Net Internal Rate of Return (Net IRR) is an important metric used to measure the financial performance of investments and projects. It is an effective tool for investors or managers to make well-informed decisions on whether they should pursue a particular project or invest in a particular business.

Net IRR is an extension of the traditional Internal Rate of Return (IRR), and is used to gauge the performance of a project or investment based on its discounted future cash flows. It is a valuable tool for investors and managers to calculate the rate of return expected from a project after taking into account factors such as fees, costs, carried interest and other deductions. This helps to give investors or managers a more accurate picture of an investment's actualized potential.

The calculation may be carried out using Excel or other software programs, although if the project is more complex calculations should be carried out using net present value (NPV) techniques. Generally, an investment should be undertaken if its Net IRR is greater than the required rate of return.

Net IRR allows investors and managers to identify projects or investments with greater potential returns and helps them to minimize their exposure to potential risk. This is because it provides a more accurate picture of the project or investment's true earnings than traditional IRR. It is particularly useful for investments involving multiple cash flows of various amounts and timing as Net IRR takes into account the effect of fees and costs.

Overall, Net IRR is a valuable tool for investors and managers to accurately measure the financial performance of investments and projects. By factoring in relevant costs and fees, Net IRR helps to give investors and managers an accurate view of an investment's true potential. By utilizing this metric, investors and managers can make well-informed decisions when it comes to investing or undertaking a project.