Investment Evaluation: VAN vs IRR | Choose the Right Metric to Make Informed Decisions

Two Powerful Tools in Investment Decision-Making

Before making any investment decision, professional investors and companies typically need to answer a core question: Is this project worth investing in? For this purpose, two classic financial metrics have emerged—Net Present Value (NPV) and Internal Rate of Return (IRR). These tools help investors determine whether an investment can generate real returns, but they operate on completely different principles.

Interestingly, these two indicators sometimes give conflicting signals. A project might have a higher NPV but a lower IRR; or vice versa. That’s why understanding the difference between them is crucial—they represent two different dimensions of investment evaluation.

NPV: Measuring Value in Real Terms

The core concept of Net Present Value (NPV) is simple: discount future cash flows to today’s value to see how much you can earn.

Specifically, NPV calculates the sum of all future cash flows generated by the investment (discounted to present value) minus the initial investment cost. If this number is positive, it indicates profit; if negative, it indicates a loss.

Calculating NPV requires three elements:

• Future Cash Flows: projected cash generated in each period (could include sales revenue, operating costs, taxes, etc.)
• Initial Cost: how much money is invested upfront
• Discount Rate: used to convert future cash flows into present value

NPV formula:

NPV = (Cash Flow1 / ((1 + Discount Rate)^1 + )Cash Flow2 / )(1 + Discount Rate)^2 + … + (Cash FlowN / ((1 + Discount Rate)^N - Initial Investment

The key part of this formula is the “discount rate” in the denominator—reflecting how much the value of money decreases over time.

) Practical Example: Project with Positive NPV

Imagine a company invests $10,000 to start a project, expecting to generate $4,000 in cash flow annually for 5 years, with a discount rate of 10%.

Calculating the present value annually:

• Year 1: 4,000 ÷ 1.1^1 = 3,636.36 USD
• Year 2: 4,000 ÷ 1.1^2 = 3,305.79 USD
• Year 3: 4,000 ÷ 1.1^3 = 3,005.26 USD
• Year 4: 4,000 ÷ 1.1^4 = 2,732.06 USD
• Year 5: 4,000 ÷ 1.1^5 = 2,483.02 USD

Total present value = 15,162.49 USD
NPV = 15,162.49 - 10,000 = 5,162.49 USD

Conclusion: This is a good investment because the NPV is positive.

) Negative Example: What Does a Negative NPV Mean?

Consider purchasing a fixed deposit (CD): invest $5,000, and after 3 years, receive $6,000, with an annual interest rate of 8%.

Present value after 3 years = 6,000 ÷ 1.08^3 = 4,774.84 USD
NPV = 4,774.84 - 5,000 = -225.16 USD

This indicates the investment is not worthwhile—the future gains do not compensate for the current investment.

Choosing a Reasonable Discount Rate

The most challenging part of NPV calculation is determining the discount rate. It’s not an objective number but based on investor judgment.

Some approaches to selecting the discount rate:

Opportunity Cost Method: How much could I earn if I invested elsewhere?
If alternative options are less risky with an 8% return, but this project is riskier, I might require at least a 12% return.

Risk-Free Rate Method: Start with the yield on government bonds (often called the risk-free rate), then add a risk premium based on the project’s risk level.

Industry Benchmark Method: Look at what similar projects in the same industry typically use as a discount rate.

Investor Experience: Ultimately, investor intuition and past experience are also important.

Limitations of NPV

While NPV is a powerful evaluation tool, it has obvious limitations:

Despite these drawbacks, NPV remains the most commonly used tool by businesses and investment institutions because it is easy to understand, relatively simple to operate, and directly expresses investment value in monetary terms.

IRR: Telling the Story of Return in Percentage

If NPV uses the “how much money” mindset, IRR (Internal Rate of Return) uses the “what percentage” mindset.

Essentially, IRR is the discount rate that makes the project’s NPV exactly zero. In other words, it represents the annualized return of the investment.

IRR is expressed as a percentage, making it easy to compare with other investment opportunities. An IRR of 15% means the project’s annual return is 15%. Investors often compare IRR with a benchmark rate (like government bond yields or the company’s cost of capital) to decide whether the project is worthwhile.

( Practical Value of IRR

The biggest advantage of IRR is relativity—it provides a percentage metric that easily compares projects of different scales and durations. A project with an 18% IRR and another with 12% IRR—clearly, the former is more attractive.

IRR also has significant issues.

Challenges of IRR

When NPV and IRR Give Conflicting Signals

In practice, it’s common to encounter situations where a project has a high NPV but a relatively low IRR; or vice versa. Why?

The main reason is that they measure different things. NPV reflects absolute monetary value, while IRR reflects relative percentage return.

Example:

• Project A: initial investment of $1,000,000, NPV = $500,000, IRR = 8%
• Project B: initial investment of $100,000, NPV = $30,000, IRR = 15%

Based on NPV, Project A is better ($500,000 > $30,000); based on IRR, Project B is better (15% > 8%).

In such conflicting cases, investors need to consider their goals. If the goal is maximizing absolute profit, choose NPV; if the goal is maximizing efficiency and capital return, choose IRR. Usually, both indicators should be used together.

How to Choose Between NPV and IRR

When the two indicators give conflicting signals, the recommended approach is:

1. Re-examine key assumptions

• Is the discount rate used reasonable?
• Are the cash flow forecasts based on reliable data?
• Are there hidden costs or revenues?

2. Consider project scale and duration

• Small-scale but high-return projects (high IRR) may be less attractive than large-scale projects (high NPV)
• Long-term projects tend to have higher IRRs, which can be misleading

3. Assess risk and flexibility

• Can the project’s cash flows be realized as expected?
• Is there room for adjustments during execution?

4. Use other metrics in conjunction

• Payback Period: how long to recover the initial investment?
• ROI (Return on Investment): total return relative to investment
• Profitability Index (PI): return per unit of investment

A Complete Framework for Investment Selection

To make sound investment decisions, relying solely on NPV or IRR is insufficient. The recommended process is:

1. Initial Screening: Use IRR to quickly eliminate obviously unprofitable projects (IRR below minimum acceptable rate)
2. In-Depth Evaluation: Use NPV to compare the absolute value of qualified projects
3. Risk Assessment: Consider cash flow stability and project feasibility
4. Holistic Decision: Incorporate company strategy, funding availability, market outlook, etc.

Frequently Asked Questions

Q1: Besides NPV and IRR, what other important metrics are there?
A: ROI (Return on Investment), Payback Period, Profitability Index (PI), and WACC (Weighted Average Cost of Capital). Each has its focus; combining them improves decision quality.

Q2: Why use both NPV and IRR?
A: Because they evaluate investments from different perspectives. NPV tells you how much money you can earn, IRR shows how efficient the investment is. Using both provides a more comprehensive view.

Q3: What if a project’s NPV and IRR give completely opposite results?
A: Then it’s necessary to scrutinize underlying assumptions, especially the discount rate. Adjust the rate to see how results change, or verify cash flow forecasts with other methods.

Q4: Should investors prioritize NPV or IRR?
A: It depends on their goals. For maximum profit, look at NPV; for highest efficiency, look at IRR. Ideally, consider both along with risk factors.

Final Recommendations

NPV and IRR are two pillars of investment analysis, both based on forecasts of the future. In reality, all forecasts contain errors. Therefore, before making decisions, investors should:

• Conduct sensitivity analysis to see how results change with assumptions
• Avoid over-reliance on a single metric or model
• Consider strategic value, not just financial numbers
• Ensure sufficient funds to handle unforeseen events
• Regularly review investment performance against expectations

Investment fundamentally involves making optimal judgments amid uncertainty. NPV and IRR are tools for rational analysis, but success in practice also depends on experience, intuition, and prudent risk management.