Office for Budget Responsibility Forecasts

Mel Stride Excerpts

Monday 1st December 2025 Commons Chamber

[Sir Mel Stride (Central Devon) (Con)]

I begin with the matter of the report on the OBR leak. We will of course study that report in detail, but as the right hon. Gentleman concluded by saying, “We will respond to this matter with the seriousness it demands”, I seek immediate reassurance that this will not include scapegoating the OBR to distract from the serious questions surrounding the handling of the Budget by the Chancellor, Ministers, the Treasury and No. 10.

Let me turn to the other matters that the Chief Secretary to the Treasury addressed in his statement. We expect those in positions of power to act with transparency, openness and integrity, but it is increasingly clear that, in recent weeks, the conduct of people in Government fell short of those standards. That is not just my view; indeed, a member of the Cabinet is quoted in today’s press as saying:

“The handling of this Budget has been a disaster from start to finish.”

The impression has been given that there was a concerted attempt to paint an inaccurate picture of the public finances, designed to give political cover for policy decisions around increases in taxes and welfare spending. On 4 November, the Chancellor delivered a pre-Budget statement in Downing Street, in which she said that the OBR would be downgrading its productivity forecasts, meaning lower tax receipts. The Chancellor herself says that the statement was meant to set the context relating to the public finances and the need take difficult decisions on tax, but—this is the key point that the right hon. Gentleman did not address—she failed to mention that the net result, in the OBR’s review of the economy, was that there was an increase in tax revenues, not a black hole. To quote the OBR’s Budget report:

“In isolation, the reduction in productivity growth could have lowered revenues by around £16 billion… However, the boost to receipts from higher inflation and changes to the composition of nominal GDP growth…more than offset this.”

The Chief Secretary to the Treasury argues that there was a need to increase headroom, but that was not the justification for tax rises that was given before the Budget—although it is effectively an admission that the decision to leave such a small amount of headroom in the previous two fiscal events was irresponsible. The Chief Secretary to the Treasury’s argument fails to acknowledge that a significant proportion of the increase in taxes was used to fund policy decisions on spending, specifically on welfare.

On 14 November, the media were briefed that income tax rates would not be increased, following the improved forecast from the OBR. We now know that that was simply false. As I pointed out in my letter to the OBR before the Budget, the finalised pre-measures forecast came weeks before that, on 31 October. Even after the Budget, in a Guardian interview, the Chancellor said that income tax rises had remained on the table well into November

“because we didn’t know the size of the downgrade, the productivity”.

That is not true.

Since then, on Friday, the OBR took the unprecedented step of publishing its estimates for headroom in each of its pre-measures forecast rounds. As a result, we now know that at no point was there a deficit on the scale suggested to the media. Why did the Chancellor claim that she did not know the size of the headroom forecast by the OBR in November, when its final forecast was submitted on 31 October? At what point were the Cabinet informed that the forecast still showed a surplus, and why did the Chancellor suggest that the OBR’s review of the economy had led to a significant deterioration in the public finances?

We now know that the briefings to the press were not just inappropriate but inaccurate. Those briefings can only have come from inside Government. Will the Chief Secretary to the Treasury finally give us a clear answer: was the Chancellor aware of those briefings, and did she authorise them—yes or no? Will he commit to a full investigation by both the permanent secretary and the Financial Conduct Authority into those briefings, and will he explain why the Chancellor chose to opine repeatedly on the OBR’s forecasts before the Budget, when those forecasts were provided to her in strictest confidence?

The Chief Secretary to the Prime Minister claimed this morning that the OBR’s publication on Friday was simply responding to a request from the Select Committee, but the OBR’s report on Wednesday said that it had already planned to write that letter. Will the Chief Secretary to the Treasury confirm that it was, in fact, a proactive choice by the OBR to publish that information, which clearly suggests that the OBR was concerned that the record of who knew what, when, would otherwise be less than clear? It is a matter of profound regret that although the Chancellor chose to appear before the media yesterday, she did not see fit to appear here today. Her credibility is in tatters, and to the long list of her failings in respect of these matters should be added that of disrespecting this House.

[James Murray]

I was unclear from what the shadow Chancellor said at the beginning of his comments whether he, like us, values the role of the OBR in the Budget-setting process. We value its independence and we value its integrity. That is why we take what happened last Wednesday with the utmost seriousness, and we are determined to pursue it.

The shadow Chancellor went on to make a series of points, which I will address, but he fails to acknowledge that the productivity downgrade was real. The £16 billion hit to the forecast as a result of the productivity downgrade was real. I wonder why he does not want to acknowledge that. Could it be because the productivity downgrade was the result of things that his Government did over the 14 years that they were in office? Could it be the fact that the productivity downgrade was the result of a review by the OBR of policies including cuts to public investment, the mishandling of Brexit, and the record of the previous Government? That is perhaps why he does not want to acknowledge that point. The productivity downgrade by £16 billion was real. The need to build headroom was crucial. Both were principles that guided the Chancellor going into the Budget, as was the importance of cutting the cost of living, cutting NHS waiting lists, and cutting Government borrowing.

The shadow Chancellor will remember from when he was in government under the Conservatives that the process involving the OBR and the Treasury is an iterative one that runs until Budget day. When the Chancellor delivered her Budget, the “Economic and fiscal outlook”, which, as we have discussed, was published slightly early, set out the context for the decisions that she took. The shadow Chancellor raised the issue of information security. I am sure that he will have received the letter from the permanent secretary sent on 25 November, which stated:

“As Permanent Secretary, I place the utmost weight on Budget security. I will continue to keep all aspects under review to ensure the integrity of the Budget process.”

Finally, the shadow Chancellor asked where the Chancellor is today. I am very pleased to tell the House that the Chancellor has been at the Wales investment summit today, following the announcement yesterday of £1.4 billion of extra investment into Wales—just the latest in £16 billion of new investments announced since the summit was launched.