Most people lose money in US real estate the same way: they underwrite the purchase carefully and the operation casually.
This is a framework piece rather than a market call. Current rates, regional price movements, and inventory levels change constantly — read those from FRED, the Census Bureau, or your local MLS rather than from a blog. What follows is the structure of the decision, which does not change.
Appreciation is not a plan
The single most common error we see in property underwriting is a model that only works if the asset appreciates.
Appreciation is a bonus. It is not a strategy, because you do not control it, cannot time it, and cannot pay a mortgage with it.
The test: if the property never appreciates a single dollar, does it still produce an acceptable return from operations alone? If no, you are not investing. You are speculating with leverage, which is a legitimate thing to do deliberately and a dangerous thing to do accidentally.
The costs that break otherwise-good deals
Purchase price and mortgage payment are the two numbers everyone models. Here are the ones that actually decide outcomes:
- Insurance. In several US markets this has moved from a rounding error to a line that can invalidate a deal outright, particularly in coastal and wildfire-exposed regions. Get an actual quote for the actual property before you commit, not a regional average.
- Property taxes, and reassessment on sale. In many jurisdictions your tax basis resets when you buy. Modelling the seller's tax bill instead of yours is a common and expensive mistake.
- Vacancy. Not "it might be empty sometimes" but a specific percentage, applied every year, based on the actual local market.
- Maintenance and capital reserves. A roof, an HVAC system, and a water heater all have finite lives and known replacement costs. A model without a capital reserve line is not finished.
- Management. Whether you pay a manager or do it yourself, it costs. If you do it yourself, you have bought a job — price your own time in.
Rate sensitivity is the stress test that matters
Any leveraged asset is a bet on financing cost. The question is not what rates are today but what happens to your position if they move against you before you refinance or exit.
The test we use: model the deal at a materially worse financing cost than you expect. If it still clears your minimum return, the deal is robust. If it only works at today's rate, you are relying on a variable you do not control.
This applies with particular force to anything with a balloon or a short fixed period.
Where the operational edge actually is
Small portfolios rarely lose to big ones on deal access. They lose on operations:
- Slow turnovers between tenants, each empty week a direct cost
- No system for maintenance requests, so small problems become large ones
- Rents left below market for years because nobody scheduled a review
- Bookkeeping so loose that the true return is unknown
None of that is glamorous and all of it is fixable with systems. It is the same discipline that makes any operating business work, applied to property.
A worked underwriting line
The figures here are illustrative, to show the shape of the calculation rather than any particular market.
Take a property at 300,000 with 25 percent down, renting at 2,400 a month.
Gross annual rent is 28,800. The mistake is stopping there and comparing it to the mortgage payment.
Now subtract, honestly:
- Vacancy at a realistic local rate, not zero
- Property tax at your reassessed basis, not the seller's
- Insurance at an actual quote for this property
- Maintenance as a percentage of rent, not a guess
- Capital reserve for roof, HVAC and water heater on their real replacement cycles
- Management at market rate, even if you self-manage
What remains is net operating income. Compare that to the purchase price for your capitalisation rate, and to your debt service for your actual cash flow.
The point is not the specific figures. It is that six of those seven lines are routinely omitted, and together they frequently consume more than a third of gross rent. A model missing them does not overstate returns slightly. It overstates them structurally.
Market types behave differently
High-appreciation, low-yield metros. Coastal and major-metro markets where prices have outrun rents. Cash flow is difficult and the return case leans heavily on appreciation, which puts it squarely in the speculation category unless you have a specific thesis.
Cash-flow markets. The Midwest and parts of the South, where yields work but appreciation is modest and local economic concentration is a real risk. A single large employer leaving changes the picture.
Transitional markets. The most interesting and the hardest. Requires genuine local knowledge, which almost no remote investor has, whatever they tell themselves.
Choose the category deliberately. Most investors pick a market for reasons that amount to familiarity, then apply a strategy suited to a different category entirely.
Operational systems that protect returns
- A written turnover checklist, so vacant weeks become vacant days
- A single channel for maintenance requests with a response standard
- A scheduled annual rent review, diarised rather than remembered
- Bookkeeping separated per property, so you know which one is actually earning
- Reserves held in cash, not notionally
How RNM thinks about this
We are not brokers and we do not sell deals. Our involvement in property is operational: the modelling, the systems, and the discipline that decide whether a portfolio produces a return or merely produces activity.
That work also runs through Abaad Real Estate, our own property venture — which means the frameworks here are ones we apply to our own capital, not just advice we hand to clients. Building and operating in property yourself changes how you read a pro forma. It makes you far more sceptical of the optimistic lines.
If you are evaluating US property and want the model stress-tested by someone with no commission in the outcome, that is a conversation we are happy to have.
