What is the cost of capital and why is it important for project evaluation?

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The cost of capital is the return required by investors for providing capital to the firm or a project. It represents the opportunity cost of using funds elsewhere with similar risk. In project evaluation, this rate serves as the discount rate for future cash flows, turning them into present value and allowing you to judge whether the project creates value. The rate often used is the weighted average cost of capital (WACC), which blends the after-tax cost of debt with the cost of equity according to how the project is financed. If the project’s net present value, when cash flows are discounted at this rate, is positive, it adds value; if negative, it should likely be avoided. This rate also reflects risk: riskier projects typically require a higher return, raising the discount rate. It isn’t the government bond rate (a separate, risk-free benchmark), nor the corporate tax rate, nor the rate charged by suppliers.