Chancellor Rachel Reeves is facing questions from MPs on the Budget.
Appearing alongside senior civil servants, Reeves expressed her “frustration” at leaks in the run-up to the event and the accidental release of the UK’s fiscal watchdog’s forecasts.
The chancellor called the Financial Times’ pre-Budget revelation that she had abandoned plans to raise income tax rates “incredibly damaging and frustrating”.
Reeves is also expected to be asked about the potential for future tax rises.
The committee of MPs said it planned to examine the tax and spending plans in the Budget, and their implications for “the economy, public services and government debt”.
The Budget included a heavily backloaded set of tax rises, as well as spending restraint intended to come into effect at the end of the parliament.
The MPs also questioned Reeves on the build-up to the Budget, including whether the chancellor was misleading in her warnings of fiscal challenges ahead of the event.
Surveys of consumer spending and retail sales published this week both blamed uncertainty surrounding the Budget for economic weakness in November.
The Office for Budget Responsibility’s role has also come under scrutiny, after it accidentally published its market-sensitive Budget forecasts early.