2026 U.S. Midterms May Shift Treasury Yields, but History Offers No Clear Signal, Laurence Allen Says
Investment markets veteran Laurence Allen has published a new commentary examining the potential impact of the 2026 U.S. midterm elections on 10-year Treasury yields, concluding that political outcomes may influence bond markets through fiscal policy but do not provide a dependable trading signal.
In his Oct. 29 analysis, U.S. Midterms and the 10-Year Treasury: No Dependable Trading Rule, Allen evaluates three potential congressional outcomes under a Republican president and compares historical Treasury yield movements following the 1986, 2006 and 2018 midterm elections.
The commentary distinguishes between political control of Congress, the government’s ability to enact fiscal legislation and the broader economic forces determining long-term interest rates.
Historical Treasury Yield Data Shows Mixed Outcomes
Allen’s research examines changes in average 10-year Treasury yields between November of each election year and November of the following year.
The historical comparisons show materially different outcomes:
| Midterm election | 10-year Treasury yield | Change |
|---|---|---|
| 1986 | 7.25% to 8.86% | +161 basis points |
| 2006 | 4.60% to 4.15% | −45 basis points |
| 2018 | 3.12% to 1.81% | −131 basis points |
Although Treasury yields declined following the 2006 and 2018 elections, they increased substantially after the 1986 election.
Allen notes that economic developments, including credit market conditions, Federal Reserve policy, trade tensions and growth expectations, contributed to these different outcomes.
The analysis cautions against attributing subsequent Treasury market movements directly to election results.
Three Congressional Outcomes and Their Bond Market Implications
Allen identifies three potential scenarios for the 2026 midterms.
Democrats win both chambers: Democratic control of Congress would create divided government, potentially restricting additional Republican tax cuts or spending initiatives. This could reduce expectations for incremental Treasury borrowing and ease upward pressure on yields. However, divided government would not automatically reduce existing deficits.
Democrats win the House only: A Democratic House could block major fiscal legislation while Republicans retain Senate control. Allen identifies the 2018 midterms as the closest recent precedent but cautions that the subsequent Treasury rally was influenced by broader economic conditions.
Republicans retain both chambers: Continued Republican control of Congress would preserve the administration’s ability to pursue additional tax-and-spending legislation. If investors anticipate larger deficits and increased Treasury issuance, the outcome could create upward pressure on long-term yields.
Across all three scenarios, Allen emphasizes that market reactions depend on enacted policies, inflation, economic growth and Federal Reserve decisions rather than congressional control alone.
Implications for Institutional Investors and Private Markets
Treasury yields serve as an important reference point for financing costs, asset valuations and investment decisions across public and private markets.
Changes in long-term government borrowing costs can influence private credit pricing, leveraged buyout financing, infrastructure valuations and institutional portfolio allocations.
For private-market investors, the commentary provides a framework for assessing election-related interest-rate risks without relying on assumptions that a particular political outcome will automatically produce a bond rally or selloff.
Allen’s central conclusion is that fiscal expectations must be evaluated alongside economic fundamentals and the policies investors have already incorporated into market prices.
About Laurence Allen
Laurence Allen has more than 30 years of experience in executive roles overseeing trading and investment management teams. His background includes developing data algorithms and secondary-market liquidity solutions for alternative assets, private debt and mortgages. Allen holds an MBA and a bachelor’s degree from the Wharton School.
