Unemployment in the UK has unexpectedly risen to 5% while wage growth has slowed, according to official figures, in the first snapshot of how companies are reacting to the impact of the Iran war.

The Office for National Statistics (ONS) said the rate of unemployment was up in the three months to March, from 4.9% in February, a rate that City economists had expected to hold.

More up-to-date tax data showed the number of payrolled employees dropped sharply in April, falling by 100,000, after a 28,000 decline in March, the ONS said.

Excluding bonuses, wage growth was 3.4% year on year in the three months to March, down from 3.6% in February. While this was what economists had been expecting, it was still the slowest growth since the three months to October 2020. After taking inflation into account, wages grew by just 0.3%.

Including bonuses, wages increased by 4.1%, from a rise of 3.8% in the previous quarter.

The Iran war began on 28 February, making this the first full month of official data to show how employers responded to rising energy costs, as global oil and gas prices have risen sharply due to the effective closure of the strait of Hormuz.

The emerging picture of how the UK economy has been faring since the start of the Middle East conflict has been mixed. Surveys have suggested consumers are fearful of rising inflation and are cutting back on discretionary spending, while businesses have reported sharp rises in input costs. However, figures from the ONS released last week showed the UK economy grew by 0.3% in March and by 0.6% over the first quarter.

This unexpectedly high GDP figure caused the International Monetary Fund to increase its UK growth forecast for 2026 on Monday, from 0.8% to 1% in 2026, to reflect the UK’s “strong prewar momentum” and a robust performance in the first quarter of the year.

However, the Bank of England expects unemployment to hit 5.1% by the middle of this year and then rise to between 5.5% and 5.6% by the summer of 2027 based on current estimates of how the Iran war might affect the UK economy.