The Associates / Number of 51% Companies input screen is located under Tax return information > CT600 > Associates in the Data Navigator.
Enter the Number of 51% companies b/fwd in the first period or use the Number of 51% companies b/fwd.
Select the Tick if Nil box if the number of 51% Companies brought forward are nil.
Enter the number of New 51% companies in the accounting period.
Enter the number of 51% Companies companies no longer associated this period.
Select the Full tax rate only check box if the full rate of Corporation Tax applies to all profits.