S&P 500 Returns Near-Equal Under Both US Parties — Citizens Bank Data Challenges Election-Driven Portfolio Timing

The Quick Take

• Citizens Bank data shows S&P 500 delivers near-equal returns under both Republican and Democratic administrations
• Presidential transition periods produce short-term volatility but do not alter long-run equity return trajectories
• Election-driven portfolio timing shifts historically underperform stay-invested strategies

Citizens Bank's research synthesises decades of S&P 500 performance across presidential transitions, finding average annualised returns broadly similar over full four-year terms regardless of party. The data spans periods of high inflation, recessions, wars, and technological revolutions, suggesting macro cycles and Federal Reserve policy exert far greater influence than the political complexion of any given administration. This finding has direct implications for investors tempted to reposition portfolios around election outcomes.

The data cuts against one of the most persistent retail investor behavioural biases: the belief that one political party is systematically better for equity markets. Advisers consistently cite election-driven de-risking as among the costliest portfolio errors, with investors who shift to cash or defensives around transitions historically underperforming those who maintain diversified equity exposure. Short-term volatility around elections reflects genuine policy uncertainty on tariffs and taxes, but this noise has rarely altered underlying earnings trajectories.

While short-term uncertainty around corporate tax rates, trade policy, and regulatory direction can create tactical sector rotations, the evidence that these effects persist over full presidential terms is weak. For long-horizon investors, Citizens Bank's historical analysis reinforces the case for maintaining strategic asset allocation through the transition rather than attempting to predict market direction from electoral outcomes. Political risk is best addressed through diversification and scenario hedging, not binary timing bets.

Synthesized from 2 sources.