When and why to convert from sole proprietorship to GmbH
The sole proprietorship (Einzelunternehmen) is the simplest and most common legal form in Switzerland: no minimum capital, optional Commercial Register (CR) entry below CHF 100,000 annual turnover, and simplified bookkeeping. But as the business grows, the limitations become clear: unlimited personal liability, inability to take on partners, and a potentially unfavourable tax burden.
The GmbH (Gesellschaft mit beschränkter Haftung, known as Sagl in Italian/French) is the most popular corporate form for growing Swiss SMEs. With a minimum capital of CHF 20,000 and separation between personal and business assets, it offers protection, flexibility and credibility with banks, clients and suppliers. The governing legislation is the Swiss Code of Obligations (CO), art. 772–827.
This guide analyses when it makes sense to convert, how to handle the legal procedure, the tax differences between the two forms, and — most importantly — how to maintain accounting continuity during the transition with software that grows with you, from sole proprietorship to GmbH, without data loss.
5 signs it's time to convert
There is no single threshold, but recurring indicators suggest that the sole proprietorship has reached its limits and a GmbH would be more appropriate:
Revenue exceeding CHF 500,000
Above this threshold, Commercial Register registration is mandatory anyway (art. 36 para. 1 CREO), and the sole proprietorship's tax burden tends to become less favourable. AHV/IV/EO contributions on net profit increase progressively, and the overall savings achievable with a GmbH can be significant.
Need to bring in partners or key employees
A sole proprietorship is by definition a one-person operation. If you want to involve a partner, transfer shares, or create a participation plan for strategic employees, the GmbH (or AG) is the only option. GmbH shares are freely structurable (art. 774 CO).
Concern about unlimited liability
With a sole proprietorship you are personally liable with all your private assets — home, savings, pillar 3a — for business debts. A single lawsuit or insolvent client can put years of work at risk. In a GmbH, liability is limited to the paid-in share capital.
Desire to optimise the tax burden
Above a certain profit level, the combination of corporate profit tax + tax on distributed dividends is lower than direct taxation of the sole proprietor's profit + AHV contributions. A fiduciary can calculate the exact breakeven point for your canton.
Investor interest or bank credit applications
Banks and investors prefer dealing with a legal entity: separate balance sheet, clear asset structure, defined governance. A GmbH conveys solidity and facilitates access to credit and financing.
Unlimited liability: the real risks
The fundamental difference between a sole proprietorship and a GmbH is the liability regime. Understanding the actual risks helps you decide whether the GmbH's protection is necessary for your situation:
Personal assets exposed
In a sole proprietorship there is no legal separation between business and private assets. Business creditors can claim personal accounts, real estate, vehicles and any other asset of the owner — including those co-owned with a spouse under the participation in acquisitions regime.
Commercial debts and leasing
Leasing contracts, commercial rents, supplier orders: in a liquidity crisis, the sole proprietor is personally liable for every obligation incurred. In a GmbH, once the capital is paid in, personal liability ceases (except for voluntary personal guarantees).
Third-party damage liability
If the business causes damage to clients or third parties (defective products, professional errors, delays with penalties), civil liability directly affects the owner's personal assets. Professional liability insurance mitigates the risk but does not cover all cases.
Consequences in case of bankruptcy
The bankruptcy of a sole proprietorship is the personal bankruptcy of the owner, with all consequences: entry in the Debt Collection and Bankruptcy Register, inability to obtain credit, impact on private life. The bankruptcy of a GmbH does not automatically entail personal bankruptcy of the shareholders.
Real case: a craftsman operating as a sole proprietor lost his home following a commercial dispute for CHF 180,000. With a GmbH, the loss would have been limited to the share capital of CHF 20,000 and any receivables from the company. The legal form is not a detail — it is a strategic asset protection decision.
Legal procedure: from sole proprietorship to GmbH in 6 steps
The conversion is not a simple CR amendment: it requires establishing a new legal entity and transferring the business. Here are the key steps under the CO (art. 69 ff for merger/conversion and art. 777 ff for GmbH incorporation):
Assessment and planning
Analyse the current situation with a fiduciary: balance sheet of the sole proprietorship, valuation of assets (including goodwill, receivables, inventory), liabilities and ongoing contracts. Define the structure of the future GmbH: shareholders, shares, capital. Determine the optimal tax timing (usually at year-end).
Drafting the articles of incorporation (notary)
GmbH incorporation requires a public deed drafted by a notary (art. 777 CO). The deed defines: company name, registered office, purpose, share capital (minimum CHF 20,000), shareholder quotas, governing bodies and management rules. The contribution can be in cash or through a contribution in kind (the sole proprietorship's business).
Payment of share capital
The minimum capital of CHF 20,000 must be fully paid up at the time of incorporation (art. 777c CO). In case of a contribution in kind (business transfer), an audit by a licensed auditor is required to certify the value of the contributed assets (art. 777c para. 2 CO).
Commercial Register entry
The notary submits the deed to the competent CR office. The GmbH acquires legal personality upon registration (art. 779 CO). Simultaneously, the deletion of the sole proprietorship from the CR should be requested (if registered). Average processing time: 5–15 business days depending on the canton.
Transfer of assets and contracts
All contracts (leasing, rents, suppliers, clients, insurance) must be transferred to the new GmbH. Some contracts require counterparty consent. Employment relationships with employees transfer automatically by law (art. 333 CO). Update bank details, insurance policies and VAT registration with the FTA.
Accounting update and tax compliance
Close the sole proprietorship's accounting at the transfer date. Open the GmbH's accounting with opening balances corresponding to the contributed assets and liabilities. Notify the FTA (VAT), the AHV compensation fund and the cantonal tax authority of the change in legal form. The VAT number can be transferred to the new entity.
Tax implications: sole proprietorship vs GmbH
The choice of legal form has a direct impact on overall tax pressure. Here is a comparison of the main differences:
| Tax aspect | Sole proprietorship | GmbH (Sagl) |
|---|---|---|
| Income / profit tax | Net profit is taxed as the owner's personal income (progressive rate, up to 40%+ depending on canton and total income) | Company profit is taxed at the corporate profit rate (effective rate 12–18% depending on canton). The manager's personal income is taxed separately |
| Social contributions (AHV/IV/EO) | AHV/IV/EO contributions calculated on entire net business profit (rate ~10% up to the maximum cap). The burden increases linearly with profit | AHV contributions only on the manager's salary (not on undistributed profits). Opportunity to optimise the salary/dividend mix to reduce overall contributions |
| Dividends | Not applicable: all profit is taxed as the owner's income — the dividend concept does not exist | Distributed dividends are taxed at 70% of value (partial taxation, art. 20 para. 1bis DFTA) if the holding is ≥ 10%. Economic double taxation is mitigated |
| Reserves and self-financing | Retained profit remains in the personal estate and is taxed as income regardless. No advantage to retaining profits in the business | Undistributed profits remain in the company and are only taxed at the corporate profit rate. Ability to accumulate reserves for investment at a lower rate |
| Capital gains on sale | Capital gains on the sale of the business (goodwill) are taxed as ordinary income + AHV contributions. Potentially very high tax burden | Sale of shares by an individual is tax-exempt (private capital gain on participations, art. 16 para. 3 DFTA). Decisive advantage for exit planning |
Accounting continuity during the transition
One of the most critical aspects of switching from a sole proprietorship to a GmbH is ensuring accounting data continuity. Errors at this stage can cause tax and audit problems for years:
Synchronised closing and opening
The sole proprietorship's accounting must be closed at the exact transfer date and the GmbH's accounting opened with corresponding opening balances. There must be no time gaps or discrepancies between the two balance sheets. AccountEX manages this transition automatically.
Consistent chart of accounts
The GmbH's chart of accounts must be compatible with the one used by the sole proprietorship to ensure historical data comparability. AccountEX uses the standardised Swiss chart of accounts (Kontenrahmen KMU) and allows the same structure to be maintained during the transition.
Invoice and document history
All invoices issued and received, contracts and documents from the sole proprietorship must remain accessible and linked to accounting entries even after the transition. The 10-year retention obligation (art. 958f CO) is not interrupted by the change in legal form.
Numbering and references
Invoice, document and entry numbering must follow a coherent logic even when switching to the new entity. AccountEX allows you to maintain the number sequence or start a new one with a clear continuity reference.
Comparative reports
To analyse business performance it is essential to compare data before and after the transition. AccountEX generates comparative reports that integrate sole proprietorship and GmbH data in a single timeline view.
AccountEX is designed to accompany your business growth: switching from sole proprietorship to GmbH does not require starting from scratch. The software automatically migrates the chart of accounts, client/supplier data, invoice history and documents, ensuring full accounting continuity and legal compliance.
How AccountEX migrates your data
Data migration from a sole proprietorship to a GmbH is a delicate process. AccountEX has developed a structured workflow to ensure zero data loss and operational continuity:
Complete snapshot of the sole proprietorship
AccountEX creates a complete snapshot of the sole proprietorship's accounting at the transition date: chart of accounts, balances, client and supplier registers, open invoices, attached documents and custom configurations.
Automatic creation of the new GmbH entity
With one click, AccountEX creates the new GmbH entity within the same platform. The chart of accounts is automatically adapted to GmbH requirements (share capital accounts, legal reserves, shareholder accounts) while maintaining the existing structure.
Opening balance transfer
The sole proprietorship's closing balances become the GmbH's opening balances, with necessary adjustments (contribution in kind, share capital, any revaluations). Every entry is tracked and documented for audit purposes.
Register and history migration
Clients, suppliers, products and services are automatically transferred to the new entity. Transaction history remains searchable with cross-references between old and new accounting.
Document and invoice update
Invoice templates, bank details and header information are updated with the new company name and CR number. Open invoices are migrated with correct attribution to the new entity.
Automatic verification and reconciliation
AccountEX performs an automatic post-migration reconciliation: it compares sole proprietorship totals with GmbH totals, flags any discrepancies and generates a complete migration report for the fiduciary or auditor.
7 practical tips for the transition
- Plan the conversion at year-end: closing the sole proprietorship's books on 31 December and opening the GmbH on 1 January greatly simplifies tax and accounting management
- Have your fiduciary calculate the tax breakeven: the point where a GmbH becomes more advantageous than a sole proprietorship depends on the canton, total income and family situation
- Budget CHF 3,000–6,000 for incorporation: notary (CHF 1,500–3,000), CR registration (CHF 500–800), contribution-in-kind audit (CHF 800–1,500) and fiduciary advice
- Don't forget insurance: with a GmbH you become an employee of your own company and must register with the compensation fund as an employer — LPP, SUVA and family allowance contributions change
- Transfer your VAT number: the FTA allows transfer of the VAT number from the sole proprietorship to the GmbH without interruption. Submit the request at the same time as incorporation
- Update all contracts and commercial relationships: banks, suppliers, insurance, lease agreements. Some require written counterparty consent for transfer to the new entity
- Use AccountEX from the sole proprietorship stage: when it's time to switch to a GmbH, your data — chart of accounts, history, registers — will migrate automatically with zero loss and no need to start over
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