This section of the law, called ‘Evidential requirements’, was part of the rules about tax credits and other credits in the Income Tax Act 2007. However, it has been removed from the law. The government decided to take it out on 1 April 2017. This means that this particular rule no longer applies, and you don’t need to follow it anymore. If you want to know more about why this change was made, you can look at section 158 of another law called the Taxation (Annual Rates for 2016–17, Closely Held Companies, and Remedial Matters) Act 2017.