TLT vs. IEF: How Much Treasury Rate Risk Should You Actually Take?

The choice between iShares 20+ Year Treasury Bond ETF (NASDAQ:TLT) and iShares 7-10 Year Treasury Bond ETF (NASDAQ:IEF) looks trivial on paper. Both hold only U.S. Treasuries, both charge 0.15%, and both pay monthly. Yet since the start of 2022, TLT has lost 31.16% while IEF has slipped just 5.53%. That gap comes down to duration, the only variable that matters here.

What Each Fund Is Actually Betting On

IEF holds the belly of the Treasury curve, roughly 7-8 years of effective duration. Its implicit bet is modest: capture more yield than cash without wagering heavily on the long end of the curve. TLT is a different animal. With effective duration near 16-17 years, it functions as a leveraged position on falling long-term rates. For every 1% move in yields, TLT moves roughly twice what IEF does.

That math cuts both ways. TLT needs falling long yields to pay off. IEF wins in a broader range of outcomes: it earns a decent coupon, benefits from mild rate declines, and does not get destroyed if the long end reprices higher.

Where the Difference Shows Up

The 2022 rate shock is the clearest case study. As the Fed hiked aggressively, TLT collapsed while IEF took a comparatively minor bruise. The five-year picture underscores it. TLT is down 31.7% over five years versus 7.13% for IEF. Over ten years, IEF eked out a 3.45% total price return while TLT lost 22.22%.

The reverse plays out in flight-to-quality panics. In 2020, TLT surged as investors piled into long duration. That asymmetry is the entire point of holding it: you take the pain in rising-rate regimes to own convex upside when the economy cracks.

The Curve Matters More Than You Think

Right now, the 10-year Treasury yields 4.56% while the 20-year sits at 5.07%. That extra 50 basis points of yield is what TLT holders are paid for accepting double the rate risk. The 2Y-10Y spread has compressed to 0.35%, in the 4th percentile of the past year. A flat curve reduces the yield reward for extending duration.

Distributions reflect the tradeoff. TLT paid $3.904215 per share over the trailing 12 months. IEF paid $3.674783. A modest income pickup for roughly double the volatility.

Side by Side

The Verdict

For most investors using Treasuries as portfolio ballast, IEF offers a more defensible risk profile. It delivers the vast majority of the income with a fraction of the rate risk, and its history through the 2022 shock proves the point. TLT belongs in a portfolio only when the investor is explicitly wagering on a sharp fall in long-end yields, whether from disinflation, recession, or a Fed pivot beyond what the curve currently prices. If the 10-year drifts toward 3% over the next 18 months, TLT will substantially outperform. If it drifts toward 5%, IEF holders will barely notice while TLT holders watch another leg down.

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