US Interest Payments Reach $1.27 Trillion Amid Rising Treasury Borrowing Costs

The US government has incurred $1.27 trillion in interest payments during the first 11 months of fiscal year 2026, marking a $139 billion increase from the same period last year. This 13% jump sets a new record for the cost of servicing the national debt, surpassing the entire Department of Defense's budget and making interest payments the second-largest category of federal spending after Social Security.

The total US public debt now ranges between $39 to $40 trillion, with interest payments climbing as older Treasury securities with low yields mature and are replaced by new ones that carry significantly higher yields. The acceleration in interest costs is notable, with previous fiscal years seeing increases of only 7% to 9%.

In August 2026 alone, gross interest reached $97.7 billion, although this was a slight decrease from the previous month due to changes in inflation accruals on Treasury Inflation-Protected Securities. For the full fiscal year 2025, net interest payments totaled approximately $970 billion.

The increase in interest payments can be traced back to the pandemic era when the federal government borrowed extensively to fund emergency relief programs. With the Federal Reserve raising rates in 2022 to combat inflation, the cost of servicing this debt has surged, creating an unprecedented fiscal burden.

Looking ahead, the Congressional Budget Office projects that net interest outlays will reach $16.2 trillion over the next decade, with annual payments expected to rise from $1 trillion in FY2026 to $2.1 trillion by 2036 under current fiscal policies.

Rising Treasury Borrowing Costs

Simultaneously, short-term borrowing costs for US Treasuries have surged as investors increasingly take short positions. The two-year Treasury yield rose to 4.74%, its highest since mid-2024, while 10-year yields reached levels not seen since 2007. A recent JPMorgan survey indicated that short positions in Treasuries increased by 10 percentage points in just one week, highlighting a growing bearish sentiment among investors.

This trend is influenced by expectations of a Federal Reserve rate hike, with markets pricing in a high probability of an increase following recent inflation data. The rising yields on short-term government debt could have widespread implications, raising borrowing costs across various sectors, including corporate credit and mortgages.

New Insights on Federal Reserve Rate Hikes

Polymarket bettors currently reflect an 84% probability that the Federal Reserve will raise interest rates again before the end of 2026. This follows the Fed's recent decision on September 16 to increase rates by 25 basis points, bringing the target range to 3.75%-4.00%.

Traders are estimating approximately 57% odds for exactly two total hikes in 2026, indicating that the recent increase may not be the last. Additionally, there is a near 50-51% chance of another hike occurring in October.

The core PCE inflation rate stands at 3.4%, significantly above the Fed's 2% target, prompting discussions of further tightening. The updated dot plots from the September meeting suggest a path toward additional rate increases, with expectations that the target range could reach 4.00%-4.25% by year-end if the current predictions hold true.