Buy-to-Let Investment in Paris: The 10 Mistakes Beginners Make

In fifteen years of activity and more than 1,200 mandates, Home Select has seen hundreds of first-time investors enter the Parisian market. The mistakes they make are remarkably predictable, and remarkably costly. What is striking is not their ignorance (our clients are often executives, professionals, savvy entrepreneurs), but the strength of the cognitive biases that push them towards irrational decisions when facing a property.

1. What is the difference between gross yield and net yield?

Gross yield divides the annual rent by the purchase price alone, while net yield deducts every fee, charge and tax: in Paris, a studio advertised at a 5.1% gross yield falls to 3.46% net, and to 2.1% once tax is paid. This is the foundational error. An investor spots a 20 m² studio in the 18th arrondissement at 184,000 euros, rented at 780 euros/month. They calculate: 9,360 euros / 184,000 euros = 5.1%. They sign.

What they did not calculate: notaire fees (13,800 euros), non-recoverable co-ownership charges (750 euros/year), property tax (280 euros), landlord insurance (130 euros), letting management (749 euros/year), vacancy (260 euros/year), maintenance (350 euros/year). On a total investment of 197,800 euros, the net income is 6,841 euros. Net yield: 3.46%. After tax at the 30% marginal rate under unfurnished rental, the net-net yield drops to 2.1%. The gap from the initial 5.1% is 3 points: the real yield is 40% of the imagined one.

The solution: always calculate the net-net before buying. Use the total invested amount (price + fees + works) as the base, and deduct all charges and projected taxation.

2. Which floor should you buy on for a buy-to-let in Paris?

A buy-to-let investment should be on the 3rd floor or above: this is a rule we apply without exception at Home Select. The ground floor is a classic trap: a ground-floor studio sells for 10 to 15% less, which is tempting, but the rent is 15 to 20% lower (noise, darkness, overlooking, insecurity) and vacancy doubles. Over 15 years, the cumulative rental loss systematically exceeds the saving at purchase.

The first floor is tolerable in Haussmann buildings (3.20 m ceiling height, continuous balcony) but remains penalised by noise.

3. How does rent control work in Paris?

Rent control has been in force in Paris since 2019: each dwelling has a reference rent, a maximum reference rent (+20%) and a minimum reference rent (-30%), calculated by the OLAP based on the neighbourhood, type, number of rooms, construction date and whether furnished or unfurnished. A landlord cannot exceed the maximum reference rent.

The mistake: buying based on the rent charged by the seller without checking compliance. If the rent exceeds the cap, the tenant can challenge it and obtain a reimbursement of the excess over three years. Fine: 5,000 euros (individual), 15,000 euros (corporate entity).

Solution: check the reference rent on the DRIHL website before any calculation. Base the simulation on the maximum reference rent, not the rent stated by the seller.

4. How should you budget works in an older Paris apartment?

Multiply the first quote by 1.3: that is our empirical rule, forged by experience. Older Parisian buildings systematically spring surprises: lead pipes, outdated electrical panel, non-existent insulation, asbestos in tile adhesive.

An investor buys a studio “to refresh” in the 10th at 180,000 euros with a quote of 15,000 euros. The project finishes at 22,000 euros (cracked waste pipe, panel to replace). The extra 7,000 euros erodes the yield by 0.3 points for the entire holding period.

Solution: works budget with a 30% margin. Have the property inspected by a professional before making an offer. Review the general meeting minutes for planned co-ownership works.

5. Should you invest in the arrondissement where you live?

No: the arrondissement should be chosen for the target tenant, not for your own taste, and the gross yield gap reaches 1.4 points between a studio in the 16th and the same studio in the 13th, or 2,400 euros a year. A 45-year-old executive buys a studio in the 16th because they live there and like the neighbourhood. The 20 m² studio at 12,400 euros/m² costs 248,000 euros. Regulated rent: 800 euros/month. Gross yield: 3.87%. In the 13th, the same studio costs 172,000 euros and rents at 750 euros/month: gross yield of 5.23%. The gap: 1.4 points, or 2,400 euros/year.

The target tenant for a studio is a student, a young professional, an employee on a temporary assignment, not an executive from the 16th. The 10th, 11th, 13th and 18th arrondissements serve this demand far better than the 16th or the 7th. Investing with your own perspective rather than the target tenant’s is a classic bias that costs dearly.

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6. What should you check in the co-ownership before investing?

Before making any offer, read the last three general meeting minutes and the maintenance logbook: the condition of the co-ownership is the invisible factor that makes or breaks an investment. A facade renovation shared among 20 lots: 7,500 euros per co-owner. A roof replacement: 10,000 to 15,000 euros per lot. A lift: 5,000 to 8,000 euros.

The mistake: buying without reviewing the last three general meeting minutes and the maintenance logbook. Major works are rarely surprises: they are discussed and costed years before execution. The investor who reads the minutes knows what to expect. The one who does not discovers the bill after signing.

Solution: require the minutes from the last three general meetings and the multi-year works plan before making any offer. Factor foreseeable exceptional charges into the profitability calculation.

7. How much does an Airbnb really earn in Paris?

A studio in the Marais let at 120 euros a night on Airbnb actually earns 380 to 520 euros a month, not the theoretical 3,600 euros a month. The 90-night annual cap, which brings the gross down to 10,800 euros a year, plus cleaning, commission, tourist tax and off-season vacancy absorb the difference, so the income is often less than a standard rental.

Building a financing plan on hypothetical Airbnb income means building on a shifting regulatory framework. The trend is clearly towards tighter regulation. Structure your investment on the basis of standard letting: if Airbnb brings a bonus for a few weeks a year, it is a bonus, not a foundation.

8. How is a buy-to-let investment taxed in Paris?

Under unfurnished rental, an investor in the 41% marginal tax bracket gives up 58.2% of their net rental income to tax and social contributions: on a net income of 8,000 euros, the tax reaches 4,656 euros, more than half. The regime chosen therefore weighs as much as the property itself.

The same investment under LMNP at the real expenses regime can neutralise this taxation. The difference exceeds 4,000 euros/year. Capitalised over 20 years, that is more than 80,000 euros.

Taxation is a structural parameter that must be defined before the purchase, not a technical detail to sort out afterwards.

9. What size should an investment studio in Paris be?

The optimal format for an investment studio in Paris is 18 to 25 m2: this is the sweet spot that maximises rent per square metre while maintaining reasonable turnover and good resale liquidity. Below 15 m², the problem becomes structural.

Turnover is significantly higher (10 months on average in a 12 m² versus 24 months in a 20 m²), vacancy is more frequent, and resale is more difficult. Banks rarely finance below 14 m².

10. How do you protect the resale of a buy-to-let?

Resale must remain possible under good conditions at any time, which means ruling out from the start the factors that penalise it: poor energy rating, low floor, significant overlooking, indebted co-ownership, arrondissement losing appeal. A buy-to-let investment is sized for 20 years, but circumstances change: relocation, divorce, need for liquidity, new opportunity.

Penalising factors: poor energy rating (increasing discount), low floor, significant overlooking, indebted co-ownership, arrondissement losing appeal. The investor who buys on the 6th floor of a well-maintained building with a C energy rating in a dynamic arrondissement keeps all options open. The one who buys on the ground floor of a building with a pending facade renovation and an F energy rating is trapped.

How does a property hunter help an investor?

A property hunter who has completed hundreds of investment transactions identifies these ten mistakes before the investor falls into them. These mistakes are not inevitable: they result from cognitive biases and a lack of professional guidance.

Our property hunters systematically check co-ownership minutes, the actual energy rating, the regulated reference rent, the condition of networks, the floor and the orientation before recommending a property. Our average negotiation margin of 6% on the purchase price fully covers our fees: the investor benefits from our expertise at no real additional cost.

Across 1,200+ mandates since 2011 and a 96% satisfaction rate, the pattern is clear: supported investors buy better, let better and sell better. It is not a question of intelligence: it is a question of accumulated experience and access to information that only a Parisian market professional can provide.

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