Key Concepts

Gross yield is the simplest ratio, often highlighted by real estate agents. It only considers the annual rent relative to the total purchase price (including notary fees). It is useful for quickly comparing two properties, but it is far from sufficient for making an investment decision.

Net yield refines the calculation by deducting all recurring charges: property tax, non-occupant owner insurance (PNO), property management fees, maintenance provisions, and estimated vacancy. This rate reflects the actual operational performance of the property.

Net-net yield (or after-tax yield) goes even further: it includes the tax impact, meaning income tax on rental income (based on your tax bracket, or TMI in France) and social contributions of 17.2%. This is the only indicator that truly tells you how much your investment earns in your pocket.

The difference between these three rates can be dramatic. A property advertised at 8% gross yield can drop to 5.5% net and 3.5% net-net for an investor in the 30% tax bracket. This is why you should always think in net-net yield before making a decision.

Cash flow is the difference between all money coming in (rent) and all money going out (mortgage payment, charges, taxes, income tax) each month. It is the most concrete indicator because it tells you exactly how much money stays in your pocket (or how much you need to contribute) after paying everything.

Positive cash flow means the investment is self-financing: rent covers all expenses and there is a surplus. This is the holy grail of rental investment. Negative cash flow requires a monthly "savings effort": you must contribute from your own pocket to cover expenses.

Negative cash flow does not necessarily mean a bad investment. If the property appreciates significantly or you benefit from substantial tax advantages, the overall return (IRR) can remain excellent. But excessively negative cash flow can jeopardize your borrowing capacity and limit future investments.

To improve cash flow, several levers exist: extend the loan duration (lower monthly payments), increase rent (co-living, furnished, short-term rental), reduce charges (renegotiate insurance, self-management), or optimize the tax regime (LMNP real regime, rental deficit).

The TMI (Tranche Marginale d'Imposition) is the tax rate applied to your last euro of income. In France, income tax is progressive: the first euros are taxed at 0%, then 11%, 30%, 41%, and finally 45% for the highest bracket. Your TMI corresponds to the bracket where your last euro of income falls.

This is crucial for rental investment because rental income (whether "revenus fonciers" for unfurnished or BIC for furnished) is added to your other income and taxed at your TMI. If you are in the 30% bracket, each euro of taxable rental income will be taxed at 30% income tax.

But that is not all: you must add social contributions of 17.2% (CSG-CRDS). The total tax burden on your rental income is therefore TMI + 17.2%. For a taxpayer in the 30% bracket, this represents 47.2% taxation on each euro of net rental income.

The 2026 tax brackets (2025 income) for one tax share are: 0% up to EUR 11,600, 11% from EUR 11,601 to EUR 29,579, 30% from EUR 29,580 to EUR 84,577, 41% from EUR 84,578 to EUR 181,917, and 45% above EUR 181,917. Understanding your TMI is the first step to optimizing the taxation of your investments.

LMNP (Loueur Meuble Non Professionnel) is a tax status allowing you to rent a furnished property as a non-professional. To qualify, furnished rental income must remain below EUR 23,000 per year OR represent less than 50% of the household's total income. The property must be equipped with sufficient furniture for immediate occupancy (regulatory list of 11 minimum items).

Two sub-regimes exist. Micro-BIC offers a flat 50% deduction on revenue (30% for unclassified tourist rentals since 2024), with no need to justify actual charges. It is simple but rarely optimal. The threshold is EUR 77,700 in annual revenue (EUR 15,000 for unclassified tourist rentals).

The Real Regime (Regime Reel) allows you to deduct all actual charges AND depreciate the property and furniture. Depreciation is a "virtual" accounting charge: you deduct a fraction of the property's value each year without spending a single euro of cash. It is as if the tax authorities reimburse part of the purchase price through tax savings.

Depreciation periods: the building (excluding land, approximately 80% of the price) is depreciated over 25 to 30 years, renovation works over 10 to 15 years, and furniture over 5 to 10 years. Depreciation cannot create a deficit (unlike charges), but unused surplus carries forward indefinitely to future years.

LMNP under the real regime is often the most advantageous because depreciation reduces taxable income to near-zero for many years, making rental income virtually tax-free. This is why most savvy investors prefer furnished rental.

Important 2025 reform: since February 15, 2025, depreciation deducted under LMNP is reintegrated into the capital gains calculation at resale (article 84, law no. 2025-127, Finance Act 2025). In practice, when selling the property, the taxable capital gain is calculated by subtracting from the sale price not the original purchase price, but the purchase price reduced by the depreciation taken. This reform aligns LMNP tax treatment more closely with the SCI under corporate tax and significantly impacts the exit strategy. It is now essential to factor this parameter into your IRR simulations.

Deficit foncier is a powerful tax mechanism that applies to unfurnished rental under the real regime. It occurs when deductible charges (renovation works, loan interest, insurance, management fees) exceed rental income. The difference constitutes a deficit that can be offset against your global income.

The rental deficit can be offset against global income up to EUR 10,700 per year. Since 2023, this ceiling is doubled to EUR 21,400 for energy renovation works. Since the 2026 Finance Act (art. 12), this doubled cap is restricted to F or G rated properties only (class E is no longer eligible) whose works reach class A, B, C or D. Scheme extended to 31/12/2027. The portion of the deficit exceeding this ceiling carries forward against rental income for the next 10 years.

The essential condition: you must continue renting the property for at least 3 years after offsetting the deficit against global income. If you sell or stop renting before this deadline, the tax authorities will recalculate your tax as if the deficit had never been offset.

The classic strategy is to buy an older property requiring significant renovation work. Deductible works (maintenance, repair, improvement) generate a massive rental deficit that significantly reduces your overall tax for one or two years, then subsequent years benefit from the surplus carryforward.

The IRR (or TRI in French, Taux de Rendement Interne) is the discount rate that makes the net present value (NPV) of all cash flows equal to zero. In simple terms, it is the annualized real return on your investment taking into account all flows: initial equity, annual cash flows (positive or negative), and resale proceeds.

The IRR is superior to simple rental yield because it incorporates the time dimension of money. A euro received today is worth more than a euro received in 10 years. The IRR accounts for this effect, as well as credit leverage, capital gains at resale (net of taxation), and the evolution of rents and charges over time.

To compare investments of different natures (real estate vs stocks vs bonds), the IRR is the most relevant indicator because it reduces all flows to a comparable annual rate. An 8% IRR in real estate can be directly compared to the historical stock market return (approximately 7-8% per year on a long-term average).

However, be careful: the IRR is sensitive to assumptions. A 1% change in annual property appreciation or vacancy rate can significantly alter the result. This is why it is important to simulate several scenarios (optimistic, median, pessimistic) to get a realistic view of expected performance.

The leverage effect is the fundamental principle that makes real estate investment so powerful: by borrowing a large portion of the purchase price, you invest limited capital (your equity) but benefit from the return on the entire property. If the overall investment return exceeds the cost of credit, your return on equity is amplified.

The mechanism is simple: if a property costs EUR 200,000 and generates a 5% net return, the annual gain is EUR 10,000. If you buy cash, your return is 5% (10,000 / 200,000). But if you only invest EUR 20,000 as equity and borrow EUR 180,000 at 3.5%, the annual credit cost is approximately EUR 6,300. Your net gain is EUR 3,700, i.e. an 18.5% return on your EUR 20,000 invested.

The leverage effect also works on capital gains. If the property appreciates 2% per year, the annual gain is EUR 4,000. Relative to your EUR 20,000 equity, this represents an additional 20% return. In total, between rental income and appreciation, your return on equity can exceed 30% per year.

Beware, leverage is a double-edged sword. If the property return is lower than the credit cost (e.g. 2% return and 4% loan rate), leverage amplifies losses. Similarly, if the property value decreases, the loss as a percentage of your equity is amplified. This is why it is crucial to ensure that the expected return significantly exceeds the cost of credit.

Practical tips to optimize leverage: negotiate the best possible loan rate, maximize the loan-to-value ratio (ideally 100% + notary fees if your profile allows), use the tax deductibility of loan interest to reduce tax burden, and extend the loan duration to lower monthly payments and improve cash flow.