If in the case of a company which has been carrying on business, or of a business which has been carried on for less than 5 years, the accounts of the company or business have only been made up in respect of 4 years, 3 years, 2 years or one year, the preceding paragraphs of this Part have effect as if references to 4 years, 3 years, 2 years or one year (as the case may be) were substituted for references to 5 years.