Oct 08, 2026 by Offer

Difference between NPV and IRR: Answer Guide 2027

NPV is the present value of a project's cash flows minus the investment, in dollars; IRR is the discount rate where NPV equals zero, in percent. This npv irr interview answer gives the decision rules — NPV > 0 or IRR above the hurdle rate — and explains their conflicts on mutually exclusive projects, where NPV generally wins.

What the Npv Irr Interview Interview Question Tests

Whether you can define both precisely and state the correct decision rule for each.
Whether you know why they conflict: scale, timing, and the reinvestment-rate assumption.
Whether you can say which to trust when they disagree — and why.

How to Answer the Npv Irr Interview Interview Question

How to Answer the NPV IRR Interview Question

Build the comparison in three layers:

Definitions. NPV = Σ CF_t/(1+r)^t − investment: value created in dollars at discount rate r. IRR = the r* where NPV = 0: the project's break-even rate of return.
Decision rules. NPV > 0 → accept. IRR > hurdle rate (usually cost of capital) → accept. For independent projects, both rules agree.
The conflict. Mutually exclusive projects can split the verdict: Project A: invest $1M, IRR 50%, NPV $200k. Project B: invest $10M, IRR 20%, NPV $1.5M. IRR picks A; NPV picks B — and B creates more wealth. Causes: scale differences, timing of cash flows, and IRR's reinvestment assumption.
The verdict. Trust NPV when they conflict; report IRR for intuition. Mention MIRR as the reinvestment-fix if you want bonus points.

The interview line: "NPV tells me how much richer we get; IRR tells me the margin of safety. When they disagree, I follow the money — NPV."

Common Mistakes With the Npv Irr Interview Interview Question

Treating IRR as 'the return' without noting it assumes interim cash flows reinvest at the IRR itself.
Picking the higher IRR among mutually exclusive projects — scale can make the lower-IRR project create more value.
Forgetting multiple IRRs: non-conventional cash flows (sign changes) can produce more than one IRR or none.

NPV vs IRR is the corporate finance interview staple because it tests judgment, not formulas. Candidates who explain the conflict and side with NPV — with reasons — show the maturity interviewers want.

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FAQ

What is the difference between NPV and IRR?

NPV is absolute value created in dollars at a given discount rate; IRR is the break-even discount rate in percent. NPV measures size of value, IRR measures efficiency.

When do NPV and IRR disagree?

On mutually exclusive projects differing in scale or timing: a small high-IRR project can create less value than a large lower-IRR one, and early-vs-late cash flows flip rankings.

Which is better, NPV or IRR?

NPV, for mutually exclusive choices — it measures actual value added. IRR is intuitive for communication but can mislead; use both, trust NPV on conflicts.

What is the reinvestment assumption problem?

IRR implicitly assumes cash flows reinvest at the IRR itself — often unrealistic. NPV reinvests at the discount rate (e.g., cost of capital), which is more defensible.

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