Lending your money for a long time has always had a price: the extra yield you demand for tying up your stake for ten or thirty years, in compensation for everything that can go wrong before maturity. Economists call it the "term premium". For a decade, central banks erased it through massive bond buying, until it turned negative. Now it is reappearing. And with it, a shift: the discipline imposed on a spendthrift state no longer comes from the central bank, but from the market.
1 The forgotten toll
A price of time so long held at zero that we thought it gone.
The price of time
A toll the 2010s had abolished
When you lend to a state for thirty years rather than for three months, you give up your money for far longer: you normally demand, in exchange, an extra yield. That extra is a toll: the price of time and of uncertainty. Yet throughout the 2010s, this toll melted away until it became nil, even negative: lending long earned almost nothing more than lending short. Everyone had grown used to it, to the point of forgetting that the toll existed at all. Its return, since 2024, is one of the major financial facts of the era.
2 Anatomy of a premium
An essential quantity, yet one that no one can observe.
The breakdown
Expectations plus premium
The yield on a long bond breaks down into two pieces. First, the average of the short-term rates the market expects over the whole life of the loan: if you lend for ten years, it is the picture you form of short rates over ten years. Then, the "term premium": the surplus demanded on top of that expectation, for the risk of being wrong. The catch: this premium cannot be observed directly. You see the total yield, you estimate expectations, and you infer the premium by difference, using models (the best known being that of the Federal Reserve Bank of New York). As a PIMCO manager sums it up, the term premium is "important to understand, but impossible to observe". It is a thermometer, not a raw fact: worth keeping in mind.
3 When the toll was abolished
How central banks crushed the premium, all the way into negative territory.
The effect of QE
Buying the debt to silence the toll
After 2008, to support the economy, central banks bought mountains of long bonds: this is "quantitative easing" (QE). By taking a large share of the risk of holding long debt off the market, they compressed the term premium: investors, relieved of that risk, demanded less in exchange. The premium thus fell to zero, then below it: around −0.84% in 2016, and a record trough near −1.3% in July 2020. For the first time, lending long could cost, in premium terms, less than nothing. The toll of time had, in effect, been abolished by monetary decision.
Term premium, 2016
≈ −0.8%
already negative in the heart of the QE decade.
Trough, July 2020
≈ −1.3%
the lowest level ever measured (New York Fed model).
4 The toll returns
The central bank withdraws, and the price of time reappears.
The reappearance
The demanded surplus resurfaces
Since 2023, central banks no longer prop up long-term rates: they are even shrinking their balance sheets ("quantitative tightening"), while states issue mountains of debt. The risk of holding long-dated paper therefore returns to investors, who once again demand a premium. It has turned distinctly positive again: in early 2025 it topped 0.8%, its highest since 2011, and the Federal Reserve Bank of St. Louis calculated that it accounted for "more than half" of the recent rise in ten-year rates. With a spectacular consequence: the yield on the US 30-year Treasury crossed 5%, reaching 5.2% in May 2026, its highest in nineteen years.
An unusual sign
The most striking part is the timing: long-term rates rose even as the Fed began cutting its short-term rates in late 2024. Ordinarily, when the central bank eases, long rates fall. Their rising against the current signals that something else is at work: no longer the anticipation of monetary policy, but the price the market puts, of its own accord, on the risk of lending long to heavily indebted states.
5 The whole world pays
The toll is reappearing not only in the United States.
A global phenomenon
Wherever debt worries, the long term grows dearer
The move is general. In the United Kingdom, the yield on the 30-year gilt reached its highest level since 1998. In Japan, long the kingdom of zero rates, the 40-year bond set records and the 30-year touched all-time highs. In France, political instability widened the spread between French and German debt to levels not seen since the eurozone crisis. And the rating agencies have acknowledged the loss of confidence: in May 2025, Moody's stripped the United States of its last "triple A", which it had held since 1917. Everywhere, lending long to a state again costs more.
UK 30-year gilt
1998
its highest yield since that date.
US sovereign rating
Aaa → Aa1
Moody's strips the last US AAA (May 2025).
6 Discipline changes hands
When the central bank falls silent, the market speaks.
The return of the "bond vigilantes"
Bond investors take up the stick again
As long as the central bank bought the debt at any price, the state could spend and borrow without the market flinching. By withdrawing, it hands the floor back to bond investors, who make fiscal laxity cost more: this is the return of the "bond vigilantes". The expression dates from 1983: the economist Ed Yardeni wrote then that "if the fiscal and monetary authorities won't regulate the economy, the bond investors will". Discipline no longer comes from above, through the central bank; it comes from the market, through the price.
James Carville's word
Bill Clinton's adviser, James Carville, captured this power in a quip that has stayed famous, in the mid-1990s: "I used to think that if there was reincarnation, I wanted to come back as... the bond market. You can intimidate everybody." The term premium is the instrument of that intimidation: it is through the premium that the market signals to a state that it is spending too much, and makes it pay the price without waiting for the verdict of the ballot box.
7 The Truss warning
The proof by example that the market can bring down a government.
September 2022
When the bond market toppled a prime minister
The most telling episode remains that of Liz Truss in the United Kingdom. On 23 September 2022, her government announced £45 billion of unfunded tax cuts, without independent costing. The market's reaction was devastating: the yield on the 30-year gilt jumped by about 150 basis points in four sessions, the pound collapsed, and pension funds nearly went bankrupt. The Bank of England had to step in urgently to buy debt and put out the fire. A few days later, Liz Truss resigned: in practice, the bond market had brought down a government in less than a month.
The lesson, learned everywhere
The Truss affair served as a warning to every government: there is a limit beyond which the bond market stops financing meekly and demands, brutally, a premium. That limit is neither voted nor announced; it is discovered, sometimes too late, when the toll of time reminds a state that thought it abolished.
8 The margin of uncertainty
Let us be rigorous: the term premium is as much a narrative as a measurement.
The caveats
What the premium does not say on its own
Three notes of caution are in order. First, the term premium is not observable: it depends on the model, and different models give different figures; its exact value is uncertain. Next, the rise in long-term rates does not reflect fiscal risk alone: it also stems from higher real rates and from uncertainty about inflation; in May 2026, some analysts even put inflation, rather than the deficit, at the head of the causes. Finally, the central bank can always step back in: the Truss episode showed it, a safety net can break market discipline in a matter of hours. The return of the "bond vigilantes" is real, but it truly constrains the state only so long as the central bank does not retake control.
A thermometer, not an oracle
One must therefore guard against certainties. The term premium is a valuable indicator of the price the market puts on long debt, but it is an estimated indicator, sensitive to the model and mixed with other forces. To say that "discipline has passed to the market" describes a real trend, not an iron law: the central bank remains, in the last resort, able to reopen the tap.
9 Time regains its price
It remains to be seen which will yield first, the state or the market.
The trial of strength
The toll had not disappeared: it was dormant
The toll of time had never been abolished; it had only been masked, for a decade, by central-bank buying. As central banks withdraw and debts swell, it reappears, and with it the trial of strength between states that want to keep spending and a market that makes them pay the price. The term premium is the dial on which this tension is read: every rise is a warning, every easing, a reprieve. Time, once again, has its price.
The compass
①
The term premium is the toll of time. The surplus demanded to lend long; long crushed by QE, all the way into negative territory.
②
Its return shifts the discipline. The central bank withdraws, the market takes up the stick: this is the return of the "bond vigilantes".
③
An uncertain measure. The premium is not observable, blends fiscal risk, real rates and inflation, and the central bank can retake control. This sheet sheds light on a debate; it does not offer investment advice.
Read alongside: When the saver repays the debt without knowing it, the "financial repression" side of the same debt problem. Reference: abbreviations & acronyms (QE, QT, bps, AAA).