Swiss company audit requirements are determined by the size of the business, not by the preferences of its directors. The Swiss Code of Obligations sets out clear thresholds in Articles 727 to 728a, and every company incorporated as a GmbH, AG, or cooperative must assess which category it falls into each year. Getting this wrong carries real consequences: financial statements prepared without the required audit level are legally defective, and the commercial register office can initiate enforcement proceedings.
For the majority of newly formed companies, the audit obligation is modest or non-existent. Around 90% of Swiss GmbHs and small AGs qualify to opt out of the audit entirely. But as a company grows, it will cross thresholds that trigger mandatory audit requirements, and understanding where those lines sit is essential for budgeting, governance, and compliance planning.
Why do audit requirements matter for Swiss companies?
The audit is not just a formality. It serves three purposes under Swiss corporate law. First, it protects shareholders — particularly minority shareholders — by providing independent verification that the financial statements reflect the company’s actual position. Second, it protects creditors by confirming that the company’s reported equity is real. Third, it ensures that dividends are only distributed from genuinely available profits.
For companies operating in regulated sectors, the audit also satisfies supervisory requirements. Banks, securities firms, and collective investment schemes face additional audit obligations under FINMA regulations that go beyond the standard OR provisions.
What are the three categories of audit in Switzerland?
Swiss law under OR Art. 727 and 727a establishes three distinct audit categories. The category that applies depends on the company’s size, measured by total assets, revenue, and headcount.
Ordinary audit (ordentliche Revision) applies to larger companies. Limited audit (eingeschränkte Revision) applies to mid-sized companies. Opting out (Verzicht auf die Revision) is available to the smallest companies. Each category has different scope, cost, and procedural requirements.
The assessment is made based on the balance sheet date figures for the two most recent financial years. A company only moves up a category if it exceeds the relevant thresholds in two consecutive years, which prevents a single exceptional year from triggering an unnecessary upgrade.
When is an ordinary audit required in Switzerland?
Under OR Art. 727, an ordinary audit is mandatory for:
- Public companies — any company with outstanding bonds or equity securities listed on a stock exchange
- Large private companies — those exceeding two of three thresholds in two consecutive financial years: total assets of CHF 20 million, revenue of CHF 40 million, or 250 full-time equivalent employees
- Companies required to prepare consolidated financial statements
- Companies where a shareholder or group of shareholders holding at least 10% of share capital requests it
The ordinary audit is a full-scope engagement conducted under Swiss Auditing Standards (SAS), which are aligned with International Standards on Auditing (ISA). The auditor performs substantive testing of transactions, verifies account balances, assesses internal controls, and issues a positive assurance opinion. The audit report states whether the financial statements comply with Swiss law and the articles of association, and specifically confirms that the proposed distribution of available earnings conforms to legal requirements.
The ordinary auditor must be a licensed audit expert (zugelassener Revisionsexperte) under OR Art. 727b, and the audit firm must hold a state-supervised licence from the Federal Audit Oversight Authority.
What is a limited audit and who needs one?
OR Art. 727a para. 1 requires a limited audit for companies that do not meet the ordinary audit thresholds but have more than 10 full-time equivalent employees. This is the default category for the majority of established Swiss SMEs.
The limited audit is a review engagement, not a full audit. The auditor performs analytical procedures — comparing current-year figures to prior years, budgets, and industry benchmarks — and makes enquiries of management. There is no detailed substantive testing of individual transactions, no confirmation of receivables with third parties, and no assessment of internal controls.
The auditor’s report provides negative assurance: it states that nothing has come to the auditor’s attention causing them to believe the financial statements are materially misstated. This is a lower level of assurance than the positive opinion issued in an ordinary audit.
A limited audit typically requires 20 to 40 hours of auditor time, compared with 80 to 200+ hours for an ordinary audit of a comparable company.
How can a Swiss company opt out of the audit obligation?
The smallest companies may dispense with the audit entirely. Under OR Art. 727a para. 2, a company may opt out if:
- It has 10 or fewer full-time equivalent employees (calculated as an annual average)
- All shareholders consent unanimously — a single dissenting shareholder blocks the opting-out
The opting-out declaration must be filed with the cantonal commercial register. Once recorded, it remains valid indefinitely unless revoked by a shareholder or invalidated because the company exceeds 10 employees.
This provision applies to GmbHs, AGs, and cooperatives alike. It does not apply to companies with publicly traded securities or companies subject to special supervision (banks, insurance companies, collective investment schemes).
In practice, the vast majority of newly incorporated companies in Switzerland use the opting-out provision. A company with two founders and no employees has no reason to bear audit costs, and the unanimous consent requirement is easily met when the shareholder group is small.
How do the three audit categories compare?
| Criterion | Ordinary audit | Limited audit | Opting out |
|---|---|---|---|
| Legal basis | OR Art. 727 | OR Art. 727a para. 1 | OR Art. 727a para. 2 |
| Who qualifies | CHF 20m assets, CHF 40m revenue, or 250 FTEs (2 of 3, two consecutive years); listed companies; consolidated accounts | > 10 FTEs, below ordinary thresholds | 10 or fewer FTEs |
| Shareholder consent | Not required | Not required | Unanimous consent of all shareholders |
| Scope | Full substantive testing, internal controls review | Analytical procedures, enquiries only | No audit performed |
| Assurance level | Positive opinion | Negative assurance | None |
| Auditor qualification | Licensed audit expert (RAB state-supervised licence) | Licensed auditor (RAB licence) | N/A |
| Typical cost | CHF 15,000 – 80,000+ | CHF 3,000 – 8,000 | CHF 0 |
| Typical duration | 80 – 200+ hours | 20 – 40 hours | N/A |
| Report filed with | Shareholders’ meeting; commercial register (if ordinary audit status changes) | Shareholders’ meeting | Opting-out declaration filed with commercial register |
Who can perform a statutory audit in Switzerland?
Swiss law imposes strict requirements on who may serve as a statutory auditor. The Federal Audit Oversight Authority (RAB, Eidgenössische Revisionsaufsichtsbehörde) is the licensing and supervisory body established under the Auditor Oversight Act (RAG).
For ordinary audits, the auditor must be a licensed audit expert (zugelassener Revisionsexperte) or an audit firm under state supervision. State-supervised audit firms undergo periodic inspections by RAB and must demonstrate quality control systems that meet international standards. Under OR Art. 728, the auditor must also be independent of the company — there must be no financial, personal, or business relationship that could compromise objectivity.
For limited audits, a licensed auditor (zugelassener Revisor) is sufficient. This is a lower qualification tier than the audit expert designation. The independence requirements under OR Art. 728 still apply in full.
RAB maintains a public register of all licensed auditors where companies can verify that a prospective auditor holds a valid licence. As of 2025, approximately 2,100 audit firms and 9,500 individuals hold RAB licences.
The auditor is elected by the shareholders’ meeting (Generalversammlung) and serves for a term of one to three years, with re-election permitted. For ordinary audits, the lead auditor must be rotated after seven years.
What do auditors examine in a Swiss company audit?
The scope differs substantially between audit types, but certain elements are always checked:
Both ordinary and limited audits cover:
- Compliance of the annual financial statements with Swiss GAAP (OR Art. 957-963b) or the applicable accounting standard
- Correct application of valuation principles
- Whether the proposed profit distribution complies with legal capital protection rules
- Existence and proper disclosure of significant contingent liabilities
Ordinary audits additionally include:
- Testing of individual transactions and account balances
- Verification of assets (physical inventory counts, bank confirmations, receivable confirmations)
- Assessment of the internal control system (ICS) and reporting on any significant weaknesses
- Review of the annual report (Geschäftsbericht) for consistency with the financial statements
- Confirmation that statutory provisions and the articles of association have been observed
The auditor presents a written report to the shareholders’ meeting recommending approval, conditional approval, or rejection of the financial statements.
How much does a company audit cost in Switzerland?
Audit fees are not regulated and are set by commercial negotiation. However, typical ranges based on current market rates are:
Limited audit (eingeschränkte Revision):
- Micro-company (under CHF 1 million revenue): CHF 3,000 – 5,000
- Small company (CHF 1–5 million revenue): CHF 4,000 – 8,000
- Mid-sized company (CHF 5–20 million revenue): CHF 6,000 – 12,000
Ordinary audit (ordentliche Revision):
- Straightforward single-entity company: CHF 15,000 – 30,000
- Company with subsidiaries or complex structure: CHF 30,000 – 60,000
- Large or regulated company: CHF 60,000 – 80,000+
These figures cover the statutory audit only. Additional services — tax compliance review, agreed-upon procedures, advisory letters — are billed separately. Companies should obtain quotes from at least two or three licensed firms, as pricing varies significantly between the Big Four, mid-tier firms, and regional practices.
For companies considering their overall annual compliance obligations, the audit fee is typically the single largest compliance cost after accounting and tax preparation.
What is the audit timeline and process?
The annual audit follows a predictable calendar:
| Phase | Timing | Activities |
|---|---|---|
| Planning | 1–2 months before year-end | Auditor reviews prior year findings, assesses risk areas, agrees timetable with management |
| Interim audit (ordinary only) | During final quarter | Testing of internal controls, walk-throughs of key processes |
| Year-end fieldwork | 1–3 months after balance sheet date | Substantive testing, balance confirmations, inventory observation |
| Draft report | Within 4 months of year-end | Auditor issues draft report and management letter |
| Final report | Before AGM (within 6 months of year-end) | Signed audit report presented to shareholders for approval |
For a company with a 31 December financial year-end, the typical sequence runs from October (planning) through May or June (AGM approval). Swiss law requires that the annual general meeting be held within six months of the balance sheet date — by 30 June for calendar-year companies.
Limited audits follow a compressed version of this timeline. Because no interim audit or substantive testing is required, the entire review can be completed within two to four weeks of receiving the draft financial statements.
What happens if a Swiss company fails to comply with audit requirements?
Failing to meet Swiss company audit requirements triggers a chain of increasingly serious consequences:
-
Commercial register enforcement — The register office identifies companies that are required to have an auditor but have not appointed one, and sets a compliance deadline, typically 30 to 60 days.
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Court petition — If the company does not comply, the register office or any shareholder may petition the competent court under OR Art. 731b. The court may appoint an auditor, appoint a receiver, or order dissolution and liquidation.
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Defective financial statements — Annual accounts approved without the required audit are legally defective. Dividend distributions based on unaudited statements may be recoverable from shareholders, and directors who authorised such distributions face personal liability.
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Director liability — Under OR Art. 754, directors are personally liable for damages caused by intentional or negligent breach of their duties. Failure to organise a proper audit is a clear governance failure.
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Creditor risk — In insolvency, creditors can challenge financial statements that lacked the required audit and pursue directors for the shortfall.
Companies approaching the ordinary audit thresholds should monitor their figures carefully during the second half of the financial year. Crossing the line unexpectedly can create an unbudgeted cost of CHF 15,000 or more and delay the AGM if no auditor has been appointed.
Practical recommendations
For companies at or near the thresholds, several practical steps can reduce friction:
- Track headcount carefully. The 10-employee threshold for opting out is based on full-time equivalents averaged over the year. Two part-time employees at 50% each count as one FTE. Seasonal fluctuations matter.
- Secure unanimous consent early. If your company has multiple shareholders and you wish to opt out, obtain written consent at incorporation and reconfirm it annually. A new shareholder who refuses consent will trigger a limited audit obligation.
- Budget for the transition. Moving from opting-out to a limited audit adds CHF 3,000 to 8,000 in annual costs. Moving from limited to ordinary audit adds CHF 10,000 to 50,000+. Factor these costs into your growth projections.
- Appoint the auditor before you need one. If you anticipate crossing a threshold, engage an audit firm in the current year. Starting the relationship before the first mandatory audit gives the auditor time to understand your business and avoids last-minute complications.
Why you can trust this guide
Audit thresholds, licensing requirements, and cost ranges cited here are based on OR Art. 727-728a, the Auditor Oversight Act (RAG), and current data from the Federal Audit Oversight Authority (RAB) public register at rab-asr.ch. Fee ranges reflect 2026 market rates collected from EXPERTsuisse member firms and verified against published audit engagement data. All legislative references link to Fedlex, Switzerland’s official legal publication platform.
For further details on how audit obligations fit within the broader compliance framework, see our guide to business banking and annual compliance in Switzerland. Companies also preparing to open a corporate bank account should note that some banks request evidence of the company’s audit status as part of their due diligence.
Frequently Asked Questions
Does every Swiss company need an audit?
No. Swiss law provides three categories based on company size. Companies exceeding two of three thresholds — CHF 20 million in total assets, CHF 40 million in revenue, or 250 full-time employees — in two consecutive financial years require an ordinary audit. Companies below those thresholds but with more than 10 full-time employees require a limited audit. Companies with 10 or fewer full-time employees may opt out entirely if all shareholders consent unanimously, under OR Art. 727a para. 2.
How much does a company audit cost in Switzerland?
Costs vary significantly by audit type and company size. A limited audit for a small GmbH or AG typically costs between CHF 3,000 and CHF 8,000. An ordinary audit starts at around CHF 15,000 for straightforward cases and can exceed CHF 80,000 for larger companies with complex structures, multiple subsidiaries, or international operations. The final fee depends on the number of audit hours, the complexity of accounting records, and the industry — regulated sectors such as financial services attract higher fees due to additional compliance checks.
What is the difference between an ordinary audit and a limited audit in Switzerland?
An ordinary audit (ordentliche Revision) is a full-scope examination under Swiss Auditing Standards, where the auditor expresses a positive opinion on whether the financial statements give a true and fair view. A limited audit (eingeschränkte Revision) is a review engagement — the auditor performs analytical procedures and inquiries but no detailed substantive testing, and issues a negative assurance statement confirming that nothing has come to their attention suggesting material misstatement. The ordinary audit is substantially more expensive and time-consuming, typically requiring two to four times the number of audit hours.
How does a Swiss company opt out of the audit requirement?
To opt out under OR Art. 727a para. 2, the company must have 10 or fewer full-time equivalent employees, and all shareholders must consent unanimously. The opting-out declaration is submitted to the commercial register and recorded in the company's entry. The declaration remains valid until revoked. If the company later exceeds 10 employees, the opting-out automatically becomes invalid and the company must appoint an auditor. There is no minimum revenue or asset threshold for opting out — only the employee count and shareholder consent matter.
What happens if a Swiss company fails to appoint an auditor when required?
The commercial register office monitors compliance and will set a deadline for the company to appoint a licensed auditor. If the company fails to act, the register office or any shareholder may petition the court under OR Art. 731b to appoint an auditor, dissolve the company, or order other necessary measures. In practice, courts typically grant a final grace period before ordering dissolution. Directors may also face personal liability for damages caused by the failure to maintain proper audit oversight, and creditors can challenge financial statements that were not properly audited.
Can a foreign audit firm audit a Swiss company?
Only audit firms and individuals licensed by the Federal Audit Oversight Authority (RAB) may perform statutory audits of Swiss companies. A foreign audit firm without RAB licensing cannot serve as the statutory auditor. However, a Swiss-licensed firm may rely on audit work performed by foreign affiliates for subsidiary-level procedures, provided the Swiss lead auditor retains full responsibility. RAB maintains a public register of all licensed auditors and audit firms at rab-asr.ch.
What is a limited audit and what level of assurance does it provide?
A limited audit (eingeschränkte Revision) is a review engagement under OR Art. 727a. The auditor performs analytical procedures, inquiries of management, and targeted checks, but does not carry out the detailed substantive testing required in an ordinary audit. The result is a negative assurance opinion — the auditor states that nothing has come to their attention suggesting material misstatement. This provides less assurance than an ordinary audit positive opinion, but is sufficient for most small and medium-sized Swiss companies. Costs typically range from CHF 3,000 to CHF 8,000 per year.
Can shareholders trigger an ordinary audit even if the thresholds are not met?
Yes. Under OR Art. 727 para. 3, shareholders holding at least 10% of the share capital can demand that an ordinary audit be conducted even if the company does not exceed the ordinary audit thresholds. This right is most commonly exercised by minority shareholders in a dispute, where an independent high-assurance audit is desired to verify the accuracy of the financial statements. The cost of the ordinary audit is borne by the company. Directors cannot refuse the request if it comes from qualifying shareholders.
When does the opting-out of the limited audit become invalid?
The opting-out declaration under OR Art. 727a para. 2 automatically becomes invalid when the company exceeds 10 full-time equivalent employees. Once the company has more than 10 employees, it must appoint a licensed auditor for the limited audit within the next financial year. Additionally, if a shareholder who originally consented to the opting-out transfers their shares to a new holder, the new holder's consent to the opting-out should be confirmed. If all shareholders no longer unanimously consent, the opting-out is no longer valid and an auditor must be appointed.
What qualifications must a Swiss statutory auditor hold?
Swiss statutory auditors must be licensed by the Federal Audit Oversight Authority (RAB). For a limited audit, a licensed auditor (zugelassener Revisor) registration is sufficient. For an ordinary audit of a company with securities listed on a stock exchange or with more than 100 shareholders, a state-supervised audit firm (staatlich beaufsichtigtes Revisionsunternehmen) is required. These designations correspond to different levels of experience, examination, and ongoing training requirements set by the Auditor Oversight Act (RAG).