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October 18, 2026

Source documents and books of original entry

ZIMSEC O Level · Principles of Accounts · Form 3

Source documents

  • Invoice: sent by the seller for credit sales; shows goods, prices and trade discount.
  • Credit note: sent by the seller when goods are returned or overcharged.
  • Debit note: sent by the buyer to request a credit note.
  • Receipt: proof of payment received. Cheque counterfoil and bank paying-in slip.
  • Statement of account: summary of transactions with a customer for a month.

Books of original entry

Transactions are first recorded in journals before posting to the ledger:

  • Sales journal (credit sales, from invoices sent).
  • Purchases journal (credit purchases, from invoices received).
  • Sales returns journal (credit notes sent) and purchases returns journal (credit notes received).
  • Cash book (cash and bank transactions).
  • General journal (anything else: opening entries, purchase of non-current assets on credit, corrections).

Discounts

  • Trade discount: a reduction for trade buyers; never recorded in the accounts.
  • Cash discount: for paying promptly; recorded as discount allowed (expense) or discount received (income).
Exam tip: Credit sales of GOODS go to the sales journal; credit purchase of a non-current asset goes to the general journal.

Check yourself

  1. Which document does a seller send when goods are returned?
  2. In which book is the credit purchase of goods first recorded?
  3. Is trade discount entered in the ledger?
Show answers
  1. A credit note.
  2. The purchases journal.
  3. No – only the net amount is recorded.

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