Most people invest a round number — ₹5,000, ₹10,000 — and hope it works out. Goal-based investing does the opposite. You decide the goal, work out what it will cost when you need it, and then calculate the monthly investment required to get there.
Step 1: inflate the goal
A house costing ₹50,00,000 today will not cost that in ten years. At 7% inflation it will cost roughly ₹98,00,000. Education and healthcare rise faster still, often 8–10% a year, so a college fund needs a higher inflation assumption than a general savings goal.
Planning for ₹50 lakh when you actually need ₹98 lakh means the monthly SIP you calculate will be roughly half of what is required. The inflation calculator gives you the future cost quickly.
Step 2: calculate the monthly investment
With the inflated target, the time available, and a realistic return, the required SIP follows directly. Aiming for ₹1 crore in fifteen years at 12% needs about ₹19,819 a month — and the calculator shows that roughly ₹35.7 lakh of the crore is your own money while about ₹64.3 lakh comes from compounding.
Our target SIP calculator does this in one step and also tells you the total invested versus the returns, which is often the more motivating number.
If the required SIP is unaffordable
Sometimes the honest answer is that the goal, as stated, needs more per month than you can comfortably invest. There are only three levers, and it helps to be deliberate about which one you pull.
- Extend the timeline. Usually the least painful, because time does work that a larger instalment would have done.
- Revisit the goal. A slightly smaller house, a different locality or a public university instead of private can close most of the gap.
- Adjust the return assumption cautiously. Only after the first two, and only with the risk that comes with a higher expected return.
What you should not do is assume 15% returns to make the numbers look comfortable, then invest too little as a result.
Use a flat SIP or a step-up?
If your income will grow, a step-up SIP is usually the better structure. Increasing the instalment by around 10% a year for fifteen years is projected to build roughly ₹86.8 lakh, against about ₹50 lakh for a flat SIP of the same starting amount. That is the difference between reaching the goal and falling a long way short.
The step-up SIP calculator models this, and the SIP calculator gives the flat comparison.
A simple annual routine
- Once a year, re-inflate the goal and check whether the target has moved.
- Check the current value of the investment against the plan.
- Increase the SIP with your increment rather than leaving it fixed.
- If the gap has widened, fix it early — a shortfall discovered in year three is a small problem, and in year thirteen it is a serious one.
Goal-based investing is not about predicting markets. It is about knowing the number, and then doing the boring monthly thing that reaches it.
Read next
Sukanya Samriddhi or PPF: Which Suits a Child's Future?
Both are government-backed, tax-free and long-term. The right choice comes down to the deposit window, the maturity date and what the money is for.
· 3 min read
Retirement Corpus: How Much Is Actually Enough?
The number usually shocks people. Here is the two-step calculation behind it, and the levers that make it smaller.
· 3 min read
SWP: Turning a Corpus Into a Monthly Income
A systematic withdrawal plan pays you every month while the balance stays invested. Whether it lasts depends almost entirely on the withdrawal rate.
· 3 min read
Put the numbers to work
Every guide here pairs with a free calculator — no sign-up, no clutter.
Browse all calculators