How Are AIF Returns Calculated? Understanding XIRR vs CAGR

Most investors judge a fund by one number: the return it has generated. But with alternative investment funds, that number depends entirely on which formula was used to arrive at it, and the two most common ones, XIRR and CAGR, can tell very different stories about the same fund.

XIRR (Extended Internal Rate of Return) calculates annualized return for cash flows that occur at irregular dates. CAGR (Compound Annual Growth Rate) calculates annualized return assuming a single lump sum invested at the start and withdrawn at the end. The distinction matters more in AIFs than almost anywhere else in the investing world.

Why Don't AIFs Behave Like a Lump-Sum Investment?

A mutual fund SIP has one entry pattern. A stock purchase has one entry date and, usually, one exit. An AIF has neither.

When an investor commits ₹1 crore to a Category I AIF, that money isn't deployed on day one. It moves in tranches, called capital calls, spread across 18 to 36 months as the fund manager identifies and closes deals. Returns come back the same way: partial exits, dividend distributions, and final proceeds arrive at different points across the fund's life, not as one lump sum at maturity.

This is precisely the kind of cash flow pattern CAGR was never built to handle.

CAGR = (Ending Value / Beginning Value)^(1/n) − 1

where n is the number of years.

CAGR works cleanly when there's one investment date and one exit date. Buy a stock at ₹100, sell it three years later at ₹150, and CAGR tells you the fund grew at roughly 14.5% a year. Clean, accurate, done.

Apply the same formula to an AIF, and it falls apart. If an investor's ₹1 crore commitment was drawn down as ₹25 lakh in year one, ₹40 lakh in year two, and ₹35 lakh in year three, CAGR has no way to account for the fact that some of that capital was working for three years while some was working for barely a few months. 

It treats the entire ₹1 crore as if it were invested on day one, which understates the fund's actual efficiency at deploying and returning capital. Take a stock trade: buy at ₹100, sell three years later at ₹150, and CAGR puts the annual growth at roughly 14.5%. One entry, one exit, nothing complicated about it.

An AIF doesn't play by those rules. XIRR, or Extended Internal Rate of Return, works out annualized return for cash flows landing on irregular dates. CAGR, or Compound Annual Growth Rate, assumes something simpler: one lump sum going in at the start and one coming out at the end. It treats the full ₹1 crore as though it all went in on day one, and in doing so, quietly understates how efficiently the fund actually deployed and returned money.

XIRR solves this by treating every capital call as a cash outflow and every distribution as a cash inflow, each tagged with its actual date.XIRR closes that gap by treating every capital call as money going out and every distribution as money coming back, each one dated to when it actually happened. It then computes the single annualized rate that makes the net present value of all these cash flows equal to zero.

There's no clean algebraic formula for XIRR the way there is for CAGR. It's solved iteratively, which is why every AIF factsheet, fund administrator platform, and even a basic spreadsheet calculates it rather than deriving it by hand.

A Working Example

Consider an investor with the following cash flow pattern in a Category I AIF:

Total invested: ₹1 crore. Total returned: ₹1.55 crore. A simple "1.55x return" headline sounds identical whether that money took two years or five years to come back, and that's exactly the gap XIRR closes. Running these five dated cash flows through XIRR gives an annualized return that accounts for exactly how long each rupee was actually deployed, typically landing meaningfully higher than what a naive CAGR-style calculation on total invested versus total returned would suggest, because the later capital calls had far less time to compound before the fund started returning money.

CAGR undervalues funds that deploy capital efficiently and return it early. A fund that calls capital slowly and distributes early will show a modest CAGR despite strong actual performance, because CAGR doesn't reward speed of deployment or early liquidity.

XIRR captures this correctly. It's also why two AIFs with identical total returns (say, both turning ₹1 crore into ₹1.8 crore) can post very different XIRR figures depending on how front-loaded or back-loaded their capital calls and distributions were.

This is also why fund managers and SEBI-mandated disclosures for AIFs report XIRR, not CAGR, as the standard return metric. It's the only measure that reflects what the investor actually experienced with their money over time.

What Investors Should Actually Check?

A few checks are worth doing before taking any AIF return figure at face value:

• Confirm whether the quoted number is gross XIRR (before fees and carry) or net XIRR (what the investor actually received).
  

• Check whether the XIRR is calculated for the fund as a whole or for a specific investor's actual drawdown schedule, since these can differ

• Be cautious of return figures quoted early in a fund's life, since XIRR on partially deployed, partially realized portfolios can be volatile and unrepresentative of eventual outcomes.

In summary, CAGR works when money moves once in and once out. AIFs rarely work that way. Capital calls are staggered, distributions are staggered, and the only metric built to handle that irregularity is XIRR. Any AIF return figure worth trusting is an XIRR figure, calculated on actual dated cash flows, not a simplified CAGR that treats a multi-year drawdown schedule as if it were a single lump-sum investment.