What Is a SIP (Systematic Investment Plan)?
A Systematic Investment Plan (SIP) is an investment strategy where you invest a fixed amount of money at regular intervals (usually monthly) into a mutual fund, index fund, or ETF. SIPs harness the power of rupee/dollar cost averaging — by investing consistently regardless of market conditions, you buy more units when prices are low and fewer when prices are high, smoothing out the impact of market volatility over time.
How the SIP Calculator Works
This calculator uses the compound interest formula for recurring investments: FV = P × [{(1 + r)^n – 1} / r] × (1 + r), where P is your monthly investment, r is the monthly rate of return, and n is the total number of months. The calculator assumes returns are compounded monthly and that you make contributions at the beginning of each period.
The Power of Compounding: A Real Example
If you invest $500 per month for 20 years at an average annual return of 10% (the long-term historical average of the S&P 500), your total investment would be $120,000. However, thanks to compound growth, your portfolio would be worth approximately $382,846 — a wealth gain of $262,846. That is the power of starting early and staying consistent.
SIP vs. Lump Sum Investing
Studies show that lump sum investing (investing all your money at once) outperforms SIP/DCA approximately 68% of the time in historical back-tests, because markets tend to go up over time and you want your money invested as early as possible. However, SIPs are psychologically easier — most people don't have a large lump sum available, and SIPs remove the paralysis of trying to “time the market.”
Frequently Asked Questions
What is a good SIP amount to start with?
Any amount is better than nothing. Many brokerages allow SIPs starting at $1 per month. A good rule of thumb is to invest 15-20% of your after-tax income. If that feels too high, start with whatever you can afford and increase it by 10% each year as your income grows.
What return should I expect from a SIP?
Historical returns vary by asset class: Large-cap US index funds (S&P 500) have returned ~10% annually over the long term. International diversified funds may return 7-9%. Bond funds return 3-5%. Use conservative estimates (7-8%) for financial planning.
Is SIP the same as Dollar Cost Averaging (DCA)?
Essentially yes. SIP is the term commonly used in India and Asia for regular periodic investments. Dollar Cost Averaging (DCA) is the same concept used in the US and Europe. Both involve investing a fixed amount at regular intervals regardless of market price.