How to Calculate Your Retirement Corpus
Step 1: Inflation-adjusted future expense = Current monthly expense × (1 + inflation)^years Step 2: Corpus needed = Inflation-adjusted annual expense × 25 (4% rule) or × 29–33 (3–3.5% rule for India) Step 3: Monthly SIP = PMT formula using target corpus, return rate, and years to retirement
Example: ₹60,000/month expenses today, retiring in 25 years, 6% inflation, 12% SIP return: Future expense = ₹60,000 × (1.06)²⁵ = ₹2,57,337/month → ₹30.88 lakh/year Corpus needed = ₹30.88 lakh × 25 = ₹7.72 crore Monthly SIP required = ~₹24,500/month
Delay retirement planning by 5 years (start at 35 instead of 30) and the required SIP nearly doubles to ~₹45,000/month — the compounding penalty for waiting.