Difference between Trade and Cash Discount

Following are the important special purpose subsidiary books :
(i) Cash Book: Only cash transactions are recorded in this book. In double column cash book, we record cash transactions as well as transactions related to the bank. In such a case Cash account and Bank account is not prepared separately because both the columns are involved in the cash book. A separate Cash Book is maintained for payment of small/petty expenses.
(ii) Purchases Book : Only credit purchases of goods and materials (required for the purpose of production) are recorded in the purchases book.
(iii) Sales Book: Only credit sales of goods are recorded in this book.
(iv) Purchase Returns Book : Goods returned to suppliers are recorded in this book. It is also called 'Returns outward book.'
(v) Sale Returns Book: Goods returned by customers are recorded in this book. It is also called 'Returns inward book'.
(vi) Bills Receivable Book : Bills drawn and accepted by debtors and promissory notes received from them are recorded in this book.
(vii) Bills Payable Book: Bills accepted by the firm and promissory notes issued to creditors are recorded in this book.
(viii) Journal Proper: The business transaction, which cannot be recorded in any of the seven books, mentioned above are recorded in this book. It is also called 'Miscellaneous Journal'.

Some subsidiary books are :
(i) Cash Book
(ii) Purchases Journal or Purchases Book
(iii) Sales Journal or Sales Book
(iv) Purchases Returns Journal or Purchases Returns Book
(v) Sales Returns Journal or Sales Returns Book
(vi) Purchases Book
(vii) Bills Receivable Book
(viii) Bills Payable Book.