What Is a SIP? A Plain-English Definition (With a Real Example)
TL;DR: A SIP (Systematic Investment Plan) is a fixed amount invested automatically into a mutual fund at regular intervals — usually monthly — instead of investing a lump sum all at once. It's the most common way retail investors in India build long-term wealth in equity markets, and the same "recurring investment" concept exists worldwide under different names (a recurring brokerage transfer, a dollar-cost-averaging plan, an automatic investment plan).
How does a SIP actually work?
You commit to investing a fixed amount — say ₹10,000 — on a fixed date every month, into a mutual fund of your choice. That amount buys fund units at whatever the price ("NAV," or net asset value) is that day. Over time, this means you automatically buy more units when prices are low and fewer when prices are high — a mechanical effect called rupee-cost averaging (or dollar-cost averaging in other markets) that removes the temptation to time the market.
A worked example
₹10,000 invested every month for 20 years, assuming a 12% annual return (a commonly used long-run assumption for diversified equity funds, though real returns vary year to year):
| Total invested | Estimated value | Estimated gain |
|---|---|---|
| ₹24,00,000 | ≈ ₹99,91,000 | ≈ ₹75,91,000 |
Most of the final value comes from compounding in the later years, not the early ones — which is also why starting a SIP earlier matters more than almost any other single decision in the calculation.
Is a SIP the same as a mutual fund?
No — a SIP is a way of investing into a mutual fund (or other eligible instrument), not a product itself. You could invest the same amount as a single lump sum instead of a SIP; the fund is the same, only the timing of your cash flow differs.
What's the minimum SIP amount?
In India, many mutual funds allow SIPs starting from ₹500/month, though ₹1,000–₹5,000/month is more typical for a meaningful long-term goal. The equivalent recurring-investment minimum elsewhere depends on the brokerage or platform.
Try it with your own numbers
Run your own monthly amount, expected return, and time horizon through our SIP Calculator — it shows the year-by-year breakdown, not just the final number, plus how a step-up (increasing your SIP amount each year) changes the outcome.