HM Treasury

The numbers tell that story plainly.

The tax burden is heading to 38 percent of GDP by 2029/30, the highest level since records began in 1948. Under the Conservatives it reached the highest since 1948. Under Labour it has risen further to an all time record. Government spending sits at 44 to 45 percent of GDP, the longest sustained period at that level since the Second World War. Public debt stands at 95 percent of GDP, nearly triple the 32.4 percent recorded in 1999/2000, and now twice the average level across advanced economies. The UK has moved from the 21st largest debt burden among 37 advanced economies at the start of the century to the 5th highest. Debt interest payments have risen from £39 billion (1.7 percent of GDP) in 2019/20 to £106 billion (3.6 percent of GDP) in 2024/25. UK government 10 year bond yields are now the highest in the G7.

Taxes are at record levels. Spending is at record levels. Debt is at record levels. Debt interest is at record levels. Yet the country continues to debate how to fund hospitals, schools, local government, defence and infrastructure. The Treasury has become highly effective at collecting money. It has been considerably less effective at generating the growth needed to ease the pressure.

The productivity failure is the core of the problem. Annual productivity growth averaged 2.1 percent between 1998 and 2007. It fell to 0.6 percent between 2010 and 2019 and to 0.4 percent between 2020 and 2024. The UK experienced the largest fall in productivity growth of any G7 nation. If productivity had kept growing at its earlier pace, GDP per capita would have been approximately £15,000 higher in 2024. That is not an abstract number. It represents higher wages, stronger tax revenues, better funded public services and a smaller deficit, none of which materialised. The United States has seen a partial recovery in its productivity growth since the pandemic. Britain has not.

The Treasury cannot be blamed for every economic difficulty. The financial crisis, the pandemic and global energy shocks all created genuine pressures. What deserves scrutiny is how the institution responded. Again and again the Treasury chose short term financial restraint over long term investment. Maintenance was delayed. Capital projects were postponed. Local government settlements were squeezed. Spending reductions delivered immediate savings while storing up larger costs for the future. Government investment fell below 2 percent of GDP in almost every year from 1980/81 until the late 2010s. The current government has raised it above 2 percent and plans to sustain it there for the rest of the decade, the first time since the 1970s. Whether that reversal holds through future fiscal pressures remains to be seen.

The result of decades of underinvestment is visible across the country. Roads require extensive repairs. Court backlogs remain substantial. Local authorities have reduced services. Public sector buildings face growing maintenance liabilities. NHS waiting lists reached record levels. Schools face structural maintenance crises. Britain increasingly resembles a country that has spent years managing decline rather than preparing for renewal.

The revolving door at the top has not helped. Nine Chancellors served between 1997 and 2024. Six served between 2016 and 2024 alone, and none of them remained at the Treasury for three years. Only Gordon Brown and George Osborne lasted long enough to see their own fiscal plans through. Each Chancellor set medium term targets for reducing borrowing, and each set of targets was subsequently pushed back due to further shocks, weak growth or decisions to loosen fiscal policy in the short term. Plans to reduce borrowing and stabilise debt have been a common feature of every forecast since the pandemic. None has yet materialised in the final numbers.

The Treasury has also relied increasingly on measures that are less visible than outright tax rises. Frozen thresholds, reduced allowances and a growing burden of stealth taxation have increased revenues while allowing politicians to avoid explicit debates about the tax system. The public notices the result even when it rarely sees the mechanism. More money leaves household budgets while public services continue to struggle. Tax policy decisions at the November 2025 Budget alone were forecast to raise £26.6 billion by 2030/31.

The Treasury's greatest strength remains its ability to prevent immediate financial crises. Its greatest weakness is that crisis prevention has increasingly become its primary purpose. For years the institution has focused on keeping the system stable. Stability matters. It is not the same thing as progress. The public will judge the Treasury not by whether it balanced the books for another year, but by whether Britain became wealthier, more productive and more prosperous under its stewardship. Productivity growth of 0.4 percent, a tax burden at a post war record, debt at 95 percent of GDP and debt interest of £106 billion a year tell a story that is far less convincing than the institution's reputation suggests.