The Little Book of Common Sense Investing · ch 7 of 14
Taxes Are Costs, Too
Active funds trade a lot, and every trade can trigger a tax bill that further shrinks what you keep.
The rule for your portfolio
Prefer low-turnover index funds; they defer tax and keep the taxman from becoming another silent partner.
The quiet third person in your money
Imagine you and a friend agree to look after a small money-plant together. You do all the watering, all the worrying, all the waiting. Your friend does nothing at all. But there's a rule you signed without reading: every single time you snip a leaf to sell it, your friend gets to keep a slice of that leaf. Not because they helped grow it - just because that was the rule. Snip once and they take a little. Snip a hundred times and, leaf by leaf, they walk away with a surprising pile, all for doing nothing.
That silent friend is the taxman, and this chapter is about the truth that almost nobody puts on the poster: when you invest, taxes are not some separate grown-up paperwork thing that happens later. They are a cost - exactly like a fee - and they are one of the biggest costs of all. We spend a lot of energy worrying about the fee a fund charges. We should worry at least as hard about how often our money gets snipped and taxed along the way, because a rupee handed to the taxman early is a rupee that stops growing for you forever.
Here's the twist that makes this a real lesson and not just a grumble: a huge amount of that snipping is something you control. You can't argue the tax rate down. But you can decide how often the leaf gets snipped - and that choice, repeated over decades, quietly decides how rich the plant makes you.
What a fund earns is not what you keep
Let's slow down on one idea, because everything else grows out of it. There are two different numbers hiding inside every investment, and people constantly mix them up.
The first number is what the investment earned - the gross return. Someone says "this fund made 12% last year," and that's this number. It looks like the whole story. It is not.
The second number is what you got to keep after everyone with a hand out has taken their share. Two hands reach in. The first hand is fees - the fund's charge for managing the money, plus any buying-and-selling costs. The second hand, the one we usually forget, is tax - the slice the government takes whenever you turn a gain into cash. Only after both hands have taken their share do you see your real pile.
Now here is why the tax hand is sneaky in a way the fee hand isn't. A fee shows up as a neat little number you can read on a page - "this fund charges 1.8% a year." You can compare it, complain about it, avoid it. Tax is quieter. It doesn't send you a monthly bill. It waits, patient and invisible, until the moment you sell something at a profit - and then it takes its cut in one go, often when you weren't thinking about it at all. Because it's invisible day to day, most people never add it into their sums. They compare two funds by their gross returns and their fees, feel clever, and completely miss the third partner sitting silently at the table.
And the amounts are not small. Over a lifetime of investing, the total handed to the taxman can rival or even beat the total handed to fund managers in fees. Two costs, both compounding against you, both quietly shrinking the plant - and one of them we don't even bother to look at.
There's one more reason the tax hand fools people, and it's almost funny once you see it. A gain has to exist before it can be taxed - so a tax bill always arrives wrapped inside good news. You only pay capital-gains tax because you made a profit. That makes the tax feel like a happy problem, a sign of success, something you're almost proud to pay. And so you pay it cheerfully, again and again, never noticing that the cheerful little bites are adding up to one of the largest leaks in your whole financial life. This chapter is about dragging that second cost into the light and, more importantly, about the one lever that turns it from a fortune into a trickle: how often you trade.
When exactly does the taxman get to snip?
To control a cost, you first have to understand exactly when it happens. So let's be very precise about the moment the taxman is allowed to reach in, because it's the whole hinge of the chapter.
Picture your investment as that money-plant, quietly growing taller. As long as you just hold it and let it grow, the taxman cannot touch it. Your gains on paper - the plant getting taller - are called unrealised gains. "Unrealised" is a fancy word for a simple thing: the profit exists on paper, but you haven't turned it into cash, so there's nothing to tax yet. The plant can double, triple, ten-times itself over twenty years, and through all of that growth the taxman waits outside, unable to snip a single leaf.
The taxman is only allowed in at one specific moment: when you sell at a profit - when you realise the gain by turning the taller plant back into cash. That act of selling is the snip. It "books" the profit, and booking the profit is what rings the bell that calls the taxman.
Now hold two facts about India together, because their combination is the whole secret. First, an equity mutual fund is not taxed on the buying and selling it does inside itself - when the fund manager swaps one company for another, that internal trade doesn't send you a tax bill. So far, so friendly. But second, you are taxed the moment you redeem your units - sell your part of the fund - at a profit. So the tax you actually pay is triggered by trading: either the trading you do yourself (switching funds, booking profits, chasing the next hot thing), or the trading a fund's style quietly pushes you into. The rules themselves are fixed and public: sell an equity fund within a year and the gain is taxed at one rate; hold beyond a year and it's taxed at a gentler rate, with a slice of long-term gains each year charged nothing at all. You can't change those rates. But you completely control the one thing that decides how often you meet them - how often you snip.
Watch it happen: the restless investor and the still one
Let's put real rupees down and watch two people, same money, same market, very different habits. illustrative
Meet Aayra and Rohan. They each start with ₹5,00,000 and, by luck, they pick investments that grow at the exact same speed - a steady 12% a year before anyone takes a bite. Same return, same starting pile. The only difference is temperament.
Rohan is the still one. He buys a plain, low-cost index fund and then - this is the hard part - he does nothing. He doesn't check it weekly, he doesn't switch, he doesn't "book profits." He just lets the plant grow, year after year, snip-free.
Aayra is the restless one. She's clever and busy and feels like activity is the same as effort. Every year or so she reads that some other fund is doing better, sells what she has, pays her tax, and moves the leftover into the new favourite. She's not being reckless - she genuinely thinks she's tending her money well. But every switch is a snip.
Watch what the snipping does over, say, twenty years. Each time Aayra sells at a profit, roughly an eighth of her gain that year is handed to the taxman and leaves the pot for good - and, crucially, everything that slice would have grown into over the remaining years leaves with it. Rohan hands over nothing along the way; his whole pot, gain included, keeps compounding untouched. When they both finally sell at the end, Rohan pays tax once, on one big gain, at the gentle long-term rate. Aayra has already paid, in little bites, twenty times over - and each early bite has been quietly robbing her of two decades of growth on money that was never really lost to a bad investment, only to frequent selling.
The gap at the end is jarring precisely because nothing about their investments was different. Same 12%, same market, same start. Rohan simply refused to invite the taxman in until the very last day, and that patience - doing less - left him with a meaningfully fatter pile. Aayra's restlessness didn't just cost her the tax; it cost her the growth on the tax, again and again.
The taxman as a silent business partner
There's a sharper way to feel the same idea, and it's worth its own moment. Think of deferring tax - putting off the day you sell - as keeping a silent business partner working for you for free.
Here's what I mean. When you don't sell, the money that would have gone to the taxman is still sitting in your pot, still compounding, still earning returns for you. The government has, in effect, lent you that slice of tax at zero interest, and you get to invest it and pocket whatever it earns. Every year you delay selling, that borrowed slice keeps working a little harder on your behalf. It's like having an extra, invisible partner whose only job is to grow your money, and whose fee is nothing - right up until the day you finally sell.
Let's make it concrete. illustrative Suppose Haridya has a gain of ₹1,00,000 sitting in her fund, and selling it now would trigger, say, ₹12,500 of tax. If she sells today, that ₹12,500 leaves her pot forever. But if she simply holds, that ₹12,500 stays invested and keeps growing at the same rate as everything else. Over fifteen or twenty years, at a market-like return, that single ₹12,500 she didn't hand over early can itself grow into many times its size - and all of that extra growth is hers, earned on money she'll eventually pay tax on anyway, just far later and having worked for her the whole time in between.
This is the deep reason a low-turnover, buy-and-hold approach quietly beats a busy one even when the underlying returns are identical. It's not a trick. It's just that not selling keeps the largest possible pile compounding for the longest possible time, and keeps the silent partner on your side. The moment you sell, you fire that free partner and shrink the pile. Do it rarely and the partner works for decades. Do it constantly, like Aayra, and you keep firing and re-hiring, and the partner never gets to build up any real strength. The whole edge of the still investor is that they let time and deferral do the heavy lifting that frantic activity actually undoes.
Why many small snips beat you worse than one big one
It's tempting to think, "Fine, but tax is tax - I'll pay it sooner or I'll pay it later, so what's the difference? The rate is the same either way." This is the most reasonable-sounding wrong idea in the whole chapter, and it's worth taking apart slowly, because the difference is enormous and hides inside a single word: compounding.
Here's the thing the "tax is tax" argument forgets. When you pay early, you don't just lose the tax rupee - you lose it at the start, when it had the most years left to grow. A rupee taken from you today would have compounded for twenty years. The same rupee taken twenty years from now compounds for zero years. Same rupee, wildly different cost, and the difference is all the growth in between.
So paying tax many small times along the way isn't the same as paying it once at the end, even if the rate never changes. Each early payment is a rupee pulled out at its most valuable moment - youth, with decades of compounding ahead of it. Pull rupees out young, again and again, and you're forever draining the pot of its best-growing money. Wait and pay once at the end, and every rupee got to grow to its full height first, and only then does the taxman take his slice off the top.
Think of it like a fruit tree. If you keep picking and selling the young fruit early every season, you get a little cash now but you also keep removing what would have become next year's bigger branches. If instead you let the tree grow to full size and only harvest once, at the end, the tree got to use every bit of itself to grow taller the whole time. The taxman still gets his share of the final harvest - but the harvest is vastly bigger, because nothing was picked off early. Frequent small taxes quietly amputate your compounding; one patient tax at the end lets it run to full length first. That, in one image, is why the still investor pulls ahead of the busy one even when their investments are identical.
Stacking the bites: fee, then tax, then inflation
Now let's zoom all the way out, because tax is not the only hand reaching into the pot - it's one of three, and they bite in sequence. Seeing the full stack is what turns a vague "taxes matter" into a clear picture of what you really keep. illustrative
Start with the poster number - the gross return. Say a fund earns 12% in a good year. That's the number people quote and cheer. But you never get to keep 12%. Watch the bites, one after another.
First bite: fees. An expensive active fund might charge around 1.8% a year. That comes straight off the top, every year, whether the fund did well or badly. Gross 12% becomes about 10.2% after the fund's hand.
Second bite: tax. If your habits (or the fund's) mean you're realising gains and paying along the way, another slice goes. Say that quietly costs you another 1% a year in tax you needn't have triggered. Now you're near 9.2%.
Third bite: inflation - the sneakiest of all, because it doesn't take rupees, it shrinks what each rupee buys. If prices are rising around 6% a year, then of your 9.2% nominal gain, roughly 6% is just running to stay still. What's left - the part that actually makes you richer in groceries-and-school-fees terms - is only about 3%. Your shiny 12% has quietly become a real 3%.
Look hard at that last line in the figure, because it holds the practical hope. Two of those bites are controllable. You can't lower the tax rate and you can't switch off inflation. But you can pick a cheap fund instead of a dear one, shrinking the fee bite - and you can trade rarely instead of constantly, shrinking the tax bite. Those two choices don't sound heroic. Yet on that stubbornly small real-return number, shaving even one percent off fees and one off self-inflicted tax can be the difference between a real 3% and a real 5% - and over decades, a real 5% builds a corpus roughly twice the size of a real 3%. The poster number is out of your hands. The two bites you can shrink are exactly where the whole game is won.
Watch it happen: the March tax panic
Let's watch the opposite mistake do its quiet damage - the one where fear of tax, not love of trading, is the villain. illustrative
Meet Arjun. It's late March, the tax year is closing, and he suddenly realises he hasn't done anything to reduce this year's tax. A colleague mentions a plan that gives a deduction. Arjun doesn't really study it; he just wants the tax saved before the deadline, so he puts ₹1,50,000 into it. On paper it feels like a win - the deduction saves him around ₹45,000 in tax this year, and saving ₹45,000 feels great.
But look at what he actually bought in his rush. The product locks his money away for many years and, underneath, grows at a sleepy rate - say around 5% a year - far below what a plain, low-cost index fund might have done over the same long stretch. Run it forward. Over fifteen years, ₹1,50,000 crawling at 5% becomes roughly ₹3,10,000. The same ₹1,50,000 in a simple index fund growing at a market-like rate could have become two or three times that. The gap - several lakhs of growth he gave up - dwarfs the ₹45,000 he was so pleased to save.
That's the whole trap in one number. Arjun let a certain, small, one-time tax saving push him into an uncertain-to-avoid, large, lifelong opportunity cost. He didn't judge the investment on its merits at all; he judged it purely by the tax it saved this March, and the tax tail dragged the whole decision along behind it. Had he first asked "is this a good place for my money for fifteen years?" the answer would have been a flat no, deduction or not - and a genuinely good tax-friendly option (a decent low-cost instrument that also carries a break) was sitting right there for the same deadline. Saving tax was never the mistake. Letting the tax saving choose the investment was.
Where people trip up
The mistakes here almost never look like mistakes. They look like being sensible. That's what makes them dangerous.
The first slip is "booking profits" for its own sake. It feels wise and grown-up to sell after a good run and "lock in" the gain. But every time you do it inside a long-term plan, you've voluntarily invited the taxman in early and shrunk the pile that keeps compounding. Locking in a gain you didn't need to touch is often just paying tax sooner for no reward.
The second slip is fund-chasing - Aayra's habit. Every switch to last year's winner is a taxable sale dressed up as prudence. The new fund has to beat the old one by more than the tax and costs you just paid, merely to break even. Most of the time it doesn't.
But the deepest slip is the opposite one, and it deserves the strongest warning: letting the fear of tax drive the whole decision.
Notice the shape of the whole section. On one side, people trade too much and pay too much tax by snipping constantly. On the other, people get so scared of tax that they either buy junk to dodge it or refuse to fix a bad holding because of it. The calm middle is: trade rarely, but when the investment itself genuinely calls for a sale, sell - and don't let a tax bill turn a good decision into a bad one.
Where this idea can mislead you
Now the honest edges, because "taxes are costs, so trade less" is a powerful rule that can be pushed until it breaks.
First, low turnover is not the same as never selling, ever. The point isn't to freeze forever; it's to avoid pointless selling. There are perfectly good reasons to sell that have nothing to do with chasing performance - you need the money for the goal it was saving for, the investment genuinely turned bad, or your life changed and this holding no longer fits. Deferring tax is a wonderful side-benefit of patient holding, not a life sentence chaining you to something you should sell. Survival of your plan comes first; the tax saving serves the plan, not the other way round - which is exactly the tax-tail warning pointed back at you.
Second, an index fund is not magically tax-free. Its edge is deferral and low turnover, not exemption. You will still pay tax the day you finally sell - the gain didn't vanish, it just waited. The win is real but modest and slow: one gentle tax event at the end instead of many along the way, and decades of the whole pot compounding untouched in between. Don't oversell it in your head into "no tax." It's "less tax, paid later, once."
Third, and gently: the exact tax rates, holding periods, and exemptions are set by the government and they change. The numbers I've used are illustrative, chosen to show the shape of the idea, not to be quoted as this year's law. What doesn't change is the underlying logic - tax is a cost, it bites when you sell, and trading less defers it. When the specific rules shift, check them, but the principle underneath will still be standing.
And a final caution against smugness: after-tax thinking is a tool for keeping more of a good return, not a substitute for earning one. A dreadful investment held for years is still a dreadful investment, however tax-efficiently you held it. Get the investment right first - sensible, low-cost, suited to your goal - and then let tax-aware patience quietly add its bonus on top. Tax efficiency is the polish, never the paint.
Carry forward
- Tax is a cost, just like a fee - and a big one. It's sneakier because it's invisible day to day, waiting silently until you sell to take its slice. Add it into your sums, or you're comparing investments with one of the two biggest costs left out.
- The taxman can only snip when you realise a gain by selling. So the more you trade - chasing funds, booking profits, staying busy - the more often you hand him a cut early, and every early rupee taken is a rupee that stops compounding for you. Trade rarely and you keep a free silent partner working for decades.
- Don't flip into fear, though. Letting the tax bill run the show - buying junk for a deduction, or clinging to a bad holding to dodge a tax - is its own trap.
taxes are just another cost, one you largely control - the taxman only takes a slice when you sell, so the restless investor who keeps snipping hands him bite after early bite and shrinks the pile that compounds, while the still investor who holds a cheap index fund defers that tax for decades and keeps a free partner working; so trade rarely, count what you keep after tax and inflation rather than the poster return, and never let the fear of a tax bill talk you into a bad investment or out of fixing one.