VAN vs IRR: Which is the correct metric to evaluate your investments?

When it comes to making investment decisions, numbers don’t lie. But here’s the problem: two key metrics, Net Present Value (NPV) and Internal Rate of Return (IRR), often give us conflicting signals. A project may look promising according to the NPV, but disappointing under the IRR perspective. This creates genuine doubts among individual and professional investors: which one to trust? Do they complement each other or contradict? In this guide, we will unravel the mysteries of NPV and IRR so you can build a more robust investment evaluation strategy.

NPV and IRR: Two different perspectives on the same problem

Net Present Value (NPV) answers a fundamental question: How much real money will I earn or lose with this investment? It is an absolute measure, expressed in currency.

The Internal Rate of Return (IRR), on the other hand, answers another: What percentage return do I expect to achieve? It is a relative measure, expressed as a rate.

This fundamental difference is crucial. While NPV tells you the net value you will generate, IRR indicates the percentage efficiency of your capital. Both are necessary, but each tells a different story about your investment’s profitability.

Breaking down the NPV: The real value of your future gains

Net Present Value is, essentially, the money you’ll have tomorrow, evaluated with today’s purchasing power.

The logic is simple: cash flows you will receive in the future are worth less than the money in your pocket now because they lose value due to inflation and because you could invest that money elsewhere. NPV compensates for this effect by bringing all future cash flows to the present, subtracting the initial investment.

NPV calculation follows this structure:

NPV = (Cash Flow Year 1 / ((1 + Discount Rate)¹) + )Cash Flow Year 2 / ((1 + Discount Rate)²( + … + )Cash Flow Year N / )(1 + Discount Rate)ⁿ( - Initial Investment

Where:

• Cash Flow: money you expect to receive each year
• Discount Rate: the minimum return you require (varies with risk)
• Initial Investment: what you spend today

Simple interpretation:

• Positive NPV = expected net gains )good investment(
• Negative NPV = expected losses )bad investment(
• Zero NPV = break-even

) Practical example: Positive NPV in a business project

Imagine a company invests $10,000 in a project that will generate $4,000 each year for 5 years. The discount rate is 10%.

Calculating the present value of each year:

• Year 1: 4,000 / 1.10 = $3,636.36
• Year 2: 4,000 / 1.21 = $3,305.79
• Year 3: 4,000 / 1.331 = $3,005.26
• Year 4: 4,000 / 1.4641 = $2,732.06
• Year 5: 4,000 / 1.6105 = $2,483.02

Total NPV = (3,636.36 + 3,305.79 + 3,005.26 + 2,732.06 + 2,483.02) - 10,000 = $2,162.49

Result: The investment generates net gains. The project is viable.

Practical example: Negative NPV in a financial instrument

Consider a $5,000 Certificate of Deposit (CD) that will pay $6,000 in 3 years, with an 8% interest rate.

Present value of future payment: 6,000 / ###1.08(³ = $4,774.84

NPV = $4,774.84 - $5,000 = -$225.16

Result: The investment results in losses. Not advisable under these conditions.

The Discount Rate: The critical factor we often underestimate

Here’s the important part: the discount rate is subjective. It’s not a number that falls from the sky. You, as an investor, must determine it.

The best approach is to ask yourself: What is the minimum return I need to justify this risk?

Several approaches can help:

Opportunity Cost: What return could I get if I invested in something similar? If your options yield 8%, that should be your baseline rate.

Risk-Free Rate: Government bonds are the starting point. If they offer 3% risk-free, any riskier investment should outperform that.

Sector Analysis: Research what discount rates similar companies use to evaluate comparable projects.

Your Experience: Sometimes, intuition backed by years of analysis is valuable. But don’t use it as an excuse to skip rigorous analysis.

The limitations of NPV you should know

Although NPV is a powerful tool, it has vulnerabilities:

Despite these limitations, NPV remains the favorite because it is clear, relatively simple to calculate, and provides a real monetary answer, not an abstract percentage.

IRR: The rate that balances everything

IRR is the breakeven point. It is the discount rate that makes NPV exactly zero.

In practical terms: it’s the actual return you expect to earn from your investment.

If IRR is higher than your discount rate )or hurdle rate(, the project is profitable. If lower, it’s not.

Why is it useful: IRR is especially valuable for comparing projects of different sizes. A small project with 25% IRR is more efficient than a large one with 15%, even if the latter has a higher NPV.

The real problems of IRR that few mention

Here’s where things get complicated:

1. Multiple IRRs )or none( If your cash flows change direction multiple times )positive, negative, positive again(, the calculation can yield multiple IRRs. Which one do you use? Total confusion.

2. Non-conventional cash flows IRR assumes you invest money upfront and then receive positive flows. If patterns are erratic, IRR can mislead you completely.

3. Reinvestment problem IRR assumes you reinvest your gains at the same IRR. In reality, the reinvestment rate can be very different, overestimating your actual profitability.

4. Does not properly capture the time value of money Although technically it does, it doesn’t always reflect future inflation adequately.

NPV vs IRR: When indicators contradict each other

Here’s the crux: what do you do when NPV says “yes” but IRR says “no”?

Example of contradiction:

• Project A: NPV of $5,000, IRR of 8%
• Project B: NPV of $3,000, IRR of 20%

Which do you choose? It depends on your context:

If capital is limited and you want to maximize efficiency, Project B )higher IRR( is better.

If you have abundant capital and seek absolute gains, Project A )higher NPV( is preferable.

Practical recommendation: When contradictions arise, review your assumptions. Especially:

• Is the discount rate truly reflecting risk?
• Are the projected cash flows realistic?
• Are there non-conventional flows distorting IRR?

In most cases, adjusting the discount rate in NPV resolves the apparent contradiction.

The true strategy: Use both metrics together

Here’s the conclusion that textbooks avoid: NPV and IRR are not competitors, they are companions.

NPV tells you how much money you expect to earn. IRR tells you what efficiency you will achieve. Both answers matter.

A good investment decision requires:

1. Positive NPV )you will generate real gains(
2. IRR above your discount rate )it will be profitable(
3. Comparison with alternatives )is there something better?(
4. Sensitivity analysis )what if your assumptions change?(
5. Consideration of other factors )risk, liquidity, alignment with objectives(

Additionally, complement with metrics like ROI )Return on Investment(, Payback Period )recovery time(, and Weighted Average Cost of Capital )WACC( for a complete picture.

Frequently asked questions about NPV and IRR

Which indicators are better than NPV and IRR? None are “better” in absolute terms. ROI, Payback Period, and Profitability Index complement the analysis, but NPV remains the most rigorous metric.

Why do professionals use NPV and IRR together? Because each captures a different dimension. NPV measures absolute value, IRR measures efficiency. Together, they provide a comprehensive assessment.

How does changing the discount rate affect them? Dramatically. A higher rate reduces both NPV and IRR, while a lower rate increases them. That’s why choosing the right rate is crucial.

How do I decide between multiple projects? Choose the one with the higher NPV if capital is abundant, or higher IRR if capital is limited. Ideally, look for projects excelling in both metrics.

Conclusion: Your roadmap to smarter investment decisions

NPV and IRR are powerful tools, but they are not crystal balls. Both depend on assumptions about the future that always include uncertainty.

True mastery lies in:

• Understanding what each measures
• Calculating them accurately with realistic data
• Interpreting them in the context of your specific situation
• Using them to inform your decision, not replace your judgment

Finally, remember that investing is not just mathematics. Your personal goals, risk tolerance, time horizon, and diversification strategy also matter. Use NPV and IRR as a compass, not as the final destination.