US Treasury doubles buyback sizes while keeping debt auction schedule unchanged

The US Treasury is doubling the size of its liquidity support buybacks for longer-dated debt while keeping its regular auction schedule completely untouched.

The announcement, made on August 19, lays out a plan to increase maximum buyback sizes from $2 billion to at least $4 billion per operation for nominal coupon securities with maturities between 10 and 30 years. The expanded operations kick in on September 9 and run through November 4.

Steady auctions, bigger buybacks

The Treasury’s most recent quarterly refunding, dated August 5, confirmed that auction sizes remain unchanged. That means $58 billion in 3-year notes, $42 billion in 10-year notes, and $25 billion in 30-year bonds, totaling $125 billion.

Of that amount, roughly $96.3 billion goes toward refunding maturing securities. The remaining $28.7 billion represents net new borrowing.

The buybacks specifically target “off-the-run” securities, which is bond-market speak for older issues that don’t trade as frequently as the newest ones. These securities can become illiquid over time, sitting on dealer balance sheets and gumming up the plumbing of the Treasury market.

Why the Treasury is stepping in now

Longer-dated Treasuries have been under pressure since late June, with what market participants have described as a buyers’ strike in longer-duration debt. When fewer people want to buy 10- and 30-year bonds, dealers end up holding more inventory than they’d like, which strains their balance sheets and makes the market less efficient for everyone.

The Treasury’s response is essentially to act as a relief valve. By purchasing older bonds from dealers at competitive prices, the program frees up balance sheet capacity and encourages continued participation in new auctions.

This approach builds on infrastructure the Treasury first put in place in 2024, when it launched its liquidity support buyback program. The decision to double the maximum size reflects what the Treasury has characterized as strong dealer participation and high-quality offers in previous rounds.

Market reaction and what it signals

Yields on longer-dated Treasuries declined following the announcement. The yield decline suggests traders view the expanded buybacks as a credible commitment to maintaining orderly conditions in the long end of the curve.

For investors watching the bond market, the combination of unchanged auction sizes and expanded buybacks creates an interesting dynamic. New supply stays constant while the government absorbs more old supply, effectively tightening the net availability of longer-dated paper in the market.

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