What Is Yield Curve Control?

When a house gets too hot, there are three sensible things to do: open a window, turn down the furnace, or go find out what’s on fire. There is also a fourth. You tape a block of dry ice to the thermometer, announce that the house is a comfortable 68 degrees, and promise to keep adding ice for as long as it takes.

Central banks have a name for the fourth one. It’s called yield curve control. A central bank picks an interest rate on government bonds, usually a longer-term one it doesn’t normally control, and promises to buy as many of those bonds as it takes to keep that rate from rising above its target. Because it can create the money to pay for them, people believe it, at least for a while.

The United States did it from 1942 to 1951. Japan did it from 2016 to 2024. Australia did it from 2020 to 2021. One exit took a fight over a press release, one took seven and a half years, and one took a single bad inflation report.

What is a bond yield, and why would anyone control it?

A bond is an IOU from the government: you hand over, say, $1,000, and you get interest and your $1,000 back later. The yield is your yearly return on the price you paid.

The one rule you need is this: bond prices and yields move in opposite directions, like the two ends of a playground seesaw. When lots of people sell, the price end drops and the yield end rises. When someone keeps buying, the price end stays up and the yield end stays down.

Yields matter because they set the cost of borrowing for almost everyone downstream: your mortgage, the corner store’s business loan and, biggest of all, the government itself. A government with a large debt has strong feelings about which end of the seesaw belongs on the ground. Under yield curve control, the central bank sits down on the yield end and refuses to get off. The yield stays low, the price stays up, and the other children are told this is temporary.

How does yield curve control work?

The beauty of it, from the central bank’s side, is that a promise people believe barely needs keeping. (“Attention, bond market: we will buy every bond you bring us at this price. Bring as many as you like. Please don’t.”) Why sell a bond to anyone else for less when the central bank will always pay more? So in the best case the bank hardly buys anything. The dry ice is mostly decorative.

The catch arrives when investors stop believing. If inflation is rising, they all head for the exit at once, and the bank has to buy every bond they sell to hold the line. There’s no natural limit to how many that is. The thermometer is now wearing an entire freezer, and someone is asking about the electric bill.

Quantitative easing, the cousin most people have heard of, works the other way around. With quantitative easing, a central bank says how many bonds it will buy and lets the price land where it lands. With yield curve control, it names the price and lets the quantity land where it lands. One promises an amount of dry ice. The other promises a temperature, which is a much bigger promise, since nobody knows in advance how hot the house is going to get.

Has the United States used yield curve control?

Yes, for nine years, to pay for a war, and the war ended six years before the policy did.

Picture April 1942. It’s been four months since Pearl Harbor. Victory gardens are going into backyards, there’s a war bond poster in every post office, and sugar is about to become the first food the country rations. That month the Federal Reserve committed to holding the rate on short-term Treasury bills at three-eighths of one percent, and to an implicit ceiling of 2.5% on long-term government bonds, according to the Fed’s own history. The point was to let the government borrow cheaply for the war. It did.

The war ended in 1945. The peg did not. With rationing lifted and a whole country wanting new cars and refrigerators at once, prices took off. The Consumer Price Index rose 17.6% between June 1946 and June 1947, and another 9.5% the year after. All the while, the long bond stayed capped at 2.5%.

Put those two numbers side by side, because they’re the whole story. A saver who bought a government bond in 1946 was promised 2.5% a year while prices rose 17.6% in a single year. Lend the government $1,000 in mid-1946, and a year later you had $1,025 that bought what about $872 had bought the summer before. Like lending your brother-in-law a whole pizza and getting back seven of the eight slices, with a note saying the interest is included. Nobody took their money. It just bought less every month, in an orderly fashion, with the full support of the institution in charge of the currency. It’s the only robbery in history where the victim got a receipt and a thank-you note.

A saver who saw it coming might have reached for the oldest exit there is, and found it locked. Under Executive Order 6102, Americans had been barred from holding monetary gold since 1933, and the ban held until the last day of 1974 (what happened when it lifted is the story of gold in the 1970s). Nobody padlocks a door that nobody uses.

How did the Treasury-Fed Accord of 1951 end the peg?

By early 1951, with the Korean War under way, the Fed wanted out; by February, inflation was running at an annualized 21%. In late January the President invited the entire Federal Open Market Committee, the Fed’s rate-setting body, to the White House. Afterward, a statement said the committee had “pledged its support to President Truman to maintain the stability of Government securities as long as the emergency lasts.”

The committee had made no such pledge. It was the Washington version of a parent telling the neighbors that the teenager has agreed to mow everybody’s lawn all summer. With conflicting stories in the papers, Fed governor Marriner Eccles released the committee’s own account of the meeting without consulting his colleagues. “The fat was in the fire,” he wrote later.

About a month later, on March 4, 1951, the Treasury and the Fed announced that they had “reached full accord” to “minimize monetization of the public debt.” Monetization of the public debt is the official phrase for a central bank creating money to buy the government’s bonds. In plain English: the dry ice.

The peg ended, and the Fed began setting interest rates on its own judgment again. The accord is remembered as the birth of the modern, independent Federal Reserve. From the saver’s side of the room, it was the moment the ice came off and everyone found out how warm the house had been all along.

What happened with Japan’s yield curve control?

Japan ran the longest modern version, and the most patient one.

In September 2016 the Bank of Japan set a target for the ten-year government bond yield of “around zero percent,” alongside a short-term rate of minus 0.1%. Lend the government of Japan your money for a decade and you would earn, approximately, nothing, and the central bank would buy whatever it took to keep it that way. It was a guarantee of nothing, backed by everything.

Then the room began to warm. Rather than take the ice off, the bank kept widening the range the thermometer was allowed to show: a little in 2018, more in 2021 and 2022. First the thermometer read 68. Then 68 or so. Then roughly 68. By October 2023 the 1% mark was a “reference” rather than a cap, which is central-bank language for 68, give or take.

Each change was announced as fine-tuning. Together they amounted to chipping a little ice off every year while insisting the thermometer still said 68.

Into the weeds: Japan’s band, step by step

According to the Bank of Japan’s own review, the yield was allowed to drift about 0.1 percentage points on either side of zero at first, then about 0.2 from July 2018, 0.25 from March 2021 and 0.5 from December 2022. In October 2023 the 1% level became a “reference” rather than a hard cap. To hold the line, the bank introduced what it called fixed-rate purchase operations, standing offers to buy bonds at the target yield, and from April 2022 it made them on consecutive days.

Along the way, the Bank of Japan came to own around half of all Japanese government bonds outstanding.

Half. Imagine a town where one resident owns half the houses and has promised to buy the other half at a fixed price whenever anyone asks. House prices in that town are wonderfully stable. It would be a stretch to call it a housing market. Every open house is attended by the same buyer, and he always pays the asking price.

The policy ended in March 2024, when the bank judged that its 2% inflation goal was, in its words, “in sight.” Of the three exits, it was the polite one: seven and a half years of ice, melted a chip at a time.

What happened to Australia’s yield target?

Australia’s turn was the shortest, and it’s the one central bankers study when they want to know how it goes wrong.

On March 19, 2020, as the pandemic hit, the Reserve Bank of Australia set a target of 0.25% for the three-year government bond yield. In November 2020 it cut the target to 0.10% and pinned it to one specific bond, the one maturing in April 2024. The message to the country was clear: borrowing would stay cheap for years. Australians took the hint and borrowed.

Then, in late October 2021, a stronger-than-expected inflation figure arrived. Investors began selling the April 2024 bond, and the whole market turned to see whether the bank would step in and buy.

It did not. In the days before its November meeting the yield climbed well above the target, and on November 2, 2021, the target was discontinued. By then the bank owned about 60% of the April 2024 bond. It had promised a temperature, piled on the dry ice to deliver it and then, when the room really did get warm, stepped away from the thermometer, whistling.

The bank’s own review, published the following June, described the result with a frankness central banks rarely allow themselves: “the exit in late 2021 was disorderly and associated with bond market volatility and some dislocation in the market. This experience caused some reputational damage to the Bank.” In central-bank prose, that is a scream. It’s a very polite houseguest writing “the shower ran a bit cold” in your guest book, after the pipes burst.

Who pays for yield curve control?

Credit where it’s due: yield curve control can work, in the narrow sense of doing what it says. The American peg helped pay for a world war, and Japan’s held for more than seven years. But capping an interest rate doesn’t make the cost of money disappear. It moves it, onto whoever is holding the bonds and the savings account while the cap sits below inflation.

That loss is the whole trick: it’s how a government shrinks a big debt without paying it back. The economists Carmen Reinhart and M. Belen Sbrancia went looking for the size of it in a 2011 study called The Liquidation of Government Debt. For the United States and the United Kingdom, they estimated that interest rates held below inflation wiped out debt worth 3 to 4 percent of GDP a year, on average. Applied to the US economy of 2025, that would be roughly $900 billion to $1.2 trillion a year, about the size of the government’s entire annual interest bill. It’s the household budget where Dad covers the electric bill by shrinking everyone’s allowance, and nobody notices until the ice cream truck comes.

It works like a tax that never appears on a form, never comes up for a vote and arrives in the mail as nothing at all. Savers just find, years later, that their money buys less than it used to.

The fair objection to holding gold instead is the obvious one. Gold pays no interest at all, while a capped bond at least pays something. That’s true. But in 1946 “something” was 2.5% against 17.6% inflation, which is a loss with a coupon attached. A cap can only shrink what a promise pays, and gold was never anybody’s promise.

Gold owes nothing to anyone, and it can’t be printed to buy bonds. Through every peg in this story it sat in vaults and drawers doing exactly what it did before: sitting there, weighing what it weighed. It was also the door they padlocked in 1933. Our dollar tool shows what a dollar from any year buys now, measured by the CPI and by gold. Try 1946.

Could it happen again?

It’s a tool central banks now know how to use, and all three cases sit in the official record, studied and reviewed. That’s as far as we’ll go. We don’t predict policy, and anyone who tells you the month it will happen is guessing.

What we will offer is a modest proposal, in the spirit of the thing. The Basement hereby announces its own Thermometer Assurance Program, or TAP. Under TAP, the thermometer in the Basement will read 68 degrees at all times. To guarantee this, we will tape whatever is required to the thermometer, in whatever quantity is required, for as long as is required.

We expect to buy very little ice, because everyone believes us. Savers will be compensated with a receipt and a thank-you note. Complaints may be submitted in writing and will be stored at 68 degrees. The gold in the corner is excused. It has no thermometer.

The furnace has not been consulted. It never is. Somewhere downstairs it’s still running, and the dry ice is on back order.

Sources

• The 1942 peg, postwar inflation and the 1951 Accord: Federal Reserve History, “The Treasury-Fed Accord”.
• Japan’s yield curve control, its bands, fixed-rate operations, the end in March 2024 and the bank’s share of government bonds: Bank of Japan, Broad-Perspective Review working paper on large-scale government bond purchases, 2024.
• Australia’s yield target, its end and the review’s verdict: Reserve Bank of Australia, Review of the Yield Target, June 2022.

Figures read October 3, 2026. Our own arithmetic: $1,000 at 2.5% against 17.6% inflation ($1,025 ÷ 1.176 ≈ $872); and 3 to 4 percent of 2025 US GDP, $30.762 trillion (BEA via FRED), against about $1.06 trillion of interest on the public debt from September 2025 through August 2026 (US Treasury), added October 25, 2026.

Questions people actually ask

What is yield curve control?

Yield curve control is a central bank policy that caps the interest rate on a government bond, usually a longer-term one, by promising to buy as many of those bonds as needed to stop the yield rising above a target. The United States used it from 1942 to 1951, Japan from 2016 to 2024 and Australia from 2020 to 2021.

How does yield curve control work?

Bond prices and yields move in opposite directions, so when a central bank buys bonds it pushes their price up and their yield down. Under yield curve control it promises to buy whatever is needed to hold the yield at its target. If investors believe the promise, the bank may need to buy little; if they doubt it, it may have to buy a great deal.

What is the difference between yield curve control and quantitative easing?

Quantitative easing sets the quantity: a central bank says how many bonds it will buy and lets the yield settle wherever it does. Yield curve control sets the price: the bank names a yield and buys whatever quantity it takes to hold it. Under yield curve control, the amount of buying is open-ended.

Has the US ever used yield curve control?

Yes. From April 1942 the Federal Reserve held Treasury bill rates at three-eighths of one percent with an implicit 2.5% ceiling on long-term bonds, to keep wartime borrowing cheap. The peg outlasted the war and ended with the Treasury-Fed Accord of March 4, 1951, after inflation reached an annualized 21% that February.

When did Japan end yield curve control?

The Bank of Japan ended yield curve control in March 2024, saying its 2% inflation target had come in sight. It had begun in September 2016 with a ten-year yield target of around zero, and the allowed range was widened several times, to 0.5% in December 2022 and a 1% reference level in October 2023.

What happened to Australia's yield curve control?

The Reserve Bank of Australia targeted the three-year bond yield from March 19, 2020, at 0.25% and later 0.10%. After strong inflation data in late October 2021 the yield rose well above target, and the bank discontinued the target on November 2, 2021. Its own review called the exit disorderly and said it caused some reputational damage.

Why does yield curve control matter for savers?

When a central bank holds bond yields below the rate of inflation, people holding those bonds or low-interest savings lose purchasing power each year. After the Second World War the US capped long-term bond yields at 2.5% while consumer prices rose 17.6% between June 1946 and June 1947.

What is a bond yield?

A bond yield is the yearly return an investor earns on a bond, as a percentage of the price paid for it. Because a bond's interest payments are fixed, its yield rises when its price falls and falls when its price rises. Government bond yields set the baseline for mortgages and other borrowing costs.

What is financial repression?

Financial repression is when a government keeps interest rates below inflation, often through caps like yield curve control, so that the real value of its debt shrinks over time. Savers holding bonds and low-interest deposits bear the cost. The US cap of 2.5% on long-term bonds while prices rose 17.6% between June 1946 and June 1947 is a classic example.