SQUARRELShares, securities, substantial shareholdings or cryptocurrencies: when is a capital gain taxable in Luxembourg and how is it calculated?
Selling shares, securities or other financial assets at a gain does not automatically trigger taxation in Luxembourg.
For an individual acting within the management of their private wealth, the tax treatment mainly depends on the nature of the asset, the holding period and, in the case of shareholdings in companies, the size of the interest held.
An important distinction must first be made: a capital gain realised on the sale of shares is not, as such, “investment income” within the meaning of Articles 97 and 98 of the Luxembourg Income Tax Law (*Loi concernant l'impôt sur le revenu*, LIR).
Dividends and interest fall within the category of investment income. A capital gain realised within an individual's private wealth, where taxable, falls within the category of miscellaneous net income governed by Articles 99 et seq. LIR.
This article concerns individuals and assets forming part of their private wealth. Different rules may apply where securities belong to a business or professional activity, or where the level of trading activity goes beyond the mere management of private wealth.
The key rule: a six-month holding period
For movable assets forming part of private wealth, Article 99bis LIR draws an initial distinction according to the holding period.
Where the period between acquisition and disposal of the asset does not exceed six months, the capital gain in principle constitutes a taxable speculative gain.
This rule may apply in particular to:
- shares;
- bonds and other securities;
- subscription rights;
- certain other financial assets;
- currencies in certain transactions;
- cryptocurrencies;
- and, more generally, other tangible or intangible movable assets.
The six-month period is therefore a maximum period: a disposal occurring exactly six months after acquisition may still fall within Article 99bis LIR.
Conversely, where the asset has been held for more than six months, a capital gain on movable private assets is in principle exempt.
There is, however, one major exception: substantial shareholdings in companies.
Six months or less: the gain is taxable regardless of the size of the shareholding
Where shares are sold within six months of their acquisition, the percentage interest held in the company is irrelevant.
A 1%, 5% or 30% shareholding is in principle subject to the same speculative-gain regime where it is disposed of within that period.
The taxable gain broadly corresponds to the difference between the disposal proceeds and the acquisition cost or cost basis, taking into account expenses deductible under the applicable rules.
The gain is then subject to the ordinary progressive income tax rates, with the statutory marginal rate currently reaching 42%, before the Employment Fund surcharge.
The 1.4% long-term care insurance contribution may also apply to miscellaneous net income where the taxpayer falls within the scope of Luxembourg long-term care insurance.
The EUR 500 threshold is not an allowance
Article 99bis LIR provides for a specific rule where the total speculative gains realised during the calendar year are small.
Speculative gains are not taxable where their total amount is less than EUR 500.
This is not a EUR 500 allowance.
Accordingly:
- total speculative gains of EUR 450 are not taxable;
- once the statutory threshold is reached or exceeded, it is not merely the portion exceeding EUR 500 that becomes taxable.
This rule applies to speculative gains falling within Article 99bis LIR.
It should not be confused with the EUR 50,000 allowance that may apply, subject to conditions, to long-term capital gains falling in particular within Article 100 LIR.
More than six months: the size of the shareholding becomes decisive
Where a shareholding has been held for more than six months, it is necessary to determine whether or not it constitutes a substantial shareholding within the meaning of Article 100 LIR.
Non-substantial shareholding
Where the shareholding is not substantial and the securities have been held for more than six months, a capital gain realised within private wealth is in principle exempt from Luxembourg income tax.
This is the typical case of a private investor holding a small interest in a listed company.
Substantial shareholding
Where the shareholding is substantial, the capital gain remains taxable even after a holding period exceeding six months.
It is, however, subject to a tax regime different from the speculative-gain regime.
When is a shareholding considered “substantial”?
The rule is more complex than simply checking the percentage held on the date of sale.
A shareholding is substantial where the seller, alone or together with their spouse or partner and minor children, directly or indirectly held more than 10% of the capital or, in the absence of share capital, of the entity's equity.
The threshold is therefore strictly greater than 10%.
Importantly, it is sufficient for this threshold to have been exceeded at any time during the five years preceding the disposal.
Reducing the shareholding before the sale does not therefore necessarily remove the substantial-shareholding classification.
Example
A taxpayer owns 15% of a company.
They sell part of their shares and retain only 8%.
If they sell the remaining shares two years later, the fact that they hold only 8% at the time of the second disposal does not in itself exclude Article 100 LIR: they held more than 10% during the five-year period preceding the sale.
Holdings of the spouse and minor children are taken into account
For the purpose of determining whether the 10% threshold is exceeded, Article 100 LIR does not look solely at the shares personally owned by the seller.
The following holdings are also taken into account:
- those of the taxpayer's spouse;
- those of the taxpayer's partner;
- those of the taxpayer's minor children.
A shareholding may therefore qualify as substantial even where the taxpayer personally owns less than 10%.
The family ownership structure should consequently be reviewed before any significant disposal.
Indirect shareholdings may also be taken into account
Article 100 LIR covers shareholdings held directly or indirectly.
Luxembourg law provides, in particular, that a shareholding held through a collective entity in which the taxpayer holds the majority of voting rights may constitute an indirect holding for the purpose of the threshold.
Determining whether a substantial shareholding exists may therefore require an analysis of the full ownership chain.
Securities held as part of the taxpayer's business or professional assets may also be relevant when determining whether the 10% threshold has been exceeded, even where the capital gain under review relates to securities forming part of private wealth.
A substantial shareholding held for more than six months benefits from the half global rate
A capital gain falling within Article 100 LIR constitutes extraordinary income.
It is taxed at the half global rate under Articles 131 and 132 LIR.
The half global rate should not be confused with a fixed flat tax rate.
It corresponds to half of the taxpayer's global tax rate determined on the basis of their adjusted taxable income.
Under the tax scale currently in force, it cannot theoretically exceed 21% before the Employment Fund surcharge.
The effective tax rate therefore depends on the taxpayer's overall tax position.
The acquisition cost may be revalued
This is an element frequently omitted from simplified explanations of Luxembourg taxation of capital gains on securities.
For income falling in particular within Article 100 LIR, Article 102(6) LIR provides for a revaluation of the acquisition cost through a coefficient determined by reference to the year in which the acquisition expenditure was incurred.
This revaluation can materially reduce the taxable capital gain where the securities have been held for a long period.
For example, the coefficient currently applicable to expenditure incurred in 2018 is 1.18.
A substantial shareholding acquired in 2018 for EUR 100,000 may therefore, subject to the other applicable rules, have a revalued acquisition cost of EUR 118,000 for the purpose of calculating a gain falling within Article 100 LIR.
This revaluation does not apply to speculative gains under Article 99bis LIR.
A EUR 50,000 allowance may apply
The aggregate income falling within Articles 99ter to 101 LIR benefits from an allowance of EUR 50,000.
Under the rules currently applicable, this allowance is increased to EUR 100,000 for spouses taxed jointly.
This benefit must, however, be understood correctly.
It is not an annual EUR 50,000 allowance applying solely to shares.
The allowance:
- applies to all income falling within Articles 99ter to 101 LIR;
- may therefore be used for certain long-term real estate gains as well as for gains on substantial shareholdings;
- is reduced by allowances already granted during the previous ten years;
- cannot create a tax loss.
Before calculating tax on the disposal of a substantial shareholding, the taxpayer's capital-gain and allowance history over the preceding ten years should therefore be reviewed.
Example: substantial shareholding held for several years
A single taxpayer acquired a 15% shareholding in a company in 2018 for EUR 100,000.
They sell it in 2026 for EUR 200,000 and incur EUR 2,000 of disposal costs.
In this simplified example:
- disposal proceeds: EUR 200,000;
- disposal costs: EUR 2,000;
- historical acquisition cost: EUR 100,000;
- acquisition cost revalued using the 1.18 coefficient: EUR 118,000;
- capital gain before allowance: EUR 80,000.
If the taxpayer has not used any allowance under Article 130 during the preceding ten years, the EUR 50,000 allowance reduces the amount subject to the half global rate to EUR 30,000.
The example does not take into account the Employment Fund surcharge or, where applicable, the long-term care insurance contribution.
Its main purpose is to illustrate why the simple formula “sale price minus purchase price” may be insufficient to determine the actual taxable gain.
What about capital losses?
Capital losses cannot be freely offset against the taxpayer's other categories of income.
A loss on shares cannot therefore, for example, be deducted without restriction against employment income or rental income.
Article 102(13) and (14) LIR governs the offsetting of losses against positive income falling within Articles 99bis to 101 LIR.
Any excess loss does not constitute a freely available tax loss that can automatically be carried forward to subsequent years.
In practice, all disposal transactions realised during the same tax year should therefore be reviewed together.
Shares acquired at different dates: which method applies?
A frequent difficulty arises where an investor holds identical securities acquired at different dates and prices.
This matters because the holding period may determine whether a capital gain is taxable or exempt.
Where securities can be reliably identified individually, for example because identical shares are held in separate portfolios and adequate traceability exists, the relevant gain may be determined by reference to the specific securities sold and their respective holding period.
Where sufficiently precise individual tracing is not possible, the Luxembourg tax administration applies in practice a weighted average cost method.
The FIFO — “first in, first out” — method should therefore not be applied automatically.
This issue can be particularly relevant for portfolios involving repeated acquisitions of the same security.
Gift or inheritance: the latent capital gain does not simply disappear
A transfer free of charge does not, in principle, itself constitute a taxable realisation of a capital gain.
However, the recipient does not necessarily obtain a new tax basis equal to the market value of the asset at the date of the gift or inheritance.
Article 102 LIR instead follows a continuity principle.
Where an asset has been acquired free of charge, the acquisition cost to be used upon a subsequent disposal is in principle the amount paid by the previous holder who most recently acquired the asset for consideration.
The acquisition date is likewise carried over from that previous holder.
Example
A parent acquires shares in 2010 for EUR 20,000 and gives them to their child in 2025, when their market value is EUR 100,000.
If the child subsequently sells the shares, the EUR 100,000 value recorded at the date of the gift does not automatically become the child's tax acquisition cost.
As a rule, it is necessary to trace back to the earlier acquisition for consideration, subject to any specific rules that may apply.
A transfer free of charge may also carry forward certain consequences relating to the classification as a substantial shareholding where the conditions of Article 100 LIR are met.
Moving to Luxembourg with a substantial shareholding
A particularly important rule applies to individuals who become Luxembourg tax residents while already holding a substantial shareholding.
For securities falling within Article 100 LIR, Article 102(4a) provides in principle that their Luxembourg tax acquisition value is equal to their estimated realisation value on the date on which the non-resident individual becomes a Luxembourg resident.
In practice, this operates as a tax *step-up*.
Example
An individual acquires a shareholding abroad for EUR 500,000.
On the date they become Luxembourg tax resident, the shareholding is worth EUR 900,000.
Subject to the statutory conditions, EUR 900,000 may become the relevant Luxembourg tax basis for a subsequent disposal falling within Article 100 LIR.
The capital gain accrued before the individual's arrival in Luxembourg is therefore not included in the Luxembourg tax base in the same manner.
An exception applies, however, where the taxpayer had previously been a Luxembourg resident for more than fifteen years and had been non-resident for less than five years.
This rule should therefore be reviewed before any migration to Luxembourg involving a significant shareholding.
An exchange of securities may also constitute a taxable realisation
The general principle under Article 102 LIR is that an exchange constitutes a disposal for consideration of the asset transferred, followed by an acquisition of the asset received.
An exchange of shares for other shares may therefore, in principle, trigger a capital gain.
There are, however, specific regimes under which certain share-for-share exchanges may be tax-neutral where their statutory conditions are met.
Article 102(10) LIR notably refers to certain transactions falling within Article 22bis LIR.
In such situations, the acquisition cost and acquisition date may be carried over to the securities received.
A restructuring or share exchange should therefore never be assumed to be tax-neutral merely because no cash consideration is received.
SICAVs, investment funds and switches between compartments
Specific rules should be considered for certain collective investment vehicles.
In Circular L.I.R. No. 100/1, the Luxembourg tax administration notably takes the position that a switch from one compartment to another within the relevant investment vehicle economically involves a disposal of the units in the first compartment followed by the acquisition of units in the second.
A simple switch between compartments may therefore constitute a taxable realisation, even where the money remains invested.
The subsequent tax treatment depends on the legal nature of the investment vehicle, the size of the holding and the relevant holding period.
Cryptocurrencies: the same six-month period, but specific rules apply
According to Luxembourg administrative guidance, cryptocurrencies constitute intangible assets rather than currencies having legal tender status.
Where the activity remains within the management of private wealth, Article 99bis LIR may apply.
A realisation is not limited to converting cryptocurrency into euros.
The following may constitute disposals:
- selling cryptocurrency for euros;
- exchanging one cryptocurrency for another;
- using cryptocurrency to purchase goods;
- using cryptocurrency to pay for services.
Each transaction may therefore crystallise a capital gain or loss.
Where the holding period does not exceed six months, the gain may constitute a taxable speculative gain.
Where the holding period exceeds six months, a gain realised within the management of private wealth will generally no longer fall within the speculative-gain regime, subject to potential classification in another income category.
Documentation is essential
The taxpayer should be able to substantiate:
- the acquisition date;
- the acquisition cost;
- the date of disposal or exchange;
- the euro value at the time of each transaction;
- the related costs.
Where the individual units sold cannot be identified, the Luxembourg tax administration requires the use of the weighted average acquisition cost method.
Its guidance expressly excludes the FIFO and LIFO methods for virtual currencies.
When can trading become a commercial activity?
The favourable private-wealth regime does not apply where an activity meets the conditions for a commercial activity within the meaning of Article 14 LIR.
The boundary must be assessed on a case-by-case basis.
A high frequency of transactions is not necessarily sufficient on its own, but several factors may be relevant, including:
- the organised and permanent nature of the activity;
- significant use of borrowed funds;
- frequent portfolio turnover;
- specific material resources devoted to the activity;
- acting on behalf of third parties;
- and, more generally, circumstances showing that the activity exceeds the mere management of private wealth.
Where the activity is classified as commercial, Articles 99bis and 100 no longer constitute the primary tax regime: the gains instead fall within commercial profits.
Such a classification can materially alter the treatment of gains, losses and expenses.
Short selling: a specific rule
Article 99bis LIR also covers transactions in which the disposal occurs before the acquisition.
A short sale may therefore constitute a specific form of taxable speculative gain.
The regime does not simply depend on how long an asset was held, since by definition the sale precedes the acquisition.
Bare ownership and usufruct
Splitting ownership rights does not, by itself, avoid capital gains taxation.
Article 108bis LIR provides that a capital gain realised upon the disposal for consideration of bare ownership or usufruct over an asset is taxable where the gain arising from the disposal of the underlying asset itself would have been taxable.
The same principle applies to similar rights.
A separate disposal of the usufruct and bare ownership of shares must therefore be examined by reference to the tax treatment that would have applied to the underlying securities.
Leaving Luxembourg: substantial shareholdings require particular attention
The Luxembourg domestic rules applicable to non-residents are more limited, but they should not be overlooked.
Luxembourg domestic law may notably continue to cover certain capital gains on substantial shareholdings in Luxembourg entities.
For a substantial shareholding held for more than six months, Article 156 LIR notably covers a former Luxembourg resident who:
- was a Luxembourg tax resident for more than fifteen years; and
- became non-resident less than five years before the relevant gain was realised.
This domestic rule must then be considered together with the applicable double tax treaty, which may restrict or eliminate Luxembourg's taxing rights.
An individual planning to leave Luxembourg while holding a substantial shareholding with a significant latent gain should therefore review the tax position before any disposal.
How should a taxable capital gain on securities be reported?
Taxable private capital gains are reported in the miscellaneous net income section of the Luxembourg income tax return.
For shares and substantial shareholdings, it is advisable to retain documentation covering at least:
- the identity of the company;
- the number and percentage of securities held;
- each acquisition date;
- the acquisition cost;
- related expenses;
- the disposal date;
- the disposal proceeds;
- the history of the shareholding during the preceding five years;
- the holdings of the spouse, partner and minor children where the 10% threshold must be tested;
- any Article 130 allowances used during the preceding ten years.
The Luxembourg tax administration may request supporting evidence for these elements.
A taxable capital gain may also affect whether the taxpayer is required to file an income tax return.
What will change under the tax reform planned for 2028?
The legislation implementing the single tax class, adopted by the Luxembourg Parliament on 28 October 2026, also provides for an amendment to Article 130 LIR.
The basic allowance remains EUR 50,000.
However, according to the adopted text, the increase to EUR 100,000 for spouses will continue during the transitional period ending in 2052 for taxpayers who remain jointly assessed under the transitional regime.
This point may become important for couples realising significant capital gains after 2028.
It must nevertheless be distinguished from the rules currently in force: at the time this article was prepared, the adopted text had yet to complete the legislative process and be formally published.
The four questions to ask before selling securities
Before concluding that a capital gain on shares is taxable or exempt in Luxembourg, at least four questions should be addressed.
1. Do the securities genuinely belong to the taxpayer's private wealth?
If the activity constitutes a commercial enterprise or the securities form part of professional assets, a different regime applies.
2. Have the securities been held for more than six months?
Six months or less: Article 99bis LIR and the speculative-gain regime.
More than six months: continue the analysis.
3. Has a substantial shareholding existed at any time during the preceding five years?
Direct and indirect holdings must be considered together with, under Article 100 LIR, the holdings of the spouse, partner and minor children.
4. What is the actual taxable capital gain?
The analysis should take into account the acquisition cost, expenses, any applicable revaluation, earlier transfers, a possible tax *step-up* upon moving to Luxembourg, deductible losses and any available allowance.
Conclusion
Luxembourg taxation of capital gains on securities is often reduced to two figures: six months and 10%.
Those two criteria are fundamental, but they are not sufficient.
The 10% threshold must be tested over a five-year period and may include family or indirect holdings. A gift or inheritance does not necessarily reset the tax history of the securities. A substantial shareholding may benefit from a revaluation of its acquisition cost and from a ten-year allowance mechanism. An exchange of securities or cryptocurrencies may constitute a taxable realisation even where no euros are received. Finally, sufficiently organised trading activity may fall entirely outside the private-wealth regime.
The key issue is therefore not merely to calculate the difference between the sale price and the purchase price, but to identify the correct tax regime before the disposal takes place.
This content is general. How it applies depends on your situation and the rules in force.
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