This guidance note is written from the perspective of companies only. For information on the AIA as available to unincorporated businesses, see the Annual investment allowance (AIA) guidance note.

Amount of the allowance

An 'annual investment allowance' (AIA) is available for expenditure incurred on plant or machinery on or after 1 April 2008. The maximum amount of AIA available has varied significantly over recent years and the relevant amounts are as follows:

  • £200,000 for expenditure incurred from 1 January 2016
  • £500,000 for expenditure incurred from 1 April 2014
  • £250,000 for expenditure incurred from 1 January 2013
  • £25,000 for expenditure incurred from 1 April 2012
  • £100,000 for expenditure incurred from 1 April 2010
  • £50,000 for expenditure incurred from 1 April 2008

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