UK government bond, or gilt, markets are paying close attention as the country approaches the local elections in May, explains Aberdeen Investments.
Local elections in isolation rarely move markets. What matters instead is the signal they send about the broader direction of national politics, including voter sentiment, party momentum and the policy choices that may follow in future Budgets.
Luke Hickmore, Investment Director – Fixed Income, at Aberdeen Investments, explains: “Bond markets are not casting a vote in May, but they are actively pricing what the outcome might mean. Political uncertainty translates into higher term premia, higher yields and ultimately a higher cost of borrowing for the UK.
“For fixed income investors, the conclusion is clear – politics is not background noise. In today’s gilt market, it is a fundamental part of the investment signal.”
Aberdeen Investments looks at the five things investors need to know about politics and bonds, and how the market might react to the May elections.
Five reasons why politics matters to bonds
1) At its core, a government bond is a promise: fixed interest payments over time, repaid in the currency the government controls.
2) Fiscal policy, which directly affects the supply of government bonds. Decisions on tax and spending determine how much the government needs to borrow. Higher expected borrowing means more gilts entering the market, which typically pushes yields higher as investors demand compensation for absorbing additional supply.
3) Inflation outcomes, which are inseparable from political choices. Policies around fiscal stimulus, energy support, public sector pay, and regulation all influence inflation dynamics. Higher or less predictable inflation reduces the real purchasing power of future bond payments, making long‑dated debt less attractive unless yields rise.
4) And perhaps most critically, institutional credibility.. Investors place significant weight on respect for the independence of the Bank of England, the integrity of the Office for Budget Responsibility’s forecasts, and adherence to established fiscal rules. When confidence in these institutions weakens, markets tend to demand a higher risk premium.
5) In addition, understanding ‘term premium’ is key. The channel through which political uncertainty feeds into bond yields is known as the ‘term premium’. Put simply, this is the extra return investors require for lending to the government for longer periods, rather than rolling over a series of short‑term loans.
So what is ‘term premium?’
In theory, a 10‑year bond yield should reflect the average of expected short‑term interest rates over that period. In practice, yields are often higher because a great deal can change over a decade, from inflation trends to fiscal priorities and political leadership. The term premium rises when investors feel less confident about those longer‑term outcomes, and falls when the outlook feels stable and predictable.
For much of the 2010s, term premium in the UK and other developed markets was close to zero, or even negative. Since 2022, it has moved structurally higher as volatility in inflation, rising debt levels and political uncertainty have returned to the foreground.
What the May elections could signal
Markets will be watching closely for clues on several fronts. A shift toward a looser fiscal stance, or weaker commitment to existing spending rules, typically weighs on longer‑dated gilts.
Signals around tax policy can influence growth expectations and, by extension, the future path of Bank of England interest rates. Investors will also be alert to any implications for the government’s borrowing plans, as the remit of the Debt Management Office ultimately reflects political decisions.
Markets also remain sensitive to any suggestion of friction between government and institutions such as the Bank of England or the Office for Budget Responsibility. In the run-up to May’s local elections, investors will listen closely to campaign rhetoric and messaging from the main parties for clues on priorities after the vote – particularly around respect for institutional independence, commitment to fiscal rules and the role of independent oversight. Even small shifts in tone can affect how much risk investors are willing to absorb at the long end of the curve.
How bond markets may react
Different political interpretations could lead to very different market outcomes. A broadly market‑friendly, status‑quo signal would likely result in minimal movement, with modest easing in risk premia. Clear signs of fiscal loosening could push longer‑dated yields higher, steepening the yield curve as term premium rebuilds.
Alternatively, signals that point toward weaker growth could lead to a rally at the short end of the curve as markets price earlier interest‑rate cuts, while longer yields lag. More severe credibility shocks are unlikely, but investors remain mindful of recent history and the speed with which confidence can evaporate.
Unlike the stock market, which focuses on company‑specific earnings, gilt investors are concerned with inflation, borrowing needs and policy stability over many years. A gilt issued today may not mature for decades, and small changes in the political outlook can have an outsized impact on how much compensation investors demand to hold that risk.
Luke Hickmore concludes:
“Government bonds are ultimately a contract about the future, and politics has a direct influence on that future.
“Elections matter for bond markets because they shape fiscal policy, inflation risks and the credibility of the institutions investors rely on when pricing long‑dated government debt.”
