Tax consolidation allows qualifying Luxembourg companies to combine their taxable results. A loss in one member can then offset profit in another member during the same year, subject to the detailed rules in Article 164bis of the Income Tax Law.
The regime does not merge the companies. Each member keeps its legal personality, books and annual accounts. The main change is that the taxable results are combined at one integrating company for corporate income tax and municipal business tax. The current Income Tax Law sets the conditions and the treatment of losses, interest and other tax attributes.
The two possible group structures
Vertical consolidation applies when a qualifying Luxembourg parent directly or indirectly holds its integrated subsidiaries. The parent becomes the integrating company and receives the combined taxable result.
Horizontal consolidation can apply to qualifying Luxembourg sister companies under a common parent. One Luxembourg subsidiary becomes the integrating company. It must occupy a position in the group hierarchy at least as close to the common parent as the other members.
The tax authority’s overview also describes the eligible parent and permanent-establishment situations. The precise chain must be tested before assuming that a foreign group can place its Luxembourg entities in one fiscal unit.
The 95% ownership condition
The normal threshold is at least 95% of the subsidiary’s capital. A direct holding can satisfy the test. An indirect holding can also qualify, but the intermediate entities in the chain must meet the statutory conditions.
The 95% condition must be met without interruption from the beginning of the first financial year for which consolidation is requested. A transaction that changes the chain during the year can therefore affect the regime even when the year-end structure appears compliant.
An exceptional route exists from 75%. It requires the participation to support the expansion and structural improvement of the national economy, a favourable assessment involving the Minister of Finance, and consent from minority shareholders representing at least 75% of the capital not held by the parent. This is a narrow exception, not an ordinary alternative to the 95% test.
Eligible companies and aligned years
Members are normally fully taxable Luxembourg capital companies or qualifying Luxembourg permanent establishments. The law excludes certain securitisation undertakings, SICARs and RAIFs within the specified statutory category.
All members must open and close their financial years on the same dates. This alignment matters because each company’s result is calculated for the same period before the totals are combined. A group with different year-ends must address that difference before the first integrated year.
A company can belong to only one consolidated group at a time. The perimeter should therefore be mapped across the full ownership chain, including any entity already participating in another unit.
The joint request and five-year period
The companies submit a joint written request to the Luxembourg Inland Revenue before the end of the first financial year covered. A horizontal request must also identify the integrating subsidiary.
The requested period must cover at least five financial years. During that period, the ownership condition and the common opening and closing dates must continue to be met. A disposal, restructuring or investor entry can therefore affect more than the year in which it occurs.
The five-year period is not merely an administrative preference. An early break can jeopardise the regime under Article 164bis, so planned ownership changes should be considered before the request is filed.
How the group result is calculated
Each member still prepares an individual tax return and determines its own net income. The integrating company then combines the members’ net results and applies the group-level adjustments required by Article 164bis.
| Item | Treatment during consolidation |
|---|---|
| Current net results | Combined at the integrating company |
| Corporate income tax | Assessed on the integrated taxable result |
| Municipal business tax | Follows the integrated result under the applicable rules |
| Net wealth tax | Assessed separately for each company |
Transactions between members are not erased from the accounts. The law instead requires a correction where the regime would otherwise create double taxation or a double deduction.
The treatment of losses
Losses from before entry do not become a free pool for the entire group. They can be taken into account through the integrating company only to the extent that the member that incurred them could have used them under individual taxation. Any amount that cannot be used under that rule remains attributed to the original member.
Losses produced by the integrated result follow a separate rule. They are carried by the integrating company under the ordinary loss-carryforward conditions. If a subsidiary later leaves, those integrated-period losses are not transferred to it.
This distinction makes the starting position important. A group with significant historic losses should separate pre-entry attributes from expected losses during the five-year period before measuring the effect of consolidation.
Annual compliance and structural changes
Tax consolidation requires recurring evidence, not only an entry request. Each member continues to maintain separate accounting, approve its own annual accounts and file its individual tax return. The integrating company also reports the combined calculation.
Ownership percentages, intermediate entities and financial-year dates should be checked each year. Changes involving a SOPARFI, a financing vehicle or an operating subsidiary may alter the perimeter. Interest-limitation calculations and tax attributes also require group-specific analysis rather than a simple addition of profits and losses.
Conclusion
Luxembourg tax consolidation can offset current profits and losses within a qualifying group. The benefit depends on a stable structure that can maintain the 95% threshold, aligned financial years and the five-year period. Each entity keeps its separate legal existence and accounts, while the integrating company carries the combined taxable result and the regime’s continuing reporting obligations.
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Frequently Asked Questions
What is the ownership threshold for Luxembourg tax consolidation?
At least 95% of the subsidiary's capital must normally be held directly or indirectly. The condition must remain satisfied without interruption from the beginning of the first financial year covered by the request.
Can sister companies form a tax-consolidated group?
Yes. Horizontal consolidation can place qualifying Luxembourg sister companies under a Luxembourg integrating subsidiary when the statutory common-parent and hierarchy conditions are met.
Which taxes are covered by the regime?
The group result is used for corporate income tax and municipal business tax. Net wealth tax is not consolidated, so each company remains assessed separately for that tax.
How long does Luxembourg tax consolidation last?
The joint request must cover at least five financial years. Eligibility conditions, including the ownership threshold and aligned financial years, must continue throughout the period.
Can losses from before entry be used by the group?
Pre-entry losses remain linked to the company that incurred them. They can be used through the integrating company only within the limits applicable to losses arising before entry. Losses from the integrated result follow a different rule and remain with the integrating company after a member leaves.
