Chancellor John Healey’s first Autumn Budget on 28 October 2026 is being shaped by constrained fiscal headroom after higher inflation and elevated gilt yields widened borrowing costs, leaving limited room to meet spending ambitions without breaching self-imposed rules on day-to-day outlays and debt-to-GDP. The government remains bound by manifesto pledges against rises in income tax, employee National Insurance, and VAT, directing attention toward capital gains tax tweaks, potential bank levies, corporation tax stability at 25 percent, and targeted measures such as the “Your First Home” equity-loan scheme for first-time buyers. Recent Institute for Fiscal Studies analysis highlights a roughly £35 billion gap if defence spending is to reach 3 percent of GDP by 2030 while protecting other departments, underscoring the trade-offs between tax design, benefit reforms, and public-service pressures ahead of the Office for Budget Responsibility forecast.