Property Finance

Rental yield in Luxembourg: why the headline number rarely survives contact

A yield calculated by dividing local market rent by purchase price is wrong in three specific ways here, and one of them is a statutory ceiling on what you are allowed to charge.

The rent is capped, and the cap is not a market rate

Luxembourg law limits residential rent: the annual rent may not exceed 5% of the capital invested in the dwelling, revalued. This is the constraint investors from other markets most often miss, because it means the achievable rent is a function of what was invested rather than of what similar properties are advertised at.

The 2024 reform preserved that rule and tightened its perimeter in two ways. It abolished the notion of the luxury dwelling, which had allowed higher-end properties to escape the cap entirely. And it clarified that where a dwelling is let to several tenants, whether under a single joint lease or under multiple individual leases, the sum of the rents is subject to the same annual ceiling, closing the route of letting room by room.

A furnished letting may carry a legitimate rent supplement for the furniture on top of the capped figure. Enforcement is not automatic: the route is the commune's commission des loyers, free to petition, whose opinion is not binding but is frequently followed, and since the reform the lease must expressly mention that right.

Rent growth is constrained too

Luxembourg rents are not indexed automatically. A revision must be notified by registered letter with a month's notice, and the reform replaced the previous annual-thirds mechanism with a biennial limit of 10%: at each adaptation the rent cannot rise by more than 10%.

For a yield model this changes the shape of the projection. Assuming a small annual uplift is wrong in both directions: no automatic increase, and a step capped at 10% no more often than every two years. Both ceilings apply together, so an increase can respect the 10% limit and still be unlawful because the resulting rent exceeds the 5%-of-capital figure.

The acquisition cost, which the denominator usually ignores

Duties are 7%, being 6% registration and 1% transcription, with regulated notary emoluments of roughly 1% to 1.5% plus VAT, disbursements and the mortgage deed. Crucially, the Bëllegen Akt is conditional on occupying the property personally as your principal residence, so an investor cannot claim it at all.

Total acquisition costs for an investor therefore sit materially above the roughly 8% to 13% range typical for an owner-occupier who does claim the credit. A yield calculated on the purchase price rather than on the total invested overstates the return from the first day, and it does so by several percentage points of capital.

Financing is tighter as well. Under CSSF Regulation 20-08 the general loan-to-value principle is 80%, and buy-to-let sits at that level rather than benefiting from the higher limits available on a principal residence. That means a 20% deposit on the price plus the full acquisition costs in cash, since those are normally excluded from the financing.

The costs that are not recoverable from a tenant

In a copropriété, ordinary charges, the compulsory fonds de travaux contribution and any special calls for funds fall on the owner in proportion to millièmes, whoever occupies the property. Since 1 August 2023 the works fund contribution has a legal floor per square metre of energy reference surface, graded by the building's thermal insulation class.

The monthly advance a tenant pays covers running costs. Major works voted by the assembly remain the owner's, and they are decided on a timetable other owners set.

Add the letting costs. Since 1 August 2024 agency commission on a residential letting is shared equally between landlord and tenant, so the owner's half is a recurring transaction cost at every turnover. Add vacancy between tenancies, maintenance inside the lot, and buildings-related insurance.

The tenancy rules that shape the cash flow

Three features of the 2024 reform affect an owner's position directly. The rental guarantee is capped at two months' rent excluding charges, calculated on the base rent rather than on rent plus charges. A written lease is mandatory on pain of nullity, with prescribed content. And the return of the guarantee follows a statutory procedure with deadlines and a penalty for delay: half within one month of the handover of keys where the exit inventory matches the entry one and rent is paid, the remainder within one month of the annual charges being approved or the statements received.

Withholding the whole deposit over a partial dispute is one of the most frequent and costly landlord errors in this market, and any deduction must rest on objectively verifiable evidence rather than on an owner's own estimate.

Building a yield figure that holds

Numerator: the rent actually permitted under the 5% rule for this property, less ordinary charges not recoverable, less the works fund contribution, less insurance and maintenance, less a vacancy allowance, less your half of the letting commission amortised over the expected tenancy length.

Denominator: the price plus the full acquisition costs with no Bëllegen Akt, plus any works required to let the property.

Then test it against a year in which the assembly votes a call for funds, because over a ten-year hold that is a normal event rather than a stress case.

Three questions we are asked

Does a poor energy class matter for an investment? On two fronts. It narrows the financing available, since F to H classifications typically trigger stricter analysis with works folded into the plan, and it raises the building's minimum works fund contribution, which is graded by insulation class.

Is furnished letting more profitable? The furniture supplement sits above the capped rent, which helps. Set against that, every inventoried item is something that can be disputed at the exit inspection, and turnover tends to be higher, which means more commission and more vacancy.

Is the rent cap actually applied? Not automatically, and a tenant must petition the commune's rent commission. Building a model on a rent the law does not permit is nonetheless a poor foundation, particularly since the lease must now expressly inform the tenant of that right.

The exit, which belongs in the model

An investment case built on annual yield alone ignores the largest single cost, which is transacting.

An investor pays duties of 7% with no Bëllegen Akt available, plus regulated emoluments with VAT, disbursements and the mortgage deed, and finances at a maximum 80% loan-to-value with the acquisition costs in cash on top. Selling brings its own costs. A property therefore has to appreciate by a substantial margin simply to return the capital invested, and that margin has to be earned before any yield is counted as profit.

Two consequences. Short holds are structurally unattractive here in a way that headline yields conceal. And the characteristics that make a property easy to sell later, a lift above the second floor, a second bedroom rather than one large one, included parking, a usable cave, proximity to a tram or bus stop, and an energy class that does not narrow the buyer pool, are part of the investment case rather than a separate question of taste.