Net wealth tax reduction in Luxembourg: 5-year reserve
The net wealth tax reduction in Luxembourg trades five euros of locked reserve for one euro of tax saved. The cap, the timing and the traps of the five-year period.
What is the net wealth tax reduction in Luxembourg?
The net wealth tax reduction in Luxembourg is the mechanism of paragraph 8a of the net wealth tax law: on request, a company obtains a reduction of that tax by booking a reserve equal to five times the amount claimed, a reserve it must then keep on its balance sheet for at least five tax years.
The regime is administered by the Administration des contributions directes, which sets it out in its page on the net wealth tax reduction for collective entities and detailed it in circular I. Fort. no. 47quater of 17 May 2018, applicable to tax assessed at the key date of 1 January 2017 and at subsequent key dates.
The arithmetic fits in one sentence: the company locks up five euros of equity to save one euro of tax. Freezing EUR 1,000 of reserve for five financial years wipes out EUR 200 of net wealth tax. The saving is clean, because net wealth tax sits, alongside corporate income tax and municipal business tax, among the operating expenses that are not deductible for collective entities.
The regime nonetheless concerns only part of the Luxembourg corporate population: companies whose ordinary tax exceeds the statutory floor and which paid corporate income tax in the previous year. A holding company paying the minimum gains nothing from the reserve, for the reasons set out in our article on the minimum net wealth tax.
| Parameter | Applicable rule |
|---|---|
| Reduction obtained | One fifth of the reserve booked on the balance sheet |
| Reserve to be created | Five times the amount of the reduction claimed |
| Lock-up period | Five tax years at least |
| Cap | Corporate income tax plus employment fund, due before imputations, of the previous year |
| Request | In the tax return of the preceding tax year |
| Early distribution | Net wealth tax increased by one fifth of the reserve used |
The cap on the reduction: corporate income tax of the preceding year
The net wealth tax reduction in Luxembourg is capped at the amount of corporate income tax, increased by the employment fund contribution and due before any imputation, for the tax year immediately preceding the one for which the reduction is claimed.
That cap changes the nature of the regime. A company with no taxable profit in the previous year has no corporate income tax to set against the claim and obtains no reduction at all, however high its net wealth tax may be. The structures taxed most heavily on wealth, large assets and thin profitability, are precisely the ones the cap excludes.
The words "due before any imputation" refer to the tax as assessed, before the imputations that reduce the balance actually payable: the cap is read on the assessed tax of the previous year, not on that year's cash payment.
Computing the cap is therefore the first figure to establish, before any discussion of the size of the reserve. We regularly see the reverse order on engagements: a reserve calibrated on the net wealth tax of the year, then halved because the previous year's corporate income tax does not support it. The check takes minutes on the previous year's assessment notice.
| Item | Company A, profitable in N-1 | Company B, loss-making in N-1 |
|---|---|---|
| Corporate income tax plus employment fund of the previous year | EUR 40,000 | EUR 0 |
| Ordinary net wealth tax of the year | EUR 60,000 | EUR 60,000 |
| Maximum reduction available | EUR 40,000 | EUR 0 |
| Reserve to be booked | EUR 200,000 | Not applicable |
| Net wealth tax still payable | EUR 20,000 | EUR 60,000 |
When must the reserve be created, and when is it released?
A claim for the net wealth tax reduction of a year N is made in Luxembourg in the tax return for year N-1, and the reserve must be booked in the balance sheet of the last financial year closed during year N.
The return concerned is the one covering corporate income tax, municipal business tax and net wealth tax. As for the rule of the last financial year closed during year N, it produces an effect few files anticipate: a company that decides, during that same year N, to close on 30 September rather than 31 December must create the reserve through that 30 September balance sheet. Changing the year-end brings the deadline forward without warning.
Release follows an equally dated mechanic. Guichet.lu takes the example of a company seeking an exemption of 200 for year N: it must create a reserve of 1,000, that is 200 multiplied by five, and that reserve may only be distributed in N+6. A reduction claimed for 2026 therefore locks the matching reserve until 2032.
We regularly see the gap between the claim and the entry: the box is ticked in the return, the reserve is never allocated, and the assessment notice cancels the reduction two years later. The tax claim and the allocation of results are two acts on two calendars; joining them means dealing with the question when the annual accounts are approved, not when the return is filed.
The allocation entry and the standard chart of accounts
The net wealth tax reserve is booked in Luxembourg as an allocation within equity, never through the profit and loss account: the standard chart of accounts gives it account 1381, "Réserve pour l'impôt sur la fortune".
That dedicated account, separate from other non-distributable reserves in account 1382 and other distributable reserves in account 1383, is not a presentation nicety. During the five-year period the reserve is not distributable: it leaves the amount the meeting may allocate as a dividend, and a reader of the filed accounts must be able to tell it apart from free reserves.
The circular recommends opening one five-year reserve account per tax year. The reason is arithmetical: several vintages coexist in the equity of a company that uses the regime every year, each with its own release date. A single account fed year after year makes it impossible to demonstrate that a distribution relates to a vintage already released.
That is the situation we meet most often when taking over a file: one global "net wealth tax reserve" line, with no breakdown, in a company that has been claiming the reduction for six or seven years. Rebuilding the vintages from the minutes, the assessment notices and the filed accounts takes half a day to a day, billed at the hourly rate in our pricing grid.
| Year of the reduction | Reserve booked | Reduction obtained | Distribution possible |
|---|---|---|---|
| 2022 | EUR 150,000 | EUR 30,000 | From 2028 |
| 2023 | EUR 100,000 | EUR 20,000 | From 2029 |
| 2026 | EUR 200,000 | EUR 40,000 | From 2032 |
Distributing the reserve early costs one fifth of the amount used
Distributing all or part of the reserve before the five-year period expires triggers a measured and automatic consequence in Luxembourg: the net wealth tax of the year concerned is increased by one fifth of the amount of the reserve used.
The clawback is in fact a repayment. One fifth of the reserve is exactly the reduction obtained at the time: the company gives the benefit back, no more and no less. What changes is the timing, since the increase hits the tax of the year of the distribution.
An exception exists for the restructuring operations covered by articles 170 and 172 of the amended law of 4 December 1967 on income tax: the holding condition is not broken, provided the reserve is continued by the receiving entity so as to satisfy the five-tax-year period. A merger does not erase the commitment, it passes it on.
The risk is almost never a deliberate distribution of the reserve. We regularly see a dividend decided on the distributable equity figure displayed by a piece of software, with no reading of the sub-accounts, or a capital transaction that absorbs the reserve on the way. The safeguard fits in two lines: a note in the annex to the annual accounts, a reminder of the locked vintages in the allocation resolution.
What the reduction cannot do: the minimum, groups, advances
The net wealth tax reduction cannot bring the tax below its minimum in Luxembourg: the Administration des contributions directes states expressly that the minimum net wealth tax cannot be reduced by creating a reserve. The mechanism operates on the ordinary tax, never on the floor.
That point aims straight at holding structures. Since tax year 2025 the minimum is EUR 535 where the balance sheet total is EUR 350,000 or less, EUR 1,605 up to EUR 2,000,000 and EUR 4,815 above, while the ordinary tax is 5 per thousand of taxable wealth up to EUR 500,000,000, then EUR 2,500,000 plus 0.5 per thousand of the excess. A holding company whose participations are exempt under the parent-subsidiary regime falls below the floor: the reserve is of no use to it.
Integrated groups follow their own logic. No consolidation exists for net wealth tax, and each company in the group remains liable on its own taxable wealth. Guichet.lu specifies, however, that capital companies belonging to an integrated group benefit each year from a reduction of one fifth of the reserve created, without exceeding the corporate income tax increased by the employment fund contribution owed by the group before any imputation, each company being able to benefit according to its profits or available reserves, whichever company created the reserve.
Cash flow, finally, follows its own rhythm. Quarterly advances of net wealth tax for collective entities fall due on 10 February, 10 May, 10 August and 10 November, set in principle at a quarter of the tax resulting from the last assessment established: the reduction reaches the advances only once the assessment notice is issued, and without a request for revision the company keeps paying on the old basis. The filing route is described on our corporate tax return page, and the net wealth tax return form for resident collective entities states that it must be filed with the competent tax office by 31 May at the latest.
Sources and verification
Written for Financial Services Luxembourg and reviewed before publication by Mickaël LOC, licensed accountant (authorisation 10077274). The rules, thresholds, dates and references in this article were verified on 9 September 2026 against the official sources listed below.
The Administration des contributions directes page on the net wealth tax reduction for collective entities, for the reserve equal to five times the reduction claimed, the minimum period of five tax years, the cap equal to corporate income tax increased by the employment fund contribution and due before any imputation for the immediately preceding tax year, the one-fifth increase on early distribution, the exception for the restructuring operations of articles 170 and 172 of the amended law of 4 December 1967 and the impossibility of reducing the minimum. Circular I. Fort. no. 47quater of 17 May 2018, applicable to tax assessed at the key date of 1 January 2017 and at subsequent key dates, for the claim made in the return of the preceding tax year, the booking of the reserve in the balance sheet of the last financial year closed during the year of the reduction, the example of a year-end changed to 30 September and the recommendation of one five-year reserve account per tax year; it succeeded circular I. Fort. no. 47ter of 16 June 2016. The guichet.lu pages on net wealth tax and on the fiscal unity regime, for the example of a reduction of 200 against a reserve of 1,000 not distributable before N+6, the absence of consolidation in net wealth tax and the rules specific to integrated groups. The ACD pages on the net wealth tax scale for collective entities, non-deductible operating expenses, the tax calendar and tax advances, for the 5 per thousand rate and the EUR 500,000,000 step, the minimums of EUR 535, EUR 1,605 and EUR 4,815 applicable from tax year 2025, the non-deductible nature of the three taxes for collective entities and the advances of 10 February, 10 May, 10 August and 10 November. The ACD net wealth tax return form for resident collective entities for 2025, for filing by 31 May at the latest. The standard chart of accounts published by the Commission des normes comptables, for accounts 1381, 1382 and 1383.
Four limits must be flagged. The text of paragraph 8a could not be read in its published version, as legilux.public.lu and the ACD PDF files are not reachable from our drafting environment: the official sources were consulted through indexed extracts, and we report their substance without quoting their wording. The list of imputations covered by the words "due before any imputation" was not verified. The accounting origin accepted for funding the reserve, the result of the year or earlier free reserves, is not specified by the sources consulted, and neither is the fate of a reserve still within its five-year period on a liquidation. The worked examples and the vintage tracking table are constructions of the firm. Readers can check these points on legilux.public.lu and with their tax office.
This article states the law as it stands at the date of publication. Thresholds, rules and timetables change, and any decision committing your structure must be verified as at the date you rely on it. Report an error to contact@financialservices.lu: the correction is dated in the article.
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