How to analyze the profitability of a rental property

A building that collects rent is not automatically profitable. It is a common and costly mistake in real estate investing: confusing what a building takes in with what it actually earns. Two buildings with similar rents can have very different profiles once expenses, financing and risk are taken into account.

At Immo Alliances, no project moves forward without a profitability analysis. Here are the metrics that matter for judging a building with rigour rather than by instinct.

Why one metric is never enough

There are several ways to measure profitability, and each one tells a different story. A high cap rate can hide a negative cash flow, since it ignores financing. A positive cash flow can hide a mediocre return on the capital invested. A single number is therefore not enough. Several metrics have to be cross-checked to get a complete picture, then validated against the building's real data, not just the figures declared by the seller.

Price per door, then per room: the first filter

Price per door is often the first calculation to run. Divide the purchase price by the number of units, then compare the result with recent transactions in the same area, for the same type of building. This quickly flags a building whose price departs from the market, in either direction.

But two units are not equivalent if they are not the same size. So the analysis goes one step further, to the price per room, which puts every building on a common basis and makes the comparison fairer. These two benchmarks are used to sort opportunities and decide which ones deserve a deeper analysis. They are never a verdict.

Cap rate: what the building really earns

Price per door says nothing about income. That is where the capitalization rate, or cap rate, comes in. It is calculated by dividing net operating income, meaning revenue minus operating expenses before financing, by the purchase price. It makes it possible to compare a building with comparable transactions, by type and location.

Its reliability, however, depends on the quality of the numbers behind it. The revenue and expenses provided by the seller are declared figures, and a cap rate built on unverified data gives a false impression of precision. Hence the importance of complete, rigorous due diligence before relying on it.

The cap rate does not tell the whole story: latent CAPEX

Two buildings can show the same cap rate and represent two very different investments. The reason lies in what the number does not show: the capital expenditures, or CAPEX, that are coming. A roof at the end of its life, a façade to redo, original plumbing, mechanical systems to replace: this work does not appear in current expenses, but it will fall on the new owner.

To account for it, the work is estimated at its probable due date, then brought back to today's value by discounting the cash flows. A roof to replace in two years weighs far more heavily in the decision than the same roof in fifteen years. The resulting value is used to adjust the price or the net income, and therefore the cap rate. A building with a higher starting cap rate can thus become less attractive than its neighbour once the work is factored in. A cap rate without this reading compares numbers, not buildings.

Cash flow and debt coverage

Cash flow is the money that actually remains once all expenses are paid, debt service included. It shows whether the building pays for itself or asks the owner for additional money. A good cap rate does not guarantee a positive cash flow: everything depends on the financing that goes with it.

Lenders measure this strength with the debt service coverage ratio, or DSCR. It is calculated by dividing net operating income by annual debt payments. A ratio of 1.25 means the building generates 25% more than it has to repay. Thresholds vary by lender, building type and financing program.

What the invested capital really earns

Once the building's strength is established, the question changes: what does the money actually invested earn? Cash-on-cash compares annual cash flow with the capital paid out, meaning the down payment and acquisition costs. It is an annual return on equity. The more a building is financed by debt, the higher this figure can appear, even if the return on the asset is modest. It should therefore always be read alongside cash flow and debt coverage.

ROI widens the reading: it compares the total gain over the life of the project with the capital invested, taking into account the cash flows received and the value of the building. Net present value, or NPV, adds the notion of time. It brings future cash flows back to today's value, at the required rate of return, then subtracts the initial outlay. A positive NPV indicates that the investment earns more than that required return.

Projections, but well-founded ones

ROI and NPV rely on projections, like any building analysis. There is no analysis without assumptions about the future, whether for revenue, expenses, work or financing. What matters is knowing what they rest on. At Immo Alliances, they rest on available market reports, on our experience and on our knowledge of the areas where we invest. We then test them with a sensitivity analysis, which measures the effect of a rate increase, a longer vacancy or work that costs more than planned.

Rigour applied to every project

At Immo Alliances, every project is analyzed with discipline: several cross-checked metrics, verified data and on-site validation. That rigour frames our decisions, from acquisition to management.

Follow us to learn more about how we analyze and build a durable, healthy real estate portfolio.

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