Purchase Day book (Purchase Register)is the book of original entry in which all the transactions relating to only credit purchase are recorded. Cash purchases do not find place in purchase day book as they are recorded in Cash book. At the end of every month purchase day book is totalled. The total amount show the total goods purchased on credit. The total of purchase book is debited to the purchase account and the accounts of the suppliers of goods are credited with the amount standing against their names. Ruling of purchase day book is different from a journal. There are five columns in a purchase day book: first column records Date, second column records name of the supplier, quantity supplied, Rate at which quantity supplied, description, etc. , third column records Invoice number, fourth column records Ledger Folio, fifth column records total amount to the supplier.