Author Description

This document sets out the assumptions and methodologies underlying costings for tax and Annually Managed Expenditure (AME) policy decisions announced since Autumn Statement 2011, where those policies have a greater than negligible impact on public finances. The costing for the change from 50% to 45% additional rate of income tax can be found in the HMRC's additional rate evaluation document (ISBN 9780108511516). This sets out considerable detail on the additional rate, including estimates of forestalling, other behavioural responses and the steady state yield. Chapter 2, presents detailed information on the key data and assumptions underpinning the costing policies in the 2012 Budget. Each note sets out the description of the measure, the base, the methodology for the costing and highlights any areas of additional uncertainty. Annex A sets out the indexation assumptions included on the public finances forecast baseline, including all pre-announcements