if the client stays past the adjustment and the cost if they leave early. Whichever branch hurts more tells you what to clarify with the client.
| Structure | Planning signal that fits | Cash-flow effect | Stress-test before recommending |
|---|---|---|---|
| 30-year fixed | Long horizon; payment certainty prioritized | Lowest mandatory payment among fully amortizing fixed options | Opportunity cost of the higher rate versus shorter terms |
| 15-year fixed | Long horizon; payoff speed prioritized; durable surplus | Higher payment; faster equity build | Whether the payment crowds out the emergency reserve |
| Hybrid ARM | Horizon likely inside the fixed period; strong liquidity | Lower early payment; resets later | Fully indexed payment (index + margin) and the capped worst case |
| Interest-only period | Irregular income needing payment flexibility | Lowest early payment; no principal reduction during the period | Payment shock when amortization resumes |
| Cash-out refinance or HELOC | Converts equity to liquidity for a defined use | Larger balance or a second payment | Whether the use builds an asset or funds consumption |
DTI and LTV: ratios as interacting limits, not pass/fail scores
Front-end and back-end debt-to-income ratios measure payment burden against income; loan-to-value measures leverage against property value. They interact: a structure that lowers the monthly payment can still raise risk by slowing amortization or enlarging the balance.
Define them operationally. The front-end ratio divides the proposed housing payment by income; the back-end adds all recurring debt obligations. A client with modest housing costs and heavy consumer debt can pass the front-end limit and fail the back-end — the two ratios point in different directions because they count different debts. Structures change them differently too: extending the term or using an interest-only period lowers the housing payment and improves both ratios, even though it slows equity building. That gap between passing the ratio and fitting the plan is what case questions probe.
Loan-to-value is the loan balance divided by property value, and combined loan-to-value when a second lien or cash-out amount is layered on. Equity becomes spendable only through a larger loan, a second lien, or a sale — so when a case says the client wants 'access to equity,' the planning questions are purpose and repayment, not just availability. Also watch amortization speed: many programs permit private mortgage insurance to be addressed once the balance and value support it, and a structure that slows principal reduction postpones that point.
Points and refinance break-even: match the math to the timeline
Discount points are prepaid interest. Cost equals points times loan amount; monthly savings is the payment difference; break-even is cost divided by savings. Compare the break-even month with the client's expected holding period — and with how confident that estimate is.
Scenario: a $300,000 refinance offers a rate 0.5% lower for 2 points — $6,000 — saving $150 monthly, so break-even lands at month 40. The client says she expects to relocate in about two years. The plausible mistake: recommending the points because the monthly savings sound impressive, quoting '$150 back every month' while never dividing cost by savings. If she sells at month 24, she will have collected $3,600 in savings against $6,000 paid — a net loss of roughly $2,400, and points are not refunded at payoff.
The better decision is the no-point option — or, if her timeline firms up, revisiting before locking. The general rule: include every cost that differs between options (points, differing lender fees) in the numerator, and treat the horizon as a range. If she might stay eight years, points win; if two, they lose; when genuinely uncertain, price both and ask which mistake she would rather own. That reframes break-even from a single number into a decision under an uncertain timeline — the form this choice takes in real files.
Prepayment, liquidity, and the equity tradeoff cases embed
Extra principal payments build equity and cut total interest, but they convert liquid cash into illiquid home equity. Weigh prepayment against the client's emergency reserve and any higher-cost debt before treating it as the default safe choice.
Scenario: a client has $500 of monthly surplus, a thin reserve, and a credit card balance costing around 24% APR, and asks about adding $500 monthly to the principal of a 6% mortgage. The plausible mistake: agreeing, because 'paying off the house is always good.' Every prepaid dollar earns a guaranteed return equal to the note rate — 6% — while every dollar sent to the card avoids a 24% cost. The better sequence: eliminate the highest-cost debt, rebuild the reserve to a stated months-of-expenses target, then prepay from durable surplus.
The underlying lesson is that net worth, cash flow, and liquidity are different planning objectives, and maximizing one can starve another. Equity locked in a home cannot be withdrawn quickly in a job loss, which is why reserve adequacy comes first in the decision order. Case answers often hinge on which objective the client actually stated — 'be debt-free by 60' and 'keep payments manageable while the business matures' lead to different structures at identical numbers. Where tax treatment of mortgage interest is relevant, flag it and refer the client to a tax professional.
Documentation and ethics scenarios: when the defensible move is a referral
Documentation scenarios test completeness and consistency — income, assets, liabilities, and explanations that reconcile the file. Ethics scenarios test boundaries: disclose compensation and conflicts, verify rather than assume, and refer tax and legal judgments to qualified professionals.
Read a case file twice: once for the plan, once for the gaps. A stated income that does not match the described employment, a large recent deposit without explanation, or an employment gap is the scenario asking what you would obtain or document — because a payment plan built on unverified income is fragile regardless of how well the structure fits. Practicing this second read changes what you notice: the constraint is often a documentation fact, not a product fact, and the correct move is completing the file before promoting a recommendation.
Ethics scenarios probe boundaries in both directions. When a scenario includes two eligible options with different payouts to you, the test is disclosure — the client should be able to see how you are compensated — not silent steering either way. When numbers tempt you to compute a tax outcome or interpret a legal document, the defensible answer states the planning observation, flags the interaction, and routes the judgment to the appropriate professional. Declining to proceed is sometimes the right answer when the file cannot support the plan the client wants.
A case-first four-week sequence with a rubric and readiness checks
Sequence study around cases rather than chapter order: mechanics first because cases depend on them, then constraint mapping, then timed mixed cases with an error log sorted by decision rule. Readiness is behavioral, not a page count.
A workable sequence: Week 1, mechanics drills — compute payments at different rates, a fully indexed rate, a capped worst case, and ratios from a raw fact pattern. Week 2, decision rules — rebuild the product-fit table from memory and defend each row against a client profile. Week 3, full cases — write the constraint elimination for each before any recommendation. Week 4, timed mixed cases plus error-log review. Compress or expand weeks based on which topics dominate your practice materials; the order — mechanics, rules, cases, timing — is the transferable part.
Exercise: take ten practice cases and record four things for each — the four constraints, the option the rate alone would pick, the constraint that eliminates it, and your recommendation with a one-sentence defense. Score each case 0-2: two if you named the deciding constraint without rereading, one if you needed notes, zero if you chose on rate. A 16/20 total is a reasonable milestone that the decision-rule habit is forming — a learning marker, not a passing prediction. For administrative matters such as eligibility and scheduling, confirm current requirements with the CMPS Institute directly.
- Cold-compute a points break-even month and an ARM worst-case payment from a fresh fact pattern in a few minutes each, without references.
- Given a new case, state which constraint eliminates the lowest-rate option before stating any recommendation.
- Explain in one sentence why front-end and back-end DTI can point in different directions for the same client, and in another why slower amortization delays insurance removal.
- Recognize the scenarios where the right move is a tax or legal referral, or declining to proceed, and articulate why in a sentence.
References and further reading
Use these references to explore the concepts and check the latest information from the relevant organizations.