The displayed profitability of a rental investment often masks a less flattering reality. Between the gross yield announced by a seller and the actual cash flow after taxes, charges, and rental vacancy, the gap can turn an apparently solid project into a neutral or even loss-making operation. Measuring this gap before purchasing is crucial for the success of a real estate investment in 2024.
Gross, net, and net-net yield: the gaps that change the decision
The gross yield is calculated by dividing the annual rents by the purchase price. This ratio, easy to obtain, circulates in most listings. It does not reflect the actual performance of the investment.
The net yield includes condominium fees, property tax, non-occupant owner insurance, and rental management fees. The net-net yield, sometimes referred to as “net after taxes,” additionally subtracts the applicable taxation on rental income or BIC depending on the chosen regime.
| Indicator | What it includes | What it ignores |
|---|---|---|
| Gross yield | Annual rents / purchase price | Charges, taxation, vacancy, maintenance |
| Net yield | Rents – charges – property tax – management | Tax on rental income, vacancy |
| Net-net yield | Rents – charges – full taxation | Rental vacancy (to be estimated separately) |
| Cash flow after financing | Net-net yield – loan installments | Potential capital gain upon resale |
The line for cash flow after financing determines whether the operation is self-financing or requires a monthly savings effort. An attractive gross yield can produce a negative cash flow as soon as the actual cost of credit and taxation are factored into the calculation.
To compare properties or evaluate a project before commitment, you can access the Immo Prima website to consult detailed simulations by property type and location.
Rental format and local market: an underestimated arbitration
Unfurnished, furnished, shared housing, short-term: each format produces a different level of income and constraints. A common trap is to choose a format solely for its tax advantage without checking local demand.
- Furnished rental (LMNP) allows for the accounting depreciation of the property and furniture, significantly reducing the taxable base. It assumes a demand for mobile tenants (students, professionals on assignment) and a higher turnover rate.
- Unfurnished rental offers longer leases and generally lower vacancy rates in medium-sized cities with a high resident population. The net profitability then depends on the chosen tax regime (micro-property or actual).
- Shared housing increases the yield per square meter but requires more active management: turnover of roommates, increased maintenance, drafting individual leases.
- Short-term rentals generate the highest gross income in tourist areas. However, operating costs (cleaning, laundry, platform, municipal regulations) compress the net margin.
The most profitable format on paper is not necessarily the one that performs best everywhere. A shared housing arrangement in a city without a student population produces vacancy. A tourist furnished rental in a municipality that caps the allowed nights sees its yield diminished.
Analyzing the local market involves looking at rental tension (the ratio between supply and demand for housing), the price per square meter at purchase, and the median rent practiced. These three data points, cross-referenced with the envisaged format, allow for projecting a realistic yield.
Real cost of credit and leverage effect: what the rates change
The leverage effect of real estate credit is based on a simple principle: borrowing at a rate lower than the net yield of the property so that the differential finances part of the investment. This mechanism, long presented as an automatic wealth accelerator, deserves a more cautious examination.
When the borrowing rate approaches the net yield of the property, the leverage effect becomes marginal or null. The monthly cash flow turns negative, and the investor must inject savings each month to cover the difference between the installments and the rents received.
A prior calculation of the total cost of credit (cumulative interest, borrower insurance, processing fees, guarantee) related to the expected net-net yield over the holding period provides a reliable picture of performance. If the total cost of financing absorbs most of the rental yield, the operation then relies almost exclusively on the capital gain upon resale, which introduces market risk.
Post-purchase management: profitability is determined after the signature
Most content on rental investment focuses on the acquisition phase. However, long-term management weighs just as much on the final result.
Reassessing the rent at the right time protects the yield against inflationary erosion. The reference rent index (IRL) frames this reassessment for residential leases, but it must still be applied at each contractual deadline.
Preventive maintenance of the property (boiler, waterproofing, common areas) reduces the expenses of unforeseen major works. A well-maintained property also limits rental vacancy: tenants stay longer in a property in good condition.
Adjusting the rental strategy during the holding period is part of the management. Switching from an unfurnished rental to a furnished one after a tenant change, or refinancing the loan if the rate conditions evolve favorably, are concrete levers to improve cash flow without a new purchase.
The profitability of a real estate investment is measured over the total holding period, not just at the time of purchase. A property acquired at a good price but poorly managed for ten years produces a result lower than a property paid at market price with rigorous rental management. Regular monitoring of indicators (occupancy rate, actual charges, applied taxation) remains the only way to verify that the project meets its initial promises.