Chancellor John Healey faces a challenging Autumn Budget on 28 October 2026, as inflation, borrowing costs, and the Iran war strain fiscal plans, with think tanks warning of potential tax rises or spending cuts to meet fiscal rules.
Fiscal Challenges and Borrowing Pressures
The Institute for Fiscal Studies (IFS) warns that a steady-as-she-goes
Budget—maintaining current tax and spending plans—would allow inflation to erode departmental budgets, potentially leading to “chunky cuts” in public services. IFS director Helen Miller stated, Choosing to stay the course with the inherited tax and spending plans would mean allowing inflation to blow departments’ spending plans off course.
The IFS now predicts the headroom could shrink to £20 billion by 2029-30, with the think tank warning that a choice to leave spending totals unchanged would implicitly be a choice to cut some budgets.
This uncertainty has prompted the IFS to caution that the OBR’s updated forecast, due alongside the Budget, may differ significantly from previous projections.
Tax Reforms and Investor Concerns
Investors are bracing for potential tax changes, with speculation about higher capital gains tax (CGT) rates and inheritance tax (IHT) adjustments. There is speculation that Healey could increase capital gains tax (CGT) rates. The High Value Council tax surcharge (“mansion tax”) taking effect in April 2028 applies to residential property in England worth £2 million or more in 2026; there are rumours the threshold could be reduced to £1.5m. Meanwhile, tax-free cash withdrawals surged to £22bn on 2025 Budget rumours, raising concerns about premature withdrawals ahead of potential reforms.
The IFS also cautioned that higher inflation could reduce the generosity of departmental budgets.
The government has ruled out increases in main income tax, National Insurance, or VAT. The IFS warned that even “chunky” CGT changes would be unlikely to generate the tens of billions required. Meanwhile, Andy Burnham has announced plans to adjust the triple lock guarantee from April 2030 so state pensions will increase by the highest of 2.5%, inflation or.
Global Conflicts and Economic Uncertainty
The Iran war has intensified economic pressures, with the IFS linking higher energy prices and global conflict to elevated inflation. The think tank warned that the war’s ripple effects could force the government to confront a £35 billion fiscal gap, combining rearmament costs and inflation-driven borrowing.
The US-Israel war against Iran and Russia’s invasion of Ukraine have driven up energy prices, with bond markets pushing US yields to their highest since 2002. The IFS thinks recent turbulence on bond markets and higher inflation will add around £10bn to forecasts for the government’s borrowing costs in 2029-30.
Corporate and Business Implications
For businesses, the Budget’s focus on corporate tax and regulatory changes could reshape strategies. The government has committed under its Modern Industrial Strategy
to reduce administrative burdens by 25%. Corporation tax is also meant to remain capped at 25%.
Unresolved Pressures and Next Steps
With the Budget date set, the government faces a tight balancing act between fiscal discipline and economic growth. The OBR’s updated forecast, due alongside the Budget, will provide clarity on borrowing projections, but uncertainty remains. The IFS warned that a choice to leave spending totals unchanged would implicitly be a choice to cut some budgets.
Healey must decide how to address inflation, borrowing costs, and global conflicts without triggering deep public service cuts or excessive tax rises. The coming weeks will see heightened scrutiny of pre-Budget speculation, with investors and businesses awaiting concrete signals on tax policy, fiscal rules, and the government’s long-term economic strategy. The chancellor’s ability to balance these pressures will determine whether the Budget delivers stability or further uncertainty for households and firms alike.
