Where the management has to rank the investments, with the objective of giving priority to the most rewarding ones, the investment with the highest NPV must be ranked first. Calculating Internal Rate of Return (IRR) is another method extensively used in the investment appraisals. IRR is a rate where the cost of investment, cash outflow, is equal to the cash inflows. The proposal with the highest IRR is considered to be the most rewarding one. Payback period is another method utilized in investment appraisal which calculates the time taken by the investment to generate enough cash inflows to recover the initial cost of the investment.Investment appraisal through NPV method and IRR method are both very useful in order to financially attractive prospective of any investment decision. A good financial analysis is based on the trade off between these two methods. However, practically the IRR method is used widely in investment appraisal decision. The prime reason behind selecting the IRR method of appraisal is it is comparatively straight forward and can be used without having a prior experience in capital budgeting. NPV method has certain drawbacks and limitations. Different projects must be assessed at different discount rates because the risk for each project is generally different. The reliability of the NPV based investment appraisal can be as reliable as the discount rate itself. However, in practice, it is very unrealistic to determine different discount rate for different investment proposals. Whereas, IRR uses a single discount rate to evaluate every investment, due to which it is used extensively among the financial analysts.superior to the IRR method. IRR method of appraisal is for evaluating the financial result of an investment over a short period of time. Moreover, IRR is also ineffective for investments proposals which are a mixture of positive and negative cash flow. For these types of investments, the IRR can be more than one. Another factor which makes the NPV method more reliable than the IRR method is the fact that the discount rate changes several time over the period. The IRR method does not incorporate this fact into calculation, and thus is not suitable for long term investment appraisal. In NPV method the discount rate is known and is singular which makes it easier to evaluate the feasibility of the investment. An investment with a negative value represent an
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