The US 10-Year Treasury Yield Is the 'Risk-Free' Bar Every Market Prices Against. IHSG Included
6 min read
Loading...
6 min read
On 1 September 2026, IHSG closed up 1.14%, at 6,599.94. A good day, on the surface driven by Indonesian bank and industrial stocks. But zoom out from that single day, and a number that has nothing to do with any Indonesian company, Bank Indonesia decision or IDX earnings season has been quietly setting the mood for global investors all year: the US 10-year Treasury yield. It has climbed from 4.19% in early January to nearly 4.80% now, its highest level since January 2025, and every asset you hold, from an IDX blue chip to a government bond, gets priced against it whether you notice or not.
The US 10-year Treasury yield is the annual return the United States government promises to pay for borrowing money from investors for ten years. Investors call it the risk-free rate, not because it never moves, but because the odds the US government fails to repay it are treated by nearly every bank, fund manager and pricing model on earth as close to zero, and the market for it is the largest, most liquid bond market that exists.
That matters beyond the US, because almost every other investment in the world gets judged partly by how much extra return it offers on top of this floor. An IDX stock, an Indonesian government bond, a corporate bond: each has to compensate an investor for taking on risk the US Treasury doesn't carry. That extra compensation is called a risk premium. When the risk-free floor itself rises, the bar every riskier asset has to clear rises with it.
It is easy to conflate this with the Federal Reserve's policy rate, but they are set differently. The Fed's rate-setting committee fixes a single overnight rate, the federal funds rate, at scheduled meetings. The 10-year yield, by contrast, is set continuously by bond traders buying and selling every day, pricing in where they expect growth, inflation and the Fed's own path to be over the next decade, not just where the Fed rate sits today. NetWort's earlier piece on why the Fed rate still moves USD/IDR covers the policy-rate side of this relationship; the 10-year yield is the other half, and the two do not always move together.
Right now they are moving in the same direction, and a single event shows why. On 28 August 2026, Fed Chair Kevin Warsh gave an unexpectedly hawkish speech at the Jackson Hole conference, reaffirming the Fed's 2% inflation target as "firm and fixed" and signaling more concern about inflation than after the July meeting. Fed funds futures immediately repriced: the odds of a September rate hike jumped to 60.4%, from around 56% before the speech, according to CME's FedWatch tool as reported by CNBC on 31 August 2026. That is a shift toward higher rates, not lower ones. Bond traders, already pricing in sticky inflation and rising oil prices, pushed the 10-year yield further, to just under 4.80% by 1 September, per Trading Economics' tracked market data.
Picture a global fund manager choosing where to park money. They can hold the safest, most liquid asset on earth and earn close to 4.80% a year with essentially no default risk. Or they can hold an Indonesian government bond, a Surat Berharga Negara (SBN), whose 10-year benchmark yielded around 7.04% as of 24 August 2026, according to Trading Economics, as covered in NetWort's piece on Indonesia's widening budget deficit.
| Yield (approx.) | |
|---|---|
| US 10-year Treasury | 4.80% (1 Sept 2026) |
| Indonesia 10-year SBN | 7.04% (24 Aug 2026) |
| Spread | ~2.24 percentage points (224 basis points) |
A basis point is one-hundredth of a percent, so 224 basis points is the extra yield an investor currently demands to hold Indonesian government debt instead of the US risk-free asset. That gap has to compensate for currency risk, Indonesia's own fiscal picture and simple distance from the world's deepest bond market. When the US side of that gap rises, as it has all year, the gap only stays wide enough to keep foreign money interested if Indonesia's own yields rise too, or if the rupiah is expected to weaken enough to make up the difference. If neither happens fast enough, foreign holders sell.
That selling has shown up repeatedly through 2026, not as a single event but as a recurring pattern tied to yield moves. In late April 2026, as Treasury yields firmed, foreign investors net sold roughly Rp2.04 trillion on the IDX in a single session, concentrated in bank stocks BBCA, BMRI and BBRI, according to reporting at the time. Even in late August 2026, with Treasury yields briefly easing before Warsh's Jackson Hole reversal, equities still recorded roughly $43 million in net foreign outflows over one week, a sign that foreign investors had not fully returned even during the relief. Meanwhile the rupiah's own official reference rate, Bank Indonesia's JISDOR, closed at Rp17,727 per US dollar on 1 September 2026, still near the weaker end of its 2026 range.
The absolute level of the 10-year yield matters less than its direction and the speed of the move. A slow grind from 4.19% to 4.80% over eight months is a very different signal than the same move happening in eight days. The US dollar index, a basket measure of the dollar's strength against major currencies, has been telling a similar story: it traded near 99.4 in the same week the Treasury yield climbed, consistent with capital gravitating toward dollar assets rather than away from them.
NetWort's Macro Context page tracks the US Treasury benchmark yield alongside Bank Indonesia's own rate, USD/IDR and inflation, so you can watch how they move relative to each other instead of reading US and Indonesian headlines as if they were unrelated stories. Checking it against IHSG's own daily move on the Market page is a better habit than reacting to any single day's number in isolation.