A rental property investor who relies solely on the gross yield shown in a listing is taking a real financial risk. This attractive figure, often above 6 or 7%, takes into account neither non-recoverable charges, nor taxation, nor rental vacancy. In 2026, the gap between gross yield and net-net yield frequently reaches 30 to 45%, which can turn an apparently profitable project into one that barely breaks even. Understanding this mechanism is therefore the first step before any purchase intended for rental.
In summary
- The gross yield, which is often emphasized, ignores all the charges and taxation linked to owning the property.
- The net-net yield, which factors in charges, rental vacancy and taxes, is the only reliable indicator for a rental property investor.
- Items such as the taxe foncière (property tax), co-ownership charges, rental management or renovation work are frequently underestimated at the time of purchase.
- Support from a professional makes it possible to objectify the calculation and avoid unpleasant surprises after the acquisition.
Why the gross yield is misleading
The gross yield is calculated very simply: just divide the annual rent received by the purchase price of the property, then multiply by 100. This simplicity makes it a formidable marketing argument, but also an incomplete indicator for any serious rental property investor.
A calculation that ignores the reality of ownership
The gross yield deducts no charges: neither the taxe foncière, nor co-ownership fees, nor insurance, nor taxation on the rental income received. It gives a static, optimistic picture, whereas actual profitability is determined over the holding period and across all financial flows, both incoming and outgoing.
A tool for comparison, not for decision-making
The gross yield remains useful: it makes it possible to quickly compare several properties with one another, provided one never stops there. It should be regarded as a first filter, never as the final criterion before signing a compromis de vente (preliminary sales agreement).
From gross yield to net yield: the charges to include
Moving from the gross yield to the net yield involves subtracting all charges that cannot be recovered from the tenant. These charges generally represent 20 to 30% of total co-ownership charges, but their cumulative weight can significantly affect final profitability.
The taxe foncière, an often understated item
For a standard property, the taxe foncière averages €1,000 to €1,500 per year, an amount that varies greatly depending on the municipality and tends to rise every year. Many project owners only discover it after the purchase, having failed to ask the seller or the agency for the exact amount.
Co-ownership charges and insurance
The non-recoverable share of co-ownership charges is generally between €300 and €500 per year, to which is added non-occupying owner insurance (PNO) of around €150 to €200 per year. These amounts, taken in isolation, seem modest, but when added to the other items they change the equation significantly.
Rental vacancy, the most underestimated risk
Rental vacancy refers to the periods during which the property remains unoccupied between two tenants, generating no rent. It is one of the parameters most frequently overlooked in the optimistic simulations offered to a novice rental property investor.
A direct impact on yield
A single month of rental vacancy over the year already represents a loss of about 8% of the annual gross rent. In B2 or C zones, average vacancy can exceed two months per year for an unrenovated studio, which weighs all the more heavily on the property's actual profitability.
Anticipating this risk from the time of purchase
The choice of location, the condition of the property and the level of rent requested relative to the local market directly determine the length of vacancy. A poorly positioned property, even with a high advertised yield, can experience repeated slack periods that cancel out the initial advantage.
Rental management and renovation work: recurring costs not to be overlooked
Beyond fixed charges, the day-to-day management of the property generates costs that must be built into the financing plan from the outset, otherwise the profitability calculation will be durably skewed.
The cost of delegated rental management
When management is entrusted to a professional, fees generally represent 8 to 10% of the rent collected, i.e. between €670 and €840 per year for an average rent. This service has a cost, but it secures the relationship with the tenant and limits the risk of unpaid rent or prolonged vacancy.
Maintenance and renovation work
A rental property requires regular maintenance and, at regular intervals, heavier works: boiler replacement, facade renovation (ravalement), energy-efficiency upgrades. These expenses, often left out of initial simulations, must be provisioned for each year to avoid a cash-flow shock when they become unavoidable.
Net-net yield: taxation changes everything
The net-net yield is the most comprehensive level of calculation, since it also factors in the taxation applicable to rental income. It is the only figure that truly reflects what the investment earns once all deductions have been made.
The weight of income tax and social contributions
Depending on the tax regime chosen, the rent received may be subject to income tax at the household's marginal rate, as well as to social contributions (prélèvements sociaux) of 17.2%. This combination can drastically reduce the net yield, particularly for investors who are already heavily taxed.
The benefits of LMNP status under the real regime
The status of non-professional furnished landlord (loueur en meublé non professionnel, LMNP) under the real regime (régime réel) makes it possible, thanks to the depreciation mechanism, to bring taxation on rent down to a level close to zero for ten to fifteen years in many cases. It is one of the most effective levers for preserving an attractive net-net yield, provided that its rules are properly mastered.
How to calculate a reliable net-net yield
The reference formula consists of subtracting all non-recoverable charges and taxation from the annual rent received, then dividing the result by the total acquisition cost, including notary fees and renovation work.
The detailed formula to apply
In practice: (monthly rent × number of months occupied – property tax (taxe foncière) – annual charges – social contributions – income tax) divided by (purchase price + notary fees + renovation work), all multiplied by 100. This complete formula gives a much more honest picture than the simple rent-to-price ratio shown in the listing.
Benchmarks to position your project
In 2026, a net-net yield of between 3 and 5% is considered realistic for an optimised rental investment, while a net yield above 4% remains satisfactory in major cities, where high purchase prices mechanically pull profitability downward. These benchmarks make it possible to check whether a project is consistent before committing.
Securing your project with the right tools and the right support
Given the complexity of the profitability calculation, relying on reliable data from the start changes everything. Comparing the targeted property with similar property listings in the same area makes it possible to check that the purchase price and the expected rent are consistent with the local market.
Verifying the property's true value
Before calculating a yield, you must first make sure that the purchase price matches the market value. An accurate property valuation, carried out by a professional who knows the area, avoids overpaying for a property and thereby artificially undermining the future yield.
Relying on a local professional
A nearby real estate advisor knows the specifics of the local rental market: rent levels charged, observed vacancy rate, typical co-ownership charges in the area. This level of detail, which is difficult to obtain on your own, often makes the difference between a profitable project and a disappointing one.
Conclusion
The yield shown in a listing is never the real yield. For any rental property investor, the only serious approach is to break the calculation down into three steps: gross yield, net yield after expenses, and then net-net yield after taxes and rental vacancy. It is this last figure, often 30 to 45% lower than the gross figure that is highlighted, that should guide the purchase decision. Working with a real estate professional makes each step of this calculation more reliable and helps avoid disappointments that weigh on long-term profitability.
The expert's view
"Gross yield is a classic trap for the novice rental property investor: it gives the illusion of double-digit profitability, whereas the reality, once expenses and taxes are deducted, is often much more modest. I regularly see project owners drawn in by a figure displayed in a listing, without having factored in the taxe foncière (property tax), condominium charges, rental vacancy between two tenants, or the cost of delegated management. The real work begins precisely where gross yield stops: you have to rebuild, item by item, the net yield and then the net-net yield, taking into account the chosen tax regime and the work to be planned over the coming years. At Capifrance, our advisors support investors in this detailed analysis, drawing on knowledge of the local market and on comprehensive simulations, so that the purchase decision rests on solid figures and not on a sales promise. A property showing a 7% gross yield can turn out to be less attractive than one showing 5%, if the latter is located in an area where rental vacancy is almost nil and expenses are under control. It is this overall vision, covering both asset management and taxation, that makes it possible to secure a rental investment over the long term."
— Frédéric Rémy, Director of Commercial Performance at Capifrance
FAQ - Frequently asked questions
What is the difference between gross yield and net yield?
Gross yield divides annual rent by the purchase price, with no deductions. Net yield additionally subtracts non-recoverable expenses such as the taxe foncière (property tax), condominium charges and insurance.
What is net-net yield?
It is the net yield from which taxation on rental income is deducted, that is, income tax and social contributions (prélèvements sociaux) of 17.2%. It reflects the real gain after all deductions.
What net-net yield should you aim for in 2026?
A net-net yield of between 3 and 5% is considered realistic for a well-optimized rental investment, notably through LMNP (furnished non-professional landlord) status under the régime réel (actual-expenses tax regime).
How can you limit the impact of rental vacancy?
Choosing a sought-after location, adjusting the rent to the local market and maintaining the property reduce the length of vacancy between two tenants, an item that can account for several points of lost yield.
Why consult a real estate advisor before investing?
A local professional brings detailed knowledge of the rents charged, typical expenses and the level of vacancy in the area, essential data for calculating a reliable net-net yield before purchase.
Author
Frédéric Rémy – Director of Sales Performance
A real estate professional with several years of experience within the Capifrance network, I would like to share essential advice with you to help you successfully complete your property project with our advisors.
