US 20-year bond auction clears at record 5.42% yield as foreign demand hits all-time low
US 20-year bond auction posts worst result on record
On September 15, 2026, the US Treasury sold $13 billion of 20-year bonds at a 5.42% yield — the highest borrowing cost for that maturity since modern record-keeping began in 1986. Foreign buyers took the smallest share on record.
The sale closed at 1 p.m., only hours after Treasury Secretary Scott Bessent told Congress the government had just run two of its best bond auctions in decades.
Key numbers from the sale
- 5.42% yield-to-maturity — the effective yearly return for buyers — the highest for a 20-year sale since 1986.
- The bonds carried a 5.125% coupon and were sold below face value, which lifts the effective yield to 5.42%.
- Indirect bidders — overseas buyers such as foreign central banks — took 52.5%, down from 62.9% in August. That was the lowest share on record for a 20-year auction, apart from a small $25 million special auction in 2021.
- Bids covered the sale 2.57 times, below the 2.65 average of the previous six auctions.
- The auction "tailed" by two basis points (0.02%): 20-year bonds traded near 5.40% just before the sale, so the Treasury paid slightly more than the going market rate to find enough buyers. It was the worst tail for a 20-year auction since 2024.
What Bessent said, and the pushback he got
Speaking at a US House hearing on the morning of the sale, Bessent said: "We then proceeded to have the two most successful treasury auctions that we've had in 20 years, and the US bond market, since President Trump has come in, has been the best performing bond market in the developed world."
His claim had a real basis: the previous week's 10-year and 30-year sales went smoothly, with indirect bidders taking 79.5% of the $22 billion 30-year bond sale on September 10.
Connecticut Democrat Jim Himes challenged him at the same hearing: "Wait, wait, wait. The 10-year went up by 20 basis points. How can you say it was successful?" Hours later, the 20-year auction produced a worse result than either of the sales Bessent praised.
Why this matters beyond the bond market
Treasury yields act as the floor for other borrowing costs. The average 30-year US mortgage rate currently stands at 6.76%.
The US now carries $40.1 trillion in outstanding debt, with annual interest payments above $1.1 trillion — the government's second-largest expense after Social Security. Debt-to-GDP sits at 123%, a level the source describes as a growing concern for bond investors.
Weak foreign demand matters because Washington wants to sell as much of its debt as possible to buyers abroad. Protos separately reported that bond-market dynamics helped push bitcoin to an all-time high, which is why crypto traders watch Treasury auctions closely.
What is still unclear
The source reports the record-low foreign share but does not explain why overseas buyers stepped back.
What happens next
The next 20-year US bond auction is scheduled for October 21, 2026.