What Return Rate Should You Use for SIP Planning? Not 15%.
Published 30 June 2026 · Investing
Pooja in Chennai sat across from her relationship manager, who slid a projection across the table showing her ₹5,000/month SIP growing to ₹1.2 crore in 20 years. The fund fact sheet said 18% CAGR. The manager pointed to it as evidence. Pooja did not know that the 18% was a 3-year number during one of the strongest bull runs in Nifty history. For 20-year planning, that number is meaningless — and potentially dangerous.
What Nifty 50 SIPs Have Actually Returned: Rolling Period Analysis
The most honest way to look at historical returns is rolling periods — every possible 5-year, 10-year, 15-year, and 20-year SIP window from 1995 to 2024. This removes the selection bias of choosing one start date that happened to work well.
| Rolling Period | Min CAGR | Median CAGR | Max CAGR |
|---|---|---|---|
| 5 years | –3.1% | 11.8% | 27.4% |
| 10 years | 4.2% | 12.4% | 19.6% |
| 15 years | 7.2% | 12.1% | 18.4% |
| 20 years | 8.9% | 11.7% | 16.2% |
Three things stand out. First, no 15-year Nifty 50 SIP period in history has given a negative return — the worst was 7.2%. Second, the median across 15-year periods is 12.1% — not 18%, not 15%. Third, the max across 20-year periods is 16.2%, not 25%. The fund showing 18% CAGR was in the max territory of a short period. That is not a planning number; that is a lottery ticket result.
The Cost of Planning at the Wrong Rate
₹5,000/month for 20 years — here is the corpus difference based purely on the return assumption:
At 10%: ₹38.3L. At 12%: ₹49.9L. At 15%: ₹75.8L.
If Pooja planned at 15% and received 10%, her corpus shortfall would be ₹37.5L — nearly a full "expected" corpus. She planned for a house downpayment goal of ₹75L; she arrived at ₹38L. That is the real-world consequence of anchoring on optimistic return assumptions. The error margin should always work in your favour: plan conservatively, be pleasantly surprised.
Run this for your own numbers
Run SIP at Realistic Rates →What Most People Get Wrong
They anchor on the last 3–5 year performance of a specific fund, not the long-run rolling data. Bull market funds show 25–30% returns in fund fact sheets during a strong run — Nifty 50 returned 28% in CY2023 alone. Those 3-year numbers are real, but they are also mean-reverting. For 20-year SIP planning, the only relevant numbers are 15–20 year rolling returns on diversified equity indices. Even the fund category matters less than the assumption rate: a mid-cap fund at an assumed 14% that delivers 11% is worse for your plan than a large-cap index fund at an assumed 10% that delivers 11%. Match your assumptions to history, not to recent headlines.
Frequently Asked Questions
What is a realistic SIP return rate for planning in India?
For large-cap equity funds tracking Nifty 50: 10–12% CAGR over 15+ years is realistic. For mid-cap funds: 12–14%. For planning purposes, use 10% for conservative estimates and 12% for moderate. Never plan at 15%+ for the base case.
What is the historical Nifty 50 SIP return?
For any 15-year SIP period in Nifty 50 (from 1995 to 2024), the minimum CAGR was 7.2%, the maximum was 18.4%, and the median was approximately 12.1%. No 15-year period has given a negative SIP return.
Why should I not use 15% as my SIP return assumption?
15% CAGR is the top quartile outcome for Nifty 50 SIPs, not the median. Planning at 15% means underestimating the corpus you need to save — if returns are 10% instead, your corpus shortfall is substantial. Reverse the error margin: plan conservatively, be pleasantly surprised.
What happens to SIP returns in a bear market?
Bear markets actually help SIP investors — you buy more units at lower prices. This is the averaging benefit of SIP. The ₹5,000/month stays fixed; in a bear market you buy more units per rupee. When the market recovers, the extra units you bought cheaply generate higher returns.
Which mutual fund category gives the best SIP returns in India?
Historically (15-year CAGR, 2010–2024): mid-cap index funds ~14%, large-cap index funds ~12%, multi-cap funds ~12–13%, flexi-cap funds ~11–13%. Small-cap funds have given 15%+ but with much higher volatility. For stable planning, large or flex-cap index funds are recommended.
What return rate is your SIP projection using — and have you checked what your corpus looks like at 10% instead of the assumed rate?