Hidden equity in Switzerland: mechanisms, stakes, recent developments

Hidden equity, or capital propre dissimulé, is a central pillar of Swiss corporate taxation. This concept is designed to prevent tax base erosion caused by overly indebted financing structures originating from related parties. By reclassifying a portion of debt as equity, tax authorities neutralize the undue advantages linked to interest deductibility, thereby protecting tax revenues. This report examines the legal foundation, calculation methods, tax implications, and recent developments of this mechanism, relying on legal texts, administrative doctrine, and case law.

Legal basis and objectives

Hidden equity is governed by Article 65 of the Federal Direct Tax Act (LIFD) and Article 29a of the Tax Harmonisation Act (LHID). These provisions aim to counter thin capitalization practices, where loans granted by shareholders or related parties improperly replace proper equity, thus reducing taxable profit via interest deduction. The objective is to align tax treatment with economic reality: excessive debt from related parties is treated as equity because it exposes the company to abnormal financial risk.

Qualification criteria

For a loan to be reclassified as hidden equity, three cumulative conditions must be met:

1. Related-party origin: The financing comes from a shareholder or a closely related person.

2. Lack of access to independent third parties: The company could not obtain such financing from external creditors under normal market conditions (at arm's length).

3. Abnormal risk exposure: The funds are disproportionately exposed to business risk.

An exception exists for third-party loans guaranteed by related parties, which remain subject to reclassification.

Steps for calculating hidden equity

The determination of hidden equity follows a structured process involving five main steps:

1. Assess assets at fair market value: Determine the market value of all assets at the end of the fiscal year.

2. Apply asset-specific debt ratios: Apply the maximum percentages defined by the FTA Circular No. 6a.

3. Calculate total permissible debt: Determine the total amount of external financing theoretically accessible.

4. Compare with the company's actual debt: Compare the actual debt against the permissible debt.

5. Calculate adjustments: Determine the amount of hidden equity and the resulting tax adjustments.

Fair market value of assets

The calculation begins by assessing assets at their fair market value (market value) at the end of the fiscal year, in accordance with the Federal Tax Administration (FTA) Circular No. 6a, updated in October 2024. The values used for income tax purposes serve as a reference, unless proven otherwise.

Admissible debt ratios

The FTA sets maximum debt percentages per asset category, reflecting the company's presumed borrowing capacity according to Circular No. 6a of 2024:

The total permissible debt is compared to the actual debt. Any excess is reclassified as hidden equity.

Practical example

A holding company owning participations valued at 10 million CHF could borrow up to 7 million CHF (70%). If its actual debt amounts to 9 million CHF, 2 million CHF is reclassified as hidden equity.

Income tax

Interest corresponding to the hidden equity is re-added to the taxable profit, nullifying its deductibility. Furthermore, this interest is treated as a fictitious dividend, subject to 35% withholding tax. For example, a company with 2 million CHF of hidden equity at an interest rate of 5% will have to re-integrate 100,000 CHF in financial charges into its taxable income.

Capital tax

The taxable capital is increased by the reclassified amount, thereby raising the basis for calculating capital tax. For a Geneva-based company with a 0.3% capital tax rate, this would represent an additional tax cost of 6,000 CHF per million of hidden equity.

Treatment of repayments

The repayment of hidden equity is not considered a dividend distribution and remains tax-neutral, provided the balance sheet structure remains compliant with legal ratios post-repayment.

Financing structure

• Prioritize equity for high-risk assets (e.g., strategic participations).

• Limit personal guarantees from shareholders on bank loans.

• Document financing agreements with stand-alone clauses to prove the independence of creditors.

Use of tax rulings

Companies can request a preliminary tax ruling to validate their capital structure, thereby reducing litigation risks. This practice is particularly recommended for complex cross-border operations.

Continuous monitoring

An annual review of debt ratios is essential, especially after exceptional transactions (acquisitions, disposals). Tax modeling tools enable the simulation of the impact of asset value variations on hidden equity.

Cantonal interpretation conflicts

Certain cantons, such as Geneva, apply slightly divergent ratios for financial companies, creating legal uncertainties. Intercantonal harmonization is called for by doctrine.

Risk of double taxation

In case of reclassification, interest may be taxed both at the borrower's level (as profit) and at the lender's level (as income), despite non-double taxation treaties. This risk is increased in multinational structures.

Adaptation to international standards

The growing pressure to align Swiss rules with OECD standards could challenge the current system, considered too favorable to holding companies. A reform introducing interest limitation rules (as in the EU) is currently being debated.

Hidden equity remains a key instrument of Swiss anti-fraud policy, but its application raises complex challenges. While recent legal developments enhance transparency, they also increase the administrative burden on companies. Moving forward, the balance between legal certainty and fiscal competitiveness will depend on the authorities' ability to integrate international standards without sacrificing the specificities of the Swiss model. Tax professionals must intensify their monitoring of Federal Supreme Court judgments and FTA circular amendments to anticipate reclassification risks.