TLT vs SGOV comes down to one trade: yield versus duration. After the Fed’s hawkish September 16, 2026 hike to 3.75%–4%, the iShares 20+ Year Treasury Bond ETF (TLT) pays a 5.23% 30-day SEC yield but carries 15.02 years of duration. SGOV pays 3.65% with 0.10 years. TLT wins on income; SGOV wins on safety. With 16 of 19 Fed officials projecting another hike, duration is the risk that matters.
Both funds hold nothing but U.S. Treasuries. Both come from iShares. Yet they are almost opposite instruments. One is a long-duration interest-rate bet; the other is a cash substitute. The gap between them has rarely mattered more than it does after last week’s rate decision.
What changed for bond ETFs after the Fed’s September hike?
On September 16, 2026, the FOMC raised its target range to 3.75%–4% in a unanimous 12–0 vote, with Chair Kevin Warsh saying “inflation is too high and has been for too long,” according to Schwab’s meeting recap. This was a hike, not a cut — the opposite of what most investors penciled in a year ago.
Long yields moved with it. Per Wolf Street’s September 19 curve snapshot, the 30-year Treasury closed at 5.34% on September 18, its highest since 2007, while the 10-year held at 5.01%. The 2-year sat at 4.76% and the 3-year at 4.86%.
That reshapes the TLT vs SGOV decision. The curve now has a “bulge” where long rates sit above short rates — so the long fund actually out-yields the cash fund. The question is whether that extra income pays you enough to carry the duration.
TLT vs SGOV: what are you actually buying?
TLT holds Treasuries maturing in 20 years or more; SGOV holds bills maturing in zero to three months. That single design choice drives every number below: fee, yield, size, and above all duration — the measure of how much price moves when rates move. All figures are from each fund’s iShares page, dated September 17–18, 2026.
| Metric (as of Sep 17–18, 2026) | TLT | SGOV |
|---|---|---|
| Fund | iShares 20+ Year Treasury Bond ETF | iShares 0–3 Month Treasury Bond ETF |
| Expense ratio | 0.15% | 0.09% |
| 30-day SEC yield | 5.23% | 3.65% |
| Average yield to maturity | 5.39% | 3.91% |
| Effective duration | 15.02 yrs | 0.10 yrs |
| Net assets (AUM) | ~$46.7B | ~$110.9B |
| What it is | Long-duration rate bet | Cash substitute |
Note the size gap. SGOV’s roughly $110.9 billion in net assets is more than double TLT’s $46.7 billion, per iShares as of September 18 — a sign investors have crowded into safety rather than reaching for long-bond yield.
Which yields more right now, TLT or SGOV?
TLT yields more today. Its 30-day SEC yield is 5.23% versus SGOV’s 3.65%, a gap of 1.58 percentage points, per iShares data dated September 17, 2026. That is unusual: for most of the past three years, short cash out-yielded long bonds. The September hike and the steep long end flipped it.
But the yields answer different questions. SGOV’s 3.65% is close to locked in for the next few weeks because its bills mature almost immediately and reset at prevailing rates. TLT’s 5.23% is the coupon income you collect — it says nothing about what happens to the fund’s price if long rates keep climbing.
And they move in opposite directions on a pivot. If the Fed eventually cuts, SGOV’s yield falls fast (reinvestment risk), while TLT’s price would rise. If the Fed hikes again — which 16 of 19 officials projected at the September meeting, per Schwab — TLT’s price falls and SGOV simply rolls into higher-yielding bills.
How much does TLT’s duration risk cost you?
A lot — roughly 150 times what SGOV risks. Duration estimates the price change for a one-percentage-point move in rates. TLT’s 15.02-year duration means a 1-point rise knocks about 15% off the price; SGOV’s 0.10-year duration means about 0.10%. Here is the math on a $10,000 position in each, using the September 18 iShares figures.
- Annual income: TLT at 5.23% pays about $523; SGOV at 3.65% pays about $365. TLT’s income edge is roughly $158 a year.
- Annual fee: TLT at 0.15% costs $15; SGOV at 0.09% costs $9. A $6 difference — trivial next to the duration gap.
- Price hit if long rates rise 1 point: TLT drops about 15.02%, or −$1,502. SGOV drops about 0.10%, or −$10.
- Price gain if long rates fall 1 point: TLT rises about +$1,502; SGOV rises about +$10.
The punchline: a single one-point rise in long-term rates would cost a TLT holder about $1,502 — wiping out roughly 9.5 years of the $158 annual yield advantage ($1,502 ÷ $158 ≈ 9.5). SGOV’s holder would lose about $10 over the same move. That is the price of the extra 1.58 points of yield.
Is TLT’s 5.23% yield a trap?
It can be. A headline 5.23% yield looks generous, but it is only the income leg of the return. Total return is income plus price change — and with the 30-year at a 2007-high 5.34% on September 18 and most Fed officials guiding to another hike, the price leg is where the money is won or lost.
Here is the skeptical read: investors have chased TLT’s “high yield” through the entire rate-hiking cycle and repeatedly sat on paper losses as long rates ground higher. Buying a 15-year-duration fund because it yields 1.6 points more than cash, in the same week the Fed says it is not done, is a rate call dressed up as an income trade. If you are wrong on the path of rates, the coupon will not save you.
SGOV is not free of criticism either. Its yield is only as good as the next few weeks of bills; the day the Fed pivots to cuts, that 3.65% starts shrinking, and you give up the price rally TLT would capture. Neither fund is “safe” in every scenario — they are safe against different risks.
TLT vs SGOV: which is right for you?
It depends on one thing: your view on where long rates go next, and how long you can hold. If you need the money soon or cannot stomach a double-digit drawdown, the duration in TLT is a liability. If you want to lock in 5%-plus for decades and think rates have peaked, TLT is the tool built for that bet.
| Investor goal | Better fit | Why |
|---|---|---|
| Emergency fund / parking cash | SGOV | 0.10-yr duration; ~$10 risk per 1-pt move on $10K |
| Maximum principal stability | SGOV | Bills mature in weeks; price barely moves |
| Lock in 5%+ income for decades | TLT | 5.39% yield to maturity on long Treasuries |
| Bet the Fed pivots to cuts | TLT | +$1,502 per 1-pt rate drop on $10K |
| Worried short yields will fall | TLT | Locks a long coupon; SGOV resets lower on cuts |
| Can’t tolerate drawdowns | SGOV | Avoids 15 years of interest-rate risk |
Many investors hold both: SGOV as the stable cash sleeve, TLT as a smaller, deliberate rate bet they size for the volatility. The mistake is treating them as interchangeable “Treasury ETFs” because they share an issuer and an asset class. On risk, they could hardly be more different.
Frequently asked questions
Is SGOV safer than TLT?
On price risk, yes. SGOV’s effective duration is 0.10 years versus TLT’s 15.02 years, per iShares as of September 18, 2026. A one-point rate move barely touches SGOV but swings TLT by roughly 15%. Both carry the same U.S. Treasury credit backing.
Why does TLT yield more than SGOV right now?
Because the long end of the curve sits above the short end after the September hike. The 30-year was 5.34% on September 18 while short bills reset near the 3.75%–4% funds rate. That gives TLT a 5.23% SEC yield versus SGOV’s 3.65%.
What happens to TLT if the Fed hikes again?
If long rates rise with the hike, TLT’s price falls roughly 15% for each additional point. Sixteen of 19 FOMC officials projected at least one more hike before year-end 2026, per Schwab, which is the core risk to long duration here.
Does SGOV ever lose value?
Its price is nearly flat; the main risk is that income falls. When the Fed cuts, SGOV’s yield drops within weeks as maturing bills reinvest at lower rates. You keep your principal but earn less — the trade-off for near-zero duration.
Which has lower fees, TLT or SGOV?
SGOV, at a 0.09% expense ratio versus TLT’s 0.15%, per iShares. On $10,000 that is $9 a year versus $15 — a $6 gap that is immaterial next to the funds’ difference in interest-rate risk.
Can I hold both TLT and SGOV?
Yes, and many do. SGOV works as a cash-like anchor while TLT serves as a sized, intentional bet on falling long rates. Holding both lets you separate your cash needs from your interest-rate view instead of blending them.
Is TLT worth buying at a 5.23% yield?
That is a call on the path of long-term rates, not a straightforward income decision. The 5.23% only helps if TLT’s price holds or rises; if long yields keep climbing, price losses can dwarf the coupon. This is analysis, not a recommendation.
The bottom line
TLT vs SGOV is not really a yield contest — it is a duration decision. TLT pays 1.58 points more (5.23% vs 3.65%), but you buy 15.02 years of interest-rate risk to get it, and a single one-point rise in long rates would cost about $1,502 on a $10,000 stake versus $10 in SGOV.
So the winner depends on exactly one variable: whether you think the Fed is done. With 16 of 19 officials still guiding to more hikes and the 30-year at a 2007 high, SGOV is the lower-risk hold for cash you may need. TLT is the vehicle for investors who want to lock a long coupon and are willing to bet, with money, that rates have peaked. Pick the fund that matches your rate view — and size the duration to the loss you could actually sit through.
For related reading, see our breakdowns of T-bills vs money market funds, TIPS vs Treasuries at 5%, and XLF vs KRE after the Fed’s hike.
This article is journalism, not investment advice. Do your own research before investing.
Sources
- iShares 20+ Year Treasury Bond ETF (TLT) — fund page, data as of Sep 17–18, 2026
- iShares 0–3 Month Treasury Bond ETF (SGOV) — fund page, data as of Sep 17–18, 2026
- Charles Schwab — September 2026 FOMC meeting recap
- Wolf Street — Treasury yield curve snapshot, Sep 19, 2026
- Federal Reserve H.15 — Selected Interest Rates (Daily)