Underwrite to Today's Rent, Not Tomorrow's Hope
A rental property can be made to work on paper in two different ways, and the difference between them decides whether the purchase is safe. It can clear its costs on the rent and the price in front of you today, or it can clear them only on a rent and a price you expect to arrive later. The first is an investment. The second is a forecast with a deposit attached.
Conservative underwriting is the refusal to confuse the two. If the numbers hold at today's achievable rent and today's yield, the holding survives a flat market, and any recovery in rents or values becomes upside the owner did not need. If they hold only on an assumed rebound, the owner has bought hope and recorded it as an asset.
Two ways a deal can work
In a rising market the two methods converge, and the difference is easy to miss. Forecasts keep coming true, so underwriting to them looks like skill rather than borrowed luck. A cooling market separates them again. When sentiment is cautious, the forecast is the first thing to slip: rents soften, vacancies lengthen, and the exit price once penciled in stops being available on schedule. A deal that only worked on the forecast now does not work at all, and the owner funds the gap out of pocket, month after month.
A deal that worked on today's numbers keeps working, indifferent to the mood of the market, because it never depended on the mood in the first place. Underwriting conservatively is not pessimism. It is building the decision on the part of the picture that can be observed, and allowing the rest to be a bonus rather than a requirement.
Start with the rent you can see
The first input is achievable rent, and it is not the asking rent on comparable listings or the figure in a developer's projection. Asking rent is an opening position. Achievable rent is what signed leases in the same building, for a unit of the same size and condition, are collecting now. Those are different numbers, and in a soft letting market the gap widens, because advertised rents lag the point at which a tenant will actually commit. Take the lower, evidenced figure every time.
Then apply an honest vacancy assumption. A unit does not let for twelve months a year, and between tenants it sits empty for weeks, longer in a district still absorbing new supply. Model eleven months, sometimes ten. Underwriting to full occupancy at the headline asking rent is the most common way a sober-looking spreadsheet is persuaded to tell an optimistic story.
The yield you keep, not the one you are shown
Gross yield, annual rent over price, is a screening number. The decision rests on net yield, which is what remains after the asset has been operated for a full year. Subtract the costs that are real whether or not the model mentions them: management at a market rate, charged even if you intend to self-manage, because the holding must stand without you; co-ownership and sinking fund contributions; a reserve for the furniture and the air-conditioning that fail on their own schedule; and the rental withholding Cambodia applies to rent as it is paid, ten percent for residents and fourteen percent for non-residents as of 2026.
Because that withholding is charged on rent rather than on profit, it behaves as a cost of revenue, not a year-end afterthought. On a mid-market Phnom Penh unit these items commonly remove two to four points from the headline, which is how an advertised eight percent becomes a kept four. The net figure, not the gross, is the one every later step of the underwrite is built upon.
Debt that survives a flat year
The question about leverage is not whether today's net income covers today's loan payment. It is whether it still covers the payment when the rate is higher and the unit is emptier than assumed. Test debt service at a rate set meaningfully above the one on offer, at the lower occupancy, and require that the income clears it with room to spare. If a holding services its debt only at today's rate and full occupancy, the owner has not bought a property. They have bought an interest rate and an occupancy level, and both sit outside their control.
Lower leverage is the plainest margin of safety available. It costs a little return in the good year, and it is the reason the holding is still in the owner's hands in the flat one. In a market where financing for foreign buyers is limited and comparatively expensive, and where much of the activity is cash or developer installments, the discipline is less about sourcing cheap debt than about refusing to lean on debt the income cannot carry unaided.
A price with a floor under it
Underwriting to today's rent settles the income side. The price side needs the same honesty. A margin of safety is the distance between what you pay and what the asset is worth in a bad year, not a good one, so a discount to last year's price is not a margin of safety if last year's price was itself elevated. A more durable floor is replacement cost: the land, the construction, the fees, and the builder's margin it would take to produce the same unit new. When an existing asset can be acquired at or below what reproduction would cost, adding new competing supply becomes uneconomic, which tends to limit how much further the asset can drift down and relieves the pressure of fresh stock arriving beside it.
Pair that floor with a holding period measured in years rather than months, five to ten rather than a quick turn, and the owner is positioned to let income carry the asset while the cycle does whatever it is going to do. On this footing, recovery is upside. It is never the premise.
Cambodia, 2026
Phnom Penh in 2026 is a market that ran up over the previous decade and has since cooled into something more selective, with demand concentrated at the ends of the price range and generic mid-market stock moving slowly. That is precisely the environment in which the two ways of making a deal work come apart. A forecast of a swift return to the earlier pace is available and costs nothing to believe. Signed leases, honest vacancy, real operating costs, and replacement-cost math are harder work, and they are the only inputs that remain true if the earlier pace does not return on schedule.
An investor who underwrites to the rent a unit collects today, services any debt at a stressed rate, and pays at or below replacement cost owns a holding that does not need the market's permission to be sound. One who underwrites to the recovery owns the recovery's timing, and timing is the one thing no buyer controls.
The forecast is the most expensive line in any model, because it is the single line the market is under no obligation to honor.
Underwriting to today's rent is slow, conservative work, and more often than not it produces the decision to pass. It wins nothing in the month it is done, and it is the discipline that lets a soft-market purchase sit quietly in a portfolio long after the deals built on hope have been unwound.
At My First Corner, we run every holding through today's numbers before anyone mentions tomorrow's, so a client knows what the asset is worth if nothing improves. That analysis is here for you whenever it would help.
By Samuel Doe, MFC Invests.