Merger by absorption in Luxembourg: steps and timing

What is a merger by absorption in Luxembourg?

A merger by absorption in Luxembourg is the operation by which one or more companies transfer, as a result of and at the time of their dissolution without liquidation, their entire estate, assets and liabilities, to another pre-existing company, in exchange for shares issued by the latter and, where applicable, a strictly capped cash payment.

Luxembourg law knows two forms of merger, and confusing them wastes time at the drafting stage. A merger by absorption makes the absorbed company disappear into a company that already existed. A merger by incorporation of a new company is the one by which several companies transfer their entire estate to a company they incorporate, as a result of their dissolution without liquidation. In both cases, a cash payment not exceeding 10 % of the nominal value of the securities allocated or, failing a nominal value, of their accounting par value may be made.

The starting point of the file is the phrase "dissolved but not liquidated". There is no liquidator, no liquidation operations and no surplus to distribute: the estate passes directly. That is exactly what distinguishes the operation from a voluntary liquidation, where the company realises its assets, pays off its creditors and distributes the balance. It is also what distinguishes it from a conversion of legal form, where no company disappears and the legal person stays the same.

We regularly see files in which the director has already chosen a merger in order to "group two companies and recover the losses of the older one". Those two aims do not go together in Luxembourg, and the tax section below explains why. Deciding the fate of the losses before signing the draft terms of merger costs one meeting, and avoids an operation whose main benefit has vanished after signature.

What is the procedure and which deadlines apply?

The procedure for a merger by absorption in Luxembourg runs in four stages: the common draft terms of merger, their lodging with the trade and companies register for publication, making the documents available to shareholders, and the resolution of the meeting. A one-month period separates publication of the draft terms from the meeting, and a notarial deed closes the operation.

The one-month period is the pivot of the timetable, and it runs twice. The draft terms of merger must be lodged with the trade and companies register for publication in the Electronic Register of Companies and Associations at least one month before the resolution of the meeting on the merger. In parallel, at least one month before the date of the general meeting deciding on the common draft terms, the shareholder is entitled to inspect, at the registered office, the common draft terms of merger, the annual accounts and the management reports of the last three financial years of the merging companies.

In other words, the date of the notarial deed is not chosen last: it is set by the day the draft terms were lodged. In a group that wants a merger effective on the first day of a financial year, the draft must therefore be settled and lodged in the course of the preceding November, and the annual accounts of the last three financial years must be approved, filed and available at the registered office before the period even starts.

The merger then requires the approval of the shareholders or holders of securities carrying voting rights of each of the merging companies, under the attendance quorum and majority conditions provided for amendments to the articles of association. For a SARL, resolutions amending the articles are validly passed by a majority of the shareholders representing at least three quarters of the share capital. The resolution is finally received by the notary, who must verify and attest the existence and legality of the acts and formalities incumbent on the company before which he acts and of the draft terms of merger, and who issues a certificate.

What must the common draft terms of merger contain?

The common draft terms of merger in Luxembourg state the identification of the merging companies and of the company resulting from the merger, the exchange ratio, the amount of any cash payment, the delivery arrangements, the entitlement to profits and the accounting effective date. The identification covers the form, name and registered office of each company concerned.

That last item is the one that drives the accounting work, and it is also the one most often missing from draft terms written abroad. The common draft terms must state the date from which the operations of the absorbed company are treated, for accounting purposes, as carried out on behalf of the absorbing company. That date, not the date of the deed, determines which of the absorbed company's entries are taken into the absorbing company's annual accounts and from when the absorbed company's bookkeeping stops being kept on its own behalf.

The exchange ratio, for its part, is the only item in the draft terms that requires a valuation. It expresses how many securities of the absorbing company will be delivered for one security of the absorbed company, and it is the point addressed both by the report of the management body and by that of the independent expert. The cash payment serves to settle fractional entitlements, within the 10 % limit recalled above: it must not become the means of buying out a minority in cash, which would be a different operation.

Management report and expert report: when can they be waived?

The two reports required in a merger by absorption in Luxembourg, that of the management body and that of the independent expert, can be set aside, but only by a unanimous decision of all shareholders and holders of securities carrying voting rights. Neither an examination of the common draft terms of merger by independent experts nor an expert report is required if all the shareholders and holders of other securities carrying voting rights in each of the companies taking part in the merger have so decided.

The first report is that of the management body. It is addressed to the shareholders of the company and explains and justifies, from a legal and economic point of view, the common draft terms of merger and in particular the share exchange ratio. It is the document that makes the exchange parity contestable or uncontestable before minority holders, and the first item a shareholder will read during the month of availability.

The second is the report on the terms of the merger, drawn up for each company, whose involvement is mandatory. The managing bodies of the companies contemplating a merger may, however, agree on the appointment of a single independent expert, appointed by the president of the district court of the registered office of one of the companies to be merged. The report states whether the exchange ratio is relevant and reasonable, the methods used, whether they are adequate, the relative importance given to each, and any particular valuation difficulties.

One special case lightens the whole process. The so-called merger by confusion is the one where the absorbing company already holds the entire capital of the absorbed company before the merger is carried out: the merger being economically already done, the protective formalities may be lightened, the report of the management body and the report of the approved statutory auditor are not required, and the merger does not give rise to the issue of new shares. This is the usual route for pushing a wholly owned subsidiary up into its parent, and the one needing the least preparation.

When does the merger take effect, and who can still challenge it?

A merger by absorption in Luxembourg takes effect between the companies as from the merger deed, by operation of law transfer of the absorbed company's estate, but it is enforceable against third parties only through publication in the Electronic Register of Companies and Associations. Creditors then have two months to request security, and the action for nullity is open for six months.

The transfer of the estate is automatic and without formality, assets and liabilities together, and the transfer of liabilities covers both known debts and debts not disclosed in the merger. One reservation comes with it: the transfer of rights in rem other than security over securities, in particular over real estate and over industrial or intellectual property, must be carried out in accordance with the special laws applicable in order to be enforceable against third parties. The mortgage register or the trade mark register therefore does not update itself by the mere effect of the merger.

Creditors of the merging companies whose claim predates the date of publication of the deeds recording the merger may request that security be constituted for their claims. They must show that the merger is a risk for the exercise of their rights and that the company has not provided adequate guarantees. The request goes within two months to the district court in whose area the debtor company has its registered office.

Nullity, finally, can be pronounced only by the court, and only on limited grounds: the absence of a notarial deed and the nullity of the merger resolutions. The action for nullity is possible only for six months after publication, the court may grant the company a period to regularise the situation, and the decision pronouncing the nullity of the merger must be lodged with the trade and companies register for publication in the Electronic Register. That is why we never treat a merger file as closed on the day of the deed.

Tax treatment: rollover relief and losses that do not follow

The tax treatment of a merger by absorption in Luxembourg rests on a favourable regime consisting of a deferral of taxation of hidden reserves, which treats the merger as an intercalary operation entailing no cessation of business. The absorbed company's business is continued by the absorbing company, and the price of that neutrality is the carry-over of book values and the loss of the loss carry-forwards.

The regime is subject to precise conditions. The absorbing company must be an opaque fully taxable resident company, and the transfer must be made against the delivery of shares by the absorbing company or against the cancellation of a participation held by the absorbing company in the absorbed company. To ensure that the hidden reserves remain subject to future taxation, the absorbing company must carry in its own balance sheet the values as they appeared in the balance sheet of the absorbed company. There is therefore no revaluation and no new depreciation base: the tax saving hoped for from a step-up does not exist.

The decisive point lies elsewhere, and it still surprises groups used to other jurisdictions. Although the merger transfers the entire estate, the losses of the absorbed company cannot be taken over by the absorbing company, unless the absorbing and absorbed companies were subject to collective taxation: only the one who suffered the losses may deduct them. A stock of tax loss carry-forwards built up in the company being absorbed therefore disappears with it, whatever the economic value of the operation.

That rule drives the order of operations rather than prohibiting them. Where the losses are the main asset of the company to be absorbed, two questions arise before the draft terms of merger: can the direction of the absorption be reversed, so that the company carrying the losses is the absorbing one, and is a prior fiscal unity conceivable?

That regime requires a holding of at least 95 % of the capital, directly or indirectly, uninterrupted from the start of the financial year concerned, financial years opened and closed on the same dates and a commitment covering at least five financial years: not a decision taken in the month of the merger.

After the merger: employees, final balance sheet and last return

After a merger by absorption in Luxembourg, three consequences must be dealt with without delay: the absorbed company's employment contracts, which pass to the absorbing company by operation of law, its final balance sheet as at the day of absorption, and its last tax return.

On the employment side, a merger is a transfer of undertaking. The rules of articles L. 127-1 to L. 127-6 of the Labour Code, which transpose Council Directive 2001/23/EC of 12 March 2001, apply to any transfer resulting in particular from a contractual assignment, a merger, a succession or a demerger, and to all employees, including part-time, fixed-term and temporary agency staff.

All employment contracts in force on the day of the change subsist between the new employer and the employees, and they are transferred to the transferee by the mere effect of the law, without any formality. No amendment is therefore needed for the contract to survive, which does not remove the need to inform the employees and to update the employer filings.

On the accounting and tax side, the absorbed company must draw up a final balance sheet on the day of its absorption. It is that balance sheet which carries the values the absorbing company takes over unchanged, and it is that balance sheet which closes the absorbed company's last tax period. The corresponding return follows the ordinary calendar: it must be filed, duly completed and signed, by 31 December of the year following the tax year concerned with the competent tax office.

We advise dealing with these three consequences on the same timetable as the deed, not afterwards. A final balance sheet nobody asked for on the day of the deed is rebuilt months later, from bookkeeping already folded into that of the absorbing company, for far more time than drawing it up on the right date would have taken. The order of magnitude of the fees is set out in our fee schedule; what makes it vary is almost never the deed, it is the quality of the opening accounts.

Sources and verification

Written for Financial Services Luxembourg and reviewed before publication by Mickaël LOC, authorised accountant (authorisation 10077274). The sources were verified on 4 October 2026, the date on which every deadline, condition, threshold and legal reference cited here was cross-checked against an official source.

The sources consulted are the following. On Guichet.lu, the "Mergers and acquisitions of companies" page of the corporate restructuring section gives the definition of a merger by absorption and of a merger by incorporation of a new company; the dissolution without liquidation and the transfer of the entire estate, assets and liabilities; the cash payment limited to 10 % of the nominal value or accounting par value of the securities allocated; the lodging of the draft terms with the trade and companies register for publication in the Electronic Register at least one month before the resolution of the meeting;

the shareholder's right to inspect at the registered office the common draft terms, the annual accounts and the management reports of the last three financial years at least one month before the meeting; and the items of the common draft terms, including the accounting effective date.

The same page carries the purpose of the report of the management body; the mandatory nature of the report on the terms of the merger and the appointment of an independent expert by the president of the district court; the content of that report; the unanimous waiver by shareholders and holders of securities carrying voting rights; and the merger by confusion with the exemptions that go with it.

It carries, finally, the transfer of the estate by operation of law and enforceability against third parties through publication; the reservation covering rights in rem subject to special laws; the creditors' request for security within two months before the district court; and nullity pronounced by the court alone, its limited grounds, the six-month period and the possibility of a period for regularisation.

The "Tax impact of maintaining or integrating a company" page gives the deferral of taxation of hidden reserves; the treatment as an intercalary operation without cessation of business; the opaque fully taxable resident status required of the absorbing company; the consideration in shares or in cancellation of a participation; the carry-over of the values of the absorbed company's balance sheet; the final balance sheet drawn up on the day of the absorption; and the impossibility for the absorbing company to take over the absorbed company's losses unless both were subject to collective taxation.

The "Fiscal unity regime" page gives the holding of at least 95 % directly or indirectly, its uninterrupted nature from the beginning of the financial year, the identical financial year dates and the commitment covering at least five financial years. The "General meeting of the shareholders of a SARL or a SARL-S" page gives the majority of shareholders representing at least three quarters of the share capital where the articles are amended. The questions and answers of the Labour and Mines Inspectorate on transfer of undertaking attach mergers to articles L.

127-1 to L. 127-6 of the Labour Code and to Directive 2001/23/EC, and give the scope covering all employees as well as the survival of employment contracts transferred without formality. The pages of the Luxembourg Inland Revenue on the corporate income tax return give the filing by 31 December of the year following the tax year.

Finally, the amended law of 10 August 1915 on commercial companies carries the requirement of a notarial deed; the approval by the shareholders or holders of securities carrying voting rights of each company, under the quorum and majority conditions provided for amendments to the articles; and the notary's duty to verify and attest the existence and legality of the acts and formalities and to issue a certificate.

Three points could not be verified in their primary source and are therefore not asserted here. The full text of the sources: the domains guichet.public.lu, legilux.public.lu, impotsdirects.public.lu and itm.public.lu are blocked by the network proxy of our editorial environment, and these pages were read through indexed extracts using a search restricted to official domains; the quotations above reproduce those extracts without extrapolation.

The exact numbering of the articles of the title devoted to mergers in the coordinated law of 1915: the rules cited are those stated by Guichet.lu and by the law, but we do not attach each rule to an article number we have not read.

And the precise attendance quorum and majority fractions specific to the public limited company, as well as the formalities for striking the absorbed company off the register: only the reference to the conditions for amending the articles is reproduced here, and the figure is given for the SARL alone, where it could be cross-checked. These points can be verified in the coordinated text of the law of 10 August 1915 on legilux.public.lu, on the "Mergers and acquisitions of companies" page of guichet.public.lu, and with the acting notary for an individual file.

This article sets out the state of the law at the date of publication and does not constitute personalised legal or tax advice: the direction of the absorption, the reports required, the fate of the loss carry-forwards and the timetable depend on the form of the companies concerned, the structure of their shareholding, their net position and their tax history. Report an error to contact@financialservices.lu: the correction is dated in the article.