SIP Calculator — How Systematic Investment Plan Returns Are Calculated
Learn how SIP returns are calculated using compound interest formula. Includes worked examples, year-wise growth table, and SIP vs lump sum comparison.
Introduction
Systematic Investment Plan (SIP) is the most popular way Indians invest in mutual funds — over 7 crore SIP accounts are active today. But how exactly are SIP returns calculated? Unlike a lump sum investment, SIP involves multiple investments over time, each compounding for a different duration. Understanding the math helps you set realistic expectations and choose the right monthly amount.
⚠️ Disclaimer: SIP returns depend on market performance and are not guaranteed. Past returns do not predict future results. Consult a SEBI-registered financial advisor before investing.
What is SIP?
SIP allows you to invest a fixed amount (e.g., ₹5,000) into a mutual fund every month. Each installment buys units at the current NAV (Net Asset Value). Over time, you benefit from:
- Rupee cost averaging — buying more units when prices are low
- Compounding — returns on returns over long periods
- Discipline — automated monthly deductions prevent emotional decisions
The SIP Formula
M = P × ((1 + i)^n – 1) / i × (1 + i)
Where:
- M = Maturity value (total corpus)
- P = Monthly SIP amount (₹)
- i = Monthly rate of return (annual rate ÷ 12 ÷ 100)
- n = Total number of months
Worked Example: ₹5,000/month for 5 years at 12% annual return
- P = 5,000
- i = 12% ÷ 12 = 1% = 0.01
- n = 5 × 12 = 60 months
M = 5000 × ((1.01^60 – 1) / 0.01) × 1.01 M = 5000 × ((1.8167 – 1) / 0.01) × 1.01 M = 5000 × (0.8167 / 0.01) × 1.01 M = 5000 × 81.67 × 1.01 M = ₹4,12,432
Total invested: ₹5,000 × 60 = ₹3,00,000 Returns earned: ₹4,12,432 – ₹3,00,000 = ₹1,12,432
Year-wise SIP Growth (₹5,000/month at 12%)
Here’s how your SIP grows year by year (i = 0.12/12 = 0.01):
| Year | Months (n) | Total Invested | Maturity Value (M) | Returns Earned |
|---|---|---|---|---|
| 1 | 12 | ₹60,000 | ₹63,412 | ₹3,412 |
| 3 | 36 | ₹1,80,000 | ₹2,17,499 | ₹37,499 |
| 5 | 60 | ₹3,00,000 | ₹4,12,432 | ₹1,12,432 |
| 7 | 84 | ₹4,20,000 | ₹6,61,226 | ₹2,41,226 |
| 10 | 120 | ₹6,00,000 | ₹11,61,695 | ₹5,61,695 |
Notice how returns accelerate with time — in the first year you earn just ₹3,412, but from year 7 to year 10 you earn over ₹5 lakh in returns alone. This is the power of compounding.
SIP Returns Comparison Table
Assuming 12% annual returns (historical equity fund average):
| Monthly SIP | 5 Years | 10 Years | 15 Years | 20 Years |
|---|---|---|---|---|
| ₹1,000 | ₹82,486 | ₹2,32,339 | ₹5,01,695 | ₹9,89,357 |
| ₹3,000 | ₹2,47,459 | ₹6,97,018 | ₹15,05,086 | ₹29,68,071 |
| ₹5,000 | ₹4,12,432 | ₹11,61,695 | ₹25,08,476 | ₹49,46,785 |
| ₹10,000 | ₹8,24,864 | ₹23,23,391 | ₹50,16,953 | ₹98,93,571 |
Key insight: ₹10,000/month for 20 years at 12% grows to nearly ₹1 crore — the power of compounding over time.
SIP vs Lump Sum Comparison
| Feature | SIP | Lump Sum |
|---|---|---|
| Investment style | Fixed monthly | One-time |
| Market timing risk | Reduced (rupee cost averaging) | High (entire amount at one NAV) |
| Minimum amount | ₹500/month | ₹5,000+ typically |
| Best for | Salaried individuals | Windfall/bonus money |
| Discipline | Automated, consistent | Requires active decision |
| In rising markets | Lower returns than lump sum | Higher returns |
| In volatile markets | Better risk management | Higher risk |
Common Mistakes
- Expecting fixed returns — 12% is an assumption; actual returns vary year to year
- Stopping SIP during market crashes — crashes are when you buy more units cheaply
- Ignoring expense ratio — fund fees reduce your effective return by 0.5-2.5% annually
- Not increasing SIP amount — a yearly 10% step-up significantly boosts final corpus
- Confusing CAGR with absolute returns — a fund showing “80% returns” over 5 years is ~12.5% CAGR, not 80% per year
Frequently Asked Questions
What is a good monthly SIP amount to start with?
Most financial planners suggest investing at least 20-30% of your monthly income. Even ₹500/month is a valid starting point — you can increase over time with step-up SIP.
Can I withdraw my SIP investment anytime?
Open-ended mutual fund SIPs can be redeemed anytime (subject to exit load in first year). ELSS (tax-saving) SIPs have a 3-year lock-in per installment.
Is SIP return guaranteed at 12%?
No. 12% is a commonly used assumption based on historical Nifty 50 returns over 15+ years. Actual returns vary — some years may be negative, others 20%+.
What happens if I miss a SIP installment?
Most AMCs allow 3 consecutive missed payments before cancelling the mandate. You don’t lose existing investments — just that month’s installment is skipped.
Should I choose growth or dividend option for SIP?
Growth option is better for wealth building — returns are reinvested and compounded. Dividend option pays out periodically but reduces compounding benefit.
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