Use the links below to access TRAC guidance documents for previous years.
Access TRAC guidance version 2.6 (for 2020-21 returns)
Access TRAC guidance version 2.5 (for 2019-20 returns)
Access TRAC guidance version 2.4 (for 2018-19 returns)
Access TRAC guidance version 2.3 (for 2017-18 returns)
TRAC guidance documents for years prior to this are available from The National Archives: