AQA A-Level Accounting (7127)

## Learning Outcomes

- Understand the difference between **source documents** and **books of prime entry**
- Identify the main books of prime entry used in the double entry model
- Match common transactions to the correct source document and first accounting record
- Explain how information moves from source documents to books of prime entry and then to ledger accounts
- Avoid common exam errors, especially with credit goods, cash transactions and the general journal
- Apply the rules to short-answer and multiple-choice exam questions

## AQA A-Level Accounting (7127) Syllabus

For the AQA A-Level Accounting (7127), you are expected to understand how transactions are recorded within the double entry model, with a focus on the following syllabus points:

- Know that transactions are recorded from **source documents** into **books of prime entry** and then into ledger accounts
- Identify common source documents, including invoices, credit notes, receipts, cheque counterfoils, paying-in slip counterfoils and bank statements
- Understand that the **sales journal** records credit sales of goods only
- Understand that the **purchases journal** records credit purchases of goods for resale only
- Explain the difference between **sales returns** and **purchases returns**
- Know that the **cash book** records all cash and bank receipts and payments and also forms part of the double-entry system
- Recognise that the **general journal** is used for non-routine items not recorded elsewhere
- Distinguish between goods transactions, service transactions, cash transactions and non-current asset transactions

## Test Your Knowledge

_Attempt these questions before reading this article. If you find some difficult or cannot remember the answers, look more closely at that area during your revision._

1. What is the difference between a source document and a book of prime entry?
2. Which book of prime entry records a credit sale of goods to a customer?
3. Why does a purchase invoice for equipment not go in the purchases journal?
4. Which source document is commonly linked to goods returned by a customer?
5. Why is a cheque received from a debt previously written off still entered in the cash book?

## Introduction

In the double entry model, the first stage is not the ledger. Before anything is posted to ledger accounts, a transaction is supported by evidence and then summarised in the correct book of prime entry. This is a basic area of AQA Accounting, but it is tested often because students confuse the document with the record, or choose the wrong book for the transaction.

![Transaction recording sequence from source documents to books of prime entry and subsequent posting to ledger accounts within the double entry system.](https://static.pastpaperhero.com/images/aqa-a-level-accounting-7127-the-double-entry-model-source-documents-and-books-of-prime-entry_00.png)

_Accounting records progress from documentary evidence into the appropriate day book or cash book before double-entry posting to the ledger._

This topic matters because correct classification is the base of the whole accounting system. If a transaction goes into the wrong book of prime entry, the later double entry is likely to be wrong as well. In exam questions, the marks often depend on spotting one key rule: whether the transaction is **credit goods**, **cash/bank**, **returns**, or **non-routine**.

> **Key Term: source document**
> The original evidence that a transaction has taken place, used as the basis for making the first accounting entry.
>
> **Exam Warning:**
> Do not rely on keyword recognition alone; check the precise condition, exception, calculation step, or evidence the question requires.

### Source documents: the evidence behind the accounting entry

A business transaction should be supported by documentary evidence. That evidence is the source document. The source document comes first in the accounting process because it proves that the transaction happened.

Common source documents include:

- sales invoice
- purchases invoice
- credit note
- receipt
- till receipt or till roll
- bank paying-in slip counterfoil
- cheque counterfoil
- bank statement
- remittance advice
- petty cash voucher

A sales invoice is prepared by the seller and sent to the customer. For the seller, it provides evidence of a sale. A purchases invoice is the same document from the buyer’s point of view, because it supports the purchase entry.

A credit note is used when there is a reduction in the amount due, often because goods are returned. In many AQA-style questions, the safe rule is:

- goods returned by a customer to us: use a **credit note issued**
- goods returned by us to a supplier: use a **credit note received** or equivalent returns evidence

> **Key Term: invoice**
> A document showing details and value of goods or services supplied, used as evidence of a sale or purchase.

A source document does not itself form part of double entry. It provides the evidence from which the transaction is entered into the accounting records.

A useful way to think about the process is:

1. a transaction happens
2. a source document records the evidence
3. the transaction is summarised in a book of prime entry
4. the double entry is posted to ledger accounts

> **Test Tip:**
> In MCQs, ask yourself two separate questions: “What proves the transaction?” and “Where is it first recorded?” The first answer is the source document; the second is the book of prime entry.
### Books of prime entry: the first accounting record

A book of prime entry is the first place in the accounting system where the transaction is recorded. It is not the evidence itself. It is the accounting summary made from the evidence.

> **Key Term: book of prime entry**
> The first place in which a transaction is recorded in the accounting system, using information taken from source documents.

The main books of prime entry are:

- sales journal
- purchases journal
- sales returns journal
- purchases returns journal
- cash book
- general journal

You may also see alternative names:

- **sales day book** for sales journal
- **purchases day book** for purchases journal
- **returns inwards journal** for sales returns journal
- **returns outwards journal** for purchases returns journal
- **book of original entry** for book of prime entry

The journals list transactions before totals or details are posted to ledger accounts. This reduces the volume of entries passing straight through the ledger and helps divide work in the accounts function.

The key exam rule is that the four main day books are mainly for **credit transactions in goods**. That phrase matters. Students often lose marks because they focus on the word invoice and forget to check whether the transaction is credit, cash, goods, services, or non-current assets.

### The main books of prime entry and what each records

The **sales journal** records **credit sales of goods**. It is compiled from sales invoices issued to customers.

It does not record:

- cash sales
- sales of services
- sale of non-current assets

If a business sells goods on credit to a customer, the sales journal is correct. The later double entry will be:

- debit trade receivable
- credit sales

The **purchases journal** records **credit purchases of goods for resale**. It is compiled from purchases invoices received from suppliers.

It does not record:

- cash purchases
- purchase of services
- purchase of non-current assets

This is one of the biggest student errors. A purchase invoice for office equipment does not go in the purchases journal just because it is a purchase invoice. Office equipment is a non-current asset, not goods for resale.

The **sales returns journal** records **returns inwards**, meaning goods returned by customers. It is commonly compiled from credit notes issued.

The later double entry is:

- debit sales returns
- credit trade receivable

The **purchases returns journal** records **returns outwards**, meaning goods returned to suppliers. It is commonly compiled from credit notes received or equivalent returns evidence.

The later double entry is:

- debit trade payable
- credit purchases returns

The **cash book** records all **cash and bank receipts and payments**. This includes:

- cash sales
- cheque receipts
- bank transfers received
- cheque payments
- bank transfer payments
- cash paid into bank
- cash withdrawn from bank
- information taken from bank statements such as bank charges, direct debits and standing orders

The cash book is unusual because it is both:

- a book of prime entry for cash and bank transactions
- part of the double-entry system itself

That means cash and bank entries are not reposted to separate cash and bank ledger accounts in the usual way, because the cash book already performs that function.

> **Key Term: cash book**
> The book of prime entry for all cash and bank receipts and payments; it also forms part of the ledger.

The **general journal** records non-routine transactions not entered elsewhere. Examples include:

- opening entries
- correction of errors
- some non-current asset transactions on credit
- other adjustments or transfers

But students often overuse the general journal. Routine cash and bank transactions belong in the cash book, even if the transaction itself is unusual.

A good example is a cheque received from a debt previously written off. The background is unusual, but the transaction is still a bank receipt. So the correct book of prime entry is the **cash book**, not the general journal.

> **Test Tip:**
> If money physically moves in or out through cash or bank, the answer is usually the cash book. Do not be distracted by unusual wording.

### Matching transaction, source document and book of prime entry

The safest way to answer exam questions is to classify the transaction by type.

#### Credit sale of goods

- likely source document: sales invoice
- book of prime entry: sales journal

#### Credit purchase of goods for resale

- likely source document: purchases invoice
- book of prime entry: purchases journal

#### Goods returned by customer

- likely source document: credit note issued
- book of prime entry: sales returns journal

#### Goods returned to supplier

- likely source document: credit note received
- book of prime entry: purchases returns journal

#### Cash sale or cheque received

- likely source document: receipt, till roll, paying-in slip counterfoil or bank statement
- book of prime entry: cash book

#### Payment by cheque or bank transfer

- likely source document: cheque counterfoil or bank statement
- book of prime entry: cash book

#### Purchase of non-current asset on credit

- likely source document: invoice
- book of prime entry: general journal

#### Non-routine correction or opening entry

- likely source document: authorised memo, email, letter or internal instruction
- book of prime entry: general journal

A compact rule set:

- **credit + goods sold** = sales journal
- **credit + goods bought for resale** = purchases journal
- **credit returns from customer** = sales returns journal
- **credit returns to supplier** = purchases returns journal
- **cash or bank movement** = cash book
- **non-routine item not fitting elsewhere** = general journal

### Common student errors and how to avoid them

Students often make the following mistakes.

#### Error 1: confusing document and record

They name a sales invoice when asked for the book of prime entry, or write sales journal when asked for the source document.

Fix: always separate evidence from recording.

#### Error 2: putting all purchases invoices into the purchases journal

The purchases journal is only for **credit purchases of goods for resale**. A credit purchase of machinery or office equipment goes elsewhere, usually the general journal.

#### Error 3: putting cash sales into the sales journal

Cash sales go in the cash book because the money is received immediately.

#### Error 4: mixing up returns inwards and returns outwards

- returns inwards = customers return goods to us
- returns outwards = we return goods to suppliers

#### Error 5: using the general journal for routine bank items

A cheque received, bank transfer paid, direct debit, or bank charge belongs in the cash book.

#### Error 6: forgetting that the cash book is part of double entry

Most books of prime entry are summaries that later feed ledger entries. The cash book is different because it is also the ledger account for cash and bank.

A final exam-safe distinction:

| Transaction type                 | Correct first record      |
| -------------------------------- | ------------------------- |
| Credit goods sale                | Sales journal             |
| Credit goods purchase for resale | Purchases journal         |
| Cash or bank movement            | Cash book                 |
| Non-current asset on credit      | General journal           |
| Return from customer             | Sales returns journal     |
| Return to supplier               | Purchases returns journal |

## Key Point Checklist

_This article has covered the following key knowledge points:_

- Source documents are the original evidence that a transaction took place
- Books of prime entry are the first accounting records made from source documents
- The main books of prime entry are the sales journal, purchases journal, sales returns journal, purchases returns journal, cash book and general journal
- The sales journal records credit sales of goods only
- The purchases journal records credit purchases of goods for resale only
- Sales returns means goods returned by customers; purchases returns means goods returned to suppliers
- The cash book records all cash and bank receipts and payments
- The cash book is both a book of prime entry and part of the double-entry system
- Routine cash and bank items do not belong in the general journal
- Non-current asset purchases on credit do not go in the purchases journal just because there is an invoice
- A cheque received for a previously written off irrecoverable debt is still entered in the cash book
- Correct exam answers depend on classifying the transaction by type before choosing the book of prime entry

## Key Terms and Concepts

- source document
- invoice
- book of prime entry
- cash book


The double entry model - Source documents and books of prime entry