The Budget Responsibility Act 2024 inserts a new duty into the Budget Responsibility and National Audit Act 2011 requiring the Treasury to ask the Office for Budget Responsibility (OBR) to prepare a section 4(3) report before a Minister announces any "fiscally significant" measure (or combinations of measures). If the Treasury does not request a report and the OBR judges a measure to be fiscally significant, the OBR must notify the Commons Treasury Committee and prepare a costing of the measure.
The bill defines "fiscally significant" by reference to a threshold expressed as a percentage of GDP and delegates specification of that threshold (and related definitions and procedures) to the Charter for Budget Responsibility. The Act protects temporary emergency measures from the pre-announcement requirement and requires publication of proposed Charter modifications at least 28 days before they are laid before Parliament, while leaving commencement dates to Treasury regulations.
At a Glance
What It Does
The Act requires the Treasury to request an OBR section 4(3) report before a Minister makes a fiscal announcement that meets a GDP-based "fiscally significant" threshold; if the Treasury fails to request and the OBR identifies significance, the OBR must notify the Treasury Committee and produce a costing. The Charter for Budget Responsibility will set thresholds, request procedures and related definitions.
Who It Affects
The Treasury and ministerial departments that propose fiscal measures; the Office for Budget Responsibility, which must prepare additional pre-announcement reports; and the House of Commons Treasury Committee, which receives mandatory notifications in cases where the Treasury did not commission a report.
Why It Matters
The Act formalises a pre-announcement fiscal-scrutiny step for large measures and gives the OBR a statutory backstop to ensure costings reach parliamentary scrutiny. For officials and advisers, it creates new operational sequencing and potential timing constraints around fiscal announcements.
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What This Bill Actually Does
The Act adds a new section (4A) to the Budget Responsibility and National Audit Act 2011 that targets the announcement process for fiscal measures. Before a Minister announces any measure that is "fiscally significant"—or any combination of measures that together cross the threshold—the Treasury must request the OBR to prepare a section 4(3) report.
A section 4(3) report, by reference, contains forecasts and an assessment of the measure's fiscal impact. The procedural hook is simple: no request, no compliant announcement for significant measures.
The bill does not leave the threshold or technical terms in the statute. Instead it defines "fiscally significant" in principle—costing over a specified percentage of GDP for a specified period—and delegates the concrete numbers and many procedural details to the Charter for Budget Responsibility.
The Charter will therefore carry the operational definitions and the procedure for how a request is made; the Act requires that any Treasury proposal to modify the Charter to implement this section be published in draft at least 28 days before the revised Charter is laid before Parliament.The Act also builds a statutory backstop if the Treasury fails to request a costing. If the OBR, on its own view, considers a measure (alone or in combination with others) fiscally significant and it was not requested, the OBR must notify the House of Commons Treasury Committee and prepare a costing report as soon as reasonably practicable.
That notification requirement routes the issue directly into parliamentary scrutiny even where the executive did not trigger the formal request mechanism.Practical mechanics are left to secondary instruments: the Secretary to the Treasury will set commencement dates by statutory instrument (and may stagger them), and the Charter can supplement the section with definitions and procedures. The Act expressly excludes temporary emergency measures from the pre-announcement request and OBR backstop obligations, but does not elaborate "temporary" or "emergency," leaving their contours to the Charter and administrative practice.
The Five Things You Need to Know
The Treasury must request an OBR section 4(3) report before a Minister announces any measure (or combination of measures) that meets the Act’s "fiscally significant" threshold.
If the Treasury does not request a report and the OBR itself judges a measure to be fiscally significant, the OBR must notify the House of Commons Treasury Committee and prepare a costing as soon as reasonably practicable.
"Fiscally significant" is defined by reference to a costing that exceeds a specified percentage of GDP for a specified period; those specifics are set in or by the Charter for Budget Responsibility.
Temporary measures enacted in response to an emergency are exempted from both the pre-announcement request duty and the OBR’s backstop notification and costing obligations.
The Treasury must publish any draft Charter provisions that would implement this section at least 28 days before laying the modified Charter before Parliament; commencement dates are to be appointed by Treasury regulations.
Section-by-Section Breakdown
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Amendments to OBR's main duty to reference new section
These clauses make a narrow but important textual change to the 2011 Act: subsection (2) of section 4 is edited to insert an express reference to duties imposed on the Office and to add the new section 4A to the list of duties. Practically, this ties the new pre-announcement responsibilities into the OBR’s existing statutory remit rather than creating a standalone regime.
Treasury must commission OBR reports before fiscal announcements
This is the core operational rule: when a Minister proposes a fiscal announcement involving a measure (or combination) that is fiscally significant, the Treasury must ask the OBR to prepare a section 4(3) report before the announcement. The provision creates a mandatory sequencing obligation that can affect timing and the internal approvals process for departments and ministerial announcements.
OBR backstop: notification and costing if Treasury fails to request
If the Treasury does not request a report but the OBR judges the measure to be fiscally significant, the OBR must notify the Commons Treasury Committee and prepare a costing report. That gives the OBR an affirmative role to escalate uncommissioned-but-significant measures into parliamentary scrutiny; it is not framed as a sanction but as a transparency mechanism.
Definition of fiscal significance and Charter's role
The Act defines fiscal significance by reference to a costing threshold expressed as a percentage of GDP and delegates the concrete terms to the Charter for Budget Responsibility. The Charter can supplement the section—including procedural and definitional detail—and the Treasury must publish any proposed Charter amendment implementing this provision at least 28 days before laying the modified Charter. This delegates key operational detail to a non-primary instrument while adding a short publication buffer.
Exemptions, definitions and scope
The statute exempts temporary measures responding to emergencies from the request and backstop duties and supplies definitional cross-references (for example, ‘‘fiscal announcement’’ and ‘‘Minister of the Crown’’). It clarifies that combinations of measures count irrespective of whether they are announced together, which broadens the scope of aggregation for threshold calculations.
Extent, commencement and short title
The Act applies across England and Wales, Scotland and Northern Ireland. Section 1 comes into force on days appointed by the Treasury via statutory instrument (with the possibility of different dates for different purposes), and the Act may be cited as the Budget Responsibility Act 2024. Putting commencement to regulation gives the Treasury flexibility on sequencing implementation.
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Explore Finance in Codify Search →Who Benefits and Who Bears the Cost
Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- Office for Budget Responsibility — gains a formal and earlier role in assessing large fiscal measures and a statutory backstop to ensure its costings reach parliamentary scrutiny.
- House of Commons Treasury Committee — receives mandatory notifications when the Treasury fails to commission OBR costings, improving parliamentary sight of significant uncosted measures.
- Parliamentarians and parliamentary scrutiny bodies — benefit from a clearer pathway to independent costings for large fiscal measures, supporting informed debate and oversight.
- Financial markets and analysts — should get more predictable, independent costings for materially large fiscal changes, reducing short-term uncertainty around major announcements.
Who Bears the Cost
- The Treasury — must introduce new pre-announcement sequencing and may face operational delays and political friction when seeking OBR reports, plus responsibility for drafting Charter modifications and publishing drafts.
- Office for Budget Responsibility — faces increased workload and potential need for extra resources or quicker turnarounds to meet pre-announcement requests and ad hoc backstop costings.
- Ministerial departments and policy teams — will need to plan announcement timing around OBR processes and may need to change internal workflows to accommodate mandatory commission steps.
- Government communications and campaign units — lose some flexibility on the timing of major fiscal announcements and must coordinate with Treasury and OBR timetables.
Key Issues
The Core Tension
The Act balances two legitimate goals—independent, pre-announcement fiscal scrutiny for large measures versus the executive’s need for confidentiality, speed and political discretion in announcing policy—but does so by delegating crucial details to the Charter and by relying on the OBR’s escalation rather than on enforceable deadlines, leaving unresolved how to reconcile transparency with practical governance and how to prevent threshold-setting from being used to avoid scrutiny.
The Act puts critical operational detail into the Charter for Budget Responsibility rather than the primary statute: the GDP percentage, the specified period, the mechanics of making a request, and meanings for terms such as "temporary" and "emergency" will be set outside primary legislation. That preserves parliamentary flexibility but hands substantial policy-shaping power to the Charter process, raising questions about how precisely and transparently those thresholds will be set and amended.
The requirement that the OBR notify the Treasury Committee if the Treasury fails to commission a required report strengthens parliamentary visibility but is not a formal enforcement mechanism; the statute does not create sanctions for non-compliance nor timelines for the Treasury to respond. The practical effect will depend on the OBR’s resourcing and willingness to escalate, and on parliamentary appetite to act on such notifications.
Finally, the aggregation rule that allows combinations of measures announced at different times to count toward the threshold creates complexity for departments trying to determine ex ante whether a proposal triggers the duty, potentially generating disputes about how to attribute measures and when the duty arises.
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