VGLT vs. TLT: Comparing Cost Efficiency in Long-Term Treasury ETFs

For investors seeking exposure to long-dated U.S. Treasury bonds, the choice between the Vanguard Long-Term Treasury ETF (VGLT) and the iShares 20+ Year Treasury Bond ETF (TLT) often comes down to cost efficiency and interest rate sensitivity. While both funds serve as effective hedges against equity market volatility and provide similar dividend yields of approximately 4.6%, their underlying structures differ in ways that can influence long-term performance.

The most significant differentiator is the expense ratio. VGLT maintains a lean expense ratio of 0.03%, which is five times lower than TLT’s 0.15%. In the context of fixed-income investing, where total returns are generally more modest than those of the equity markets, this cost advantage allows VGLT to retain a larger portion of its generated income for shareholders. Over the trailing 12-month period, VGLT has outperformed TLT, reflecting the impact of these lower fees and slightly different maturity profiles.

Beyond costs, the funds vary in their sensitivity to interest rate fluctuations. TLT focuses exclusively on bonds with maturities exceeding 20 years, resulting in a higher average duration of 15.9 years. Conversely, VGLT tracks a broader index of Treasuries with maturities of 10 years or more, leading to a lower average duration of 13.8 years. This makes TLT more volatile in response to interest rate shifts, as evidenced by its slightly higher five-year maximum drawdown compared to VGLT.

Ultimately, the decision between these two ETFs depends on an investor's specific objectives. TLT remains a highly liquid, pure-play instrument for those specifically targeting the longest end of the yield curve. However, for cost-conscious investors prioritizing long-term capital preservation and fee efficiency, VGLT offers a compelling, lower-cost alternative that provides comparable income with slightly reduced interest rate risk.