Capital gains when you sell a Luxembourg property

Selling a property in Luxembourg produces one of two tax outcomes and the difference between them is large. A principal residence is in principle exempt. Anything else is taxed, and how heavily depends almost entirely on whether you held it for more than two years. Beyond that sits a revaluation mechanism that adjusts the purchase price for inflation and an allowance that removes a substantial slice of the gain, both of which are routinely overlooked by sellers doing rough arithmetic on the back of an envelope.

The principal residence exemption

The gain realised on the sale of a principal residence is in principle exempt from tax. For a dwelling to qualify, it is sufficient to meet one of the following conditions:

• Occupation immediately after acquisition or completion; or
• Occupation for at least the five years preceding the sale; or
• A sale for imperative family or professional reasons.

Where one of these is met, the qualification as a principal residence is maintained if the sale takes place no later than 31 December of the year following the year of the move. That deadline is the one people miss: a household that moves out, lets the property for two years and then sells has left the exemption behind.

The exemption extends to the normal dependencies of the property, including the land on which the building stands.

Everything else: two regimes

Held for less than two years: speculation

The gain is treated as a speculative profit and is added in full to your taxable income for the year, taxed at the progressive scale with the employment fund surcharge on top. At the upper end the effective rate approaches the mid-forties in percentage terms.

The practical rule is simple: do not sell an investment property inside two years unless you have to.

Held for two years or more: disposal

The gain is taxed at a quarter of the global rate, which for most sellers produces an effective rate in the region of ten to eleven per cent. That is the regime under which almost all Luxembourg property investment is eventually taxed, and it is a mild one by European standards.

The two mechanisms that reduce the gain

Revaluation of the purchase price

Under the disposal regime the acquisition price and the acquisition costs are revalued using a coefficient published annually by STATEC. This is not a technicality; it is frequently the largest single adjustment.

The coefficients rise the further back the purchase, and by way of illustration the 2026 coefficients run from around 1.48 for a purchase in the current year up to well over two for purchases in the early 2010s. A property bought for €400,000 in 2015 has a revalued acquisition price in the region of €828,000, which removes a great deal of what looked like a gain.

The decennial allowance

An allowance of €50,000 per person, or €100,000 for a couple taxed collectively, is deducted from the taxable gain. It recharges every ten years, which means it can be planned for: spacing disposals a decade apart preserves it each time.

What counts in the calculation

• The sale price, reduced by costs directly linked to the transaction such as agency commission and the seller's notarial costs.
• The acquisition price, increased by acquisition costs and by investment expenditure, then revalued.
• Improvement works count. Keep the invoices; without them the expenditure is difficult to establish.
• Loan interest does not reduce the gain. It is deducted elsewhere, against rental income or as a principal residence deduction, not here.

The single most valuable habit for any Luxembourg property owner is keeping every invoice for works in one file from the day of purchase. Ten years later it is worth real money and it cannot be reconstructed.

Non-residents, and the rollover that has gone

Non-resident sellers are taxed under the same rules as residents. There is no withholding at source, which means the obligation is on the seller to declare, and non-residents may under conditions request assimilation to resident status.

A temporary rollover mechanism allowed the deferral of tax where the proceeds were reinvested under strict conditions, for sales between 1 January 2024 and 30 June 2025. That window has closed, and anyone relying on advice from that period should check the current position rather than assume it persists.

Planning points that are legitimate and simple

• Mind the two-year line on anything that is not your home.
• Mind the 31 December deadline in the year following a move if you want to keep the principal residence exemption.
• Space disposals to preserve the decennial allowance where you hold more than one property.
• Keep the works invoices.
• Do not set the sale price to cover the tax. The market sets the price; the buyer does not pay your tax bill, and a property priced above the market simply does not sell.
• Take advice where the sum is significant. The revaluation coefficient, the allowance and the definition of investment expenditure are exactly the areas where a few hundred euros of professional time changes the outcome by a great deal more.

The records to keep from the day you buy

Almost every euro of relief in this article depends on documents that are easy to keep and impossible to reconstruct a decade later.

• The notarial deed of acquisition, with the price and the acquisition costs itemised.
• Every invoice for works, with the date, the contractor and a description of what was done.
• A note distinguishing improvement from maintenance, since the treatment differs and the distinction is far easier to make at the time.
• Evidence of occupation where the principal residence exemption may be in play: the declaration of arrival, utility contracts, the dates of any move.
• Agency and notarial invoices on the sale, which reduce the sale price in the calculation.
• Records of any earlier disposal, because of the ten-year cycle on the allowance.

One folder, opened on the day of the deed. Owners who keep it routinely pay less tax than owners with identical properties who did not, and the difference is entirely administrative.

Three questions we are asked

I lived in it, then let it for a year. Am I exempt?

Possibly, if the sale takes place no later than 31 December of the year following the move and one of the qualifying conditions was met. The timing is the decisive fact, so establish the dates before you decide when to sell.

How is the revaluation coefficient applied?

The acquisition price and costs are multiplied by the coefficient for the year of acquisition, published annually by STATEC. The notary or your adviser will apply it, and it is worth asking for the calculation rather than accepting a headline figure.

Does the gain affect my other tax?

The gain is declared in your income tax return and, under the speculation regime, is added to your other income at the progressive rate, which can push part of your income into a higher band. Under the disposal regime the quarter-rate treatment limits that effect considerably.

How we work on this

Sellers routinely price a property on what they need rather than on what the market will pay, and the tax position is often the reason. Establish the tax figure first, separately, and then let us price the property on its merits.

The final decision around how we work on this should be explainable in a few sentences.

For everything else: two regimes, note what you can see, what you can measure, what you need to ask and what would be expensive to change.

A useful editorial test for the two mechanisms that reduce the gain is to look at the consequence rather than the headline feature.