The UK's Office for Budget Responsibility warned in its annual report on long-term fiscal sustainability published on the 7th that unless the government implements additional tax rises or spending cuts equivalent to the annual education budget by the early 2030s, government debt will spiral upwards from current levels. The report shows that under virtually all scenarios, government debt becomes unsustainable and follows a permanently rising path, citing population ageing and surging healthcare spending as the main drivers. It notes that even if the current Labour government's existing plans are fully implemented, the long-term rise in debt cannot be halted, and that a future administration under Andy Burnham, the former Mayor of Manchester who is widely expected to become the next prime minister, would have very little room for spending increases. The Office for Budget Responsibility estimates that to keep the public debt-to-GDP ratio around the current 95 percent, the government would need to improve the primary fiscal balance by 3.8 percent of GDP in the 2031-32 fiscal year and sustain that improvement thereafter, which is 33 percent more than the single-year austerity planned over the next five years and equivalent to total corporation tax receipts or education spending in that year. The Treasury responded by saying the government's economic plan has the backing of the International Monetary Fund.