SIP Calculator: How Monthly Investments Build Wealth in India

6 min read

Why SIP Is the Most Powerful Wealth Tool for Salaried Indians

A Systematic Investment Plan (SIP) lets you invest a fixed amount every month into a mutual fund — automatically, without timing the market. It sounds simple, but the results over a decade or more are remarkable. A Rs 10,000 monthly SIP at 12% annual return for 20 years grows to over Rs 99 lakh from just Rs 24 lakh invested.

Use our SIP Calculator to model your own numbers instantly.

How SIP Compounding Works

Each instalment you invest starts earning returns. The next month, those returns also earn returns. This is compound interest — and it accelerates dramatically over time.

The formula for SIP maturity value is:

M = P × [((1 + r)^n − 1) / r] × (1 + r)

Where P = monthly SIP amount, r = monthly return rate, n = total months.

Time Is the Real Variable

Starting 5 years earlier can more than double your corpus. A Rs 5,000/month SIP at 12% started at age 25 vs age 30 creates a difference of over Rs 50 lakh by retirement at 60 — with the same total additional investment of just Rs 3 lakh.

Rupee Cost Averaging: Why Market Dips Help SIP Investors

When markets fall, your fixed SIP buys more units at lower prices. When they recover, those extra units generate higher gains. This automatic buying-more-at-lows effect is called rupee cost averaging, and it makes SIP psychologically and mathematically superior to trying to time the market.

Step-Up SIP: Boost Returns Without More Effort

Most fund platforms allow a step-up SIP — automatically increasing your monthly amount by 10–15% each year. If your Rs 10,000 SIP increases by 10% annually for 20 years, your corpus can reach over Rs 2 crore instead of Rs 99 lakh. The difference is simply matching your investments to your salary growth.

Which Mutual Funds Work Best for SIP?

  • Nifty 50 Index Funds— Low cost (0.1–0.2% expense ratio), tracks India's top 50 companies. Ideal for beginners and long-term investors.
  • Flexi-Cap Funds — Fund manager picks across market caps. Suitable for 7+ year horizons.
  • Mid-Cap Funds — Higher return potential, higher volatility. Best for risk-tolerant investors with 10+ year outlook.

Pair your SIP strategy with our FD vs Mutual Fund Calculator to compare lump-sum alternatives.

SIP vs Lump Sum: Which Should You Choose?

For most salaried Indians, SIP wins — you invest as income arrives, reduce timing risk, and build discipline automatically. Lump sum investing makes sense only if you have a large unused corpus and strong conviction that markets are undervalued.

Tax on SIP Returns

Equity mutual fund gains held over 12 months are taxed at 10% LTCG above Rs 1.25 lakh per year. Gains below that threshold are tax-free. This makes equity SIPs significantly more tax-efficient than fixed deposits, where interest is fully taxable at your slab rate.

Getting Started: 3 Steps

  1. Open a mutual fund account via any direct platform (Zerodha Coin, Groww, etc.)
  2. Pick a low-cost index fund or flexi-cap fund with a strong 5-year track record
  3. Set a monthly SIP — even Rs 500 counts — and increase it every year

Ready to see your numbers? Try the SIP Calculator →

Frequently Asked Questions

How does SIP compounding work?
Each monthly SIP instalment earns returns on top of previous returns. Over long periods this produces a snowball effect — a Rs 10,000/month SIP at 12% for 20 years grows to over Rs 99 lakh, from just Rs 24 lakh invested.
What is a good SIP amount to start with in India?
Even Rs 500/month in an index fund is a great start. A practical rule: invest 20% of your take-home pay. As income grows, increase the SIP amount annually by 10–15% (step-up SIP).
Is SIP better than a lump sum investment?
SIP reduces timing risk through rupee cost averaging — you buy more units when markets fall. Lump sum wins if you invest at a market low. For salaried individuals, SIP is generally the safer and more practical option.
Which mutual funds are best for SIP in India 2026?
Index funds (Nifty 50, Nifty Next 50) offer low-cost broad market exposure. Flexi-cap and mid-cap funds can deliver higher returns with added risk. Always match the fund risk profile to your risk tolerance and time horizon.
Try a calculator →