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NPV & IRR are related by an equation. IRR is the rate at which NPV is 0.
When you have two mutually exclusive project (where acceptance of one project means rejection of other project) and both NPV and IRR give conflicting results, we should use NPV method to determine which project add more value to the business.
Hence NPV is more reliable when you have mutually exclusive projects and both the methods give conflicting results.
In case of Independent projects, any method can be used. Criteria for NPV method is -
Accept if NPV > 0 , Reject if NPV <= 0
Criteria for IRR method is -
Accept if IRR > Cost of Capital, Reject if IRR <= Cost of Capital
IRR and NPV are both methods primarily use in forecasting capital budgeting.