Guide · India · Mutual funds
SIP Nominal vs Real CAGR — and Where LTCG Fits (India Guide)
Fund apps display a single CAGR percentage. Serious goal planning needs three layers: nominal growth, tax on gains (LTCG/STCG), and inflation vs your goal's rupees. Here is how to read SIP returns honestly in India.
Test your assumptions: SIP calculator with tax and inflation controls — FD calculator as a low-volatility contrast (different risk, not equivalent)
Disclaimer: Tax law and LTCG rules change via Finance Acts. Equity funds carry capital loss risk. Educational content only — not a recommendation to buy or sell securities.
Quick answer: three layers of SIP return
- Nominal CAGR — rupees in your account.
- Post-tax return — after STCG/LTCG on redemption.
- Real return — after inflation, vs school fees / retirement spend.
A SIP showing 12% nominal CAGR might be 8% post-tax and 4% real if inflation runs hot — plan for the third number.
Nominal CAGR — what it actually measures
Compound annual growth rate on paper tells you how a series of cashflows grew in account rupees. It answers: "If I had invested X each month, what annual rate produces this ending balance?"
It does not guarantee future spending power or net-of-tax wealth.
Real CAGR — inflation-adjusted growth
—Real— return subtracts an assumed inflation path so you compare outcomes to rent, school fees, or retirement expenses — categories that rise with cost of living.
Rough shortcut: real return — nominal return - inflation. A 12% SIP with 6% inflation — 6% real — before tax.
| Nominal SIP CAGR | Inflation | Approx. real (pre-tax) |
|---|---|---|
| 10% | 5% | ~5% |
| 12% | 6% | ~6% |
| 15% | 6% | ~9% |
LTCG on equity mutual funds — intuition
Equity-oriented mutual funds held beyond specified periods may be taxed under long-term capital gains rules. Rates and exemption thresholds have changed in recent Finance Acts — verify current law and your capital gains statement at redemption, not a blog summary.
Key intuition: tax applies to gains, not the entire corpus. Large long-term portfolios can face meaningful tax bills even after —tax-efficient— holding periods.
Real-world example: ₹10,000/month SIP for 15 years
At 12% nominal CAGR, corpus — ₹50 lakh. Total invested = ₹18 lakh; gains — ₹32 lakh.
- Apply current LTCG rules on gains at redemption (verify with CA).
- At 6% inflation, ₹50 lakh in 15 years — ₹20.9 lakh in today's purchasing power (1/(1.06^15)).
- Compare to PPF/ELSS or prepaying a home loan if loan rate exceeds realistic post-tax SIP return.
Best practices for SIP planning
- Model conservative return (9–10%) and test at 7%.
- Include tax and inflation in the SIP calculator.
- Match equity SIP horizon to goals — don't fund a 3-year expense with pure equity SIP.
- Review nominal vs real CAGR yearly; rebalance if goals or risk change.
Common mistakes
- Treating fund app CAGR as guaranteed future return.
- Ignoring LTCG at goal year when sizing target corpus.
- Comparing SIP CAGR to FD headline rate without tax/risk adjustment.
- Stopping SIP during market crashes — often the worst behavioural error.
Frequently asked questions
What is nominal CAGR in SIP?
Growth rate of your investment in rupees, before inflation and tax.
What is real CAGR?
Return after inflation — measures purchasing power growth.
How is LTCG taxed on equity funds?
Rules change — verify at redemption with current law and your statement.