問題：Wayne is a sole trader.
　　Until what date must he retain his self assessment records for the 2012/13 tax year?
　　A. Until 5 April 2014
　　B. Until 31 January 2019
　　C. Until 5 April 2018
　　D. Until 31 January 2015
　　答案：The correct answer is: Until 31 January 2019.
　　Individuals must usually retain their records for 1 year from the submission deadline. However, where the individual is a sole trader, partner or has a supplementary source of income such as property income or gains, the records must be kept for 5 years.