Time-Weighted Return
Quick Definition
A return calculation that eliminates the impact of cash flows to measure pure investment performance, independent of investor timing.
What Is Time-Weighted Return?
Time-Weighted Return (TWR)
Time-weighted return measures the compound growth rate of a portfolio while eliminating the distorting effects of cash flows (deposits and withdrawals). It isolates the performance of the investment strategy itself, regardless of when an investor added or removed money.
How Time-Weighted Return Works
The TWR breaks the total period into sub-periods defined by each cash flow event, calculates the return for each sub-period, then geometrically links them together.
Step-by-Step Calculation
Portfolio with a mid-year deposit:
| Period | Start Value | Cash Flow | End Value | Sub-Period Return |
|---|---|---|---|---|
| Jan-Jun | $100,000 | — | $110,000 | +10.0% |
| Jul 1 | $110,000 | +$50,000 = $160,000 | — | (deposit) |
| Jul-Dec | $160,000 | — | $168,000 | +5.0% |
Time-Weighted Return = (1 + 0.10) x (1 + 0.05) - 1 = 15.5%
This result is the same regardless of whether the investor deposited $50,000 or $500,000 in July. The TWR measures only the investment performance, not the investor's behavior.
Why TWR Is the Industry Standard
| Use Case | Preferred Metric | Reason |
|---|---|---|
| Evaluating fund managers | Time-Weighted | Manager doesn't control client deposits |
| Comparing mutual funds | Time-Weighted | Apples-to-apples comparison |
| Your personal results | Dollar-Weighted | Captures your actual experience |
| Regulatory reporting | Time-Weighted | GIPS compliance requires TWR |
TWR vs Dollar-Weighted: Key Difference
Same fund, two investors, different results:
Fund TWR: +12% for the year
- Investor A (invested at start): Dollar-weighted = +12% (matches TWR)
- Investor B (invested 90% of money in final month): Dollar-weighted = +1.1% (barely captured the gains)
The TWR is identical for both because it measures the fund, not the investor.
Real-World Application
The Global Investment Performance Standards (GIPS) require investment firms to report time-weighted returns. When you see a mutual fund's "annual return," it's always time-weighted, enabling you to compare any two funds regardless of their cash flow patterns.
Why It Matters
Time-weighted return is essential for fairly evaluating investment managers and strategies. Without removing cash flow effects, a fund manager who received huge inflows just before a downturn would appear to perform poorly — even if their investment decisions were excellent. TWR separates manager skill from investor timing.
Formula
Formula
TWR = [(1 + R₁) x (1 + R₂) x ... x (1 + Rₙ)] - 1, where R = sub-period return between cash flowsTime-Weighted Return Example
- 1A mutual fund reports a time-weighted return of 11.4% for the year, allowing investors to compare it against the S&P 500 benchmark.
- 2Despite large redemptions during a downturn, the hedge fund's time-weighted return of 8.3% proved the manager's skill was unaffected by client withdrawals.
Related Terms
Dollar-Weighted Return
A return calculation that accounts for the timing and size of cash flows, reflecting the actual return experienced by the investor.
Benchmark Index
A standard index used to measure and compare the performance of a portfolio or investment manager over time.
Alpha Generation
The process of creating investment returns that exceed a benchmark index, attributable to manager skill rather than market exposure.
Active vs. Passive Investing
The debate between actively managed funds seeking to beat the market versus passive index funds that aim to match market returns at lower cost.
Turnover Rate
The percentage of a portfolio's holdings that are replaced during a given period, indicating how actively the portfolio is traded.
Asset Allocation
The process of dividing investments among different asset classes like stocks, bonds, and cash to balance risk and reward.
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