The Complete Guide for Swiss Entrepreneurs – Process, Costs, Taxes, and Practical Tips
If you started out as a sole proprietor in Switzerland, you already know the advantages of this legal form: no minimum capital requirement, minimal administrative overhead, and full control over your own business. But as success grows, many sole proprietorships reach their limits. At the latest when larger contracts come in, investors are needed, or personal liability becomes a risk, the question arises: Is it time to convert into a corporation (Aktiengesellschaft, or AG)?
This blog article explains step by step how the conversion of a sole proprietorship into an AG works in Switzerland, what legal and tax considerations you need to be aware of, and why this move pays off for many businesses.
Why Convert a Sole Proprietorship into an AG?
The decision to convert is a strategic milestone. Before you start the process, you should be clear about the most important reasons for making the switch.
Limited Liability – Protecting Your Personal Assets
As the owner of a sole proprietorship, you are personally liable with your entire private assets for all business debts and obligations. With an AG, by contrast, liability is generally limited to the company’s assets. This means your home, savings, and personal wealth remain protected in the event of financial difficulties. Especially as revenue increases and projects grow larger, this advantage becomes essential.
Capital Raising and Investor Friendliness
An AG offers the ability to raise external capital by issuing shares. Investors generally prefer corporations because the ownership structure is clearly defined and shares can be easily transferred. If your company needs growth capital or you want to bring business partners on board, the AG is the ideal legal form.
Professional Image and Credibility
In the Swiss business world, corporations enjoy a strong reputation. Clients, suppliers, and business partners often perceive an AG as more stable and professional than a sole proprietorship. Particularly in international business relationships or public tenders, the AG legal form can open doors that would otherwise remain closed to a sole proprietorship.
Tax Planning Opportunities
With a sole proprietorship, all profits are taxed as personal income. An AG offers significantly more flexibility: the company pays corporate tax, and you as the owner decide how much salary and dividends to distribute to yourself. Through a strategic combination of salary and dividends, the overall tax burden can often be optimized.
Succession Planning and Business Sale
A sole proprietorship is inseparably tied to its owner. Selling the business or arranging succession is therefore significantly more complicated. With an AG, shares can simply be transferred or sold, which simplifies both succession planning and a potential exit.
Sole Proprietorship vs. AG – Key Differences at a Glance
Before you decide to convert, it’s worth reviewing the key differences between the two legal forms:
| Criterion | Sole Proprietorship | AG (Corporation) |
| Liability | Unlimited (personal assets) | Limited to company assets |
| Minimum capital | None | CHF 100,000 (min. CHF 50,000 paid up) |
| Taxation | Profits taxed as personal income | Separate corporate and income tax |
| Ownership stakes | Not possible | Share transfers possible |
| Bookkeeping | Simplified up to CHF 500,000 revenue | Full double-entry bookkeeping required |
| Incorporation | Simple, no notary required | Notarization required |
| Social security | Self-employed | Employee (pension plan mandatory) |
| Company name | Must include owner’s surname | Freely chosen (with “AG” suffix) |
Legal Foundations of the Conversion
A common misconception: under Swiss law, a sole proprietorship cannot be directly “converted” into an AG. Technically, a new AG is incorporated that takes over the assets and liabilities of the existing sole proprietorship. The sole proprietorship is then deleted from the Commercial Register. This process is referred to as a transfer of assets (Vermögensübertragung) under the Swiss Merger Act (FusG).
There are two common methods for the transfer:
- Asset takeover (Sachübernahme): The newly incorporated AG takes over all assets, receivables, and liabilities of the sole proprietorship under an asset takeover agreement. In return, the former owner receives shares of the AG.
- Contribution in kind (Sacheinlage): Individual assets of the sole proprietorship are contributed to the AG as a capital contribution to pay up the share capital. A licensed auditor verifies the value of the contributed assets.
Both methods constitute what is known as a qualified incorporation, which involves higher legal requirements and costs compared to a simple cash incorporation. In practice, the asset takeover is the most commonly chosen method for Swiss SMEs.
Step-by-Step Guide: How to Convert Your Sole Proprietorship into an AG
The conversion process involves several clearly defined stages. Careful preparation is crucial to ensure the transition goes smoothly.
Step 1: Prepare the Conversion Balance Sheet
First, you need to prepare a financial closing for your sole proprietorship – the so-called conversion balance sheet. This balance sheet forms the basis for the entire transaction and must accurately list all assets and liabilities. Important: the assets must exceed the liabilities, meaning there must be a net asset surplus. The annual financial statements must not be older than six months; otherwise, interim financial statements must be prepared.
Step 2: Inventory and Valuation
Create a detailed inventory of all assets to be transferred to the AG. This includes machinery, vehicles, inventory stock, intangible assets such as trademarks, accounts receivable, and existing contracts. A licensed auditor will then review the valuation and confirm the value of the business.
Step 3: Incorporate the AG
In parallel with the preparation, the actual incorporation of the corporation takes place. This requires a minimum share capital of CHF 100,000, of which at least CHF 50,000 must be paid up at the time of incorporation. In the case of an asset takeover, the capital can be paid up by transferring business assets rather than cash. The incorporation is notarized and includes the articles of association, the election of the board of directors, and the appointment of the auditor.
Step 4: Execute the Asset Takeover Agreement
The asset takeover agreement specifies which assets and liabilities the new AG will assume from the sole proprietorship. In return, you receive shares of the AG. If real estate is also being transferred, the agreement must additionally be notarized. This agreement is the legal cornerstone of the conversion.
Step 5: Commercial Register Entry and Deletion
The new AG is filed with and entered into the Commercial Register. At the same time, the sole proprietorship is deleted, provided all assets have been transferred. If only a portion is transferred, the sole proprietorship may continue to exist. The registration is published in the Swiss Official Gazette of Commerce (SHAB).
Step 6: Update Insurance and Social Security
After the conversion, your social security status changes fundamentally. As the owner of an AG, you are considered an employee and must be enrolled in an occupational pension plan (BVG). Accident insurance (UVG) must also be obtained. Additionally, review your existing business insurance policies and adjust them to reflect the new corporate structure.
Optimal Timing for the Conversion
The ideal time for the conversion is the beginning of the year (January 1). The conversion balance sheet then corresponds to the annual financial statements that need to be prepared anyway, avoiding duplicate work and additional costs. Alternatively, the conversion can be carried out retroactively to the beginning of the year until the end of June. After June 30, a retroactive conversion is no longer possible – the effective date then falls on the date of incorporation.
Tax Considerations: Hidden Reserves and the Lock-Up Period
The tax implications of the conversion deserve particular attention. As a general rule, the hidden reserves of the sole proprietorship are not taxed upon conversion into an AG, provided two conditions are met. First, tax liability in Switzerland must continue, and second, the previously applicable book values must be carried over (Art. 19 para. 1 of the Federal Direct Tax Act, DBG).
However, there is an important restriction: a five-year lock-up period applies after the conversion. During this time, the shares may not be sold to third parties. If they are sold nonetheless, the hidden reserves transferred during the conversion will be taxed retroactively (Art. 19 para. 2 DBG). This lock-up period is a critical element of tax planning and should be factored into your strategic considerations.
Value Added Tax (VAT) Implications
The conversion effectively constitutes a purchase of the sole proprietorship by the newly incorporated AG. In principle, VAT would need to be charged on this transaction. In practice, however, a notification procedure (Meldeverfahren) can be applied, so that no actual VAT burden arises. Clarify this point with your tax advisor early on to avoid unpleasant surprises. Additionally, the new AG generally requires its own VAT registration number.
Overview of Conversion Costs
Converting a sole proprietorship into an AG involves higher costs than a simple cash incorporation, as it constitutes a qualified incorporation. You should budget for the following cost items:
- Notary fees for the public certification of the incorporation
- Commercial Register fees for registering the AG and deleting the sole proprietorship
- Auditor costs for reviewing the asset takeover or contribution in kind
- Costs for preparing the conversion balance sheet and inventory
- Advisory fees from fiduciaries or specialized incorporation service providers
- Applicable stamp duty on the share capital
Total costs vary depending on the complexity and scope of the sole proprietorship but typically range between CHF 3,000 and CHF 8,000. Specialized providers such as Startups.ch or Fasoon offer package prices that simplify the process and make costs transparent.
Common Mistakes and Pitfalls
To ensure your conversion goes smoothly, you should be aware of and avoid the following typical mistakes:
- Outdated balance sheet: The annual financial statements must be no more than six months old. Plan enough lead time to have interim financial statements prepared if necessary.
- Missing double-entry bookkeeping: A proper double-entry bookkeeping system is required for the asset takeover. Sole proprietorships that only maintain simplified accounts must switch beforehand.
- Violating the lock-up period: Anyone who sells shares within five years of the conversion risks retroactive taxation of the hidden reserves.
- Forgetting social security: The switch from self-employed status to employee status has implications for AHV, BVG, and UVG that must be addressed in a timely manner.
- Not clarifying VAT early enough: The notification procedure must be requested in time; otherwise, an unnecessary VAT burden may result.
Checklist: Are You Ready for the Conversion?
The following checklist helps you keep track and ensure all prerequisites are met:
- Double-entry bookkeeping maintained and current annual financial statements available
- Conversion balance sheet prepared (no older than 6 months)
- Inventory of assets to be transferred prepared
- Auditor appointed for the review
- Articles of association for the AG drafted
- Board of directors appointed (at least one member domiciled in Switzerland)
- Notary contacted for the public certification
- Tax implications discussed with fiduciary (hidden reserves, lock-up period, VAT)
- Social security and pension plan arranged for the AG
- Business insurance policies adjusted to the new legal form
Conclusion: The Conversion as a Strategic Growth Step
Converting a sole proprietorship into a corporation is more than an administrative act – it is a strategic decision that takes your business to the next level. With an AG, you protect your personal assets, open up new financing opportunities, benefit from tax advantages, and position your company professionally in the market.
The process requires careful preparation and collaboration with experienced professionals such as fiduciaries, auditors, and notaries. But the effort is well worth it: with the right planning, the conversion proceeds swiftly and without any unpleasant surprises.
If your sole proprietorship has grown in recent years and you are thinking long-term, the conversion into an AG is a logical and forward-looking step. Seek personalized advice and start the journey into the next phase of your business.
Disclaimer: This article is for general informational purposes only and does not constitute legal or tax advice. For advice tailored to your specific situation, please consult a qualified fiduciary, attorney, or tax advisor.
