Setting a goal amount that will still be right in ten years

How to inflate a goal set in today’s money to what it will actually cost, and how much the instalment changes when you do it properly.

The short answer: A goal set in today's money is already wrong for any date more than a couple of years away, and the error compounds. A ₹30 lakh education cost fifteen years out is not a ₹30 lakh problem — at 8% education inflation it is closer to ₹95 lakh, and a plan funded to the smaller figure lands about two-thirds short. The fix is one multiplication done before anything else: inflate the target to what it will cost at the date, then solve for the instalment against that number. The second half of the fix is choosing the right inflation rate, because education and healthcare have historically outpaced the general index by enough to matter over long horizons.

Key points

Inflate the target before solving for the instalment; solving first and adjusting later understates the requirement.
Use a category-appropriate rate — education and healthcare have historically risen faster than the general index.
The error grows with the horizon, so the goals most likely to be under-funded are the most important ones.
Revisit annually: both the target and the assumption move, and a fifteen-year plan set once is a plan set wrong.

The one multiplication

Future cost of a goal: Future cost = Today’s cost × (1 + i)^n

Today’s cost — what the thing would cost if you bought it now.
i — the annual inflation rate for that category, as a decimal.
n — years until you need it.

A university education, fifteen years out

Cost today: ₹30,00,000
Education inflation assumed: 8% a year
Years: 15
Multiplier: 1.08^15 ≈ 3.172
Cost at the date: ≈ ₹95,16,000
Funding to ₹30 lakh instead: Covers roughly 32% of the actual cost

A plan built on today's price funds under a third of the requirement. Nothing about the plan was careless except the missing multiplication, which is what makes this the most consequential single step in goal planning.

Run the same numbers at 6% and the target is roughly ₹72 lakh. The gap between the two assumptions is ₹23 lakh, which is why the honest output is a range and why the assumption deserves to be stated wherever the figure is quoted.

Choosing the rate

Which assumption fits which goal
Goal	Rate to consider	Why
General living costs in retirement	General consumer inflation	A broad basket resembles a broad basket
Education	Higher than general	Fee inflation has historically outpaced the general index
Healthcare provision	Higher than general	Medical cost inflation has run above the headline rate
A property deposit	Property-specific, and location-dependent	Property does not track the consumer index at all
A car or durable good	General or lower	Manufactured goods have often inflated slowly

Directional guidance rather than rates. For current and historical figures, the RBI publishes the price statistics.

From an inflated target to a monthly figure

Once the target is inflated, solving for the contribution is the standard annuity calculation — the same formula as SIP maths, rearranged for the payment. The important thing is the order: inflate first, then solve. Solving against today's cost and adding a margin afterwards systematically under-provides, because the margin people add is nothing like a threefold multiplier.

Two adjustments reduce the instalment materially. A step-up contribution, which matches how income actually behaves and lowers the starting figure substantially. And subtracting anything already saved toward the goal before solving, which is easy to forget when the target has just tripled.

Reverse Goal Planner: The Reverse Goal Planner does exactly this sequence — it inflates the target to the horizon before solving for the instalment, and offers a 10% step-up option.

The same discipline applies to the largest goal of all, where the horizon is longest and the multiplier therefore biggest — see working out the retirement corpus you need.

One more adjustment is worth making explicit, because leaving it out is the second most common error after skipping the inflation step entirely. When you inflate the target, you must use a NOMINAL return to grow the contributions toward it — or, equivalently, keep the target in today's money and use a real return. Mixing the two, by inflating the target and then also using a real return, double-counts inflation and produces a required instalment far larger than the goal actually needs.

Either convention works and neither is more correct. What matters is being explicit about which one a given calculation is using, because the two produce very different-looking numbers from the same underlying plan — and a figure quoted without saying which convention produced it cannot be checked by anyone, including you a year later.

Frequently asked questions

What inflation rate should I use for a goal?

Match it to the category rather than using one rate for everything. General living costs take a general assumption; education and healthcare have historically risen faster and warrant a higher one; a specific durable good may warrant a lower one. Then run the calculation at two rates a couple of points apart, because the spread is more informative than either single answer.

Does inflation matter for a two-year goal?

Marginally. Over two years at 6%, a target rises about 12% — real, but small relative to the uncertainty in your own plans over that period. It becomes the dominant term somewhere around the five-to-seven-year mark and is the largest single factor in any goal beyond ten years.

Should the monthly contribution also rise?

Ideally yes, and it is the single most effective adjustment available. A fixed instalment loses purchasing power every year, so a flat contribution funds a shrinking real share of an inflating target. A step-up of even a modest percentage annually — matched to your own income growth — substantially lowers the starting instalment required.

Sources

Reserve Bank of India — price statistics