Internal Rate of Return (IRR) (2024)

How to Calculate IRR

The higher the IRR, the more profitable a potential investment will likely be if undertaken all else being equal

The internal rate of return (IRR) metric estimates the annualized rate of return that an investment is going to yield.

Unlike the MoM, the IRR is considered to be “time-weighted” because it accounts for the specific dates that the cash proceeds are received.

The calculation of the IRR involves the following steps:

1. Step 1 → The future value (FV) is divided by the present value (PV)
2. Step 2→ The amount is raised to the inverse power of the number of periods (i.e., 1 ÷ n)
3. Step 3→ From the resulting figure, one is subtracted

IRR Formula

The formula for calculating the internal rate of return (IRR) is as follows:

Formula

• IRR = (Future Value ÷ Present Value)^(1 ÷ Number of Periods) – 1

Conceptually, the IRR can also be thought of as the rate of return wherein the NPV of the project or investment equals zero.

The alternative formulas, most often taught in academia, involve backing out the IRR for the equation to hold true (and require using a financial calculator).

Formula

• 0 = CF t = 0 + [CF t = 1 ÷ (1 + IRR)] + [CF t = 2 ÷ (1 + IRR)^2] + … + [CF t = n ÷ (1 + IRR)^n]

Or:

• 0 = NPV Σ CFn ÷ (1 + IRR)^n

How to Calculate IRR in Excel

XIRR vs. IRR Function

The XIRR Excel function is preferable over the IRR function as it has more flexibility by not being restricted to annual periods. The drawback to the IRR function is that Excel assumes each cell is separated by precisely twelve months, which is not always the case.

Under XIRR, daily compounding is assumed, and the effective annual rate is returned. But for the IRR function, the interest rate is returned assuming a stream of equally spaced cash flows.

The XIRR function can handle complex scenarios that necessitate taking into account the timing of each cash inflow and outflow (i.e., the volatility of multiple cash flows).

Pitfalls of IRR in Returns Analysis

The internal rate of return (IRR) metric is imperfect and cannot be used as a standalone measure due to being very sensitive to timing.

For example, if a private equity firm were to issue itself a dividend soon after a leveraged buyout (LBO), this would increase the IRR to the fund regardless of whether the multiple-of-money (MoM) meets the required returns hurdles – which causes the IRR to be potentially misleading as a result.

However, the IRR could potentially be misleading in its portrayal of returns.

For instance, a high IRR calculated during a short holding period can be artificially inflated and be unsustainable if the holding period were to be extended longer – and thus, IRR cannot be singularly used to make an investment decision.

Let’s say an investment would yield a 30% IRR if sold on the present date, which at first glance sounds great.

But from a more in-depth look, if the same investment achieves only 1.5x MoM, this makes the return far less impressive, and the high IRR is attributed more towards a quicker return of capital rather than substantial growth in the size of the investment.

Nonetheless, the IRR tends to be the most benchmarked marketing metric for the performance of investment funds.

For this reason, most firms pay a significant amount of attention to their fund’s IRR.

Levers of IRR Levers – Positive and Negative Drivers

The following factors are the main contributors which drive the internal rate of return (IRR):

Regardless, the internal rate of return (IRR) and MoM are both different pieces of the same puzzle, and each comes with its respective shortcomings.

The takeaway is that the magnitude by which an investment grows matters, but the pace at which the growth was achieved is just as important.

IRR Calculator – Excel Template

We’ll now move to an internal rate of return (IRR) modeling exercise, which you can access by filling out the form below.

IRR Calculation Example

Suppose a private equity firm made an equity investment of $85 million in 2022 (Year 0).

• Year 0 = –$85 million Cash Outflow

The value of the initial investment stays unchanged regardless of which year the firm exits the investment.

Since the investment represents an outflow of cash, we’ll place a negative sign in front of the figure in Excel.

Afterward, the positive cash inflows related to the exit represent the proceeds distributed to the investor following the sale of the investment (i.e. realization at exit).

Here, our simple assumption is that the exit proceeds will increase by a fixed amount of $25 million each year, starting from the initial investment amount of $85 million.

• Annual Growth in Sponsor Proceeds ($) = +$25 million per Year

Therefore, the exit proceeds in Year 1 are $110 million while in Year 3, the proceeds come out to $160 million.

Once our table depicting the cash outflow in Year 0 (the initial investment) and the cash inflows (the exit proceeds) at different dates in the holding period is done, we can calculate the IRR and MoM metrics from this particular investment.

To determine the internal rate of return of an investment, follow the steps below.

• Step 1 → Start by listing out the value of all of the cash inflows/(outflows) and the corresponding dates of the date of receipt
• Step 2 → Use the XIRR Excel function (“= XIRR (Range of CFs, Range of Timing)”); the first input requires you to drag the selection box across the range of cash inflows/(outflows)
• Step 3 → For the second input, do the same across all of the corresponding dates.

To reiterate from earlier, the initial cash outflow (i.e. sponsor’s equity contribution at purchase) must be entered as a negative number since the investment is an “outflow” of cash.

Note that for the formula to work and be dragged down, the date selection must be anchored in Excel.

In order to calculate the multiple-on-money (MoM), we’ll calculate the sum of all the positive cash inflows from each holding period.

We must then divide that amount by the cash outflow in Year 0.

For instance, assuming a Year 5 exit, the exit proceeds of $210 million are divided by -$85 million to get an MoM of 2.5x.

• MoM = $210 million ÷ ($85 million) = 2.5x

Based on the completed output for our exercise, we can see the implied Year 5 IRR is 19.8% whereas the MoM is 2.5x.

• Exit Year 5 IRR = 19.8%

If we were to calculate the IRR using a calculator, the formula would take the future value ($210 million) and divide by the present value (-$85 million) and raise it to the inverse number of periods (1 ÷ 5 Years), and then subtract out one – which again gets us 19.8% for the Year 5 internal rate of return (IRR).