What a ₹1,00,000/month SIP for 25 years actually means
You commit ₹1,00,000 every month into an equity mutual fund or index fund for 25 years straight. By the end you'll have personally contributed ₹3,00,00,000. At a 12% expected long-term return, the compounding effect lifts that to about ₹18,97,63,509 — meaning roughly ₹15,97,63,509 is gain that you didn't have to work for. That's the entire point of a SIP: discipline plus time, multiplied.
Who this plan is suitable for
A ₹1,00,000/month SIP for 25 years is best suited for high-income earners or families with strong cash flow looking to compound aggressively over a decade or more.
Expected outcomes over time
In the first 3–5 years, your portfolio will look almost identical to your invested amount — that's normal, compounding hasn't kicked in yet. Around year 7–10, gains start matching contributions. By year 18, gains will dominate: most of the value sitting in your account is money the market made for you, not money you put in. In this specific scenario, about 52% of all gains arrive in the final 5 years alone.
The impact of inflation
₹18,97,63,509 sounds enormous, but inflation quietly chips away at its purchasing power. Assuming a long-term 6% inflation rate (roughly India's historical average), the real-world value of your final corpus is closer to ₹4,42,14,638 in today's money. Always plan in real terms, not nominal — it's the difference between "I'll be rich" and "I'll have what I actually need."
Recommendation: turn this into a step-up SIP
The single biggest upgrade to this plan is to step up your SIP by 10% every year — matched to your annual salary hike, so it never feels like a sacrifice. Doing that alone would push the corpus to about ₹42,75,54,611 — an extra ₹23,77,91,101 for the same starting commitment. Most fund houses support automatic step-up; turn it on once and forget about it.