Calculate Retirement Targets Use Case

⏱ 4 min read · Finance Utils

The Problem: Most People Have No Retirement Number

Most working Indians are saving for retirement without knowing how much they actually need. They contribute to EPF because it's mandatory, maybe have a PPF account, possibly run a SIP — but they don't have a specific target corpus figure. Without a target, there's no way to know if current savings are adequate or insufficient. The retirement target calculation use case solves this: it converts vague "saving for retirement" into a specific, calculable corpus target that makes current savings either clearly sufficient or clearly insufficient — enabling informed action rather than optimistic assumption.

Step 1: Estimate Monthly Expenses at Retirement

Start with today's monthly expenses — what do you actually spend on housing, food, utilities, transport, healthcare, leisure, and family obligations? This is your baseline. Adjust for retirement: remove work-related costs (commuting, professional clothing, work lunches) but add healthcare costs (typically increase significantly with age). A common approximation is 70–80% of current working expenses for the first 10 years of retirement, rising toward 90–100% as healthcare costs grow in later years. If your current monthly spend is ₹70,000, estimate retirement monthly need at ₹50,000–56,000 in today's rupees.

Step 2: Inflation-Adjust to Retirement Date

The retirement monthly expense estimate is in today's rupees — but you'll be retiring in future rupees. Apply inflation to convert: Future monthly expense = Today's expense × (1 + inflation rate)^years to retirement. At 6% inflation for 25 years: ₹55,000 × (1.06)^25 = ₹55,000 × 4.29 = ₹2.36 lakh/month. This is what your retirement will cost per month when you actually retire — not ₹55,000. This inflation-adjusted figure is the number that drives your corpus target, and it's typically 3–5× the today's-rupees figure for 20–30 year horizons.

Step 3: Calculate Required Corpus Using Safe Withdrawal Rate

The required corpus is determined by the safe withdrawal rate — the annual withdrawal as a percentage of corpus that sustains the portfolio for 25–30 years of retirement. The widely used benchmark is 4–5% annually (or equivalently, 20–25× annual expenses). At ₹2.36 lakh/month retirement expense (₹28.3 lakh/year): at 4% withdrawal rate, required corpus = ₹28.3 lakh / 0.04 = ₹7.1 crore. At 5% withdrawal rate: ₹28.3 lakh / 0.05 = ₹5.65 crore. The range ₹5.65–7.1 crore is your retirement corpus target. Use the more conservative ₹7 crore for planning purposes — if markets perform well, you'll simply exceed the target.

Step 4: Calculate Required Monthly SIP to Reach the Target

With the corpus target and years to retirement known, the required monthly SIP works backwards from the future value formula. For a ₹7 crore target, 25 years, 10% CAGR (conservative equity assumption): required monthly SIP ≈ ₹38,500/month. For 30 years at 10%: ≈ ₹22,000/month. For 20 years at 10%: ≈ ₹73,000/month. Now compare this against your existing guaranteed corpus projection (EPF + PPF at maturity). If your EPF alone will be worth ₹2.5 crore at retirement, your SIP needs to generate only ₹4.5 crore — reducing the required monthly SIP to ₹25,000–30,000 over 25 years. This is the retirement target calculation in full — specific, personal, and actionable.