Investment Strategy
Published on September 5, 2025
A systematic investment plan invests a fixed amount at fixed intervals, so its value follows the annuity formula: FV = PMT x (((1 + r)^n - 1) / r), where r is the monthly return and n the number of instalments. Investing 5,000 a month at 12% for 10 years builds 1,150,193 from 600,000 actually invested.
Published by PraxisCalc, a Zeta Digilux Labs project
Want to invest in the market but worried about timing it right? A Systematic Investment Plan (SIP) could be your answer. SIPs are a simple, disciplined approach to investing that allows you to build wealth over time without the stress of trying to predict market movements.
A Systematic Investment Plan is a method of investing a fixed amount of money at regular intervals (usually monthly) into a mutual fund. Instead of investing a large lump sum at once, you invest smaller amounts consistently. This approach has two powerful benefits:
When you invest a fixed amount regularly, you buy more units of a mutual fund when the price is low and fewer units when the price is high. Over time, this averages out your purchase cost and can reduce the impact of market volatility on your investment.
Compounding is the process where your investment returns start earning their own returns. By investing regularly through a SIP, you give your money more time to grow, and the effect of compounding becomes incredibly powerful over the long term.
Ready to see how a SIP can work for you? Use our free, powerful SIP Calculator to project your investment growth and plan for your financial goals.
USE THE SIP CALCULATOR →For those who like to see the math, the future value (M) of a SIP can be calculated using the formula: M = P × ({[1 + i]^n, 1} / i) × (1 + i)
While the formula is useful, our calculator does the heavy lifting for you, providing instant and accurate projections.
A standard SIP keeps your monthly contribution fixed for the entire investment period, but a step-up (or "top-up") SIP increases that contribution by a set percentage every year, typically matched to expected salary growth. The effect compounds: not only does each contribution earn returns, but the contributions themselves grow larger over time, meaningfully accelerating the final corpus compared to a flat SIP of the same starting amount.
For example, a $500 monthly SIP with no step-up and a $500 monthly SIP with a 10% annual step-up start identically, but by year 10 the step-up version is contributing roughly $1,180 per month versus the flat $500, and the total future value difference is typically far larger than the extra amount contributed, because the increased contributions in later years still have meaningful time to grow. The SIP Calculator on this site supports an optional annual step-up percentage, so you can model your own raise schedule directly instead of estimating it by hand.
Tax treatment for SIP investments depends on what the SIP is invested in and how long each individual installment has been held, since every monthly SIP purchase is treated as a separate investment for tax purposes with its own holding period. Equity mutual fund SIPs held over the long-term threshold typically qualify for long-term capital gains treatment on the portion held long enough, while units sold before that threshold are taxed at short-term rates. This means a SIP redeemed as a lump sum may have some units taxed at long-term rates and others at short-term rates, depending on when each specific installment was purchased. Because tax rules and thresholds vary by country and change over time, confirm current capital gains rules with a tax advisor or your plan provider before making redemption decisions based on tax assumptions.
A SIP is an ideal strategy for long-term investors who want to build wealth in a disciplined manner. It removes emotion from investing, leverages the power of compounding, and makes market volatility work in your favor. The best time to start investing was yesterday; the second-best time is today.
The final value of a SIP depends mainly on monthly contribution, expected return, and time invested. Time is especially powerful because each contribution has longer to compound. Increasing your SIP amount each year can also make a large difference, especially as income rises. Avoid focusing only on short-term market movement; SIPs work best when matched to long-term goals.
Use the SIP Calculator for monthly investing and compare it with the SIP vs Lump Sum Calculator when deciding how to deploy existing savings.
For official guidance on this topic, see the SEC's investor education basics.
Use the future value of an annuity formula with a monthly rate. At 12% a year, r is 0.01 and 10 years is 120 instalments. Investing 5,000 a month gives 1,150,193, of which 600,000 is your contributions and 550,193 is growth.
FV = PMT x (((1 + r)^n - 1) / r). This is the ordinary annuity form, which treats each instalment as invested at the end of the month. Some providers quote the annuity due form, multiplying by a further (1 + r) for start-of-month investment, which raises the figure by about 1%.
Rearrange the formula: PMT = FV / (((1 + r)^n - 1) / r). To reach 1,000,000 in 10 years at 12%, you would need roughly 4,347 a month.
A lump sum usually ends higher when markets rise steadily, because every unit compounds for the full period. A SIP does better through a fall and recovery, and it removes the need to pick an entry point. Most people also find a monthly commitment easier to sustain.
Use a rate that matches the fund category rather than a headline figure, and test a lower one. Dropping the example from 12% to 9% reduces the ending value to about 967,600, a difference of nearly 182,600 on identical contributions.
Each instalment starts compounding from the month it is invested, so the earliest instalments do most of the work. This is why extending a SIP by a few years raises the final figure far more than increasing the monthly amount by the same proportion.
For faster estimates, open the SIP calculator and test the numbers with your own assumptions.
Essential tips for understanding and calculating foreign exchange rates.
Analyze the financial factors that determine whether renting or buying is right for you.