HM Treasury

Invest to save budget (ISB)

Documents and bidding guidance


During the lifetime of a project, from the first expression of interest through to final evaluation, a number of documents are required from you.


The following are examples of good full business cases (in particular areas) from previous rounds.

The following examples use 6% as the discounted figure in their calculations as part of their ecomonic appraisals. Please note that the discounted figure has changed to 3.5% as stated in The Green Book (Appraisal and Evaluation in Central Government).

For further details please check the The Green Book.

The documents on this page are available in Adobe Acrobat Portable Document Format (PDF). These documents will open in a new window. If you do not have Adobe Acrobat installed on your computer you can download the software free of charge from the Adobe website. For alternative ways to read PDF documents and further information on website accessibility visit the HM Treasury accessibility page.

Bidding guidance

Round 9

If you have any further queries, please email the ISB Team at

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