Is your target backed by math or just a number that sounds right? Discover a step-by-step approach to build the corpus your financial goals truly require.
“I’ll need about Rs 5 crore for retirement.” I hear this a lot, and honestly, I used to say it too. But that’s not a calculation, it’s a feeling. And a feeling isn’t something you can retire on.
Here’s the thing: your corpus number shouldn’t come from what sounds big. It should come from your actual goal, your actual expenses, and a bit of math. Let me walk you through the framework.
The Problem With Round Numbers
Most of us pick a corpus target the same way – ₹2 crore, ₹5 crore, whatever sounds comfortable. We ignore inflation, assume the market will always be kind, and never once ask “What if the next decade isn’t great?”
That’s not planning. That’s hoping.
A 6-Step Method To Actually Get There:
1. Define The Goal And Horizon. Retirement, a child’s education, a house. Each is different. Retirement might mean 20-40 years to get there, then 20-30 years of withdrawing from it. A house down payment might be just 3-7 years out. Know which one you’re solving for, and be specific about today’s expense and not a round estimate.
2. Adjust For Inflation. This is the silent killer. A monthly expense of ₹60,000 today becomes ₹2.58 lakh in 25 years, just to maintain the same lifestyle at a fairly standard 6% inflation assumption. Healthcare and education usually run even hotter than this.
3. Use Realistic Return Assumptions. Nominal returns don’t matter, real returns do. Equity might average 12% nominal, but after 6% inflation, that’s really 6%. Debt at 7% nominal is barely 1% real. A plan built on best-case equity returns for 25 years isn’t ambitious. It’s fragile.
4. Back-Calculate The Corpus. Once you know your future expense, divide it by a safe withdrawal rate (typically 5% or lower) to get your corpus number. Simple formula: Corpus = Future annual expense ÷ Safe withdrawal rate.
5. Reverse-Engineer The SIP. Say the math says you need ₹6.11 crore in 25 years. A flat SIP (never increasing) would need ₹38,439/month. But a step-up SIP that rises 8% a year with your income gets you there starting at just ₹19,934/month. The catch: it only works if you actually increase your contribution every year.
6. Build A Glide Path, And Stress-Test It. As the goal nears, shift slowly and gradually from growth assets to safety. And always check what happens if returns run lower than expected. In this example, if your assumed 11% return drops to 9%, your required SIP jumps 41%, from ₹38,439 to ₹54,129. If your plan only survives at the best-case return, it isn’t a plan.
A Simple Worked Example
Someone at 35, planning to retire at 60, spending ₹60,000/month today, wants 25 years of retirement funded. Run it through the framework:
- Future monthly expense at retirement: ₹2.58 lakh
- Corpus needed: ₹6.11 crore
- Implied withdrawal rate: 5.05%
Mistakes To Avoid
- Picking a round number because it “feels” big
- Using today’s expense as if it’s still the target 20-30 years out
- Assuming best-case equity returns for the whole horizon
- Sticking to one withdrawal number forever, instead of adjusting as the corpus depletes
- Staying equity-heavy right up to the goal date
- Never stress-testing at a lower return
Your Checklist
- Write down the goal, today’s expense, and the time horizon
- Inflate today’s expense to its future value at 6%
- Pick a realistic return and withdrawal rate
- Back-calculate: Future expense ÷ Withdrawal rate
- Reverse-engineer a step-up SIP to reach that number
- Build a glide path that de-risks in the final 5-10 years
- Re-run the numbers 2 points below your base-case return
This framework works for any goal. Retirement, a house, your kid’s education. Start with the goal, not the number.
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