Reviewed by Finin2min Editorial Desk · Last reviewed 11 August 2026
Calculate WACC from market-value weights, cost of equity, pre-tax cost of debt and the marginal tax rate.
Enter capital structure
WACC
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After-tax cost of debt
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Equity weight
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Debt weight
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Calculation guidance will appear here.
How This Is Calculated
WACC blends the cost of each capital source (equity and debt) weighted by its proportion of total capital structure — equity cost weighted by equity's share of total capital, plus after-tax debt cost weighted by debt's share — giving a single blended rate representing the minimum return a company must earn to satisfy all its capital providers.
Frequently Asked Questions
Why is debt cost adjusted for tax in the WACC formula?
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Because interest payments are typically tax-deductible, the effective (after-tax) cost of debt is lower than the stated interest rate — WACC uses this after-tax cost to accurately reflect the real net cost of debt financing to the company.
Why does WACC matter for investment decisions?
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WACC is commonly used as the discount rate in NPV and DCF analysis, and as the hurdle rate a project's expected return should exceed — a project earning less than WACC is generally destroying value for capital providers, even if it's nominally "profitable."
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Scope: Computes the Weighted Average Cost of Capital (WACC) — the blended required return across a company's debt and equity financing — commonly used as the discount rate in DCF valuation.
Calculation logic
WACC = (E/V × Cost of equity) + (D/V × Cost of debt × (1 − Tax rate)), where E is the market value of equity, D is the market value of debt, and V = E + D.
Cost of equity is taken as entered (e.g., derived via CAPM: Risk-free rate + Beta × Equity risk premium, if the user provides those components) or entered directly.
Cost of debt is entered pre-tax and adjusted for the tax shield using (1 − Tax rate), reflecting that interest is tax-deductible in most jurisdictions including India.
Inputs and assumptions
Uses market values (not book values) of debt and equity where available, per standard corporate finance practice — the calculator uses whatever values the user enters and assumes they reflect the intended (market or book) basis consistently.
The tax rate entered should reflect the entity's effective/marginal tax rate for the interest tax-shield adjustment.
Exclusions and edge cases
Does not independently derive Beta, the equity risk premium, or the entity's cost of debt from market data — those are user inputs or must be sourced separately.
Preference share capital, if present in the capital structure, must be entered as a separate component; the base formula shown covers debt and equity only unless the extended fields are used.
Sources
No external regulatory source applies — this is a general financial formula, not a statutory computation.
Review status: reviewed and approved by CA Nikhil Gupta on 18 July 2026.
Guides on this topic
Background, worked examples and the rules behind these numbers.
Finin2min is not registered with the Securities and Exchange Board of India (SEBI) as an Investment Adviser or as a Research Analyst. This tool performs an arithmetic calculation on the figures you enter and is published for general information and educational purposes only. It is not investment advice, it is not personalised to your financial circumstances, objectives or risk tolerance, and it is not a recommendation to buy, sell or hold any security, scheme or product. Projected values are illustrative and follow directly from the assumptions you supply; actual returns will differ, and past performance does not indicate future results. Consider consulting a SEBI-registered Investment Adviser before acting on any investment decision.