What inflation quietly does to your money

The doubling clock

The rule of 72 turns inflation into a clock: divide 72 by the rate to get the years prices take to double. At 6%, that is every 12 years. A 25-year-old will see roughly four doublings by 75 — the ₹50,000 monthly household budget of today asking for ₹2 lakh at retirement and ₹4 lakh a dozen years after that, with no lifestyle upgrade whatsoever, just the same groceries wearing new price tags.

The trap is that human intuition is linear and inflation is exponential. Over one year, 6% feels like rounding error — nobody cancels plans over it. Over thirty years it is a 5.7× multiplication, and it arrives with exactly the same silence. That asymmetry — negligible per year, decisive per decade — is why inflation wrecks specifically the plans with the longest horizons: retirement, a child’s education, financial independence.

Real returns: the only honest scoreboard

Subtract inflation from any return before you admire it. A savings account paying 3% in a 6% world is losing 3% of purchasing power a year — safety in nominal terms, guaranteed erosion in real ones. A 7% FD clears the bar by about 1%, and then tax takes its turn: at the 30% slab, that 7% becomes 4.9% post-tax, which is below 6% — a deposit that is literally shrinking your wealth while reporting growth. PPF at 7.1% tax-free holds the line at roughly +1% real, which is respectable for a sovereign-guaranteed product but is preservation, not growth.

This is the actual argument for equity in long-horizon money — not excitement, arithmetic. Diversified equity’s historical 11–13% in India translates to 5–7% real, and 5–7% compounded over decades is the difference between a corpus that keeps pace and one that multiplies. The FD vs RD vs PPF vs SIP comparison shows the same monthly saving routed four ways; the spread between the lines is mostly inflation being beaten or not. The honest frame is a spectrum: deposits defend money you will need soon, equity grows money you will not touch for a decade — and matching the asset to the horizon matters more than picking the perfect fund.

Your inflation is not the CPI

The headline CPI is an average over a national basket, and your life is not average. Education inflation in India has run 8–10% a year — a professional degree costing ₹20 lakh today lands near ₹73 lakh in fifteen years at 9%. Healthcare compounds near 10%, which is why the insurance cover that felt generous at 40 feels thin at 60. Meanwhile electronics deflate and telecom is flat — but nobody funds a retirement out of cheaper televisions.

So use different rates for different goals: 6% for general living costs, 8–10% for a child’s education corpus, 10% for future medical costs. The gap sounds academic and is enormous: a 20-year goal assumed at 6% instead of a true 9% leaves you saving toward barely half the real target. Slide the rate in the inflation calculator and watch a goal move — it is the cheapest stress test in personal finance.

Four defences that actually work

First, inflate the goal before you plan the saving. “₹1 crore for retirement” is not a plan until you say when — ₹1 crore in 25 years is ₹23 lakh of today’s purchasing power, pleasant but nowhere near a retirement. Convert the goal to future rupees first, then size the SIP against that number.

Second, make your contributions inflate too. A fixed SIP quietly shrinks in real terms every year — ₹10,000 a month is a smaller sacrifice, and a smaller investment, at every birthday. A step-up SIP rising 10% a year keeps the real value of your investing constant and typically adds 40–60% to a 15-year corpus versus a flat SIP.

Third, apply the same lens to income. An increment below CPI is a real pay cut, whatever the congratulatory email says; a 5% raise in a 6% year means your employer quietly reduced your salary. Negotiate against inflation, not against zero — and remember the salary-slip arithmetic when a restructure is offered instead of a raise. Fourth, keep only deliberate money in cash: the emergency fund earns its negative real return by being instantly available — that is insurance premium, not laziness. Cash beyond the emergency fund is paying that premium for nothing.