Answer
The sales day book (sales journal) records credit sales only, listed from sales invoices—date, customer name, invoice number, and amount (net, VAT, gross). Cash sales are not recorded here; they go in the cash book. Periodically the totals are posted: the total to the sales account and VAT account, and individual amounts to customers' accounts in the sales ledger.
Sales Day Book (extract):
Date Customer Inv Net VAT Total
3/5 A Ltd 101 1,000 200 1,200
Totals posted: Dr Debtors control; Cr Sales 1,000, VAT 200Real-world example Only invoiced credit sales appear in the sales day book; a walk-in cash sale is entered in the cash book instead.