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SIP Explained: How Rupee-Cost Averaging and Compounding Build Wealth

How SIPs work, what they can and cannot do, and how much to invest.

✍️ FinancePortal Editorial📅 Published 27 Sep 2026🔄 Updated 28 Sep 2026⏱️ 2 min read
In this guide
7 sections
2 FAQs · 2 min read
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SIP Explained: How Rupee-Cost Averaging and Compounding Build Wealth

A Systematic Investment Plan (SIP) invests a fixed amount in a mutual fund at regular intervals. India had more than 10 crore active SIP accounts and monthly SIP inflows of about ₹32,297 crore in August 2026.

Key takeaways

  • SIPs buy more units when prices fall and fewer when they rise (rupee-cost averaging).
  • Discipline and time — not market timing — drive most SIP results.
  • A step-up SIP that rises with income can dramatically increase the final corpus.
  • SIPs reduce timing risk but do not remove market risk.

Rupee-cost averaging example

MonthInvestedNAVUnits
1₹5,000₹50100.00
2₹5,000₹40125.00
3₹5,000₹45111.11
Total₹15,000Avg cost ₹44.63336.11

The average cost (₹44.63) is lower than the average NAV (₹45).

What a ₹10,000 monthly SIP can grow to (assumed 12% p.a.)

YearsInvestedEstimated value
5₹6 lakh≈ ₹8.2 lakh
10₹12 lakh≈ ₹23.2 lakh
15₹18 lakh≈ ₹50.5 lakh
20₹24 lakh≈ ₹99.9 lakh

With a 10% yearly step-up, 15 years of SIP starting at ₹10,000 grows to about ₹86.8 lakh at the same assumed return.

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Choosing the SIP amount

  1. Define the goal and its future cost (adjust for inflation).
  2. Use the goal SIP calculator.
  3. Start with what you can sustain; step up every year.

Common mistakes

  • Stopping SIPs when markets fall — that is when averaging helps most.
  • Too many funds with overlapping portfolios.
  • Choosing funds on last year's return.

Your action checklist

  1. Define the goal, horizon and risk you can take.
  2. Pick the category first, then compare 2–3 funds on consistency and cost.
  3. Prefer direct plans if you do not need a distributor.
  4. Start a SIP with auto-debit and step it up yearly.
  5. Review once a year and rebalance instead of reacting to short-term moves.
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FAQs

Which date is best for a SIP?

Over long periods the date makes little difference; choose one soon after salary credit.

Can I pause a SIP?

Most AMCs allow a pause for a few months.

Use the SIP calculator and read our SIP guide.

Tools & guides for this topic

Editorial note: This guide is for education and comparison. Rates, fees, eligibility and tax rules change — verify the latest terms with the bank, issuer, AMC or regulator before you act. FinancePortal does not provide personalised financial advice.

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