Over the years, the process for delivering capital expenditure in the public sector in the UK has had a pretty bad reputation. The anecdote goes that the first quarter is spent arguing about budgets, in the second everyone goes on holiday, and it is only in the third quarter that programmes finally get up and running, before everything stops for the Christmas break. The final quarter is then a mad rush to spend the remaining budget before the end of the financial year.

Unfortunately, there does appear to be some support for this conjecture when we take a look at the actual numbers.

According to the public sector finance release for December 2024, together with the latest Office for Budget Responsibility forecast for the current financial year to March 2025, public sector gross capital formation (in effect capital expenditure) is lowest in the first quarter, picks up in the second (despite the summer holidays), rises slightly again in the fourth (despite the Christmas break) and then explodes in the fourth quarter of each financial year (despite winter).

Our chart shows capital expenditure in 2022/23 of £85.3bn comprised £14.4bn in Q1 (Apr-Jun), £18.4bn in Q2 (Jul-Sep), £20.2bn in Q3 (Oct-Dec) and £32.3bn in Q4 (Jan-Mar). A similar pattern occurs in 2023/24 when a total £102.7bn of capex was incurred, with £18.6bn in Q1, £22.8bn in Q2, £24.2bn in Q3, and £37.1bn in Q4. Meanwhile in the current 2024/25 financial year, £20.4bn was incurred in Q1, £23.8bn in Q2, and £25.8bn in Q3, with a forecast of £39.0bn in Q4 to reach a forecast total of £109.0bn.

In practice the fourth quarter jump is principally seen in the final month of the financial year, as seen in 2023/24 when fourth quarter capital expenditure of £37.1bn consisted of £9.6bn in January 2024 (£1.0bn more than the monthly average capital expenditure of £8.6bn that financial year), £10.2bn in February 2024 (£1.6bn more than the monthly average), and £17.3bn in March 2024 (£8.7bn more than the monthly average).

This pattern is a stubbornly consistent feature of the public finances in the UK, even after numerous attempts within government to improve capital budgeting and delivery processes. For example, departments are able to carry over some of their capital budgets to future years, which in theory should reduce the incentive to spend every last penny of their allocation in-year. The new spending review process coming into force this summer should also help by setting out a four-year capital budget for 2026/27 to 2029/30, providing much greater forward certainty for investment programmes and (in theory) reducing the concern of future budgets disappearing if the current year budget is not spent in full.

Of course, it is possible that our concerns about the quality of government’s investment delivery process are not fully justified. There could after all be some very good practical reasons as to why March is the best time of the year for carrying out public capital works!