US Treasury to auction $92B in 3-month bills on August 31, temporarily draining market liquidity

The US Treasury is set to auction $92 billion in 3-month bills on August 31, continuing a weekly cadence that has held steady at that offering size since late June 2026. Settlement is scheduled for September 3, meaning billions of dollars will flow out of private markets and into government coffers right after the long weekend.

For context, the Treasury’s general account balance at the Federal Reserve was sitting near $940 billion in late August, giving the government a substantial war chest as it manages its borrowing needs heading into the fall.

What the last auction tells us

The most recent 3-month bill auction, held on August 24, offered a useful snapshot of current demand dynamics. The high discount rate came in at 3.715%, translating to an investment rate of 3.803%.

More telling was the bid-to-cover ratio: 3.08, up from 2.86 the prior week. That ratio measures how many dollars of bids come in for every dollar of bills on offer.

Secondary market rates for 3-month bills have hovered around 3.71%. The Treasury has maintained the $92 billion offering size for its weekly 3-month auctions since June 29, 2026.

The liquidity mechanics

Noncompetitive tenders for the August 31 auction are due by 11:00 a.m. ET, with competitive tenders closing at 11:30 a.m. ET. Settlement falls on September 3, the first business day after Labor Day weekend.

Bond buybacks add a new variable

Treasury Secretary Scott Bessent has confirmed that expanded bond buyback operations are set to begin on September 10, 2026, just a week after this auction settles.

Bond buybacks involve the Treasury purchasing older, less liquid bonds from the market, effectively swapping them for newer, more liquid issues. When the Treasury buys back bonds, it pushes cash back into the market. When it auctions new bills, it pulls cash out. With both happening in close sequence during early September, market participants will be watching the interplay closely.

The strong bid-to-cover ratio of 3.08 indicates ample demand, with indirect bidders — a category that typically includes foreign central banks and large institutional buyers — showing particular interest.

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