SIP returns use the future value of an annuity formula, which accounts for each monthly contribution compounding independently from the date it was invested. The standard formula is:
FV = P × [((1 + r)n − 1) / r] × (1 + r)
Where:
- FV = Future Value (maturity amount)
- P = Monthly SIP amount
- r = Monthly rate of return (annual rate / 12)
- n = Total number of monthly instalments
Example: Rs 10,000 Monthly SIP at 12% for 10 Years
- Monthly investment (P): Rs 10,000
- Annual return: 12%, so monthly rate (r): 12% / 12 = 1% = 0.01
- Duration: 10 years = 120 months (n)
- Total invested: Rs 10,000 × 120 = Rs 12,00,000
- FV = 10,000 × [((1.01)120 − 1) / 0.01] × 1.01
- FV = 10,000 × [2.30 / 0.01] × 1.01
- FV ≈ Rs 23,23,391
- Wealth gained: Rs 23,23,391 − Rs 12,00,000 = Rs 11,23,391
This means your Rs 12 lakh investment nearly doubles to Rs 23.23 lakh in 10 years at 12% CAGR. Use our compound interest calculator to see how lump sum compounding compares to SIP compounding over the same period.
Step-Up SIP vs Regular SIP: The Power of Annual Increases
A step-up SIP (also called a top-up SIP) increases your monthly contribution by a fixed percentage every year. Since most people’s income grows annually, stepping up your SIP by 10-15% each year is realistic and dramatically accelerates wealth creation.
The difference is staggering. A 10% annual step-up turns Rs 24 lakh into Rs 68.73 lakh of total investment, but the maturity value jumps from Rs 1 crore to over Rs 2.63 crore — a 2.6x increase in final corpus from disciplined annual increases. A 15% step-up pushes the maturity past Rs 4.17 crore.
According to our analysis, investors who use step-up SIPs reach their retirement corpus 5-8 years earlier than those who keep a flat SIP. Model your own step-up scenario with the WOWHOW SIP calculator — it shows both regular and step-up projections side by side.
Tax Implications: LTCG, STCG, and What You Actually Keep
Your SIP maturity value is not what you take home — taxes reduce the final amount. Here is how equity mutual fund taxation works in India as of FY 2025-26:
Short-Term Capital Gains (STCG)
If you redeem mutual fund units held for less than 12 months, the gains are taxed at 20% (increased from 15% in the Union Budget 2024). This applies per unit, not per SIP — so early SIP instalments may qualify for LTCG while recent ones attract STCG.
Long-Term Capital Gains (LTCG)
Units held for more than 12 months qualify for LTCG treatment. The tax structure:
- Gains up to Rs 1.25 lakh per financial year are tax-free (increased from Rs 1 lakh in Budget 2024)
- Gains above Rs 1.25 lakh are taxed at 12.5% (increased from 10% in Budget 2024)
- No indexation benefit for equity mutual funds
Example: Tax on Rs 23.23 Lakh SIP Maturity
From our earlier example (Rs 10,000/month SIP for 10 years at 12%):
- Total invested: Rs 12,00,000
- Maturity value: Rs 23,23,391
- Total gain: Rs 11,23,391
- Tax-free allowance: Rs 1,25,000
- Taxable gain: Rs 11,23,391 − Rs 1,25,000 = Rs 9,98,391
- LTCG tax at 12.5%: Rs 9,98,391 × 0.125 = Rs 1,24,799
- Post-tax maturity: Rs 23,23,391 − Rs 1,24,799 = Rs 21,98,592
Your effective tax rate on total gains is approximately 11.1%. Many investors overlook this and are surprised at redemption time. Planning your withdrawals across financial years can help you maximize the Rs 1.25 lakh annual exemption — for example, redeeming in March and April across two financial years doubles your tax-free allowance to Rs 2.5 lakh.
SIP vs Other Investment Options in India
How does SIP in equity mutual funds compare to other popular Indian investment instruments? Here is a realistic comparison based on historical returns and current tax rules:
For a complete retirement picture, use our retirement calculator to model how SIP, PPF, and NPS work together. You can also compare PPF returns using our PPF calculator and NPS projections with the NPS calculator.
5 Mistakes to Avoid When Using a SIP Calculator
- Using unrealistic return expectations — Equity mutual funds have historically delivered 12-14% CAGR over 10+ year periods in India, but past performance does not guarantee future returns. Use 10-12% for conservative planning.
- Ignoring inflation — Rs 1 crore in 20 years is worth roughly Rs 37 lakh in today’s purchasing power at 5% inflation. Always calculate your real (inflation-adjusted) returns.
- Forgetting about taxes — The maturity amount shown by most calculators is pre-tax. Subtract LTCG tax to get your actual take-home amount.
- Not accounting for expense ratios — Fund expense ratios (0.5-2.5%) reduce your effective returns. A fund with 12% gross returns and a 1.5% expense ratio delivers only 10.5% net returns.
- Stopping SIPs during market crashes — This is the worst time to stop. Market dips are when your SIP buys units at lower prices, boosting long-term returns through rupee cost averaging.
How to Use the WOWHOW SIP Calculator
Our free SIP calculator is designed for Indian investors who want accurate, no-nonsense projections. Here is how to use it:
- Enter your monthly SIP amount — Start with what you can comfortably invest. Even Rs 500/month compounds meaningfully over 15-20 years.
- Set the expected annual return rate — Use 10% for conservative large-cap funds, 12% for diversified multi-cap, and 14% for aggressive small/mid-cap exposure.
- Choose the investment duration — Longer horizons amplify compounding. A 20-year SIP generates significantly more wealth than two separate 10-year SIPs of the same amount.
- Enable step-up SIP (optional) — Set an annual increase percentage (we recommend 10% to match average salary growth) to model realistic wealth accumulation.
- Review your results — The calculator shows total invested, estimated returns, maturity value, and a visual growth chart. Compare scenarios by adjusting inputs.
All calculations happen in your browser — no data is sent to any server. Bookmark the page and use it whenever you need to re-model your investment strategy.
Frequently Asked Questions
What is the best SIP amount to start with in 2026?
There is no universal “best” amount — it depends on your income and goals. However, financial advisors commonly recommend investing at least 20% of your take-home salary through SIPs. For a person earning Rs 50,000/month, that means starting with Rs 10,000/month. The key is consistency: a Rs 5,000 SIP maintained for 20 years beats a Rs 15,000 SIP maintained for 5 years.
Is SIP better than lump sum investment?
Historically, lump sum investing outperforms SIP about 65% of the time in rising markets because the entire amount compounds from day one. However, SIPs outperform during volatile or declining markets due to rupee cost averaging. For most salaried individuals who invest from monthly income rather than a lump sum, SIP is the practical and psychologically easier choice.
Can I lose money in SIP?
Yes, SIPs in equity mutual funds carry market risk. In any given 1-3 year period, you could see negative returns. However, based on historical data from BSE Sensex and Nifty 50, no SIP held for 10+ years has ever delivered negative returns in India. Time in the market is your best protection against losses.
How is SIP different from a recurring deposit?
A recurring deposit (RD) offers guaranteed but lower returns (6-7%) and is fully taxable. SIPs in equity mutual funds offer potentially higher returns (10-14%) with market risk, and enjoy more favourable tax treatment through LTCG exemptions. Use our FD calculator to compare fixed-income returns against SIP projections.
Start planning your SIP today with the WOWHOW SIP & EMI Calculator — free, instant, and completely private. For a comprehensive retirement plan, combine it with our NPS calculator, PPF calculator, and retirement calculator to model your entire investment portfolio.
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