Sunak declined to commit specifically to tax rises, saying any decision would need to wait for his annual budget statement due early next year.
The headline measure of public debt will begin to fall as a share of GDP from 2024/25, but a lower, underlying measure of debt - which excludes temporary lending by the Bank of England - is forecast to keep rising.
Record-low interest rates made the high level of debt affordable, and spending on debt interest is due to fall to a record low share of public spending, despite the surge in borrowing, the OBR forecast.
But Britain was becoming more vulnerable to any unexpected rise in global interest rates, it warned.
“If those change significantly over time and move up, that would cost us more money and that’s something that would obviously be difficult,” Sunak told radio station LBC.
Rishi Sunak, that’s, ” Sunak, Sunak, ”, Andrew Bailey
BBC, . Bank of England, Britain’s, Bank of England, LBC