Tax unity and M&A: Tax pitfalls, timing and clean solutions

You have a group structure in which a parent company, as the controlling company (OT), holds a subsidiary, as the controlled company (OG), based on a profit and loss transfer agreement (PLTA). This structure is tax-efficient and widespread among German SMEs. However, the moment a sale is imminent, it becomes apparent that this efficiency comes at the cost of considerable structural complexity.

What initially appears to be a classic share deal quickly develops into a complex issue at the intersection of tax law, corporate law, and transaction practice. The challenge lies less in the sale itself than in the correct timing and economic classification of the tax unity.

Tax unity: tax advantage with structural ties

For income tax purposes, a tax unity allows profits and losses to be combined for tax purposes. The profit of the subsidiary is attributed to the parent company and taxed there. This requires, in particular, a valid profit and loss transfer agreement and a corresponding financial integration.

This structure creates tax efficiency, but at the same time leads to close legal and economic interrelationships between the companies. It is precisely this interrelationship that becomes problematic in the context of transactions, because it makes a clear separation between the seller's and buyer's periods difficult.

The central problem: timing between signing and closing.

In practice, signing and closing rarely coincide. There is often a period of several weeks or months between the contractual agreement and the completion of the transaction. During this time, the tax unity remains unchanged.

This means that the subsidiary continues to generate profits which – as long as the profit transfer agreement remains in effect – belong to the parent company. At the same time, it is already clear that the economic allocation of these profits will be the subject of the transaction.

This is where the real tension arises: The tax unity follows its own logic, while the transaction requires a clear economic demarcation.

Termination of the tax unity: not automatic.

The profit and loss transfer agreement does not automatically end with the sale. Rather, it must be actively terminated. A distinction must be made between two legally distinct methods: mutual termination and termination – particularly for good cause.

The mutual termination of a profit and loss transfer agreement is the standard procedure. It generally takes place at the end of a fiscal year. This is based on the tax requirements for a tax unity under Section 14 of the German Corporation Tax Act (KStG). Tax recognition requires that the profit and loss transfer agreement be concluded for a minimum of five calendar years and actually implemented during this period. This implementation is linked to full fiscal years.

A mid-year cancellation would disrupt this system. In such cases, the tax authorities cannot recognize the tax unity – retroactively – because the minimum holding period was not properly observed. This would result in significant tax adjustments, particularly the retroactive denial of loss carryforwards. For this reason, cancellation is practically only possible with certainty at the end of a fiscal year.

This is distinct from the termination of the profit transfer agreement for good cause. Such termination can also occur during the fiscal year and does not automatically invalidate the tax unity – provided the good cause is recognized for tax purposes. A typical good cause exists when the economic basis of the agreement ceases to exist, for example, upon the sale of the stake in the subsidiary.

However, this distinction is not without risk. Not every transaction is automatically recognized as a valid reason for tax purposes. Particularly in the case of purely planned, economically motivated restructurings, the tax authorities may critically examine whether a genuine reason exists or whether the restructuring is merely motivated by tax considerations.

For precisely this reason, termination is often not the sole solution in practice. Instead, the structure is adjusted to allow for termination at the end of a – possibly shortened – fiscal year. This ensures the tax recognition of the tax unity and simultaneously guarantees a smooth transition within the transaction.

The practical solution: a short fiscal year and a clean break.

In order to resolve the time discrepancy between the transaction and the financial year, the use of a short financial year has become particularly established in practice.

Shortening the fiscal year of the controlled company creates a clearly defined cut-off date on which the tax unity ends. All profits generated up to that point are deferred and transferred. From this point onward, there is no further profit transfer, and the buyer takes over an economically "cleaned-up" company.

This approach involves administrative effort, particularly with regard to coordinating commercial and tax law. However, it offers a high degree of legal certainty and significantly reduces the risk of future disputes.

The balance sheet and earnings problem in the closing year

A particularly sensitive point is the allocation of results in the year of closing. The profit of the subsidiary up to the termination of the profit and loss transfer agreement (EAV) economically belongs to the parent company. At the same time, this profit is usually not yet definitively determined at the time of closing.

This creates an intermediate phase in which the economic allocation and the actual numerical basis diverge. In practice, this problem is solved through estimates and subsequent settlements. However, this requires that the underlying mechanism is clearly agreed upon.

Purchase price and profit transfer: economic allocation

The specific features of the tax unity directly affect the purchase price. The buyer does not acquire the company along with the profits generated up to that point, as these belong to the seller via the profit transfer agreement.

This economic separation must be reflected in the purchase price. Depending on the structure, this is achieved through a locked-box mechanism or closing accounts. Crucially, there must be no ambiguity as to which period is economically attributable to the seller and which to the buyer.

The repercussions of the tax unity

Even after the termination of the tax unity, legal and economic ties persist.

A key issue is the liability of the controlling entity for the debts of the controlled entity incurred during the period of the tax unity. This liability continues for several years and can even become relevant after the sale.

Furthermore, claims arising from the profit transfer agreement may remain, for example, in connection with incompletely transferred profits or subsequent adjustments. These issues regularly give rise to disputes in practice if they are not clearly regulated.

Typical provisions in a Share Purchase Agreement

Against this background, the SPA plays a central role. It must explicitly address the specific characteristics of the tax unity and translate them into clear regulations.

In particular, it must be determined when and how the profit transfer agreement ends and how the results of the current fiscal year are to be allocated economically. It must also be ensured that this allocation is correctly reflected in the purchase price logic.

Furthermore, indemnification agreements are needed to protect the buyer from liability risks arising from the period of the tax unity. Finally, the practical handling of outstanding claims must also be regulated to avoid future disputes.

A real-world example: The sale of the holding company

A family business consists of a holding company as the controlling entity and two operating companies as controlled entities, linked by profit transfer agreements. The founder sells the entire structure to a financial investor.

From a purely legal standpoint, the tax unity could continue, as nothing changes. In practice, however, it is often terminated before closing.

The reason lies not in a legal necessity, but in economic considerations. Firstly, liability risks from the period of the tax unity persist, which are regularly transferred back to the seller within the framework of the SPA. Secondly, an ongoing tax unity makes it more difficult to clearly delineate the results until closing.

Furthermore, financial investors regularly prefer clear structures that are free of old entanglements. Therefore, dissolving the tax unity creates transparency and reduces complexity.

In practice, a short fiscal year is often introduced, the tax unity is terminated before closing, and a final profit and loss statement is prepared. The buyer takes over a clear structure without any outstanding profit transfer claims.

Practical tips for entrepreneurs

Anyone involved in a sales process with a tax unity should begin structural planning early. The timing of the termination of the tax unity is crucial and cannot be "fixed" in the short term.

Equally important is thorough documentation of profit transfers and loss offsets throughout the entire duration of the tax unity. This information is regularly subject to due diligence and forms the basis for determining the purchase price.

Buyers are advised to examine the history of the tax unity in detail. Incomplete or incorrect tax payments can have significant economic consequences.

Last but not least, a deep understanding of the purchase price mechanics is required. The allocation of results between seller and buyer is complex in existing tax unity analyzed in detail.

Conclusion: Master complexity instead of avoiding it

The tax unity is a powerful tax instrument, but it places particular demands on the sales process. Its complexity is manageable – provided it is integrated into the transaction planning early on and structured clearly.

Those who coordinate timing, documentation, and contractual arrangements can leverage the advantages of a tax unity while simultaneously controlling its risks. This is precisely the difference between a formally completed transaction and an economically successful one.