The US Treasury Is Buying Back Its Own Bonds: Why It Matters Even If the Debt Doesn’t Fall

The United States is not making its debt disappear. It is, however, intervening in the way in which a portion of that debt is managed in the market. The doubling of buybacks on long-dated Treasuries drove bond prices sharply higher and pushed the 30-year yield down by approximately 15 basis points relative to the high reached the previous day.

To understand what happened, one need only start from a simple principle: when the price of a bond rises, its yield falls. On 18 August, the 30-year Treasury had reached a yield of approximately 5.337%, its highest level since 2007. The following day, after the announcement by the US Treasury, the yield fell to approximately 5.187%.

What the US Treasury has decided

From 9 September, the Treasury will at least double the size of the operations through which it repurchases its own long-dated securities. In the 10-to-20-year and 20-to-30-year segments, the cap will rise from $2 billion to at least $4 billion per individual operation.

These purchases serve primarily a liquidity support function: the Treasury withdraws certain less liquid bonds from the market, making it easier for dealers and investors to trade them.

Is US debt being reduced?

No. This is the point not to conflate.

If the Treasury repurchases an existing bond, it must still finance that expenditure within its overall funding requirement. It therefore does not represent a cancellation of America's fiscal problem.

The difference lies in composition. The government can choose how much of its debt to issue at the short, medium, or very long end. This choice influences both the cost of interest payments and the risk of having to refinance large quantities of debt in the future.

A simple example: a long-term mortgage or a revolving facility?

Imagine a household choosing between a 30-year fixed-rate mortgage and a short-term facility to be renewed periodically.

The long mortgage may cost more today, but it locks in the rate for many years. The short-term facility may cost less in the near term, but it carries the risk that, when the time comes to renew it, rates may be substantially higher.

For a sovereign, the principle is analogous.

Does this mean the US is shortening the maturity of its debt?

Not necessarily. The Treasury has specified on multiple occasions that the buyback programme was established primarily to improve market liquidity, and not to materially alter the average maturity of the public debt.

It would therefore be an overstatement to say that Washington has already launched a major duration-shortening strategy. It is, however, accurate to say that the management of buybacks alters the quantity of long-duration paper that investors must absorb at the margin, and this can influence yields.

Why the 30-year bond rose so sharply in price

The market interpreted the announcement as a clear signal: the Treasury is prepared to increase its presence as a buyer in the long segments.

Less available supply and greater liquidity tend to support prices. This is why the 30-year yield fell sharply from around 5.34% towards 5.19%.

This does not mean that the problems of deficit, inflation and debt have disappeared. It means that a new force has emerged capable of counteracting, at least in part, the upward pressure on yields.

The 20-year auction test

On the same day, the Treasury sold $16 billion in new bonds with a twenty-year maturity.

The auction closed with a yield of 5,204% and a bid-to-cover of 2.53 times. Investors therefore bought, but demanded a yield slightly above that available in the market just minutes before the auction.

Can the cost of debt decrease?

Potentially yes, but not automatically.

If buybacks help push long-term yields lower, the Treasury could in future issue new long-dated bonds on better terms. This would reduce the marginal cost of new debt.

But if a larger share of financing were shifted towards short maturities, the risk of having to refinance that debt frequently would increase. Should future rates be higher, the initial advantage could shrink or even reverse.

Why this matters even for those who do not buy Treasuries

US government bond yields are one of the principal benchmark rates for the entire global financial system. A 30-year yield sustainably above 5% influences mortgage costs, corporate credit, the value of corporate bonds and equity valuations as well.

If the Treasury manages to relieve some of the pressure on the long end of the curve, the effect can therefore ripple well beyond the government bond market.