Is Yield Curve Control (YCC) Coming for US Treasuries?

The US Treasury Department intervened at a vulnerable moment for the long end of the yield curve, effectively using debt management tools to mitigate further rises in long-term interest rates. On the morning of August 19 (US Eastern Time), the US Treasury announced it would double the scale of liquidity-supporting repo operations for nominal coupon-bearing Treasuries with maturities of 10–20 years and 20–30 years, increasing the single-operation cap from $2 billion to no less than $4 billion. The program will take effect on September 9 and continue until the end of the current refinancing season (November 4). The market reacted quickly, with the 10-Year Treasury Yield and 30-Year Treasury Yield declining, while US stock futures rose in tandem.

Compared to the scale of the intervention, the timing was more critical. The Treasury had just published its quarterly buyback schedule two weeks prior; announcing additional measures at this juncture indicates an unplanned adjustment driven by market conditions. In overnight trading on August 18, the 30-year yield hit a near 19-year high intraday; the winning bid rate for the $25 billion 30-year auction on August 13 was 5.216%, the highest since 2001, while the 10-year auction the previous day also reached its highest level since 2007.

The core of the operation lies in maturity transformation. The cash requirements for the repo operations are covered by the Treasury’s regular issuance plan, with the focus on conducting maturity transformation by "selling short and buying long." This is fundamentally different from the Federal Reserve’s Reserve Management Purchases (RMP): RMP purchases short-term debt with maturities of less than one year to replenish reserves in the banking system, making it a quantitative tool. The Treasury’s repos do not involve money creation or balance sheet expansion, classifying them as structural tools.

For the market, the signaling significance outweighs the immediate effect. Between September 9 and November 4, there will be seven long-end operations affected by the new policy, with the total cap rising from $14 billion to no less than $28 billion. However, the incremental scale is difficult to realize directly in both the spot and total volume dimensions.

On one hand, given the monthly supply of coupon-bearing debt amounts to hundreds of billions of dollars, this scale does not change the total debt volume but rather serves to enhance bidding willingness in auctions. On the other hand, the first operation after the expansion will occur on September 10, providing no mechanistic support for the late-August auctions.

The Treasury’s decision to announce this on the day after the 30-Year Treasury Yield hit a new high is more likely aimed at reinforcing market expectations regarding long-end supply and demand, rather than directly altering the outcome of any specific auction.

The real highlight is the shifting boundary between fiscal and monetary functions. Constrained by inflation and politics, the Federal Reserve will neither restart quantitative easing in the short term nor has the capacity to purchase long-term bonds. The Treasury, through its issuance maturity structure and repos, has effectively assumed part of the yield curve management function.

In the short term, this is an effective technical arrangement launched at a time when long-end US Treasury yields were rising rapidly. In the medium term, however, the impact may fall short of expectations. While the Treasury’s support lowers premiums, the uncertainty brought by discretionary policy raises them. The final net effect will be asymmetric; expanding the repo scale is unlikely to stop the rise in the central tendency of term premiums, and the magnitude of yield declines achievable through repos will correspondingly diminish.

Looking further, this operation implies a certain tacit understanding constructed between fiscal and monetary authorities. The funds for repurchasing long-term bonds are covered by issuing short-term debt. If the Federal Reserve raises interest rates in September, the Treasury’s short-end financing costs will rise immediately, while higher policy rates will also push up the long end, potentially widening term premiums again. The cost and effectiveness of this operation may both rest on the premise that the Federal Reserve tacitly chooses to "stand pat."

From a monetary policy perspective, the impact of this move is neutral to slightly positive, but the direction may be contrary to market intuition: this operation does not create room for the Federal Reserve to cut rates, but merely temporarily decouples long-end pricing from the policy path. Looking ahead, more important observation points are the Jackson Hole meeting at the end of August and the August economic data released before the September FOMC meeting.

Risk Warning and Disclaimer

The market involves risks, and investment should be approached with caution. This article does not constitute personal investment advice, nor does it take into account the specific investment objectives, financial status, or needs of individual users. Users should consider whether any opinions, views, or conclusions in this article align with their specific circumstances. Investment decisions made based on this content are the sole responsibility of the investor.