On July 23, 2025, HM Treasury published its Public Expenditure Statistical Analyses (PESA) for 2025. ukpublicspending.co.uk uses the PESA tables of public spending at the "sub-function" level as its major data source for UK public spending.

ukpublicspending.co.uk has now updated its spending tables using data from PESA 2025. The update includes outturn spending data for 2023-24, and plans data for 2024-25. ukpublicspending.co.uk uses PESA's Table 6.4 for Central Government expenditure, Table 7.4 for Local Authority expenditure, and Table 8.3 for Public Corporation capital expenditure.

Since HM Treasury does not provide plans estimates for future Local Authority spending, ukpublicspending.co.uk provides "guesstimates" instead. This is done by extending the percentage increase in spending between 2023-24 and 2024-25 for each sub-function for the plans year. It is assumed that local authority spending reductions will not carry through to plans years.

Country and Region spending has been updated up to 2023-24. These are obtained from Chapters 9 and 10 in the PESA document.