TLT vs IEF vs SGOV: Treasury ETF duration comparison
These funds occupy very different points on the Treasury maturity curve and should not share one generic bond allocation label.
These funds occupy very different points on the Treasury maturity curve and should not share one generic bond allocation label.
| Fund | Exposure or role | Important distinction |
|---|---|---|
| TLT | long-duration U.S. Treasury exposure | large interest-rate sensitivity makes it unsuitable as a cash substitute |
| IEF | 7-10 year U.S. Treasury exposure | intermediate duration changes volatility and yield sensitivity |
| SGOV | 0-3 month U.S. Treasury exposure | very short maturity creates a different portfolio job from TLT or IEF |
TLT, IEF and SGOV should be compared only after the intended job is written down. Decide whether the position is meant to provide broad market exposure, a style or sector tilt, income, duration management or a trading vehicle. A higher recent return or distribution does not establish a better match for that job.
Read each objective and benchmark rule before looking at performance. Record the eligible universe, weighting method, concentration caps, reconstitution schedule and whether the portfolio uses full replication, sampling, options or derivatives. Two funds can share many holdings while assigning them very different weights.
Start with the current stated expense ratio, then examine bid-ask spread, premium-discount history and the tax cost of replacing an existing holding. Option, derivative, financing or securities-lending arrangements can also influence the result. A small published fee gap may not repay an immediate realized gain or a poor execution.
Use matching dates and total returns with the same distribution treatment. Examine concentration, drawdown, recovery time and performance during a period that challenged the strategy. Do not compare a price-only series with a reinvested total-return series or treat a short favorable window as proof of a permanent advantage.
Fees, holdings, distributions and portfolio characteristics can change. Verify each current issuer page and prospectus on the day of the decision.
Read the current prospectus and issuer page for the specific fund before relying on a fee, objective, holding or risk statement.
These funds occupy very different points on the Treasury maturity curve and should not share one generic bond allocation label. Begin by writing the portfolio job in one sentence. Then compare maturity range, effective duration and the way the portfolio responds to a change in yields. This prevents a familiar ticker, a recent return or a small fee difference from deciding the question before the products have been defined.
Open each objective and benchmark description. Record the eligible universe, weighting rules, reconstitution schedule and any concentration controls. If one fund uses derivatives, options, sampling or a different legal structure, name that difference explicitly. A comparison is weak when it assumes that similar historical charts prove the portfolios are interchangeable.
Convert each stated expense ratio into dollars for the proposed position, but do not stop there. Add the bid-ask spread, expected trading frequency, premium or discount risk, and any immediate tax cost from replacing an existing holding. For shorter periods, execution can outweigh a small annual fee gap. For longer periods, benchmark design and compounding can matter more.
Compare the largest positions and their combined weight, then examine sector, country, maturity or strategy exposures that drive the result. Note whether the funds overlap with holdings already in the portfolio. A new ticker does not create diversification if it repackages the same companies or the same economic risk.
A rate move can produce a price change even when credit risk is low. A useful check is to compare a parallel yield shift with a curve-steepening or curve-flattening scenario. Apply the same dates, return definition and distribution treatment to every fund. Include the possibility that spreads widen and that an order cannot be filled at the last displayed price.
Use TreasuryDirect descriptions, the fund prospectus, holdings and duration statistics. Save the document date and the exact section supporting the deciding fact. If the current source contradicts an old comparison, the current source controls. If the difference cannot be resolved, keep the uncertainty visible rather than filling it with an estimate.
No single winner applies to every account. The useful conclusion states which fund fits a defined job under stated assumptions and which facts must remain true for that choice to continue making sense.