Do Midterm Elections Reduce Market Uncertainty? What Long-Term Investors Should Know

An election result can remove uncertainty without removing risk

Elections generate a large volume of confident market commentary. Investors are told that a particular result will be good for shares, bad for bonds or transformative for certain industries.

The reality is less tidy.

An election result can reduce uncertainty because it clarifies who controls government and which policies are more likely to progress. That may narrow the range of outcomes investors need to consider.

But it does not remove the underlying risks. Inflation, interest rates, corporate earnings, valuations and economic growth continue to matter after the votes have been counted.

For long-term investors, the useful question is therefore not whether one political party is good for markets. It is whether the result changes the assumptions supporting an investment.

Markets react to surprises, not just results

Financial markets are forward-looking. Prices reflect expectations about future profits, inflation, interest rates and risk.

If an election result broadly matches what investors expected, its immediate effect may be limited. If the result is a surprise, prices can move quickly as investors adjust their assumptions.

This distinction matters. A market can rise after an apparently unfavourable result if the outcome is less damaging than feared. It can also fall after a seemingly positive result if investors had already priced in an even better scenario.

Research into economic policy uncertainty supports the wider idea that elections can affect uncertainty, particularly when political outcomes and future policy choices are difficult to predict.

A sensible analysis should consider three questions:

1. What result had markets expected?
2. How did the actual outcome differ?
3. What does that difference change about future cash flows, inflation, interest rates or risk premiums?

Without those steps, an election-based investment decision is little more than a political opinion attached to a market forecast.

Why bond yields deserve attention

Government bond yields provide one route through which political expectations can enter financial markets.

Long-term yields can be viewed as a combination of expected future short-term interest rates and a term premium. The term premium is the additional compensation investors may require for holding a longer-dated bond, where inflation and interest-rate outcomes are less certain. The Federal Reserve Bank of New York's term-premium data provides further context on this framework.

Election outcomes can influence yields through several channels:

• Expectations for government borrowing and bond issuance
• Changes in expected taxation or public spending
• The possible effect of fiscal policy on inflation
• Expectations for economic growth
• The likely response from the central bank
• A higher or lower premium for policy uncertainty

Suppose investors expect wider budget deficits. They may anticipate greater bond issuance, stronger demand in the economy or additional inflation pressure. That could contribute to higher yields, although the result will depend on other factors.

Alternatively, an outcome associated with slower spending growth or fewer large policy changes could reduce some of the uncertainty priced into bonds.

It is rarely possible to isolate politics from everything else. Inflation releases, employment figures, central-bank communications and global demand for safe assets can all move yields at the same time.

Higher yields can affect more than bonds

Changes in government bond yields can influence the valuation of other assets.

A higher risk-free rate increases the discount rate applied to future company cash flows. This can place greater pressure on investments whose valuations depend heavily on profits expected many years from now.

Higher yields can also make government bonds more competitive with shares and increase borrowing costs for households and companies. Property, infrastructure and highly indebted businesses may be particularly sensitive to financing conditions.

Yet investors should avoid assuming that rising yields automatically mean falling share prices. Yields might rise because growth expectations have improved, while company earnings expectations are also increasing.

Context matters. Investors need to ask why yields are moving rather than reacting to the direction alone.

The difficulty of making an election trade

Turning an election forecast into a profitable trade requires several correct judgements.

An investor must anticipate the result, understand what was already reflected in prices, predict which policies will actually be implemented and estimate their economic consequences. They must then identify which assets will benefit and decide when to enter and exit.

Even an accurate political forecast can therefore lead to a poor investment outcome.

Long-run research highlighted by Vanguard found no statistically significant difference between presidential election years and non-election years for a balanced US stock and bond portfolio. This does not mean elections are irrelevant. It shows why broad portfolio decisions should not rest on election calendars alone.

Policy can have meaningful effects on individual industries. Taxation, trade, regulation, energy policy and public spending may change business economics. The appropriate response is to examine balance sheets, competitive positions, cash flows and valuations, rather than relying on a slogan about which party has won.

Use political volatility as a portfolio check

An election can be a useful prompt to review a portfolio, but a review is different from a wholesale reaction.

Investors might consider:

• Whether asset allocation still matches their time horizon
• Whether any single company, sector or country has become too large
• Whether near-term spending needs are exposed to unnecessary volatility
• Whether holdings depend on one narrow political or economic outcome
• Whether portfolio changes are being driven by evidence or emotion
• Whether rebalancing rules have been followed consistently

Concentration deserves particular attention. Political headlines can encourage investors to add to assets that support their existing beliefs, leaving them exposed if events take a different path. A predefined process can help investors reduce an excessive concentration without letting emotion take control.

Political and legislative uncertainty can also affect specific assets more directly than the broad market. Investors should distinguish between temporary uncertainty and a genuine change to an investment's long-term economics, as illustrated by the issues considered in this article on portfolio valuation and legislative uncertainty.

Keep the investment plan bigger than the election cycle

Election results may narrow the range of possible policies, helping markets assign clearer probabilities to future outcomes. That can reduce one form of uncertainty, but it cannot make investing predictable.

Long-term returns remain connected to earnings, valuations, inflation, interest rates, productivity and economic growth. Political decisions can influence those factors, but election-night narratives rarely capture the full chain of consequences.

The durable approach is to separate personal political views from portfolio construction. Diversification, an appropriate time horizon and disciplined rebalancing are more reliable risk controls than attempting to predict the next political headline.

Politics matters. It simply should not be allowed to become the whole investment process.