Tax Regularisation and Voluntary Disclosure in Switzerland
In the Swiss tax system, the regularisation of undeclared assets represents a well-governed legal process. Voluntary disclosure offers taxpayers the opportunity to regularise their tax situation without incurring criminal sanctions, under certain strict conditions. This procedure, accessible to both natural persons and legal entities, constitutes a mechanism that allows compliance with tax obligations to be achieved. Our law firm assists taxpayers in this complex process which requires in-depth knowledge of the Swiss legal framework, cantonal administrative practices and the long-term implications of such a procedure.
Statutory Conditions for Penalty-Free Voluntary Disclosure
| Condition | Legal Requirement | Consequence if Not Met |
|---|---|---|
| Spontaneity | Must occur before any intervention by the FTA | Loss of benefit: ordinary fines applicable |
| First disclosure | Only once in the taxpayer's lifetime | Second disclosure: reduced fines only |
| Unreserved cooperation | Provide all requested documents, answer questions | Risk of reclassification as intentional tax evasion |
| Exhaustiveness | Declare all undeclared elements (no omissions) | Omissions = new evasions not covered by the disclosure |
| Payment | Seriously endeavour to pay the back-tax assessment | Payment facilities possible; refusal = loss of benefit |
Step-by-Step Procedure
| Step | Action | Deadline / Remarks |
|---|---|---|
| 1. Preliminary analysis | Comprehensive inventory of undeclared assets/income, assessment of prescription | Confidential with lawyer; necessary before any step |
| 2. Filing the disclosure | Written declaration to the competent cantonal FTA, mentioning the intention of voluntary disclosure | Must be voluntary (before audit or AEOI) |
| 3. Submission of documents | Bank statements, value certificates, income evidence | Upon FTA request; deadlines to be respected |
| 4. Supplementary assessment | FTA recalculates tax over 10 years + default interest | Possibility to contest the calculation by objection |
| 5. Payment | Settlement of back-tax assessment and interest | Payment facilities negotiable if significant amount |
| 6. Closure | Confirmation of no criminal prosecution by the FTA | No fine if conditions respected |
Financial Consequences: Estimating the Cost of Regularisation
| Component | Calculation | Example (CHF 100,000 tax evaded/year) |
|---|---|---|
| Back-tax assessment (10 years) | Actual taxes due × number of years | CHF 1,000,000 |
| Default interest (3–5%/year) | ~30–50% of back-tax assessment depending on rate and duration | CHF 300,000–500,000 |
| Fines (if voluntary disclosure) | CHF 0 (total exemption) | CHF 0 |
| Fines (without voluntary disclosure) | 1× to 3× the evaded amount | CHF 1,000,000–3,000,000 |
| Total with voluntary disclosure | Back-tax + interest only | CHF 1,300,000–1,500,000 |
| Total without voluntary disclosure | Back-tax + interest + fines | CHF 2,300,000–4,500,000 |
These figures are purely illustrative. The exact amount depends on the cantonal default interest rate, the applicable tax scale and the duration of the years concerned.
Special Regime for Heirs
A particular regime exists for heirs who discover undeclared elements in the estate. In this case, heirs may proceed with a voluntary disclosure with additional advantages:
- No fine
- Back-tax assessment limited to the last three fiscal periods before death (instead of ten)
- Period of three months after the opening of the estate to file the disclosure
Legal Foundations of Voluntary Disclosure in Switzerland
Voluntary disclosure in Switzerland finds its basis in the Federal Act on Direct Federal Tax (DFTA) and the Federal Act on the Harmonisation of Direct Cantonal and Communal Taxes (TAHA). More specifically, article 175 para. 3 DFTA and article 56 para. 1bis TAHA provide for the possibility for a taxpayer to regularise their situation without incurring criminal sanctions.
Current Context: The Automatic Exchange of Information
The implementation of the automatic exchange of information (AEOI) has fundamentally transformed the tax compliance environment. Since 2017, Switzerland has exchanged financial information with more than 100 partner jurisdictions. This enhanced transparency means that:
- Tax authorities automatically receive information on accounts held by their residents abroad
- The probability of detecting undeclared assets has considerably increased
- The window of opportunity for a genuinely "voluntary" disclosure is narrowing
This new reality encourages many taxpayers to regularise their situation before the administration receives information through the AEOI, in which case the disclosure would no longer be considered voluntary.
Frequently Asked Questions on Voluntary Disclosure
How many times may one benefit from penalty-free voluntary disclosure?
Only once in the taxpayer's lifetime for a complete and penalty-free disclosure (art. 175 para. 3 DFTA). Subsequent partial disclosures are possible but with reduced sanctions (not a total exemption). It is therefore essential that the first disclosure is exhaustive and covers all undeclared elements.
How many years does the back-tax assessment cover in a voluntary disclosure?
The back-tax assessment covers the last 10 non-prescribed fiscal years (ordinary prescription period). Default interest calculated from the date when the tax should have been paid is added. For heirs who disclose the undeclared assets of a deceased, a special regime applies: assessment limited to the last 3 years before death.
What happens if the FTA is already aware of the assets before the disclosure?
The disclosure loses its voluntary character if the tax administration is already aware of the tax evasion, notably via the automatic exchange of information (AEOI). In this case, ordinary fines apply. The window for a genuinely voluntary disclosure is narrowing with the extension of the AEOI network to more than 100 countries.
What documents must be provided in a voluntary disclosure?
The disclosure must be complete and include: the exhaustive list of undeclared elements (accounts, income, assets), available historical bank statements, documents certifying values (stock prices, property valuations), supporting documentation for any potentially deductible expenses. Absence of documents does not block the disclosure but a methodology for reconstruction must be proposed to the FTA.