Guidance

Developing proportionate business cases

Guidance on the proportionate application of the business case guidance.

• From: HM Treasury
• Published: 28 October 2026

Documents

Proportionality: Guidance for business cases

PDF, 186 KB, 17 pages

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Details

The Green Book and the accompanying business case guidance should be applied proportionately to the scale, cost, complexity and risk of a proposal. This document sets out guidelines and practical advice on applying a proportionate approach to the development and presentation of business cases for projects and programmes. 

This guidance should be read alongside the guidance on developing business cases.