Intra-group loan interest accruals in Luxembourg
Intra-group loan interest accruals in Luxembourg go on the balance sheet even where nothing is paid. Period allocation, arm's length rate, the article 168bis cap and symmetry between lender and borrower.
Do intra-group loan interest accruals have to be booked in Luxembourg?
Intra-group loan interest accruals in Luxembourg belong to the year over which the interest ran, not to the contractual payment date: an undertaking keeps accrual accounts rather than cash accounts, which requires it to book receivables acquired and liabilities incurred regardless of the date they are collected or paid.
The rule bites on both sides of the same transaction. The borrowing company books an interest charge and a liability; the lending company books income and a receivable. Same base, same period, same rate: that symmetry is the first thing an audit tests, because it cannot be simulated after the event.
The trap is the bullet loan, where interest is settled only with the principal. No cash moves for three or five years and the file stays silent; yet every closing must carry its share of interest, failing which the result for the year is wrong in both companies at once.
The subject goes beyond the entry itself. The rate chosen is a transfer pricing question, its deduction runs into the article 168bis cap, and its payment falls under a withholding regime specific to interest. The wider framework is set out on our intra-group financing page.
| Question | Applicable rule |
|---|---|
| Year of allocation | The year over which the interest ran, whatever the payment date |
| Accounting basis | Accrual accounting: receivables acquired and liabilities incurred, regardless of collection or payment |
| Applicable rate | The arm's length rate, articles 56 and 56bis of the amended law of 4 December 1967 |
| Guidance of reference | Circular L.I.R. no. 56/1 - 56bis/1 of 27 December 2016 |
| Deduction cap | 30% of tax EBITDA, or the de minimis threshold of 3,000,000 euros (article 168bis) |
| Withholding tax on the interest | None where the lender is a company |
| Sanction for an excessive rate | Only the excessive portion is recharacterised as a hidden profit distribution |
What accrual accounting requires at the closing date
Accrual accounting requires a Luxembourg company to record interest accrued but not yet due: receivables acquired that have become certain in principle and in amount are taken into account even where they have not yet been settled.
The computation is a time apportionment, and it is read off the contract: principal outstanding, rate, day count basis, periodicity and any compounding of interest fallen due. Without those parameters the amount booked cannot be recomputed by a third party, which is precisely what a third party will ask of it.
Presentation follows the schemes aligned with directive 2013/34/EU, introduced for financial years beginning on or after 1 January 2016. Amounts owed by affiliated undertakings and amounts owed to affiliated undertakings are split by residual maturity, one year or less and more than one year: interest accrued on a long-term loan usually joins the short bucket, since it will fall due within the year.
A loan in a foreign currency adds a layer. The Commission des normes comptables holds that a transaction denominated in a foreign currency is recorded, on initial recognition, at the exchange rate of the transaction date, Luxembourg accounting law imposing no particular rate source; a weekly or monthly average rate is accepted where volume makes the precise date impracticable. The general framework is covered on our LuxGAAP accounting page.
The written contract does not set the rate, the conduct of the parties does
An intra-group loan in Luxembourg can be analysed even without a written contract: for the comparability analysis, circular L.I.R. no. 56/1 - 56bis/1 of 27 December 2016 states that whether or not the transaction was formalised in writing is immaterial.
The rest of the sentence carries the real rule: the conduct of the parties to the transaction is paramount in identifying and accurately delineating the controlled transaction. A contract nobody applies therefore protects nothing, and regular flows with no contract remain entirely capable of being characterised.
The circular addresses companies carrying out intra-group financing transactions, defined as any activity consisting in granting loans or advances of funds remunerated by interest to related undertakings, refinanced by financial means and instruments such as public issues, private borrowings, advances of funds or bank loans. It replaced circulars L.I.R. no. 164/2 of 28 January 2011 and no. 164/2bis of 8 April 2011 from tax year 2017 onwards.
One confusion is worth avoiding since spring 2026: circular L.I.R. no. 56/2 - 56bis/2 of 13 April 2026 does not deal with financing. It sets out how Luxembourg implements Amount B of the OECD's Pillar One, which covers baseline marketing and distribution activities, and applies to financial years beginning on or after 1 January 2025. The documentation expected is detailed on our transfer pricing page.
An arm's length rate, or a hidden profit distribution
The rate on an intra-group loan in Luxembourg must be the one independent undertakings negotiating in comparable circumstances would have agreed: failing that, the excessive portion of the interest is recharacterised as a hidden profit distribution.
Guichet.lu describes the mechanism plainly. Where the shareholder derives from the loan an advantage they would not normally have obtained had they not held that capacity, the interest paid is recharacterised as a hidden dividend distribution; where the rate exceeds what a third party would have required in the same situation, only the excessive portion is recharacterised.
The reverse situation is watched just as closely: an interest-free loan, or one carrying a rate below the market rate, is among the examples of advantages recharacterised as hidden profit distributions. An intra-group advance left free of charge for a shareholder's benefit is therefore never neutral.
Excessive debt produces a neighbouring effect: thin capitalisation leads to the borrowed funds being recharacterised as equity and the excessive interest as hidden dividends. Two structures sit outside the debate for a reason of principle: a sole trader and a transparent partnership cannot deduct interest paid to their operator or to their partners, which constitutes private drawings rather than business expenses.
Article 168bis caps the deduction of interest
The deduction of interest on an intra-group loan in Luxembourg is capped by article 168bis: exceeding borrowing costs are deductible only up to 30% of tax EBITDA, a de minimis threshold of 3,000,000 euros remaining deductible in any event.
The notion is a net one, which changes everything for a financing company. Exceeding borrowing costs are the difference between the deductible borrowing costs borne by the taxpayer and its taxable interest revenues or other economically equivalent taxable revenues; only deductible borrowing costs enter that computation. A back-to-back structure, which on-lends what it borrows, therefore shows no more than a residual excess.
Borrowing costs fall into three categories: interest expenses on all forms of debt, other costs economically equivalent to interest, and expenses incurred in connection with the raising of finance. Tax EBITDA is made up of total net revenues, increased by the tax values corresponding to exceeding borrowing costs, to depreciation charges computed and to impairment deductions taken.
Two release valves exist. Unused deduction capacity, meaning the part of the 30% that the year's deducted borrowing costs do not absorb, serves as a reserve for the five subsequent operating years. Paragraph 8 also sets the limitation aside for a financial undertaking or a standalone entity, defined as a taxpayer that is not part of a consolidated group for financial accounting purposes and has neither an associated enterprise within the meaning of article 164ter(2) nor a permanent establishment in another State. The form "Exceeding borrowing costs incurred according to article 168bis L.I.R." is annexed to form 500, the corporate tax return.
| Parameter | Applicable rule |
|---|---|
| Base of the limitation | Exceeding borrowing costs, net of taxable interest revenues and economically equivalent revenues |
| Proportional cap | 30% of the taxpayer's tax EBITDA |
| De minimis threshold | 3,000,000 euros, deductible irrespective of the 30% limit |
| Composition of tax EBITDA | Total net revenues, increased by exceeding borrowing costs, depreciation computed and impairment deductions |
| Unused deduction capacity | Carried forward to the five subsequent operating years |
| Derogation | Financial undertaking or standalone entity within the meaning of article 168bis |
| Filing formality | Form "Exceeding borrowing costs incurred according to article 168bis L.I.R.", annexed to form 500 |
No withholding tax on interest, unlike a dividend
Paying interest on an intra-group loan in Luxembourg triggers no withholding tax where the lender is a company: companies with legal personality, resident or not, receive the interest owed to them without any withholding at source.
The only withholding provided for on interest points elsewhere. The 20% final withholding applies to certain interest paid or attributed by a paying agent established in Luxembourg to beneficial owners who are individuals resident in the Grand Duchy; non-resident beneficiaries are not subject to it and declare that interest in their State of residence.
The gap with a dividend is stark. A distribution bears in principle a withholding of 15% of the gross amount, unless the parent-subsidiary regime applies; the mechanism and its deadlines are set out in our article on Luxembourg dividend withholding tax.
That difference in treatment explains the attention paid to characterisation. Recharacterised as a hidden profit distribution, interest changes regime: depending on the capacity of the shareholder and of their holding, the company must then operate a withholding on investment income. The absence of withholding on interest is not a given; it follows from a characterisation that holds.
Three errors we meet when taking over a file
Three errors come back in almost every file carrying intra-group loans that we take over: asymmetry between the two companies, interest never accrued for want of a due date, and an intra-group balance never confirmed.
Asymmetry is the most expensive because it is visible. The lender books twelve months of interest and the borrower eleven, or one applies the rate in the amendment while the other stayed on the original contract. The gap survives from one year to the next and makes the balance impossible to reconcile the day somebody asks for it.
The second comes from reading the cash. Nothing was paid, so nothing was booked: the reasoning collapses once the receivable is acquired and certain in principle and in amount. It distorts the result, the taxable base and, in a holding company, the net assets that carry net wealth tax.
The third is the easiest to deal with and the most often neglected. A reciprocal balance confirmation, signed by both companies as at the same closing date, takes a few minutes; rebuilt a year later from statements and emails, it takes a full day. We regularly see that work redone under pressure, when the tax office or an incoming investor asks, and the annual accounts filing timetable then leaves no room.
Sources and verification
Written for Financial Services Luxembourg and reviewed before publication by Mickaël LOC, licensed accountant (authorisation 10077274). The principles, dates, thresholds and references in this article were verified on 11 September 2026 against the official sources listed below.
Four guichet.lu pages were consulted. The page on the operating result of a capital company, for the rule that undertakings keep accrual rather than cash accounts and must book receivables acquired and liabilities incurred regardless of the date of collection or payment, and for the recognition of receivables that have become certain in principle and in amount. The page on methods for the preparation of annual accounts, for the allocation of general expenses to the year they relate to. The pages on debt financing and the deductibility of interest and on dividend distributions, for the recharacterisation of the excessive portion of the rate alone, the example of an interest-free loan or one below the market rate, the consequences of thin capitalisation and the treatment of interest paid by a sole trader to its operator. The page on the taxation of interest paid to lenders, for the absence of withholding on interest owed to companies, together with the RELIBI documentation of the Administration des contributions directes for the 20% final withholding. From the Administration des contributions directes: circular L.I.R. no. 56/1 - 56bis/1 of 27 December 2016, for the definition of intra-group financing transactions, the irrelevance of a written form in the comparability analysis, the role of the conduct of the parties and the replacement of circulars no. 164/2 and no. 164/2bis from tax year 2017; circular L.I.R. no. 56/2 - 56bis/2 of 13 April 2026, for its own subject matter, Amount B of Pillar One; circular L.I.R. no. 168bis/1 and the form "Exceeding borrowing costs incurred according to article 168bis L.I.R.", for exceeding borrowing costs, tax EBITDA, the 30% cap, the de minimis threshold, the carry-forward of unused capacity and the derogation for standalone entities. Finally Q&A 16/010 and Q&A 22/027 of the Commission des normes comptables, for the balance sheet schemes aligned with directive 2013/34/EU and for the initial recognition of a foreign currency transaction at the rate of the transaction date.
Three limits must be flagged. The coordinated text of articles 56, 56bis and 168bis of the amended law of 4 December 1967 on income tax was not read in its consolidated version: the files of the Administration des contributions directes and legilux.public.lu are unreachable from our drafting environment, and those provisions were consulted through indexed extracts. The date of the latest version of circular L.I.R. no. 168bis/1, published in January 2021 and revised since, could not be confirmed. Finally, the numbering of the standard chart of accounts entries used for accrued interest was not verified, the article keeping to balance sheet and profit and loss captions; readers can confirm these points on legilux.public.lu, on impotsdirects.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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