Time-Weighted Return (TWR) is a performance calculation method that isolates investment returns from the impact of deposits and withdrawals. Unlike simple return calculations, TWR breaks your investment timeline into separate periods each time cash moves in or out, then links those sub-period returns together. This approach reveals your actual investment performance independent of your personal cash management decisions.
How It Works
The calculation divides your investment period into intervals based on cash flow dates. For each interval, TWR calculates the return using only the opening balance and investment gains or losses during that period. These individual returns are then compounded together to create the total return figure. The key advantage: whether you added $10,000 at the market peak or trough doesn't distort the underlying performance metric.
Mathematically, TWR compounds the returns: (1 + R1) × (1 + R2) × (1 + R3) - 1, where each R represents a sub-period return. This approach works whether you have one cash flow or fifty.
Why It Matters for Investors
Time-Weighted Return is the gold standard for evaluating portfolio managers and fund performance. When you're deciding whether to back a fund manager or comparing two angel syndication platforms, TWR tells you which one actually generated better returns on the capital deployed—not which one benefited from lucky timing of investor deposits.
For angel investors specifically, TWR helps you assess whether your portfolio manager is making smart investment decisions or simply riding market momentum. It's particularly valuable when evaluating fund performance across multiple vintage years and investor cohorts.
Example
Imagine you invest $100,000 at the start of Year 1, and by year-end your portfolio is worth $110,000 (10% return). You then deposit $50,000 at the start of Year 2. By year-end, your total portfolio value is $165,000. A simple calculation might credit the manager with a 65% two-year return, but that's misleading—the second deposit skewed the result. TWR correctly shows the manager generated 10% in Year 1 and 10% in Year 2 (assuming the additional $50,000 also grew 10%), for a true two-year return of approximately 21%.
Key Takeaways
- TWR removes cash flow timing bias from return calculations, showing true manager skill
- Essential for comparing fund managers and investment platforms objectively
- Calculated by breaking returns into periods separated by cash flows, then compounding them
- The industry standard metric for evaluating professional investment performance