Why Two SIP Investors in the Same Fund Report Different Returns

You've put your money into a Systematic Investment Plan (SIP). Perhaps your friend also invested in the exact same mutual fund, using a SIP. But when you both check your investment apps, you see different returns! This can be confusing and make you wonder how to check mutual fund performance in India properly. Don't worry, this isn't a mistake or a trick. There are clear, simple reasons why your SIP returns might look different from someone else's, even in the same fund.

The Mystery of Different SIP Returns

It's a common puzzle: same fund, same SIP amount, but different return numbers. The main reason for this difference comes down to timing. Every SIP installment buys units of a mutual fund at its current Net Asset Value (NAV). The NAV changes every single market day. If you and your friend started your SIPs on different dates, or even just have different monthly investment dates, you bought units at different NAVs over time. This leads to different average purchase prices for your units.

Rupee Cost Averaging: Your Friend and Foe

One of the biggest benefits of a SIP is called rupee cost averaging. This means you buy more units when the market (and NAV) is low and fewer units when the market (and NAV) is high. Over time, this helps average out your purchase price. But it also means that your specific entry points into the market are unique to your investment dates.

Imagine two investors, Priya and Sameer. Both invest 1,000 rupees every month into the same fund. But Priya started her SIP in January, and Sameer started his in February.

Even after just two months of investments, Priya has bought units at 100 and 90, while Sameer has only bought at 90. Their average purchase prices are already different. This difference grows over many months and years.

When Did You Start Investing? Why It Matters

The biggest factor in different returns is usually the start date of your SIP. If one person started their SIP three years ago and another started just one year ago, their overall market exposure is completely different. The market goes through ups and downs.

An investor who started their SIP during a market low will have bought many units at cheaper prices. If the market then rose, their returns would look very good. Another investor who started during a market peak might have bought units at higher prices, and their initial returns might look lower or even negative for some time. Even if they both invest the same total amount, the timing of those investments changes everything.

How Are Mutual Fund Returns Calculated? (It's Not Always Simple)

Another reason for different numbers could be the way returns are calculated. There are a few ways to measure investment performance:

• Absolute Return: This is the simplest. It's just the percentage gain or loss from your total investment to its current value. It works well for a single lump sum investment over a short period (less than one year). But for SIPs with many investment dates, it's not very helpful.
• CAGR (Compounded Annual Growth Rate): This tells you the average yearly growth rate over more than one year, assuming you made a single lump sum investment. While useful for comparing funds over longer periods, it's not accurate for SIPs because it doesn't account for money being added over time.
• XIRR (Extended Internal Rate of Return): This is the most accurate way to measure returns for SIPs. XIRR considers every single cash flow (each SIP installment) and its exact date. It then calculates a single annualized rate of return that truly reflects your investment journey. Most investment apps and fund houses use XIRR for SIPs because it gives the most realistic picture.

Example Scenario: You might see a friend quoting an "absolute return" based on their initial investment, while your app shows an "XIRR" that accounts for all your monthly payments. These numbers are calculated differently, so they will naturally be different.

How to Check Mutual Fund Performance in India Accurately

To truly understand your SIP performance and compare it fairly, focus on these points:

1. Look for XIRR: Always check the XIRR when reviewing your SIP returns. This is the gold standard for SIPs. Your fund house statements or investment app should show this clearly.
2. Compare Apples to Apples: If you want to compare your SIP performance with someone else's, ensure these things are the same:
   • Same Fund: Obvious, but crucial.
   • Same Start Date: This is key.
   • Same Monthly Investment Amount: If the amounts differ, the number of units bought at various NAVs will also differ, affecting the overall average.
   • Same Duration: The period of investment should be identical.
3. Use Fund House Statements: Your official statements from the mutual fund house will provide the most accurate details of your investments, including your XIRR.
4. Check Official Sources for Fund Data: For general fund performance data, like historical NAVs or scheme details, you can visit reliable sources. For example, the AMFI India website provides official NAV history for all mutual funds. This helps you understand how the fund itself has performed over time, separate from your personal SIP calculations.
5. Understand Your Goals: Remember why you started your SIP. Your financial goals are unique. The main purpose of a SIP is to build wealth over the long term, not just to match someone else's short-term numbers.

What You Can Learn From This

The fact that two SIP investors in the same fund can report different returns is a feature, not a bug, of how SIPs work. It highlights the power of rupee cost averaging and the importance of individual investment timelines. Don't let differing numbers confuse you. Instead, focus on your own investment journey and ensure you are tracking your performance accurately using XIRR.

SIPs are designed to help you invest regularly and benefit from market movements over time. By understanding how your returns are calculated and what factors influence them, you gain confidence in your investment strategy. Your investment path is unique, and so are your returns. Keep investing consistently, and your SIP will work its magic for your financial future.