What is the internal rate of return?

Internal rate of return (IRR) is the discount rate that makes the net present value of an investment's cash flows equal to zero, representing the investment's effective yield. For professional service firms evaluating investments in technology, acquisitions, or expansion, IRR provides a standardized return measure for comparison. A higher IRR indicates a more attractive investment, but it should be compared to the cost of capital.

Key characteristics

• Discount rate where NPV equals zero

• Represents an effective investment yield

• Enables comparison across investments

• Should exceed the cost of capital to create value

• Affected by the timing of cash flows

• Standard investment analysis metric

Why it matters for professional service firms

IRR enables apples-to-apples comparison of different investments with varying cash flow patterns. A technology investment with an 18% IRR can be compared directly with an acquisition with a 12% IRR. Professional service firms making significant investments should calculate IRR to evaluate whether returns justify the investment and to prioritize among competing opportunities when capital is limited.

Real-world example

Chris's firm evaluated two investments: a technology upgrade requiring $80K upfront with $25K annual savings for 5 years. Office expansion requiring $150K upfront with $30K annual benefit for 7 years. Technology IRR: approximately 17%. Expansion IRR: approximately 11%. Cost of capital: 10%. Both exceeded the cost of capital (value creating), but technology had a higher return. Given limited capital, technology was prioritized. The IRR analysis provided an objective framework for decision-making rather than subjective preference.