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A rising account balance doesn't mean you earned that return. Learn how to measure what you truly earned, compare it fairly, and see the real result.
When a fund reports a 10% return, that number assumes one thing: that you invested a lump sum at the start of the year and never touched it. Real investors don't work that way. They add money every month, take money out, and reinvest dividends. Every one of those moves changes what you personally earned.
That's why two people can own the same fund over the same period and end up with different returns. Measuring your own performance correctly means accounting for when your money went in and out, not just looking at how much your balance has grown.
| Measure | What It Captures | Best Used For |
|---|---|---|
| Simple ROI or CAGR | Total or yearly growth of one starting amount | A lump sum with no deposits or withdrawals |
| Money-weighted return (IRR or XIRR) | Your personal return, including the timing and size of your deposits and withdrawals | Understanding what you actually earned |
| Time-weighted return | The performance of the investments themselves, with the effect of your deposits and withdrawals removed | Comparing a fund or manager against a benchmark |
The first is the ROI and CAGR you learned earlier in this course. The second and third are the tools you need once money moves in and out. Many brokerages and retirement plans report a "personal rate of return," which is typically a money-weighted measure.
Say Dan starts the year with $50,000 in his account. During the year he adds $3,000 in deposits, and by year-end the balance is $56,000. It's tempting to say he earned 12%, since $56,000 is 12% more than $50,000. But $3,000 of that increase came from his own pocket.
| Step | Calculation | Result |
|---|---|---|
| Naive view | ($56,000 − $50,000) ÷ $50,000 | 12.0% (overstated) |
| Actual investment gain | $56,000 − $50,000 − $3,000 deposits | $3,000 |
| Quick estimate of the return | $3,000 ÷ ($50,000 + $3,000 × 0.5) | About 5.8% |
The quick estimate divides the gain by the average amount invested during the year, assuming the deposits arrived about halfway through. It's an approximation, but it's far closer to the truth than 12%. You can test simple cases with our Stock ROI Calculator.
Now say Riya invests $10,000 in a fund at the start of year one. The fund gains 10%, so her balance grows to $11,000. Feeling confident, she adds another $10,000, bringing her balance to $21,000. In year two the fund falls 10%, and her balance drops to $18,900.
| Measure | Result | What It Tells You |
|---|---|---|
| The fund's time-weighted return | About −0.5% a year (+10% then −10%, or −1% in total) | How the fund itself performed |
| Riya's money-weighted return (IRR) | About −3.7% a year | What Riya actually earned, given when she invested |
| Riya's dollars | Put in $20,000, ended with $18,900, a loss of $1,100 | The plain result of her decisions |
These are simple illustrations, not predictions or guarantees. The fund barely lost anything over two years, yet Riya lost about $1,100, because most of her money was invested during the down year. Her return was worse than the fund's because of when she added money. The reverse can also happen: adding money before a strong period makes your personal return higher than the fund's.
Neither number is "wrong." The time-weighted return tells you how good the investment was, and the money-weighted return tells you how the investor did. It's useful to look at both.
You don't need special software. Excel and Google Sheets have a function called XIRR that calculates a money-weighted return from dated cash flows.
| Step | What to Do |
|---|---|
| 1. List your dates | Put each date you added or withdrew money in one column, plus today's date |
| 2. List your cash flows | In the next column, enter deposits as negative numbers and withdrawals as positive numbers |
| 3. Add the current value | On today's date, enter your account's current balance as a positive number |
| 4. Apply the formula | Use =XIRR(values, dates) to get your annualized personal return |
Deposits are negative because, from the investment's point of view, that's money you handed over. The final balance is positive because it's what you'd get back if you cashed out. If your account only has a few large deposits, you can also use our CAGR Calculator for a rough check on each holding, but XIRR handles multiple deposits correctly.
A benchmark is a yardstick for comparison. Knowing you earned 8% means little unless you know what a comparable, low-cost alternative earned over the same period. The key word is comparable.
| What You Own | A Sensible Benchmark |
|---|---|
| Mostly US large-company stocks | An S&P 500 index fund, using the total return version that includes dividends |
| A broad US stock portfolio | A total US stock market index |
| A mix of stocks and bonds, such as 60/40 | A blend of a stock index and a bond index in the same proportions |
| A global portfolio | A global stock index, or a blend that matches your allocation |
Comparing a balanced portfolio to the S&P 500 on its own would be unfair. A portfolio that holds bonds should lag stocks in a strong year, and it should fall less in a weak one, as we saw in our lesson on volatility and drawdowns. For long-run context on what the stock benchmark has delivered, see our lesson on S&P 500 historical returns.
The return you calculate from account balances is usually a nominal return. To see the number that really matters, adjust it for the things that reduce it.
| Step (Dan's example) | Rate |
|---|---|
| Estimated personal return | About 5.8% |
| Less taxes and account-level fees, if they aren't already included | Reduces the result; the amount depends on your accounts |
| After 3% inflation (real return) | About 2.7%, before any tax or fee adjustment |
Fund returns are generally reported after the fund's own expense ratio, but advisory fees and your own taxes usually aren't included, so check how your provider calculates the figure. Our lessons on fees and taxes and nominal vs real returns explain each adjustment, and our Inflation Calculator can help with the last step.
| Source | What You'll Find |
|---|---|
| Your brokerage's performance page | Balance history, deposits, dividends, and often a personal rate of return |
| Your 401(k) or IRA statement | Contributions, growth, and sometimes a personal rate of return for the period |
| Fund fact sheets | The fund's time-weighted returns over 1, 5, and 10 years, plus its expense ratio |
| Form 1099 from your brokerage | Dividends, interest, and realized gains for tax purposes |
If a provider shows a return, look for how it's defined: whether it's annualized, whether it includes dividends, and whether it's before or after fees. Two numbers labeled "return" can be measuring very different things.
A single year is mostly noise. As we saw in the historical data, one-year stock returns have ranged from a loss of more than 40% to a gain of more than 50%, so one good or bad year says very little about your strategy. A more useful view uses at least three to five years, and ideally a full market cycle that includes both good and bad stretches.
It also helps to compare over the same start and end dates. Comparing your return from March to a benchmark's return from January can give a misleading picture.
| Question | Why It Matters |
|---|---|
| What did I actually earn, using dated cash flows? | Gives you your true personal return, not the naive balance change |
| How does it compare to a fair benchmark over the same period? | Shows whether your choices added value or cost you |
| What was my worst decline, and how did I react? | Reveals whether your portfolio suits your comfort level |
| How much am I paying in fees and taxes? | These reduce your return every year |
| Is my return enough to reach my goal after inflation? | Connects the numbers to what you're actually trying to achieve |
If you're saving for retirement, try running your own numbers in our 401(k) Projector using the real return you've calculated.
| Tool | The Question It Answers |
|---|---|
| Real return | Is my buying power actually growing? |
| ROI | How much did I gain or lose in total? |
| CAGR | What steady yearly rate does that equal? |
| Compounding and total return | How do time, interest, and dividends build the result? |
| Fees and taxes | How much of the return do I actually keep? |
| Benchmarks and drawdowns | Is this result reasonable, and can I live with the ride? |
| XIRR and time-weighted return | What did I personally earn, and how did the investments perform? |
No single number tells the whole story. Used together, these give you a clear, honest picture of how your money is really doing.
1. Counting your deposits as gains. If you added money during the year, the growth in your balance is not all return. Subtract your contributions before judging performance.
2. Comparing to the wrong benchmark. A portfolio with bonds shouldn't be judged against a 100% stock index, and a price-only index shouldn't be compared with a return that includes dividends.
3. Using a lump-sum formula when you've made regular deposits. Simple ROI and CAGR assume a single starting amount. For regular contributions, use a money-weighted measure such as XIRR.
4. Judging performance over too short a period. One year can be dominated by luck or a market swing. Look at multi-year results over the same dates as your benchmark.
5. Stopping at the headline number. A return before fees, taxes, and inflation overstates what you earned. Adjust it to see your real result.
Key Takeaway: To measure your real performance, account for the timing of your deposits and withdrawals, compare against a fair benchmark over the same period, and adjust the result for fees, taxes, and inflation, because the number on your statement rarely tells the whole story.
There isn't one number. A better question is whether your return is reasonable compared with a fair benchmark for the same mix of investments, and whether it's enough, after inflation, to reach your goals.
CAGR assumes one starting amount and one ending value. XIRR uses the dates and sizes of every deposit and withdrawal, so it is the better choice when you've added money over time.
It measures how the investments performed while removing the effect of when you added or withdrew money. Funds and managers usually report it, which makes it useful for comparing them against benchmarks.
A full review once or twice a year is enough for most long-term investors. Checking more often tends to put too much weight on short-term swings, which can encourage emotional decisions.
Only if your portfolio is mostly US large-company stocks. If you hold bonds, international stocks, or other assets, a blended benchmark that matches your allocation is a fairer comparison.
It varies. Fund returns are generally shown after the fund's expense ratio, but advisory fees and your own taxes often aren't included. Check the provider's explanation of how it calculates returns.
Disclaimer: This article is for general educational purposes only and does not constitute personalized financial, investment, tax, or legal advice. Figures, rates, and rules mentioned may change over time — verify current details with an official source or a qualified professional before making financial decisions.