You work in Luxembourg, or you are thinking of investing there, and you are hesitating between renting and buying. The answer depends first on your project: living in the property or letting it. This article, written in October 2025 with the interest rates and reliefs of that period, sets the two calculations side by side. The figures are orders of magnitude intended to show the reasoning; they need updating at the time of your own project.
Main home: two tax reliefs that change the equation
Luxembourg grants the buyer of a main home two advantages that have no equivalent in this form in France.
Deductibility of mortgage interest. Interest on the loan financing the home you occupy is deductible from taxable income, within annual ceilings that depend on household composition and how long you have occupied the property. On a loan of €400,000 at 3.5 %, first-year interest comes close to €14,000. For a taxpayer at a marginal rate of 40 %, the theoretical saving would be €5,600 before the ceilings apply; in practice the ceilings bring the advantage down to a few thousand euros a year, which remains significant.
The tax credit on registration duties, known as the “Bëllegen Akt”. Registration and transcription duties amount to 7 % of the price. For a main home, each buyer receives a tax credit set against those duties, raised to €40,000 per person since 1 January 2024 and kept at that level, so €80,000 for a couple, on condition that the home is occupied for at least two years. This is not a deduction spread over time: the saving is realised at the deed. For a couple buying at €750,000, theoretical duties of €52,500 are fully absorbed; only the fees of the notaire (the civil-law notary who executes the deed) and the mortgage registration costs remain, around €10,000, roughly 1.4 % of the price instead of 7 %.
To these two measures are added, subject to conditions, a reduced VAT rate on the construction or off-plan purchase of a home intended as a main residence, and grants for energy renovation. The conditions and amounts are published by the Luxembourg administration and change regularly.
The ten-year calculation
- Renting at €2,500 a month for ten years means €300,000 paid out, with no asset built up.
- Buying with a monthly instalment of €2,800 means €336,000 paid out, but a growing share of that sum is repaid capital, and the cumulative tax advantage (deductible interest and tax credit at the deed) lies, depending on the assumptions, between €60,000 and €100,000.
In this configuration, buying becomes more favourable than renting from the first few years, provided the property does not lose value. That is the assumption to discuss: the fundamentals of the Luxembourg market (scarce land, population growth) are solid, but price movements since 2022 have shown that prices do not rise continuously.
What if the property is rated F or G? No rule prevents you from occupying your own home. You can schedule the insulation works at your own pace. The question is different for a property intended for letting, where energy performance weighs on rental appeal and on resale value.
Buy-to-let: look at cash flow, not gross yield
Take a flat bought for €500,000 and let at €2,000 a month. The gross yield is 4.8 % (€24,000 of rent against the price). That figure deserves to be broken down.
With a loan of €400,000 at 3.5 % over 25 years, the monthly outgoings are as follows:
- loan instalment (capital and interest): about €2,000;
- non-recoverable service charges: €300;
- insurance: €125;
- tax on rental income: €75.
That is €2,500 of outgoings against €2,000 of rent received: the investor tops up €500 a month, €6,000 a year. Against the price, the net cash yield is −1.2 %.
This calculation assumes continuous letting and a trouble-free property. Reality includes contingencies that have to be budgeted:
- a void of one to two months between tenants, so €2,000 to €4,000 of rent not received every three to five years;
- unexpected works: boiler (€3,000 to €5,000), share of a roof (€10,000 to €15,000 in an apartment building), refurbishment after a departure (€1,000 to €3,000);
- rent arrears, rare but costly (several months of rent and legal costs).
The exit question
With negative cash flow, the profitability of the operation rests on the capital gain at resale. Over fifteen years, the total speaks for itself:
- basic cash top-up: €6,000 × 15 = €90,000;
- realistic contingencies: three void periods (€6,000), boiler (€4,000), kitchen and bathroom renovation (€10,000), sundry repairs (€5,000), about €25,000 in all;
- total: about €115,000 committed over fifteen years.
If the resale does not produce at least €115,000 of net capital gain, the result is negative. Capital gains tax must be built in: Luxembourg law distinguishes a quick sale, taxed as a speculative profit, from a sale after long holding, which benefits from a revaluation of the purchase price and an allowance. That tax reduces the available gain accordingly.
Where the equation can become favourable again
Shared letting. A three-bedroom flat let at €2,000 to a family may produce €2,400 as a house share (3 × €800). The monthly shortfall of €500 then becomes a surplus of €100. One point of law frames this calculation: the amended Luxembourg law of 21 September 2006 on residential leases caps the annual rent at 5 % of the revalued invested capital. The lease reform that came into force on 1 August 2024 did not change that cap, but a bill proposes to lower it to 3.5 % for new leases; the rate applicable at the time of your project should therefore be checked before any projection. The same reform regulated shared letting and split agency fees between landlord and tenant.
Furnished short or medium-term lets. An unfurnished studio at €1,200 a month may let furnished at €1,500, to expatriates or employees on assignment. The extra €300 is sometimes enough to balance the cash flow, at the price of more active management.
Districts in transition. Gare, Hollerich, Cloche d’Or: buying ahead of a possible revaluation. The logic of negative cash flow in the early years remains the same; you must be able to carry it.
The holding structure. Buying directly or through a company does not have the same tax consequences, for the deduction of expenses and depreciation as for inheritance. That choice belongs to specialist tax advice and properly kept accounts.
What the valuer does in this context
Before committing, the most useful step is to test the asking price against market value, defined by EVS 1 of the European Valuation Standards 2025 as the estimated amount for which the property would exchange, on the valuation date, between a willing buyer and a willing seller acting knowledgeably and without compulsion. As a member of the LPVI, the Luxembourg association of property valuation experts (lpvi.lu), and certified REV and TRV by TEGOVA, I apply the same standards on both sides of the border. The valuation does not tell you whether the deal is right for you; it tells you what the property is worth, which is the starting point of any profitability calculation.
In summary
For a main home, Luxembourg’s reliefs make buying more favourable than renting fairly quickly, subject to price movements. For a conventional buy-to-let, a gross yield of 4.8 % conceals a negative cash flow of around €6,000 a year, a commitment of fifteen to twenty years and the need for a safety reserve of €30,000 to €50,000. Some configurations (shared letting, furnished lets, districts in transition) can restore the balance, but each calls for a case-by-case calculation.
Further reading
The Market value page presents the method I apply to residential property. On the same theme, you can read Historically low mortgage rates: how to make the most of them and Tax-incentive property: watch the real value of what you buy.
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