CAGR works for one investment. Real life is messier — SIPs every month, a lumpsum here, a partial withdrawal there. XIRR (Extended Internal Rate of Return) is the one number that fairly annualises all of it, and it's what mutual-fund statements use for your personal returns.
Example: invest ₹1 lakh, then ₹50,000 six months later, redeem ₹1.98 lakh after two years — that's a 16.27% XIRR, even though the 'simple' return is 32% over two years. XIRR accounts for when each rupee was invested.
Frequently asked questions
XIRR vs CAGR — which should I use?
CAGR for a single investment held start-to-end. XIRR for anything with multiple cash flows — SIPs, step-ups, partial withdrawals. Your fund statement's 'personal returns' are XIRR.
Why is my SIP XIRR lower than the fund's published CAGR?
In rising markets, later SIP instalments buy at higher NAVs and get less time to compound — so your XIRR trails the fund's since-inception CAGR. That's normal, not a problem.
Can XIRR handle a still-running SIP?
Yes — add your investments so far and use today's date with the current portfolio value as a positive 'redemption'. That gives your XIRR to date.
Why won't it converge?
XIRR needs at least one negative and one positive flow, and sensible dates. All-negative flows (no redemption yet) have no defined XIRR — add a notional current value.
Is XIRR the same as IRR?
XIRR is IRR with exact dates (365-day years). Plain IRR assumes evenly-spaced periods — fine for yearly flows, wrong for SIPs.