Tether, the company behind the world's largest stablecoin, is quietly becoming one of the most important buyers of US government debt. The firm holds more than $122 billion in direct Treasury bill holdings, with total exposure exceeding $141 billion when indirect positions are included — an appetite for American paper that has already outpaced several sovereign nations. Against a US Treasury market measured in the tens of trillions of dollars, that stake remains modest in relative terms, but the speed of its accumulation is what has drawn attention.

From Stablecoin Issuer to Treasury Heavyweight

Every USDT token in circulation must be backed by reserves, and Tether has placed roughly 83% of those reserves in US Treasury bills. As USDT's market capitalization has grown to approximately $185 billion, the company has had to accumulate T-bills at a pace that would draw the attention of most central banks.

In 2024, Tether's net Treasury purchases totaled $33.1 billion, ranking it seventh among all foreign buyers of US debt. In 2025, the figure was $28.2 billion, again placing it seventh globally.

Tether has described itself as the fifth-largest purchaser of US Treasuries when hedge fund activity is excluded from the rankings. The company's CEO has said Tether expects to climb into the top 10 purchasers of T-bills in 2026, driven by continued USDT growth and new product lines.

What's Fueling the Growth

Tether reports adding approximately 30 million new users per quarter, bringing its total user base to around 530 million. Much of USDT's demand has historically come from users outside the United States, particularly in emerging markets where the token functions as a dollar-access tool for savings, remittances, and trading, which means demand for the token translates directly into demand for dollar-denominated reserve assets. Each new user who acquires USDT effectively generates demand for additional reserve assets, and Tether's reserve policy channels that demand directly into the Treasury market.

This flywheel produced more than $10 billion in profits for Tether in 2025, almost entirely from the yield on its Treasury portfolio — a revenue model that benefits from the elevated interest rates the Federal Reserve has maintained in recent years, since Tether pays no interest to USDT holders.

US Treasury Secretary Scott Bessent has publicly discussed the potential for stablecoin issuers to become a structural source of demand for T-bills, projecting that the sector could eventually absorb between $800 billion and $1 trillion in Treasuries as it scales.

Why Washington Isn't Complaining

Stablecoin legislation moving through Congress would formalize reserve requirements that effectively mandate Treasury holdings, creating a regulatory framework that locks in this demand. For a US government that has run persistent deficits and must roll over large amounts of debt annually, a new class of structural buyers is a welcome development. Tether's 83% allocation to Treasury bills stands in contrast to the opaque mix of commercial paper and other instruments that drew scrutiny in earlier years, a shift that followed years of pressure for greater reserve transparency.

The Risks That Come With Scale

If USDT were to experience a rapid redemption event, Tether would need to liquidate tens of billions of dollars in T-bills within a compressed timeframe. Treasury bills are among the most liquid instruments in the world, but selling $50 billion or more in a panic scenario could still create ripples in short-term funding markets.

Competitors such as Circle, the issuer of USDC, also hold substantial Treasury reserves, though at a smaller scale. As stablecoin legislation takes shape, the reserve requirements embedded in new laws could push the entire sector deeper into Treasuries, potentially validating Bessent's $800 billion to $1 trillion projection. What to watch going forward is whether Tether's user growth and USDT circulation continue at their recent pace, how the final reserve rules in legislation are written, and whether Tether follows through on its publicly stated ranking targets for 2026.