Ever looked at your portfolio and felt like the math just doesn't add up?

You see green numbers next to your stock. It’s genuinely up - your broker confirms it. But your total "Invested vs Current Value"? You’re actually down money.

This isn't a glitch. It’s because most investors use the word "Return" for three completely different questions.

The Paradox: A Simple Example

Imagine this scenario (happens more often than you think):

1. Jan 1: You invest Rs 100,000 in a stock.
2. April 1: The stock goes up 10%. You feel like a genius and decide to go "all in."
3. April 1: You deposit another Rs 900,000. Total value: Rs 1,010,000.
4. July 1: The market dips slightly, say -5%.

The Result? Your total money is now Rs 959,500. You put in Rs 1,000,000. You are down Rs 40,500 (-4.05%). But the stock itself is actually UP.

1. The Asset Performance (TWR)

If you look at the stock’s journey (+10% then -5%), the "Time-Weighted Return" is actually +4.5%.

• The Lesson: The stock was a good pick. The strategy worked.
• Use TWR when: You want to know if your stock-picking or fund manager is actually good.

2. Your Personal Timing (MWR)

Because you added the bulk of your money after the rally, your "Money-Weighted Return" is -7.2%.

• The Lesson: Your timing killed your gains. You exposed more capital to the -5% drop than you did to the +10% gain.
• Use MWR when: You want to judge your own behavior and cash-flow timing.

3. The Benchmark Comparison (XIRR)

If you want to compare this to a bank FD or inflation, you need an annualized number. In this example, your XIRR is roughly -14%.

• The Lesson: This is your "Personal Inflation Rate." It’s the only number that tells you how you’re doing compared to "doing nothing" (like keeping money in a savings account or low risk money market mutual fund).

>Note: This example only has two cashflows and two price movements - so the math feels manageable numbers look straightforward and pure common sense. But in reality, most investors are adding money monthly, withdrawing occasionally, and riding through years of unpredictable market swings. With 30+ cashflows across multiple funds and stocks, calculating MWR or XIRR by hand becomes nearly impossible - and eyeballing ROI only becomes dangerously misleading. This is exactly why understanding which metric to track, and having a structured way to do it, matters more than most people realize.

Why this matters:

If you only look at ROI (Total Gain/Loss), you might sell a perfectly good stock because "it’s losing money," when in reality, the stock is performing great - you just bought at the wrong time.

Conversely, you might think you're a "trading god" because your XIRR is 30%, but if the TWR of the index is 40%, you're actually underperforming the market and just got lucky with a large deposit timing.

TL;DR:

• TWR tells you if the investment is good.
• MWR tells you if your timing was good.
• XIRR tells you how it compares to a yearly bank rate.

If your numbers look "off," stop looking at simple ROI. It’s the least useful metric for a long-term investor.

What's next? In the next post of this series, I'll be diving deep into Simple ROI vs. MWR. Notice from the example above: your ROI was -4.05% (down Rs 40,500 on Rs 1,000,000) but your MWR was -7.2%. Both are supposed to measure your personal returns - so why are they different numbers? And which one should you actually trust? That's exactly what we'll unpack next.