UK debt interest costs surge, threatening fiscal space ahead of Budget

Figures released by the Office for Budget Responsibility indicate that interest payments on the United Kingdom’s near-£3 trillion debt will exceed the borrowing required to close the fiscal gap in the coming year. The interest expense is expected to rise from £109 billion in 2025/26 to £117 billion in 2027/28, overtaking the projected public-sector net borrowing of £96.5 billion for that period. Analysts note that the UK is the first G7 nation to see borrowing costs breach 6 percent since the euro-zone crisis, a trend that could be amplified by the Middle-East conflict and lingering inflation pressures.

Capital Economics and Oxford Economics predict the five-year interest bill could reach £682 billion, roughly £58 billion above the OBR’s earlier estimate. This escalation threatens the Chancellor’s ability to meet fiscal rules without cutting spending or raising taxes, as the fiscal “headroom” has already halved to around £12 billion. The Treasury maintains that fiscal discipline underpins economic stability and national security, and asserts that the government will stay within its fiscal framework.