What is SIP & How It Works
Definition
A Systematic Investment Plan (SIP) is a disciplined method of investing a fixed amount of money at regular intervals — typically monthly — into a mutual fund scheme. Each month the AMC auto-debits the chosen amount from the investor's bank account, purchases units at the prevailing NAV (Net Asset Value), and adds them to the investor's folio. Over time, units accumulate and grow through market appreciation, making SIP the most practical wealth-building habit for Indian investors.
In Simple Words
Over the past two decades, investors have consistently struggled with one question — "When is the right time to invest?" SIP eliminates that question entirely. Here is the simple chain of events that runs every single month once it is set up: (1) On the chosen SIP date, the amount is auto-debited from the investor's savings account via NACH or OTM mandate. (2) The Registrar and Transfer Agent (CAMS or KFintech) processes the order. (3) Units are allotted based on the applicable NAV — for equity funds this is the NAV of the same business day if money arrives before 3 PM, otherwise the next day's NAV. (4) Units appear in the folio, typically on T+1 basis. (5) The cycle repeats month after month, compounding quietly in the background. The beauty of this mechanism is that no demat account is needed, no market monitoring is required, and there is no need to remember to invest. The bank, the AMC, and the registrar handle everything. All that is needed is the discipline to let the mandate run. Industry experience consistently shows that investors who create wealth are not the smartest — they are the most consistent.
Real-Life Scenario
Priya is a 28-year-old software engineer in Bangalore earning ₹80,000 per month. She feels intimidated by the stock market but knows fixed deposits will not beat inflation. Her colleague suggests starting a SIP. Priya opens a mutual fund account on a platform, selects a Nifty 50 index fund, and sets up a ₹10,000 monthly SIP on the 5th of every month. In month one, the NAV is ₹50 — she receives 200 units. In month two the market drops and the NAV falls to ₹40 — she receives 250 units. In month three the market bounces to ₹60 — she gets 166.67 units. After just three months Priya has invested ₹30,000 and holds 616.67 units at an average cost of ₹48.65 per unit — lower than both the starting and ending NAV. She did not need to study any chart or listen to any market pundit. The SIP mechanism did the heavy lifting.
Key Points to Remember
Formula
SIP Future Value = P × [((1 + r)^n - 1) / r] × (1 + r) Where: P = Monthly SIP amount r = Monthly rate of return (annual return ÷ 12) n = Total number of SIP installments (years × 12)
Numerical Example
Monthly SIP: ₹10,000 | Expected Return: 12% p.a. | Duration: 20 years Step 1: Monthly rate (r) = 12% ÷ 12 = 1% = 0.01 Step 2: Total months (n) = 20 × 12 = 240 Step 3: FV = 10,000 × [((1.01)^240 - 1) / 0.01] × (1.01) FV = 10,000 × [(10.8926 - 1) / 0.01] × 1.01 FV = 10,000 × 989.26 × 1.01 FV = ₹99,91,479 ≈ ₹1 Crore Total Amount Invested: ₹24,00,000 (₹24 Lakhs) Wealth Gained via Compounding: ₹75,91,479 (₹75.9 Lakhs) Final Value: ≈ ₹1 Crore Key takeaway: Over 76% of the final corpus came from compounding, not from your pocket.
Frequently Asked Questions
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What does SIP stand for?
Summary Notes
SIP is the simplest and most effective way to invest in mutual funds — set it up once and let compounding work for decades
Even ₹10,000 per month at 12% return can grow to approximately ₹1 Crore in 20 years
SIP removes the two biggest investing mistakes — procrastination and panic — by automating the entire process
The mechanism is fully hands-free: NACH mandate → auto-debit → unit allotment → folio accumulation
Industry data suggests that 90% of SIP success comes from simply not stopping — the remaining 10% is fund selection