Why markets are paying close attention to political and economic uncertainty

Government borrowing costs have risen sharply in recent weeks as investors react to growing uncertainty around the future of Prime Minister Keir Starmer and wider economic pressures.

The effective interest rate on 10-year Government borrowing briefly reached 5.13%, close to levels last seen during the 2008 financial crisis. Longer-term borrowing also came under pressure, with the 30-year gilt yield rising to 5.81%, its highest level since 1998.

While financial markets move constantly, these figures highlight how quickly investor sentiment can change when uncertainty increases.

What's driving the increase?

Markets were already unsettled by the conflict involving Iran, which pushed oil prices above $100 per barrel and increased concerns about inflation.

Higher energy prices often feed through into the wider economy, raising costs for businesses and consumers. If inflation rises, investors may begin to expect interest rates to remain higher for longer.

That matters because higher interest rates typically increase borrowing costs throughout the economy.

Why the UK has been affected more than some other countries

Although many countries have faced similar global pressures, the UK's borrowing costs rose more sharply than those seen in economies such as France and Germany.

Analysts suggested that some investors were also concerned about the possibility of changes within the Labour leadership and what that could mean for future Government spending.

There are concerns in some parts of the market that a change in direction could result in higher public spending and increased Government borrowing.

Prime Minister Keir Starmer and Chancellor Rachel Reeves have repeatedly described their fiscal rules as "iron-clad" and have committed to maintaining strict borrowing controls.

However, some Labour MPs have questioned whether the current fiscal framework is suitable for delivering long-term economic renewal.

Understanding gilts

Government borrowing is largely carried out through bonds known as gilts.

Investors effectively lend money to the Government in exchange for interest payments over a fixed period.

As with any investment, the perceived level of risk influences the return investors demand. If confidence falls or uncertainty rises, investors generally require higher returns before committing their money.

That is why borrowing costs can rise even when no immediate policy changes have been announced.

Wider market reaction

The impact was felt beyond the gilt market.

Bank shares and sterling also reacted as investors assessed the possibility of future tax changes and shifts in economic policy under a different political landscape.

However, short-term market movements can be volatile and often reverse quickly.

The more significant point is that investors remain highly sensitive to uncertainty around fiscal policy, Government spending and economic direction.

What does this mean for businesses and households?

For most businesses and households, rising gilt yields are not something that affects day-to-day decisions directly.

However, they can influence the wider economy through:

• Interest rate expectations
• Mortgage pricing
• Business borrowing costs
• Investment confidence
• Government spending decisions

While one day's market movement rarely tells the whole story, periods of uncertainty often remind us how closely financial markets watch Government policy and economic stability.

Final thoughts

The recent rise in UK borrowing costs reflects a combination of global pressures and domestic political uncertainty.

Whether these increases prove temporary or more persistent remains to be seen, but the reaction highlights how quickly markets can respond when confidence is tested.

For businesses, the key takeaway is to continue focusing on the fundamentals: cashflow, profitability and planning ahead for changing economic conditions.

If you'd like to discuss how wider economic developments may affect your business or personal finances, I'm always happy to have a conversation.