Duration
Definition
Duration is a measure of a bond's sensitivity to changes in interest rates. Expressed in years, it estimates how much a bond's price will change in response to a 1% move in interest rates. For example, a bond with a duration of 5 years will lose approximately 5% of its value if interest rates rise by 1%.
There are two common types of duration:
Why It Matters to Investors
- Key measure of interest rate risk in fixed income investing
- Helps investors compare risk across bonds with different maturities and coupon structures
- Longer-duration bonds are more volatile when interest rates move
- Crucial for portfolio construction and managing drawdown risk in bond allocations
- Affects the performance of bond ETFs like TLT (long duration) vs. SHY (short duration)
The TiltFolio View
Duration is central to how bonds behave in different macro regimes. TiltFolio Adaptive considers the interest rate environment and market signals when rotating into or out of bonds, especially long-duration instruments like U.S. Treasury ETFs. TiltFolio Balanced maintains exposure to both intermediate-term (IEF) and long-term (TLT) Treasury bonds as part of its diversified allocation.
In recessions or deflationary shocks, falling rates tend to boost long-duration bond prices, offering a powerful hedge against equity drawdowns. Conversely, in inflationary or tightening cycles, long-duration bonds suffer. TiltFolio Adaptive reduces exposure or rotates to other asset classes entirely, while TiltFolio Balanced relies on diversification to manage duration risk.
By recognizing the regime-dependent nature of duration, TiltFolio Adaptive avoids the mistake of holding long bonds in rising-rate environments and seeks to capture their upside when conditions turn favorable.
Real-World Application
• An investor buys a bond ETF with a 20-year duration, expecting rates to fall
• A portfolio manager shifts from long-duration bonds to short-duration notes as inflation rises
• A retiree builds a bond ladder with varied durations to manage income and reinvestment risk
• A trend-following model exits long bonds as yields break higher, reducing portfolio volatility