How to calculate the actual profitability of a rental investment?

In the world of rental property investment, the figures displayed in real estate listings are often misleading. A dazzling 9% or 10% yield can quickly turn into a negative cash flow operation if expenses and taxes are not factored in. To build a solid portfolio, a good investor should not rely on theoretical promises, but on actual profitability.

What are the fundamental differences between gross, net, and net-net yields? What expenses must you include in your calculations? MeCaza provides you with a step-by-step mathematical method to accurately assess the performance of your property project.

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1. Gross Profitability: A necessary but incomplete first filter

Gross profitability is the most well-known and easiest indicator to evaluate. It serves as a first screening tool to quickly compare two properties in the same geographical area.

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The formula for gross profitability:

The pitfall to avoid: Omitting acquisition costs

For this initial indicator to be accurate, the "Total acquisition price" should not be limited to the net seller price of the property. It must necessarily include all additional costs related to the purchase:

• Notary fees (approximately 7% to 8% for existing properties).
• Agency fees or property finder fees.
• The estimated amount for renovation work (renovation, refreshing).

⚠️ Why is this rate incomplete?

Gross profitability operates on the fictional assumption that the owner has no expenses to pay and that the property is rented 365 days a year without interruption. It's a blind indicator when it comes to actual operating expenses.

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2. Net Profitability After Expenses: The reality on the ground

Net profitability precisely refines the property's performance by deducting all essential expenses related to its management and maintenance throughout the year.

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The formula for net profitability:

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What expenses should you deduct?

To get a realistic calculation, you must deduct the following items from your rental income:

1. Property tax: An annual local tax paid exclusively by the owner. Property tax is a major non-recoverable expense that directly impacts your net yield. Its calculation depends on the cadastral rental value of your municipality. Anticipate its cost and evolution by consulting our guide on property tax and real estate wealth tax (IFI).
2. Non-recoverable condominium fees: The portion of building expenses that legally remains your responsibility (property manager fees, major structural works).
3. Non-Occupying Owner (PNO) insurance: Mandatory coverage to protect your civil liability.
4. Rental vacancy: It is prudent to budget for a 2% to 4% vacancy rate (approximately 2 weeks of vacancy between tenants) to avoid skewing your projections.
5. Rental management fees: If you delegate management to an agency (expect between 6% and 10% of rental income).

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3. "Net-Net" Profitability: The Decisive Impact of Taxation

This is where the success or failure of your investment is determined. Net-net profitability is what actually ends up in your pocket after taxes. A single apartment can show a 6% net profitability and plummet to 3% net-net, or remain at 6%, depending on the chosen tax regime.

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The impact of unfurnished vs. furnished rental (LMNP)

• If you rent unfurnished (Property Income): Your profits are taxed at your Marginal Tax Rate (MTR: 11%, 30%, 41%...) + 17.2% in social contributions. For an MTR of 30%, the state levies 47.2% of your net gains.
• If you rent furnished (LMNP under the Actual Expense Regime): Thanks to the accounting depreciation mechanism, you can deduct the depreciation of the building structure and furniture from your income. In most cases, your taxable base drops to €0. Your net profitability then becomes your real net-net profitability. Article 39 ter of the General Tax Code sets the depreciation rules for furnished premises. Find details of eligible components on the website of the Official Tax Documentation (BOFiP).

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If you choose unfurnished rental, the impact of income tax can be significant. However, if you opt for furnished rental, you switch to the BIC regime. To understand how to leverage this within an overall asset strategy, read our guide to optimize your property portfolio.

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4. MeCaza Real Comparative Calculation Example

Let's take a concrete example of purchasing a large studio apartment in a mid-sized city, managed by an investor with an MTR of 30%:

• Net purchase price: 100 000€
• Additional costs (Notary + Finder + Renovations): 15 000€
• Total project cost: €115,000
• Rent: €600/month (or €7,200 per year)
• Total annual charges (Property tax, Landlord's insurance, Co-ownership fees): €1,400

See how this project performs mathematically at each stage of the calculation:

To accurately simulate the impact of your marginal tax rate (TMI) based on your family situation, you can use the Official Income Tax Simulator.

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💡 The MeCaza Expert's View

Chasing the highest gross yield is often a false economy. Double-digit gross rates are typically found in declining geographical areas, where the risk of rental vacancy is highest and the prospect of capital gains upon resale is non-existent.

A savvy investor also calculates their exit strategy: if you buy your own home or reallocate your assets, discover how capital gains on a secondary residence work to secure your resale profits.

A sound wealth management strategy seeks a balance: securing a location with high asset value (guaranteeing resale and tenant longevity) while leveraging the right tax incentives, such as LMNP status or land deficit, to maintain optimal net-net profitability. This surgical precision is what our MeCaza property finders apply to secure your cash flow. Discover our rental investment search services.

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FAQ: Your questions about yield calculations

What is the minimum acceptable property yield?

There is no single answer, as yield is the compensation for risk. In central Paris, a net yield of 3% to 3.5% is considered excellent due to the strong asset appreciation of the properties. In more dynamic mid-sized or student cities (Toulouse, Rennes, Clermont-Ferrand), an investor would typically aim for a net yield between 5% and 7%.

What is Return on Equity (leverage effect)?

Return on equity (or Return on Equity) measures the performance of the money you have personally invested in the project (your equity contribution). If you contribute €20,000 for a €150,000 project and the property generates a net cash flow of €1,000 per year once the loan is repaid, your return on equity is 5%, even though the gross yield of the building may be lower.

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