Why Your Mutual Fund XIRR Can Fall Even When the Market Rises

Your fund's value is at an all-time high, the market is up, and yet your XIRR has dropped, say from 14% to 13%. It looks like something went wrong. Usually, nothing has. Here is why that number can fall while your money grows.

What XIRR in Mutual Fund Measures

XIRR is the annualised return on your own cash flows, how much you invested, how much you withdrew, and the exact dates each happened.

That date part is the point. A fund has one NAV (Net Asset Value, the per-unit price, recalculated at the end of each trading day). But two people in the same fund can have very different XIRRs, because they put in different amounts on different days. The NAV belongs to the fund. The XIRR belongs to you.

It differs from CAGR (Compound Annual Growth Rate), which assumes a single investment left untouched. A SIP (Systematic Investment Plan, a fixed amount invested at regular intervals) is many investments on many dates, so CAGR cannot describe it. XIRR can. That makes XIRR the right number for almost every real investor.

Why Value Can Rise While XIRR Falls

The key is that XIRR is a rate, not an amount. It measures how fast your money has grown per year, while your portfolio value just measures how much money you have. The two can move apart.

A rate falls whenever a recent stretch earns less than your historical average. If your money had been compounding at 14% a year, and then the market rises just 3% over six months, about 6% a year, that slow stretch drags your annualised return down, even though the market went up and your value is higher. The market rose, but it rose more slowly than in your own history. That is the real cause, and the situations below are all versions of it.

The most common case: a slow stretch, often right after you add money

Meera invested ₹5,00,000 five years ago. It grew to ₹9,63,053, an XIRR of about 14%. She then invests a ₹4,00,000 bonus, and over the next six months, the market rises 3%.

Her portfolio is worth ₹40,892 more; the market went up, and her XIRR still fell.

What is actually driving this: the market rose, but only 3% in six months, about 6% a year, well below the 14% her earlier money had been compounding at. That below-average stretch is the real cause. It would have pulled her XIRR down to roughly 13.3% even if she had added nothing at all. Her ₹4,00,000 bonus then deepens the dip slightly, to 13.0%, because that money has only ever lived through the slow stretch.

The new money does not lower her XIRR on its own. Had the ₹4,00,000 earned her usual 14%, her XIRR would have stayed at 14%. So the driver is the market rising slower than her history; the fresh money only sharpens the effect by putting more of her portfolio through that slow patch. The same thing happens to a plain SIP whenever a fast period in the market slows to an ordinary one, recent instalments earn below the old average, so the rate dips.

The Time Effect

This one needs no new money. Suppose you invest ₹1,00,000 once. In the first year it gains 30%, reaching ₹1,30,000. In the second year it gains an ordinary 9%, reaching ₹1,41,700.

Your wealth rose, but the annualised figure fell from 30% to 19%. A 30% gain looks very high spread over one year; spread the total growth over two years and the per-year average comes down, because the second year was calmer. With a single investment, XIRR and CAGR are the same number.

What this Clears up

Value and XIRR are not the same signal. Value is the size of your money; XIRR is the yearly rate it grew at, adjusted for timing. They can move apart by design.

A falling XIRR does not automatically mean your fund is underperforming. In every case above, the fund was fine, the XIRR moved because a recent stretch returned less than the earlier average, not because the fund made a mistake.

And checking XIRR weekly tells you little. It is a multi-year measure; over days, it just wobbles with the market and with any money you have added.

Things to Keep in Mind

A dip is usually harmless, but look closer if:

• Your fund is consistently behind its benchmark over three to five years. That is a fundamental problem, separate from your cash flows.
• The return stays low for a long time, not just a few months. A brief below-average stretch is normal; a long flat run is worth examining.
• Your asset allocation no longer fits your goal.

So the rule is not "ignore your XIRR." It is: understand why it moved before reacting. A dip after a fast market calms to an ordinary pace and needs no action. A steady gap against the benchmark over the years does. The figures here are rounded to show the effect; every real portfolio differs.

In Short

XIRR is the yearly rate your own money grew at, counting how much you invested and when. Whenever a recent stretch earns less than your earlier average, a market that rises slowly, or a strong run that cools off your XIRR can fall while your value keeps rising. Most of the time, that is just the math working, not a signal to change anything.