WACC combines two components: the cost of equity (estimated using the Capital Asset Pricing Model — risk-free rate + beta × equity risk premium) and the after-tax cost of debt. These are weighted by the proportion of equity and debt in the target capital structure. For private SMEs, estimating the cost of equity is more art than science: beta must be estimated from listed comparables and adjusted for size, leverage, and illiquidity.
For unlisted mid-market SMEs in France and Switzerland, practical WACCs typically range from 10% to 15%. The key drivers of a higher WACC are: higher business risk (volatile revenues, cyclical sector), higher leverage, smaller size (adds illiquidity premium of 1–3%), and weaker market position. A well-run, contracted, asset-light services business in a stable sector will carry a lower WACC than an equipment-intensive manufacturer with project-based revenues.
In SME transactions, WACC is most influential as a sensitivity parameter: buyers and their advisors will run the DCF at multiple WACC assumptions (bear/base/bull) to define the valuation range. Sellers who understand WACC dynamics can argue for lower discount rates by demonstrating revenue stability, long-term contract cover, and low customer concentration — all of which reduce perceived business risk.
WACC calculation sketch
Risk-free rate (10yr OAT): 3.1%. Equity risk premium: 5.5%. Beta (unlevered comparable): 0.85, relevered for 30% debt: 1.05. Cost of equity: 3.1% + 1.05 × 5.5% = 8.9%. Cost of debt (after 25% tax): 4.5% × 0.75 = 3.4%. WACC at 70/30 E/D: 8.9% × 0.7 + 3.4% × 0.3 = 7.3%. Add SME illiquidity premium of 3%: effective WACC ≈ 10.3%.
Frequently asked questions
Why does WACC matter so much in SME valuations?
In a DCF, a 1% increase in WACC reduces enterprise value by roughly 10–15% for a typical SME. At a €20m enterprise value, that is €2–3m of value destroyed by a single percentage point of additional discount rate. This makes WACC the single most contested assumption in any DCF-based negotiation.
Is WACC used directly in mid-market deal pricing?
Rarely as the primary pricing mechanism. Most mid-market deals are priced on EBITDA multiples, with DCF/WACC used as a cross-check or second opinion. Where DCF carries more weight is in regulated sectors, asset-heavy businesses, or scenarios where comparable transactions are scarce.
How do buyers estimate WACC for a private SME?
They typically start from listed comparable companies' betas, unlever them (removing the comparables' own leverage), then relever for the target's capital structure. They add a size premium and illiquidity premium. The result is then cross-checked against expected returns from comparable private equity transactions in the sector.