Understanding Inflation

Inflation is the rate at which prices rise and purchasing power falls. At a modest 6% average inflation, something that costs $1 today costs roughly $2 in 10 years and $3 in 20 years. This is why 'safe' money sitting in a savings account earning 3-4% is actually losing real value every single year — you're growing in nominal terms while shrinking in what that money can actually buy.

This is the entire argument for taking on some investment risk for long-term goals. Fixed deposits at 6-7% barely keep pace with inflation before tax; after tax, they often lose to it. Equity has historically outpaced inflation by a meaningful margin over long periods precisely because it carries real short-term risk that FDs don't — the extra return is compensation for that risk, not a free lunch.

Inflation isn't uniform either. Healthcare and education costs in India have historically risen faster than general inflation, often 8-10% a year. If your goals involve either — a child's college fund, a retirement corpus that must cover medical costs — using the general inflation rate to plan will systematically undershoot what you actually need.

The practical habit: whenever you set a savings target for something more than 5 years away, inflate the target first, then work out the required monthly investment. Planning with today's prices for a goal a decade away is one of the most common and costly mistakes in personal financial planning.

A quick way to feel inflation's pace is the rule of 72: divide 72 by the inflation rate to estimate how many years prices take to double. At 6% inflation, prices double in about 12 years; at 8% (closer to what healthcare and education have historically run at in India), they double in about 9. A retirement 30 years away, at 6% inflation, sees prices roughly six times over — which is why planning with today's costs badly understates what's actually needed.

Tax makes the gap worse than it looks. A fixed deposit paying 7% sounds close to keeping up with 6% inflation, but after 30% tax on the interest, the real return drops to about 4.9% nominal — a real loss of roughly 1.1% a year once inflation is accounted for. Money sitting in an FD for a long-term goal isn't just growing slowly; in after-tax, after-inflation terms, it's often shrinking.

To inflate a target correctly: take today's cost, then compound it forward at your assumed inflation rate for the years until you need it, not the number of years you'll be investing. A $20.8K goal 15 years away, at 7% inflation, needs roughly $57.2K by the time it arrives — treating it as a $20.8K goal and investing accordingly would fall well short.