Purchasing Power and Inflation: Why Your Future Money Is Worth Less Than You Think

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Say you save ₹10 lakhs and leave it in the bank. Twenty years from now, the statement still reads ₹10 lakhs. Same number, same comforting row of zeroes. The problem is what that number can actually buy by then, which is a lot less than it buys today.

Most of us were taught to think about money as the figure on the screen. But that figure is a poor guide to whether you're getting richer or poorer, because the figure stays still while the world around it gets more expensive. There's a name for the force doing that: inflation. And there's a way to measure what your money can really do at any given moment: purchasing power.

If you've ever set a goal like "I want ₹1 crore for retirement" and felt vaguely satisfied, this is the post that should make you slightly uncomfortable. You can hit that number exactly and still come up short, because the ₹1 crore you imagined and the ₹1 crore that actually lands in your account decades later are not the same thing.

Here's the plan: I'll explain both ideas from scratch, show the math with real numbers, and then walk you through the Goal Savings Planner so you can set targets that survive contact with reality.

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What is Inflation?

Inflation is just the general drift upward in prices over time. If inflation runs at 6% this year, the basket of things you buy will cost about 6% more a year from now. Not one item. Everything, on average.

The standard yardstick is the Consumer Price Index (CPI). Statisticians fix a "basket" of what a typical household actually buys — rice, fuel, rent, a doctor's visit, a bus ticket — and track what that basket costs month to month. The change in that cost is the inflation rate. Simple idea, surprisingly slippery in practice.

Here's how India and the US have actually moved:

📌 noteEducation and healthcare in India inflate at 8-12% a year, well above headline CPI. If your goal involves school fees or hospital bills, plan with a higher rate than the official number.tap to close📌Education and healthcare in India inflate at 8-12% a year, well above headline CPI. If your goal involves school fees or hospital bills, plan with a higher rate than the official number.

India has sat in the 5-7% range for most of the last decade, with the occasional jump past 6% when food or fuel spikes. The US was boringly low until 2021-22, when stalled supply chains met a wall of stimulus cash and inflation hit a 40-year high.

One thing worth sitting with: the headline number usually understates what a middle-class urban household actually feels. School fees climb 8-12% a year. A night in a private hospital rises 10-15%. If your life includes private schooling, a city flat, and regular medical bills, your personal inflation rate is almost certainly running ahead of the official 5-6%. That gap is the whole reason the planning numbers later in this post sometimes look alarming.

Why prices keep rising

Two forces, mostly. The first is demand-pull: too much money chasing too few goods, so prices climb. That's roughly what happened worldwide after pandemic stimulus flooded in while factories were still shut.

The second is cost-push: when the cost of making something rises — fuel, raw materials, wages — producers pass it on. India's food-price spikes, often triggered by a bad monsoon, are the classic example.

Either way, the result is the same. Your money buys less. Which brings us to the thing actually being eroded.

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What is Purchasing Power?

Purchasing power is how much your money can buy. That's it. It's inflation seen from the other side: when prices rise, the same note in your wallet does less work.

A concrete version helps. A decent plate of biryani in Mumbai ran about ₹80-90 back in 2006. Today it's ₹250-300, and your 2006 ₹90 wouldn't even cover the container it comes in. The note didn't change. The biryani didn't change. What ₹90 could command at the counter quietly fell by more than 60%.

This is where most planning goes wrong, and it comes down to one distinction:

What ₹1 lakh quietly turns into

At 6%, money loses roughly half its purchasing power every twelve years. Stretch that to thirty years and your ₹1 lakh buys what ₹17,000 buys today. The number on the statement never went down. Its usefulness did.

This is also why "keeping money safe" in a savings account is one of the least safe things you can do with a long horizon. A 3.5% savings account against 6% inflation hands you a real return of about minus 2.5% a year. The balance creeps up, you feel responsible, and you're going backwards the whole time.

If you want to feel this for yourself rather than take my word for it, the Inflation Calculator lets you punch in any amount and watch it erode at whatever rate and horizon you choose.

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The Math of Compound Inflation

Inflation compounds exactly the way investment returns do — quietly, then all at once. (You can watch both forces pull against each other in the Compound Interest Calculator.) Two formulas cover everything you'll need:

They're the same idea pointed in opposite directions. Run a real example each way.

Direction 1: what will ₹50 lakhs actually be worth?

Suppose you retire in 20 years with a ₹50 lakh corpus. At 6% inflation:

Real Value = ₹50,00,000 / (1.06)^20 = ₹50,00,000 / 3.207 = ₹15.6 lakhs in today's money

That corpus will support the lifestyle ₹15.6 lakhs buys today — no more. If you spend ₹50,000 a month now, ₹50 lakhs covers roughly two and a half years, not the rest of your life.

Direction 2: so how big does it actually need to be?

Flip it. You want the real equivalent of ₹50 lakhs today, 20 years out. How large does the corpus have to be?

Future Amount Needed = ₹50,00,000 × (1.06)^20 = ₹50,00,000 × 3.207 = ₹1.6 crores

You need ₹1.6 crores to stand where ₹50 lakhs stands today. That's the number to aim at — not ₹50 lakhs.

The same goals, in future rupees

📌 noteNotice how violently the 8% column pulls away from the rest. Small differences in the inflation rate compound into enormous gaps over 25-30 years.tap to close📌Notice how violently the 8% column pulls away from the rest. Small differences in the inflation rate compound into enormous gaps over 25-30 years.

Each figure is what your account needs to read at the end of the period to preserve the purchasing power of that goal today. Healthcare and education, which often inflate at 8-10%, live in that scary right-hand column — which is exactly why they need a bigger corpus than a "general" goal of the same size.

If you want to see compounding working for you on the investment side rather than against you on the price side, Valuation 101: When to Buy is a good companion read.

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Three Examples That Make It Real

Math is convincing; stories are sticky. Here are three that show what inflation does to an actual plan.

A child's college fund

Retirement, in monthly terms

Your household spends ₹60,000 a month right now, and you retire in 25 years. What monthly income do you need on day one of retirement to live the same way?

₹60,000 × (1.06)^25 = ₹60,000 × 4.292 = ₹2.58 lakhs a month

To throw off ₹2.58 lakhs a month at a conservative ~7% annual withdrawal, you're looking at a corpus near ₹4.4 crores. Not the ₹1-2 crore figure that gets tossed around at dinner tables. This is the kind of gap that only shows up when you do the inflation step instead of skipping it.

The US version

A 35-year-old American is aiming at a $500,000 retirement pot in 20 years. At 3% US inflation:

$500,000 / (1.03)^20 = $500,000 / 1.806 = $276,900 in today's dollars

So that $500K will feel like about $277K when it arrives. To genuinely preserve $500K of today's spending power, the target is closer to $902,000 nominal. Lower inflation, same trap, smaller numbers.

Sizing a goal correctly is the whole foundation of building a diversified portfolio — get the target wrong and the portfolio is the right tool aimed at the wrong number. It's also worth knowing where you stand today in real terms: the Personal Balance Sheet records your assets and liabilities, and its Projection tab compounds each asset class at a growth rate you set, then strips out inflation to show your real net-worth path over 10, 20, or 30 years.

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Using the Goal Planner to Build Inflation In

The Goal Savings Planner has an Inflation Rate slider that does all of this for you. You don't have to memorize the formulas — you just have to feed it honest inputs. Here's how I'd run it.

1. Pick your mode

There's a toggle at the top of the input panel.

Fix Goal is for when you know the destination: "I need ₹50 lakhs in today's money for college in 15 years." The tool tells you the SIP required.

Fix SIP is for when you know the monthly cheque: "I can put away ₹15,000 a month — where does that land in 20 years?"

2. Enter the goal in today's rupees

This is the part people get wrong, so it's worth being blunt: enter the goal in today's purchasing power, not some inflated future guess. If retirement feels like "₹1 crore of today's money," type ₹1 crore. The slider handles the conversion to future rupees.

3. Set the inflation rate

The default is 6%, which is fine for general household spending. Match it to what the goal actually funds:

If a single goal spans categories — a retirement that's part healthcare, part everything-else — split the difference and use something like 7-8%.

4. Read the donut chart

The chart has two rings, and once you see what each one means it's hard to unsee.

The inner ring (blue and green) is how the corpus got built: blue is what you put in over all those years of SIPs, green is what the market added on top. Together they're your nominal corpus.

The outer ring (amber and red) is what inflation does to it. Amber is the "Real Value Today" — what the corpus is worth in today's money. The red slice is what inflation eats.

The center shows two numbers stacked: nominal corpus on top, real value below. The habit to build is ignoring the big top number and judging the plan by the smaller one underneath. Real value above your goal means on track; below means adjust.

5. Read it, then change something

If real value lands below target, you've got three levers: invest more each month, give it more time, or trim the goal (some goals can be phased or partly funded rather than abandoned). If real value lands comfortably above, you've built a buffer — keep it, or redirect a little to another goal.

6. Glance at the summary bar

The bar across the bottom lines up the three numbers that matter — total invested, total corpus, real value — so you can see at a glance what you put in, what you get on paper, and what it's truly worth.

And the Fix SIP version, concretely: say you can manage ₹15,000 a month and want to see where that goes over 20 years at 12% returns and 6% inflation. Set the SIP to ₹15,000, timeline to 20, return to 12%, inflation to 6%. The tool shows the nominal corpus, and the Real Value card translates it into today's money. If that real number clears your goal, your current SIP is enough. If it doesn't, you now know exactly how much further you have to stretch — which beats finding out in year 19. For a quick nominal-only number with no inflation layer, the SIP Calculator does that in one screen, and the CAGR Calculator helps you sanity-check whatever return rate you assumed.

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Why Equity Beats Inflation Over the Long Run

Once the erosion math clicks, it becomes obvious why parking long-term money in a savings account or FD is the genuinely risky choice — not the cautious one it pretends to be.

The Nifty 50 — India's index of its 50 largest listed companies — has done roughly 12-13% CAGR over rolling 20-year stretches. Net of 6% inflation, that's 6-7% real, which is enough to double your real wealth every decade or so. (Understanding the Nifty 50 goes deeper on the index and its return history.) If you want the broader picture of how debt and equity returns relate, Bonds vs Stocks covers it.

The arithmetic underneath it all is one line:

Real return = Nominal return − Inflation rate

Nifty 50 Index Fund12-13% nominal+6 to 7%

Small Cap Index13-16% nominal+7 to 10%

Debt Mutual Fund6-8% nominal0 to 2%

FD (post-tax)4.5-5.25% nominal-1 to -1.5%

Savings Account3-4% nominal-2 to -3%

Bar length shows magnitude. Red and amber bars are negative or near-zero real returns — money losing ground even as the balance ticks up.

There's a deeper reason equity tends to outrun inflation, beyond the headline returns. A company with real pricing power can raise prices faster than its costs rise. When it sells something essential and faces little competition, it passes inflation straight to customers instead of swallowing it. That ability has a name — an economic moat — and businesses that have one tend to grow earnings faster than prices over time. Own a basket of them through an index fund and inflation stops being purely a threat and becomes, in part, something working in your favour.

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Where Inflation Planning Usually Goes Wrong

Even people who understand inflation in theory trip over the same four things in practice.

Setting the goal in future nominal terms

Using one inflation rate for everything

Not all prices move together. A laptop that cost ₹80,000 in 2015 is far more capable today for the same money — that's deflation. Meanwhile a private hospital bed that ran ₹5,000 a day in 2015 is now ₹12,000-15,000. Blend those into one number and you'll badly misjudge both. Use rates that fit the spending: education 8-10%, healthcare 10-12%, housing 6-8%, general lifestyle 5-6%, tech roughly flat or falling.

Waving off inflation on short goals

"It's only three years, inflation barely matters." Three years at 6% still costs you about 16% of purchasing power. On a ₹10 lakh goal that's ₹1.6 lakhs — real money for a down payment or a car. It matters less than on a 20-year goal, sure. It's never zero.

Stopping SIPs when markets fall

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The Short Version

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The Goal Savings Planner folds all of this into one screen. Enter the goal in today's money, set the inflation slider to fit, and watch the outer ring split into the part you keep and the part inflation takes. The gap between that amber and that red is the exact problem you're solving when you choose equity over a savings account for the long haul.

See the gap clearly, and you're already most of the way to planning around it.