Treasury Uses Stablecoins for Short-Term Debt Amid Long-Bond Challenges

Introduction

The role of stablecoins in the U.S. government debt market is becoming increasingly significant. While the recent legislative measures, particularly the GENIUS Act, are channelling stablecoin demand into urgent cash and short-duration investments, the challenge remains for the Treasury concerning its long-bond obligations.

The GENIUS Act and Stablecoin Regulation

Passed in July 2025, the GENIUS Act establishes new reserve rules for payment stablecoins. This legislation mandates that issuers must hold reserves of at least one dollar for each stablecoin in circulation. The eligible reserves can include U.S. currency, Federal Reserve deposits, bank cash deposits, and Treasuries with a maturity of 93 days or less. This framework ensures stablecoins support liquidity in short-term monetary markets.

The focus on the 93-day maturity limit channels stablecoin reserves into primarily cash-like assets, effectively encouraging a demand for Treasury bills and other short-term instruments. As issuers adapt to these regulations, the reserve mandates redefine how stablecoins are utilized within federal finance.

Impact on Treasury Debt and Yields

Research indicates that the inflow of stablecoin demand can lower the yields on three-month Treasury bills. For instance, a $3.5 billion stablecoin inflow was associated with a reduction of about 0.71 basis points in bill yields immediately following the inflow, with further declines observed over subsequent days. However, these effects seem to diminish for longer-duration bonds such as the 10- to 30-year securities, indicating that stablecoin reserves primarily affect the short end of the yield curve.

Current Yields in Context

As of August 28, 2026, the 10-year Treasury yield was reported at 4.73%, the 20-year yield at 5.21%, and the 30-year yield at 5.22%. Notably, these yields remain well above the GENIUS Act threshold of 93 days for setting reserves, showing the limited influence of stablecoin issuance on the long bond market.

Revamping Long-End Buyback Operations

In response to these liquidity challenges, the Treasury Department announced on August 19 that it would begin significantly increasing its buyback capacity for longer-duration bonds. Starting on September 9, the capacity for buybacks in the 10- to 20-year and 20- to 30-year segments will double, moving from a maximum of $2 billion to at least $4 billion per operation. This increase aims to enhance liquidity for older bonds that may not trade as readily on the market.

Details of the Buyback Plan

• The buyback operations will occur on several key dates: September 10, September 24, October 1, October 8, October 15, October 27, and November 4.
• The overall capacity across these operations will rise from $14 billion to at least $28 billion.
• This buyback structure differs from conventional quantitative easing since it involves retiring the securities and financing buybacks through regular issuance.

Stablecoin Demand and Market Dynamics

Stablecoins such as USDC provide a live example of how reserves operate within the prescribed framework. As of June 30, 2026, USDC circulation reached $73.269 billion. A subsequent report indicated that by July 31, USDC reserves had slightly declined to $71.826 billion, overwhelmingly concentrated in short-duration instruments.

Specifically, around $60.717 billion was allocated to the Circle Reserve Fund, with significant portions in overnight Treasury repos and short-maturity Treasuries. This orientation indicates that stablecoin market growth can indeed direct funds into short-term Treasury demand, yet the challenge in connecting these transactions to long-duration bonds persists.

Market Observations and Upcoming Regulations

The Treasury Borrowing Advisory Committee highlighted the distinction between stablecoin issuance and new federal financing; while stablecoins might increase the liquidity for Treasury bills, they do not necessarily create new lenders for long-duration bonds. The upcoming final rules from the Office of the Comptroller of the Currency could further clarify these dynamics.

Expected Rule Implementation Timeline

The final implementing rules for the GENIUS Act are anticipated to be issued by November 2026, with an effective date set for January 18, 2027, or 120 days after those rules are finalized. These regulations will further shape how issuers structure their reserves and interact with governmental financing.

Key Takeaways

• Stablecoins are now required to maintain reserves primarily in assets with 93 days or less maturity under the GENIUS Act.
• The upcoming Treasury buyback operations will increase liquidity support, anticipating liquidations in long-end bonds as high as $28 billion.
• Current research suggests limited impact of stablecoin demand on long-duration bond prices, focusing instead on short-term Treasury yields.
• The final implementation of the GENIUS Act regulations is expected in November 2026.

Conclusion

While the U.S. Treasury is leveraging stablecoins to manage short-term debt, the broader implications for its long-term bond market remain complex. The introduction of new regulations and enhanced buyback capabilities will test the effectiveness of these measures in achieving sustainable liquidity across federal financial markets.