How a SIP actually compounds
Every SIP instalment buys units at the next available NAV. Over time you average across market highs and lows — what the industry calls rupee-cost averaging. Per AMFI data the Indian mutual fund industry crossed ₹68 lakh crore in AUM in 2025, and SIP inflows alone now exceed ₹25,000 crore a month, the bulk of it from retail investors.
The compounding is monthly: at a 12% annual return, your monthly compounding rate is roughly 0.949%. A ₹10,000 SIP at this rate puts in ₹18 lakh of your own money over 15 years and produces a final value of around ₹50 lakh — meaning gains contribute nearly two-thirds of the corpus. Stretch the same SIP to 25 years and the ratio flips dramatically: invested capital becomes a small fraction of the final value.
Choosing a realistic return assumption
Equity mutual funds in India do not deliver a flat 12% every year. Index funds tracking Nifty 50 have produced rolling 10-year CAGRs typically between 9% and 14%. SEBI mandates a Riskometer label on every scheme — the higher you go on the risk scale (mid-cap, small-cap, sectoral), the wider your range of outcomes.
Use 10% for a conservative plan, 12% as a planning default, and 14% only if you fully understand mid- and small-cap volatility — which can include 30–40% drawdowns. For shorter horizons (under 7 years), reduce the assumption further; equity returns over short windows are noisy.
Step-up SIP — why it matters more than a higher return
An annual step-up (also called top-up) raises your SIP by a fixed percentage every year, usually aligned to salary increments. A 10% annual step-up on a ₹10,000 SIP becomes ₹26,000 in year 10 and roughly doubles the final corpus versus a flat SIP. AMFI distributor data shows that step-up adoption among salaried SIP investors is still under 20% — most leave the option unused.
Practically, this matters because most investors increase consumption with each raise rather than investments. Automating the step-up at SIP registration removes the decision from your monthly cash-flow battle.
Direct vs Regular: where PSS Ventures stands
Direct plans have lower expense ratios because no distributor commission is paid. We are an AMFI-registered Mutual Fund Distributor (MFD) — we transact in Regular plans, and our economics are 100% trail commission from the AMC. You pay us nothing. On every scheme page we disclose the expense-ratio gap between Direct and Regular so you can weigh the trade-off honestly.
The decision is yours: Direct if you are confident managing scheme selection, rebalancing, and tax harvesting on your own; Regular if you value a local advisor walking you through the journey — especially through bear markets, when most SIP cancellations happen.
What this SIP calculator does and does not do
It computes the future value using monthly compounding and an assumed flat return. It does not model: equity market drawdowns, sequence-of-returns risk, exit loads (typically 1% if redeemed within 365 days for equity funds), STT/STT-A, dividend distribution tax (now taxed in the hands of the investor), or LTCG (12.5% above ₹1.25 L/year of equity gains under the post-FY24-25 regime).
For a more complete plan — including the scheme selection, tax wrapper choice and goal mapping — request a callback. Our advisor will run a sensitised plan with 8%, 10%, 12% and 14% return paths so you see the full envelope of outcomes.