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Treasury yields reach two-decade highs as US debt tops $40 trillion

A bond sell-off has pushed long yields to levels last seen two decades ago, and budget forecasters have modelled what higher rates would do to the debt path.

Assembled by Claude from 11 sources at 11 outlets · Sunday, September 27, 2026, Evening edition, 5:21 PM EDT · no human byline

Disclosure. This item was assembled by an AI from the RSS excerpts of the outlets tagged inline. No human wrote or checked it before publication. Feed selection and categories are editorial choices by Teresa Lo. Nothing here is investment advice.

What happened

US bond yields have surged to the highest levels in two decades fortune.com. Treasury yields hit 20-year highs 247wallst.com, and bond yields reached historic highs in Tokyo and Washington at the same time investx.fr. Last week's seven-year Treasury note auction cleared at a high yield of 5.085% tipswatch.com.

US debt has hit $40 trillion hindustantimes.com; the national debt recently topped 40 trillion dollars qctimes.com. Annual interest payments on that debt have surged to 1 trillion dollars, pushing the federal deficit close to 2 trillion inshorts.com. One account put debt interest payments at a record 1.38 trillion dollars, or 4.2 percent of GDP, amid a historic bond sell-off upday.com.

Why it matters to investors

Budget forecasters have put numbers on the feedback loop. In a modelled scenario, higher rates would lift US debt to 222% of GDP by 2056 tokenpost.com, a level 47 percentage points above the extended baseline, while raising deficits and slowing average annual GDP growth tokenpost.com. The Congressional Budget Office suggests the total deficit could rise to 14% of GDP by 2056 news.ssbcrack.com.

Published summaries of that work differ on the growth effect. One cites a CBO estimate that GDP growth will be 0.1 percentage point below baseline fortune.com; another cites an estimate 0.05 percentage point higher on a different measure, and a debt path 74 percentage points below the CBO's baseline projection for 2056 hindustantimes.com. The mechanism underneath is unglamorous: interest payments crowd out other spending qctimes.com.

What to watch

Treasury is responding on the supply side. Treasury Secretary Scott Bessent announced plans to double long-dated bond buybacks to stabilize rising long-term rates cpbj.com. Whether buybacks can hold the long end down while the deficit runs near 2 trillion dollars is the test inshorts.com.

The buyback plan is a maturity-management tool rather than a fiscal one. It can change where along the curve the pressure lands, but it does not change the quantity of debt being financed, and that quantity has just passed 40 trillion dollars hindustantimes.comqctimes.com.

The move is global rather than American. Institutional investors, long forced to chase yield in alternative assets, are being pulled back by what one account calls a deep recomposition of global capital flows investx.fr, and Japan's market has come under similar pressure upday.com. The near-term markers are clearing yields of the kind seen in the seven-year sale tipswatch.com, the pace at which interest costs climb toward and past the 1.38 trillion dollar record upday.com, and whether the 20-year high in Treasury yields turns out to be a ceiling or a waypoint 247wallst.comfortune.com.

Sources

  1. tokenpost.com: Higher Rates Would Lift U.S. Debt to 222% of GDP by 2056 | TokenPost (2026-09-27)
  2. news.ssbcrack.com: Treasury Yields Surge, Sparking Debt Concerns in Congress - SSBCrack News (2026-09-27)
  3. hindustantimes.com: US debt hits $40 trillion: Why are soaring Treasury yields making it worse? (2026-09-27)
  4. fortune.com: Here's how much worse US debt could get as bond yields surge to the highest levels in two decades (2026-09-27)
  5. inshorts.com: US debt interest hits $1 trillion, deficit nears $2 trillion - Inshorts (2026-09-27)
  6. qctimes.com: Letter: It's time to prioritize sensible tax policy (2026-09-27)
  7. upday.com: $1.38 Trillion US Debt Bill as Historic Bond Sell-Off Sends Global Yields Soaring (2026-09-27)
  8. investx.fr: Bond Yields Hit Historic Highs in Tokyo and Washington - InvestX (2026-09-27)
  9. 247wallst.com: Treasury Yields Hit 20-Year Highs. Here's Where Smart Income Investors Should Pivot Today (2026-09-27)
  10. tipswatch.com: Tremors are rippling across the U.S. Treasury market - Tipswatch.com (2026-09-27)
  11. cpbj.com: Treasury secretary Bessent plans bond buybacks to curb long rates (2026-09-27)