Portfolio Turnover Ratio: How Busy Is Your Fund Manager?

Every equity fund factsheet throws a dozen numbers at you. Most people read the returns, glance at the expense ratio and stop there. The portfolio turnover ratio usually sits further down, in small print, and it gets skipped. That’s a pity, because it answers a question nobody else on the page does: how much is the fund manager actually trading your money?

A fund that holds the same 40 stocks for years and one that churns half its book every few months can show similar returns in a good year. They are not the same product. One is a patient owner of businesses. The other is closer to an active trader with your savings. The turnover number is the quickest way to tell them apart.

What the portfolio turnover ratio measures

In plain terms, turnover tells you what share of a portfolio was swapped out over a year. Investopedia describes it as the percentage of a mutual fund’s or other portfolio’s holdings that were replaced in the course of one year. A fund at 20% replaced roughly a fifth of its holdings by value. A fund at 100% traded an amount equal to its whole portfolio.

That last line needs a caveat, and Investopedia makes it too: a ratio above 100% does not necessarily mean every single holding was replaced. A manager could keep half the portfolio untouched and trade the other half in and out several times. The ratio measures the volume of trading relative to the fund’s size, not the number of stocks that changed.

The formula SEBI uses for mutual funds

Indian mutual funds don’t get to pick their own definition. SEBI’s formats for mutual funds (as on March 31, 2020) include a “Key Statistics” table in the abridged scheme-wise annual report, and its note defines it like this:

Portfolio turnover = lower of sales or purchases ÷ average AUM for the year or period

The same note defines average AUM as the average daily net assets. So you take everything the fund bought during the period, everything it sold, pick whichever is smaller, and divide it by the fund’s average size.

Fund houses publish their methodology for this. Zerodha Fund House’s calculation methodology note, for instance, spells out a few working details:

• The period considered is the last one year.
• TREPS, CBLO, repo, FDs, margin FDs, MFU and SLB transactions are not counted as purchases or sales.
• Fixed income securities and equity derivatives are included.
• The ratio is marked as not applicable to passive funds.

The exclusions matter. Funds park idle cash in overnight instruments like TREPS, a point the same note makes elsewhere. If those rolls counted, every fund would look hyperactive. Leaving them out keeps the number focused on actual investment decisions.

Why “lower of” purchases or sales?

This is the part most explainers skip, and it’s the clever bit. A mutual fund doesn’t only trade because the manager changed their mind. It also trades because money walks in and out.

Think about a popular small-cap fund during a year when SIP money keeps pouring in. The manager has to buy shares with that cash whether or not they want to change anything. Purchases balloon. Sales stay modest. If you divided purchases by AUM, the fund would look like a hyperactive trader when it’s really just deploying fresh money.

Now flip it. A fund facing heavy redemptions has to sell to pay investors out. Sales jump. Purchases stay low. Again, that’s not the manager’s choice.

Taking the smaller of the two strips out most of that flow-driven noise. When a manager genuinely switches, selling stock A to buy stock B, both sides of the ledger move together, so the smaller figure captures the real repositioning.

Turnover isn’t a measure of how many stocks changed. It’s a measure of how much trading happened compared with the size of the fund, and the “lower of” rule keeps investor flows from muddying it.

Interestingly, SEBI uses a different convention elsewhere. In the monthly report format for portfolio managers, the transaction data table defines the portfolio turnover ratio as the higher of purchases or sales in the month divided by average AUM, with average AUM computed on a daily average. So if you’re comparing a PMS turnover number with a mutual fund’s, check which definition each one uses before drawing conclusions. They aren’t built the same way.

A worked example in rupees

Let’s run the numbers on three made-up equity funds. All three have an average AUM of ₹2,000 crore over the past year. These are hypothetical figures, used only to show the arithmetic.

Look at Fund B. If someone had used purchases alone, it would show 1,800 ÷ 2,000, or 90%. That makes the manager look busy when most of the buying was simply putting new SIP and lump-sum money to work. The SEBI formula reports 20%, which is closer to what the manager actually chose to change.

Fund C is the mirror image. Selling ₹1,000 crore to meet redemptions isn’t a call on the market. The ratio comes out at 15% because only ₹300 crore of buying happened.

And Fund A? It bought and sold in similar amounts, which is what active repositioning looks like. Its 55% means the manager traded a little over half the fund’s average size during the year.

What that trading can cost you

Here’s where the number stops being academic. Every trade has a cost: brokerage, taxes and charges on the transaction, and the price impact of moving size in and out of stocks. Investopedia points out that high turnover tends to raise a fund’s costs through spreads and commissions, and that those costs are passed on to investors and show up in the fund’s overall return. SEBI’s format for the Scheme Information Document makes a similar point: it asks funds to disclose their portfolio turnover policy, particularly for equity schemes, and to discuss consequences of higher turnover, giving higher brokerage and transaction cost as the example.

Let’s put a rough figure on it, again with an assumption we’re making up purely for illustration. Suppose every ₹100 traded costs a fund 10 paise all-in, or 0.10%.

• A fund with 150% turnover that buys and sells in roughly equal amounts trades about ₹3,000 crore each way on a ₹2,000 crore book. That’s ₹6,000 crore of trades. At 0.10%, the cost is ₹6 crore, or 0.30% of the fund’s average assets.
• A fund at 30% turnover trades about ₹600 crore each way, or ₹1,200 crore in total. Cost: ₹1.2 crore, or 0.06% of average assets.

The gap here is 0.24 percentage points a year, under our assumed cost. That drag sits on top of the expense ratio you already pay, and because it’s absorbed inside the portfolio, it never appears as a separate line item. Your actual trading costs will depend on the stocks traded and how liquid they are. The point is the direction: more churn, more friction.

How to read the number without over-reading it

Investopedia offers a rough yardstick: a turnover of 20% to 30% is typically considered low, and 100% or more is considered high. That guide is written mostly with US funds in mind, so treat it as a starting point rather than a rule.

The more useful comparison is against similar funds. Investopedia makes that point well. Turnover varies with a fund’s type, objective and the manager’s style. An index fund replicates its benchmark and only trades when the index changes, so its turnover stays low. An aggressive small-cap growth fund will generally turn over more than a large-cap value fund.

So a few practical checks we’d suggest:

• Compare within a category. A flexi-cap fund’s turnover should be judged against other flexi-cap funds, not against a large-cap index fund.
• Watch for sudden jumps. If a fund that usually runs at 30% suddenly prints 120%, something changed. A new fund manager reshaping the old portfolio could be one reason. A change in the scheme’s objective could be another. Either way, it’s worth reading the fund’s commentary.
• Match it to the stated style. A fund that markets itself as a long-term, buy-and-hold quality portfolio but shows high turnover year after year isn’t doing what it says on the tin.
• Don’t treat low as automatically good. Investopedia is explicit that a high ratio isn’t necessarily bad and a low one isn’t necessarily good. A manager who trades a lot and consistently beats the benchmark after costs has earned that churn. A manager who barely trades but lags the index hasn’t earned much praise either.

Turnover also pairs well with another quirk of fund reporting. A portfolio snapshot shows what the fund held on one day. A fund with high turnover may look quite different a few weeks later. If you’ve read about window dressing in mutual funds, you’ll see why it helps to know how actively a portfolio moves between those snapshots.

Where to find the portfolio turnover ratio for an Indian fund

SEBI has required this disclosure for a long time. A SEBI circular dated September 19, 2002 told mutual funds that, for equity-oriented schemes, the portfolio turnover ratio should be disclosed as a footnote in their half-yearly portfolio disclosures. The same SEBI formats document repeats that requirement for equity-oriented schemes, and the abridged annual report carries it in the key statistics table for each scheme, alongside the previous year’s figure.

So you have at least three places to look:

• The scheme’s half-yearly portfolio disclosure, as a footnote, for equity-oriented schemes.
• The abridged scheme-wise annual report, in the key statistics table.
• The Scheme Information Document, which should discuss the fund’s turnover policy and the effect its strategy may have on turnover.

The annual report is handy because it shows the current and previous year side by side. One year of data tells you very little. Two or three years tell you whether the manager has a consistent habit.

Things the ratio won’t tell you

• It doesn’t show which stocks moved. A 50% turnover could be a full rotation out of banks into IT, or the same few names being trimmed and topped up repeatedly.
• It’s backward-looking. It covers the last one year. A new manager may already be running the fund very differently.
• Definitions vary across products. Mutual funds use the lower of purchases or sales. SEBI’s monthly PMS report format uses the higher, measured monthly. A mismatch here can make two similar strategies look very different.
• It isn’t reported for passive funds in at least some fund houses’ methodology, as the Zerodha Fund House note shows, so don’t expect a number for every scheme.

The quick takeaway

The portfolio turnover ratio is a one-line answer to a simple question: how much does this fund trade relative to its size? In India, mutual funds calculate it as the lower of purchases or sales over the year, divided by average daily net assets, which keeps investor inflows and redemptions from distorting it. Use it to compare funds in the same category, to check a manager’s behaviour against the fund’s stated style, and to spot sudden changes. Pair it with the expense ratio and the plan you hold (our note on direct vs regular mutual funds covers that part), and you get a much clearer picture of what you’re really paying for.

And if you think about your own investing in terms of risk and costs, our guide to risk management in trading covers the same discipline from the trader’s side.

Disclaimer: This article is for education only and is not investment advice. The funds, figures and cost assumption in the worked example are hypothetical. Mutual fund investments are subject to market risks; read all scheme-related documents carefully and consult a SEBI-registered adviser before making investment decisions.