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Closing Down a Business and Splitting a Business When Converting to a GmbH – Tax Traps for Founders

Many IT founders, game developers, and startups often begin as sole traders or in a small partnership (GbR). The formation of a GmbH is then a common next step, driven by the desire to limit personal liability, present a more professional image, or attract investors. However, converting an existing business into a GmbH is not merely a formality. It can involve significant tax pitfalls.

A primary risk is the tax-related discontinuation of the business (Section 16 of the German Income Tax Act (EStG)) or a so-called hidden business split. These can arise unnoticed if the new GmbH takes over the operational business completely. While these terms sound abstract, they present a very real risk for founders: a sudden tax burden on all previously untaxed hidden reserves – essentially, the increase in value of your company – without any actual cash flow.

In this comprehensive guide, we will examine in detail the circumstances under which a business discontinuation or split can occur during the formation of a GmbH. We will also discuss the severe tax consequences, such as the disclosure of hidden reserves and unbundling taxation, and how to avoid or mitigate these pitfalls through proactive structuring. Special attention will be paid to typical scenarios in the IT sector:

Liability vs. Taxes: Why Startups Switch to a GmbH

Before delving into tax complexities, let's briefly review the reasons for choosing a GmbH. As a sole proprietor, you bear full personal liability. A mistake, a damage claim, or high liabilities can quickly threaten your private assets. A GmbH, in contrast, offers limited liability. Generally, private assets are protected, and only the company's assets are liable.

Investors and business partners often require a professional legal form before entering into contracts or providing capital. Moreover, a GmbH can appear more reputable in business dealings. It also offers advantages in IP management in the software sector, where intellectual property can be transferred to and held by the company.

However, the transition to a GmbH inevitably creates a break between taxable entities. You move from a natural person (or partnership) to a corporation. For tax purposes, this transition is not automatically treated as a neutral change of legal form. Instead, the tax authorities have specific mechanisms to intervene.

Without careful structuring, the tax office could treat the process as if you had sold or given up your previous company. This could result in immediate taxation of all previously untaxed capital gains (hidden reserves). Such an outcome would be a severe blow for any founder, especially since the formation of the GmbH itself usually does not generate any cash flow for the company. On the contrary, you often establish a GmbH with minimal share capital, receiving little to no cash. Yet, for tax purposes, it might be treated as if you had realized profits that never reached your account.

The following sections will explain the central concepts of business closure and (hidden) business split in detail. We will also highlight typical scenarios and provide guidelines on how to avoid these pitfalls.

The Invisible Tax Trap: Closure of a Business (§ 16 EStG)

What Does "Cessation of Business" Mean for Tax Purposes?

Simply put, the cessation of a business refers to the complete termination of operations by an entrepreneur. The moment a sole trader ceases business (or a co-entrepreneur in a partnership gives up their share), the tax office demands payment. It seeks to tax the so-called abandonment profit. This profit includes the hidden reserves of all assets belonging to the business, which must be disclosed upon discontinuation.

In practical terms, the abandonment gain is calculated as the difference between the fair market value of all business assets and their book values, minus any liabilities and certain costs. This means any value added to your company (e.g., self-developed software, customer base, trademark rights, depreciated machinery) is realized for tax purposes at the time of business closure, even if you haven't actually sold these assets.

The tax consequences of giving up a business are considerable. The entire hidden reserve potential is suddenly revealed and subject to income tax. For many founders, this means income taxation at the highest tax rate on a fictitious profit. While some concessions exist, such as a one-off tax-free allowance of €45,000 for entrepreneurs over 55 or in cases of permanent occupational disability, and reduced taxation (Section 34 EStG) under certain conditions, most startup founders are young and cannot utilize these benefits.

They are fully taxed on the profit they give up, in addition to their current profit. Trade tax can also be an issue, although for natural persons, it is at least proportionately offset against income tax up to a certain assessment rate. In short, giving up a business can result in an enormous tax burden.

Business Closure vs. Business Interruption – And Why the Distinction Is Important

It's crucial to understand that not every break in operations constitutes a cessation of business. It is possible to let a business lie dormant or lease it out without immediately terminating it for tax purposes (more on the lessor's option later). A genuine cessation of business only occurs when the entrepreneur definitively removes all essential business assets, sells them, or transfers them to private assets, and ceases commercial activity.

In practice, this is often achieved by selling or liquidating the business. When converting to a GmbH, however, it is often unclear whether a cessation has already occurred or if it's merely a temporary interruption or continuation in another form. This is precisely the crux: if the transfer to a GmbH is deemed a cessation of operations, the hidden reserves are disclosed. In the worst case, this happens at a time when the founder has no liquidity at all to pay the taxes.

In the case of a business disposal (sale of the entire business), the situation is clear: the sale price minus the book value equals the capital gain, which is taxed similarly to a discontinuation gain. If a business is given up without being sold, an abandonment balance sheet is prepared, valuing all remaining assets at their partial market value. For example, if a business asset is transferred to private assets, its market value is recognized as a fictitious sale.

Consider this typical example: As a sole trader, you have self-developed software that has a book value of practically €0 on your balance sheet because self-created goodwill cannot be capitalized. If you give up the business and do not transfer this software to new business assets but "keep" it, the tax office will recognize a market value for it, potentially based on future earnings prospects. This increase in value would be part of the profit on disposal. While self-created goodwill is generally not considered for tax purposes upon business abandonment unless sold for a fee, it becomes relevant as soon as you realize it – for instance, by the GmbH providing you with shares or money in return. We will elaborate on this shortly.

Key Point: The formation of a GmbH can be considered a discontinuation of a business if you de facto close your previous business. This is especially problematic if there are high hidden reserves, often in intangible assets such as software or user data. This scenario leads to a high tax burden without any actual profit inflow. However, as we will see, this can be prevented through clever structuring.

Complete Transfer to the GmbH – When Does a Business Cease to Exist for Tax Purposes?

Imagine you are a sole trader who has built a thriving software platform. You then establish a limited liability company, holding a 100% stake, and transfer the entire business to this GmbH. From this point on, your sole proprietorship is no longer active, and you might even deregister it with the trade office. From your perspective, you have simply changed the legal form. However, from the tax office's perspective, you may have given up your business and "transferred" it to the GmbH, thereby realizing a discontinued profit.

Whether a business has been discontinued depends on the specific circumstances. A complete transfer of all essential business assets to another legal entity, such as a GmbH, can be considered a discontinuation of the previous business. The decisive factor is whether or not you receive company rights (shares) in return.

If the business is simply transferred to the GmbH free of charge, without the GmbH granting new shares (e.g., because you already owned the GmbH alone), courts may consider this a discontinuation of the business for tax purposes. The rationale is that any increase in value of GmbH shares you already owned does not count as consideration within the meaning of the Income Tax Act. It is then treated as if you had transferred your business for nothing, which, from a tax perspective, is equivalent to a withdrawal of all assets. Consequently, the GmbH must recognize the transferred assets at their going concern value (market value), the continuation of the book value is denied, and you are deemed to have sold or abandoned the business with all hidden reserves.

A practical example of this was provided by a ruling of the Baden-Württemberg tax court: A son founded a GmbH via a cash capital contribution. Later, his father transferred his retail business to the son free of charge as an anticipated succession. The son then contributed this business to "his" GmbH as a hidden contribution, without receiving new shares. Both the tax office and the tax court viewed this as a business discontinuation under Section 16 (3) EStG, requiring all hidden reserves to be disclosed. The GmbH was not allowed to continue at book value but had to recognize the acquired goods at market value, leading to a correspondingly high discontinuation profit for the son. The error here was the failure to grant new GmbH shares for the contributed business; the increase in value of his existing shares did not count as consideration.

Note: If you intend to transfer your business to a GmbH without incurring tax, this cannot be done informally. A transfer without consideration or solely against a credit to the capital reserve is considered a total withdrawal and abandonment for tax purposes. All hidden reserves would be immediately taxable, a potentially disastrous outcome for a founder who may not have generated any profit but merely changed legal form.

Fortunately, this can be avoided. In the section on structuring measures, we explain how such a transfer can be made tax-neutral (keyword: Section 20 of the German Reorganization Tax Act). The key is that you generally must receive new company shares for the contribution and meet certain requirements to prevent the tax office from treating the transaction as an abandonment. More on this shortly, but for now, remember:

Tip: Even if you later decide to let your sole proprietorship lie dormant or liquidate it informally after the transfer, you should not make this decision thoughtlessly, as it would formalize the business closure. It is better to initially choose a structure that avoids a fictitious discontinuation, for example, by temporarily leasing the sole proprietorship to the GmbH, which we will discuss later. This ensures the old business continues to exist for tax purposes, allowing you to keep the hidden reserves "frozen" for the time being.

Let's now consider the second important concept that often appears in parallel with the formation of a GmbH, sometimes unintentionally: the (hidden) business split.

Hidden Business Split: When the Old Company Lives On in the Background

What Is a Business Split?

The business split is a concept developed by case law in German tax law. It occurs when a company is divided into two parts: a holding company (which holds important assets and rents or leases them out) and an operating company (which conducts the operational business). This typically happens when an entrepreneur owns a GmbH (operating GmbH) and simultaneously holds a property or machinery in their private assets or in a sole proprietorship, which they then transfer to the GmbH for use.

Two conditions must be met: personal interdependence (the same controlling party on both sides) and material interdependence (the transfer of an essential business asset to the operating GmbH). As soon as the same individuals can assert their will in both companies, and at least one essential business asset is transferred from the holding company to the operating company, a (tax) business split is recognized.

Important: Not only land or machinery can be considered an essential business asset. Any asset that is of central functional importance for the operating company, such as licenses, software, patents, or an entire customer base, can qualify. For IT companies, intellectual property (source code, platform) or a critical domain can represent an essential operating basis. If the founder transfers these to their company, material interdependence exists. If the founder is also the controlling shareholder of the GmbH, personal interdependence also exists. Consequently, a business split occurs, even if it was not consciously planned, leading to a "hidden" business split.

Tax Consequences of a (Hidden) Business Split

Why is this business split relevant? Because it means the previously supposedly "private" owner company (e.g., your sole proprietorship or GbR, now holding only one asset) continues to be regarded as a commercial enterprise for tax purposes. All income from the owning company, typically rental or leasing income from the transfer, is reclassified as commercial income (Section 15 (1) no. 2 EStG).

The owning company therefore does not become a "normal" landlord with income from letting or leasing. Instead, it remains a commercial enterprise for tax purposes. This implies that the transferred assets remain business assets of the owning company. Crucially, the shares in the operating GmbH also necessarily become part of the business assets of the owning company! This often overlooked consequence has far-reaching implications.

As long as the business split is intact, this may not pose a problem. Both parts are treated as interlinked for tax purposes (the profit of the owner company from rental is subject to trade tax, but allowances and credits may apply, and the GmbH shares are part of the business assets). However, if the business split breaks up, there is a risk of a tax explosion. The termination of a business split – for example, because the personal interdependence ceases or the essential operating basis is no longer transferred – regularly leads to the owning company giving up its business.

At that moment, the owning company would have to transfer its GmbH shares and the transferred assets to private assets (a compulsory withdrawal). This, in turn, triggers the disclosure of all hidden reserves in these assets and shares. In other words, the dissolution of a business split has the same consequences as the discontinuation of a business, but in this case, there's a double charge, e.g., on the hidden reserve of the property and on the GmbH shares previously held as business assets.

The fatal aspect is that the dissolution of a business split often happens unintentionally. For example, when parts are sold or transferred without considering the interdependence. If, for instance, the entrepreneur only sells the GmbH (operating company) to a third party but retains the GmbH or sole proprietorship with the property (perhaps as a retirement provision), the personal interdependence is broken. There is no longer a business split. Result: The property is deemed to have been removed from business assets, and its hidden reserves are taxed, even though the entrepreneur has not sold the property. They may have to pay substantial taxes without receiving a single euro for it.

The same applies if the property is sold but the GmbH shares remain. The GmbH shares would then become private assets, and their hidden reserves would be taxed, even though the shares were not sold. Even a gratuitous transfer of GmbH shares (e.g., to the next generation) can end the business split, resulting in a compulsory withdrawal of both the shares and the remaining assets.

In short: a business split "sticks" to the company structures and makes exiting expensive. What is often deliberately used as an arrangement (separation of real estate ownership and operations for liability protection) can become a tax trap when it ends unexpectedly. In our startup context, a business split is often "hidden" if the founder establishes a GmbH but deliberately does not transfer certain assets to it, keeping them privately and only making them available for use by the GmbH.

Example: A solo developer, Max, has developed an online game as a sole trader. The software and server belong to him personally. He now founds "Max Games GmbH" and operates the platform to limit liability. The GmbH needs the software and server. Max provides them to the GmbH free of charge (or for a small fee) under a license agreement. Max holds 100% of the GmbH shares. Result: Max's sole proprietorship is now an owner-operated business that transfers essential operating assets (software, server) to his operating company (the GmbH). There is personal interdependence (Max alone controls both) and material interdependence (software/servers are essential for business operations).

A business split exists, even if Max did not plan it that way. For tax purposes, Max's sole proprietorship is considered a continuing business; the software and the server remain his business assets, as do (surprisingly) Max's GmbH shares.

As long as Max retains control, this goes unnoticed. But now an investor wants to buy into Max Games GmbH and demands 60% of the shares. Max agrees and sells 60% of his GmbH shares to the investor. At this point, the personal interdependence ceases. Max can no longer assert his will alone in the GmbH, as the investor holds the majority. The business split thus ends abruptly. Consequently, Max's sole proprietorship must transfer the remaining 40% of GmbH shares to private assets, along with the software and server, as these were either also transferred or are no longer used in a demerger constellation.

All these withdrawals trigger tax: The increase in value of the software (difference between book value and market value), the server, and even Max's GmbH shares are now realized. The GmbH shares suddenly have a specific market value due to the investor's entry (what the investor paid allows conclusions to be drawn). These hidden reserves are taxed for Max, even though he has only sold part of them. This can lead to a considerable tax payment that Max has to make from the proceeds of the sale. If Max had made a gift or issued shares as part of a capital increase, it would be even worse, as there would be no cash inflow, but tax would still be due.

The example illustrates that a hidden business split can be extremely dangerous for founders if the ownership and operating sides are later separated. Many startups eventually bring in investors or change ownership structures, and this is precisely when the trap strikes if you are in a business split without realizing it. Taking on investors in a startup requires careful planning.

Recognizing and Avoiding Business Splits

As a founder, you should ask yourself: Do I still possess significant assets outside the GmbH that I am making available to the GmbH after its formation? If so, check these criteria: Do you (or you together with allied shareholders) still hold a majority stake in the GmbH? Is the property provided essential for the business operations? If both apply, you are likely in a (intentional or unintentional) business split.

This isn't inherently negative; some structures are deliberately chosen this way, for example, to separate real estate from the operating business. However, you must be aware of the consequences. In our context, it often means you have temporarily avoided giving up your business by continuing to exist as an owner-operated company. The tax office allows you to continue operating commercially, preventing the immediate disclosure of hidden reserves. Nevertheless, you are now in a structure that requires careful management to avoid unpleasant surprises later on.

Any change – be it a sale of shares, an alteration in the transfer of use, or the discontinuation of the owner company – can still bring the hidden reserves to light. There are ways to mitigate or avoid this (e.g., in the example, the software could be transferred to the GmbH before the sale of shares to shift the disclosure, or a different legal form could be established for the owning company from the outset, as discussed below). All of this, however, requires early planning.

If you have deliberately chosen to split a business (e.g., to avoid immediate tax when setting up a GmbH by keeping certain assets separate), you should think long-term. How will you exit this interlocking structure later? In family businesses, various methods exist, such as establishing an intermediate company (GmbH & Co. KG) to hold real estate, allowing for book value transfers if the demerger no longer applies. For startups, it might be sensible to transfer the property to a partnership or to a GmbH in good time before an investor arrives. Contractual precautions, such as agreeing on a reservation of tax rescission in participation agreements if a certain structure (like a demerger) would otherwise have negative consequences, can also be taken.

However, these points vary greatly case by case. The safest way to avoid unwanted business splits is to transfer all key operating assets to the GmbH from the outset instead of retaining them privately. If this isn't done for certain reasons, you should recognize the situation as a demerger case and seek tax guidance.

Hidden Reserves and Unwinding Taxation – What Happens When Transferring to a GmbH

We've talked extensively about hidden reserves. But what does this specifically mean for an IT startup? Hidden reserves are essentially increases in value embedded in your company's assets that have not yet been taxed. Typical examples for a developer startup include:

If you are now pondering, "Right, I have all this – what happens to it when I set up a GmbH?" – then you are on the correct path. These hidden reserves can become taxable if the transition is structured incorrectly.

Entstrickungsbesteuerung – a complex term, but it describes the core principle: Whenever assets are withdrawn from domestic taxation, the hidden reserves contained within them must be disclosed (known as unbundling). In the simplest case, this means that if something is removed from the business assets, it is treated as if it had been sold at market value. In the event of a business discontinuation, we saw this exact mechanism – total removal of all assets into the private sphere equals unbundling of all assets and taxation of the profit from discontinuation. We also saw that the termination of a business split results in such an unbundling (compulsory transfer to private assets).

A similar principle applies when transferring to a GmbH environment. If an asset is transferred to a GmbH (which is a separate taxable entity), there is a risk of it being removed from your previous business assets, unless you manage to apply for or qualify for tax neutrality. This is precisely what the German Reorganization Tax Act (UmwStG) makes possible in certain cases. Without these auxiliary constructions, any transfer of, for example, software from your sole proprietorship to the GmbH would be treated as if you had sold or withdrawn the software at market value, resulting in immediate income taxation.

Even more insidious: Even if you do nothing, for instance, not officially selling your platform to the GmbH but simply allowing the GmbH to use it free of charge, this cannot remain without tax consequences. Either, as described above, a business split occurs, meaning the platform remains in your ownership (no tax exemption for now, but a later risk), or (if no business split applies, perhaps because you do not control the GmbH) the tax office could argue that you have removed the platform from your business assets and transferred it free of charge. This would be a withdrawal (private withdrawal), also valued at market value and taxed accordingly.

Intangible values are particularly critical here. Simply using your software in the GmbH without consideration or clarification could be considered a hidden contribution. This is a contribution that leads to a withdrawal due to a lack of formalities, as happened in the case described with the father-son business contribution. A partially paid transfer (e.g., the GmbH pays you a symbolic €1 for the platform) would also be divided into a paid and a free part; the free part is considered a withdrawal at partial value.

In short: When transferring your business to the GmbH, you need to address the issue of hidden reserves. You either deliberately tax the hidden reserves (if they are small or you accept this), or you choose structures that allow for temporary tax neutrality. The following sections outline the possible options. It's crucial to realize that an unstructured transfer will lead to tax implications either now or later. There is no "free ride" in changing legal form without tax, unless special rules are applied.

Before moving on to solutions, a word on international aspects: The term "Entstrickungsbesteuerung" is also frequently used in connection with cross-border transactions. For example, if a company is relocated abroad, Germany requires exit taxation on hidden reserves (see Section 4 (1) sentence 3 EStG, Section 6 AStG). While this is often not directly relevant for founders, the principle is analogous. If you consider transferring your IP to a foreign company, even stricter unbundling rules apply. In Germany, however, the UmwStG at least provides tools to mitigate the transfer to a GmbH.

Conclusion of this part: Hidden reserves in your startup can be considerable – don't underestimate them. Think of prominent examples: A programmer who works for years on a game creates an intangible asset that can be worth millions. This remains untaxed until a triggering event occurs. The formation of a GmbH can be such an event, but it doesn't have to be if you plan it correctly.

Options for Structuring: How to Achieve a Tax-Neutral or Tax-Optimized GmbH Conversion

After all the pitfalls, the question arises: How can founders convert their sole proprietorship or GbR into a GmbH without falling into the tax trap? Fortunately, there are proven ways to avoid or at least minimize the risks described above. Here are the most important strategies:

1. Founding the GmbH in Good Time (Timing of Conversion)

Timing is crucial. The earlier you plan to become a GmbH, the lower the hidden reserves that have accumulated by then. Many founders delay the conversion until the business is flourishing, but by then, considerable value has already been created (goodwill, IP, customer base).

Incorporating early means you might be able to switch to a GmbH before major value increases. This could result in no taxation at all, if no significant hidden reserves exist, or manageable taxable amounts. For example, a game developer might complete the first beta version of their game with few users and minimal sales. The company's value is primarily based on the idea and some code, difficult to quantify externally. If they were to form a GmbH at this stage and contribute the project, the partial value (market value) of the contributed business would likely still be low, possibly near zero. Even if minor hidden reserves were taxed, the burden would be minimal.

However, one year later, after launch and with 100,000 users, the goodwill could be immense. The transition would then be much more expensive or only feasible with conversion tax neutrality, and thus with lock-up periods. Of course, you must weigh the costs and disadvantages against early incorporation. A GmbH involves some effort and fixed costs. Nevertheless, if you foresee the project scaling, you should consider not remaining in "tax limbo" for too long. A UG (haftungsbeschränkt), the mini-GmbH, can also be an interim solution, but this makes no difference regarding conversion tax, as a change of legal form also occurs here (the UG is already a corporation). This choice is more about liability and capital costs.

Remember: Early change equals lower hidden reserves, which equals lower risk. But sometimes, value appreciation has already occurred before you decide on the GmbH. In such cases, other measures are needed.

2. Conversion According to the German Reorganization Tax Act (§ 20 UmwStG): Contribution in Kind in Exchange for New Shares

The ideal way for a tax-neutral transfer is to transfer your sole proprietorship or GbR to a GmbH in accordance with Section 20 UmwStG. This paragraph allows, under certain conditions, a business, part of a business, or co-entrepreneurial share to be transferred to a corporation (e.g., GmbH) at book value. This means that the hidden reserves do not initially have to be taxed; the GmbH continues the book values as if nothing had changed for tax purposes. The highlight: In return, you receive new shares in the GmbH (a so-called contribution in kind in exchange for company rights). This precisely distinguishes this variant from the taxable case described earlier, as here there is formally correct consideration in the form of GmbH shares, which enables tax neutrality.

Most important requirements for § 20 UmwStG:

The contribution in accordance with Section 20 UmwStG is the preferred method if significant hidden reserves exist and you desire a clean transition to a GmbH. Example: Anna, a developer, ran a successful app as a sole trader. Her balance sheet shows little equity, but the app has a de facto market value of €500,000 (based on turnover, user numbers, etc.). She wants to establish Anna-App GmbH. If she simply forms the GmbH and transfers the app, she would have to pay tax on €500,000 in profits, which would be disastrous. Instead, she consults her tax advisor for a contribution. Anna-App GmbH is founded with €25,000 share capital, and Anna subscribes for all shares. Concurrently, she enters a contribution agreement to contribute her individual business "app development," including all rights, databases, user contracts, etc., to the GmbH. In return, the GmbH grants a capital increase of, for example, €1 share capital plus a premium of €499,999 (or the share capital is increased accordingly, which would be more complex as valuation reports are required; the premium model partially avoids valuation hurdles). For tax purposes, Anna declares the contribution at book value and applies for book value recognition. Result: No immediate taxation. The €500,000 hidden reserves are "locked up" in the GmbH. However, Anna must wait at least seven years after the contribution before selling shares, otherwise, retroactive taxation risks apply.

Even after a successful book value transfer, be careful with the conditions! If, during a subsequent tax audit, the tax office discovers that the conditions were not met (e.g., an entire business was not transferred, or a formality was missing), it can reject the book value approach. Taxation would then be levied retroactively, with interest. Such errors occur, for example, if an important asset is inadvertently omitted (e.g., all customer contracts are transferred, but the essential domain is not), or if a sole trader attempts conversion via a change of legal form. A registered trader can change legal form under the UmwG, but if no new shares are created in the process, Section 20 UmwStG does not apply. A clean structure is also essential for a GbR: all shareholders must contribute their shares proportionately to receive new GmbH shares. Alternatively, the German Reorganization Act can be used (e.g., the spin-off of a partnership into a GmbH), which can also be tax-neutral but imposes the same requirements on the transferred business.

For most founders, Section 20 UmwStG is likely the most viable option if you already have an ongoing, valuable business. However, be mindful of the practical effort: it is a notarial process (non-cash formation or capital increase usually requires a non-cash formation report or valuation), and experienced tax advisors should be involved to ensure the plausibility of values. You cannot simply invent a fantasy value to save on share capital; the values must be accurate to avoid issues with the registry court or tax office later.

3. Leasing the Business Instead of Giving Up the Business (Lessor's Option)

Suppose you do not wish to (or cannot) pursue the step in accordance with Section 20 UmwStG, perhaps due to its time-consuming nature or perceived uncertainties. An alternative strategy could be to initially continue the business, but in a different form: by leasing the entire business to the GmbH.

The so-called lessor's option allows a trader who leases out their business as a whole to still be treated for tax purposes as if the business were continuing, provided they do not expressly declare giving up the business. In concrete terms: you, as a sole trader, enter into a lease or usage agreement with your newly founded GmbH, encompassing all essential operating assets – ultimately the entire business. From now on, the GmbH manages daily operations and pays you a monthly rent, for example.

You do not deregister the business or declare its abandonment to the tax office; instead, you exercise the lessor's option. Consequently, the income from the lease continues to count as your commercial income, and your business remains operational for tax purposes, albeit in "retirement" or leased out. There is no immediate taxation of hidden reserves – no abandonment balance sheet, no abandonment profit taxation. Taxation only occurs when you actively declare the cessation of your business at some point (or actually sell all main assets).

This sounds ideal initially, as it elegantly avoids immediate business cessation. However, there are a few caveats:

In practical terms, the lessor model is useful for gaining time. It prevents immediate taxation upon GmbH formation. It is relatively simple to set up: a lease agreement and a letter to the tax office stating, "I hereby declare that I am not giving up my business, but exercising the lessor option." This provides temporary tax relief. However, you then operate with a rather complex double structure: your GmbH and a "dormant" sole proprietorship (or partnership) that may need to submit annual tax returns (profit from business operations, even if only consisting of rent). Additionally, if applicable, you must consider the implications of splitting the business (e.g., your GmbH share is part of the owner company's business assets, which becomes relevant upon sale).

Example continued: Max, our platform developer, decides to found "Max Online GmbH" in 2025 but retains his platform as a sole proprietorship, leasing it to the GmbH for an annual license fee. He does not declare abandonment to the tax office. Result: His sole proprietorship generates, for instance, €30,000 in rental income annually, classified as income from business operations. There is no trade tax because nothing remains after offsetting. Max's GmbH can deduct the €30,000 as a business expense. This continues for a few years. In 2028, an investor wants to buy 60% of the GmbH shares. Caution: This ends the personal interdependence. Formally, it would terminate the business split. However, Max can now decide: he has never declared abandonment. According to the BFH, he may continue exercising his lessor's option despite the discontinuation of personal interdependence. His sole proprietorship then receives rent from a GmbH where he is no longer the majority shareholder; this constitutes a "normal" business lease (no more demerger, as there's no control identity). He could therefore continue his business even after selling shares and only declare termination later (e.g., when selling the remaining 40% or when the contract expires).

He would then pay tax on the discontinuation gain, but by then, he might be 55 years old and eligible for the tax-free allowance, or the platform might have lost value, or he could still contribute the platform to the company. He gains flexibility. Of course, he would need to clarify with the investor whether the platform should remain leased or if the GmbH should acquire it outright, which would be a new taxable transaction. As you can see, coordination becomes complex, but from a tax perspective, Max can control when he realizes the reserves.

Conclusion on the lessor's option: This is a valuable option for achieving tax deferral. It is particularly suitable for founders who do not wish to or cannot pay tax on immediate value appreciation, and who also do not yet have the prerequisites or desire for the major conversion tax solution. However, it should only ever be an interim solution, not a permanent one without an exit plan.

4. Transfer of Software, User Data, IP – Note Special Features

In the IT sector, a company's core values often comprise intangible assets. Transferring these from an individual to a limited liability company raises not only tax issues but also legal and data protection concerns. Here is an overview of what to consider:

Essentially, you should transfer everything of value or operational necessity in writing. Estimate values realistically and treat yourself and the GmbH as if you were third parties, even if you are the sole shareholder, because the tax office will take this exact view (keyword: arm's length comparison). Proper documentation helps prevent future conflicts. If you deliberately withhold certain IP (e.g., due to uncertainty about the GmbH's success and a desire to maintain flexibility), be aware of the consequences discussed above (business split, etc.) and plan for them.

5. Contract Design: Transfer Agreement, Lease, Asset Deal – Which Way Is Right?

Let's compare and classify the possible contractual constructions again, depending on your situation:

To summarize:

Early Protection and Planning for Founders

A clear recommendation from practice is: Seek tax and legal advice early on if you are planning to switch to a GmbH. Many problems can be avoided through anticipatory structuring. Here is some final advice on how founders can protect themselves to avoid future issues:

Ultimately, each case requires individual consideration. A seemingly trivial change, such as your spouse joining as a co-partner in the owner's GbR or the exchange of a leased asset, can significantly impact the structure. Therefore, comprehensive planning with a tax advisor and lawyer offers the best protection.

Conclusion: Successfully Converting to a GmbH – No Problem With Planning

Converting a sole proprietorship or a GbR into a GmbH in Germany is not rocket science, but it requires thorough preparation. For founders, startups, and IT entrepreneurs, this primarily means understanding the tax and legal pitfalls. An ill-considered transfer can be deemed a discontinuation of operations, revealing all of your young company's hidden reserves – a risk that can jeopardize livelihoods. A hidden business split can also occur if assets are retained, leading to unwanted tax consequences later when the interlinking ends.

Every founder planning a GmbH should be familiar with the terms "discontinuation of operations" and "business split," as these are critical points where the tax office will scrutinize. Fortunately, proven strategies exist for making the transfer tax-neutral or at least tax-optimized. The contribution pursuant to Section 20 UmwStG allows for a book value transfer in exchange for shares, enabling the postponement of the tax burden to the future (and potentially avoiding it entirely if shares are sold after the lock-up period). The lessor's option allows the old business to continue, thus avoiding immediate disclosure of hidden reserves, albeit at the cost of a more complex structure.

It is also crucial to regulate all IP and data transfers cleanly and legally – alongside tax considerations, there are also legal pitfalls concerning data protection and contract law. With sound advice, these points can be mastered. A practical tip: always think from the perspective of the tax office. Ask yourself: "What does it look like from the outside? Have I taken something, given something away, transferred something too cheaply? Does my story add up?" If you can answer these questions conclusively and your documentation is correct, you are more likely to be understood.

Quotes from case law demonstrate that courts are quite understanding of constructive transfers, provided the rules are followed. For example, the BFH emphasized that a contribution can be tax-neutral even if made as a share premium, while in another case, it clarified that a transfer without genuine consideration is considered a cessation of business. These guidelines provide a clear path.

In conclusion, for many startups, becoming a GmbH is the right and important step towards growth and success. Do not be discouraged by the tax stumbling blocks. With forward-looking planning and competent support, you can defuse the pitfalls. Then, in a few years, your blog post may even serve as a testimonial from a founder who confidently managed this transition, rather than a cautionary tale. With this in mind: good luck with the planning – it's worth it, because when you have the closure and splitting of a business under control, you can concentrate on what truly matters: the growth of your business.