Recalibrating hurdle rates when the risk-free rate is no longer free

The concept at the center of this piece is theweighted average cost of capital, or WACC, specifically how it behaves when base rates rise materially and stay there. The confusion around WACC is rarely about the formula itself. Most finance teams can recite it. The confusion is about inputs: which ones have changed permanently, which ones are lagging, and what happens to capital allocation decisions when the wrong WACC is baked into project approvals for two or three years running.

That lag is the real risk. Between 2022 and 2024, central banks in the US, UK, and eurozone moved benchmark rates from near zero to levels not seen since the early 2000s. By mid-2026, while some easing has occurred, the structural environment remains one where cost of debt is meaningfully higher than the 2010s baseline. Companies that have not revisited their hurdle rates are effectively subsidising marginal investments.

Why it matters for CFOs specifically

The CFO's role in capital allocation is, at its core, a filtering function. Every project, acquisition, or expansion that clears the hurdle rate gets capital. Everything below it does not. If that hurdle is set too low, value-destroying projects pass the test. If it is set too high, good opportunities get killed.

In the 2010s, with 10-year US Treasuries yielding 1.5 to 2.5 percent, a company with an average equity risk premium and moderate leverage could justify a WACC in the 7 to 8 percent range. Many firms ran hurdles at 8 to 10 percent, which gave them a modest buffer. Today, with the 10-year Treasury settling in the 4 to 5 percent range, the same mechanical WACC calculation yields something closer to 9 to 11 percent for a typical industrial or consumer company, before any project-specific risk premium. The buffer many CFOs thought they had has narrowed considerably, or disappeared entirely for capital-intensive businesses.

There is also a strategic asymmetry worth noting. Private equity firms, which compete directly with corporate acquirers for assets, recalibrated their return thresholds relatively quickly because their fund economics forced them to. Many corporate finance functions, by contrast, revisit WACC only at annual budget cycles or when external auditors flag it. That creates a window where corporate buyers are bidding at the wrong price.

How WACC actually works, the mechanics

WACC combines the after-tax cost of debt and the cost of equity, weighted by their respective shares of the capital structure. The formula is:

WACC = (E/V) x Re + (D/V) x Rd x (1 minus tax rate)

where E is equity value, D is debt value, V is total capital, Re is the cost of equity, and Rd is the pre-tax cost of debt.

The cost of equity is where most of the complexity sits. Under the Capital Asset Pricing Model, it equals the risk-free rate plus beta multiplied by the equity risk premium. That risk-free rate is typically proxied by the long-term government bond yield, which means rising rates flow directly into Re, and therefore into WACC, even if a company has not changed its debt structure at all.

Take a concrete example. Suppose a European manufacturing company has a capital structure that is 60 percent equity and 40 percent debt. In 2020, it used a risk-free rate of 0.5 percent (10-year German Bund), an equity risk premium of 5 percent, and a beta of 1.1. Cost of equity: 0.5 + 1.1 x 5 = 6.0 percent. Pre-tax cost of debt: 2.0 percent. Tax rate: 25 percent. WACC: 0.6 x 6.0 + 0.4 x 2.0 x 0.75 = 3.6 + 0.6 = 4.2 percent.

Run the same structure in mid-2026 with a 10-year Bund yield of around 2.8 percent, same equity risk premium and beta, and a debt cost that has repriced to 4.5 percent. Cost of equity: 2.8 + 1.1 x 5 = 8.3 percent. WACC: 0.6 x 8.3 + 0.4 x 4.5 x 0.75 = 4.98 + 1.35 = 6.33 percent. That is a 210 basis point increase driven almost entirely by the rate environment, not by anything this company did operationally. A project generating a 5.5 percent return would have looked acceptable in 2020 and looks like a value destroyer today.

When to use it and when not to: the honest tradeoffs

WACC is the right tool for evaluating projects that match the risk profile of the overall firm. That condition is violated more often than people admit.

If a consumer goods company is evaluating a digital infrastructure investment, the risk profile of that project is closer to technology than to its core operations. Using the firm-wide WACC will almost certainly understate the required return. The textbook correction is to find a comparable pure-play beta, which in practice means identifying listed companies whose entire business resembles the project, unlevering their betas, and relevering at the firm's own capital structure. Damodaran's publicly available datasets (New York University) are a practical reference for beta estimates by sector, and the methodology is well-documented for practitioners who want to go beyond their internal finance team's assumptions.

WACC also has limited utility for businesses with highly uneven cash flow timing, since it assumes a constant discount rate across all periods. Leveraged buyouts often address this by using an Adjusted Present Value approach, separating the base-case unlevered value from the tax shield on debt. For capital projects with meaningful upfront spend and long payback periods, APV can be more informative.

The more common mistake, though, is not methodological. It is the political one: using WACC as a post-hoc justification rather than a filter. When a management team has already decided it wants an acquisition, the discount rate gets nudged, the terminal growth rate gets optimised, and the WACC analysis becomes a formality. The CFO's job is to prevent that. Having a clearly documented, board-approved methodology for setting hurdle rates, reviewed annually against prevailing rate conditions, makes it much harder for motivated reasoning to contaminate individual project approvals.

The structural shift in rates since 2022 has not reversed to the pre-2015 baseline and is unlikely to do so quickly. CFOs who have already updated their WACC assumptions and tightened their capital allocation criteria are operating with an accurate filter. Those still running 2019-era hurdle rates are making decisions with a miscalibrated instrument, and the compounding effect on capital allocation quality will show up in returns over a three to five year horizon.