Corporate income tax (Gewinnsteuer) is the principal direct tax borne by legal entities in Switzerland. It is levied simultaneously at three levels: federal (Swiss federal tax — IFD, fixed rate of 8.5% on net profit before tax, approximately 7.83% after deduction), cantonal and municipal (variable rates by canton, ranging from 5% to 20% of taxable profit). The combined effective rate varies from 11.9% (canton of Zug) to 24.2% (certain Geneva or Vaud municipalities) depending on the company's location.

The tax base is the net profit from the income statement, after reintegration of non-deductible charges and deduction of tax-favourable items including the participation relief (Beteiligungsabzug), carried-forward losses, and admitted depreciation. The 2019 TRAF tax reform (Tax Reform and AHV Financing) abolished preferential cantonal tax regimes while introducing OECD-compliant incentives: patent box, R&D deductions, and step-up on entry into ordinary taxation.

In M&A transactions and business valuations, the effective cantonal tax rate is a key parameter of the WACC and free cash flow projections. An effective rate of 14.5% in Zug vs 21.5% in Geneva represents a 7% annual tax difference — a significant valuation impact over a 5-year DCF horizon.

Example: a Swiss holding considers three cantons for its operating subsidiary. Projected pre-tax profit: CHF 1.5 million. Zug: tax CHF 218,000 (14.5%); Vaud: CHF 308,000 (20.5%); Geneva: CHF 323,000 (21.5%). The annual gap between Zug and Geneva is CHF 105,000 — CHF 525,000 cumulative over 5 years, directly impacting DCF value.

At Hectelion, we integrate cantonal corporate income tax in our valuation models and structuring advice for Franco-Swiss companies.