“If the sub-contractor is not a company a sum deducted under section 61 and paid to the Board is to be treated as being income tax paid in respect of the sub-contractor's relevant profits.”
“Any person who may be required … to make and deliver a return for a year of assessment or other period shall … keep all such records as may be requisite for the purpose of enabling him to make and deliver a correct and complete return for the year or period.”