The Purpose of Accounting and Source Documents

What you'll learn

This topic forms the foundation of CIE IGCSE Accounting, covering why businesses keep financial records and the documents that provide evidence for transactions. You'll examine the key purposes of accounting systems, the characteristics that make accounting information useful, and the range of source documents that accountants use to record business activities accurately. Exam questions frequently test your ability to identify appropriate documents for specific transactions and explain how accounting serves different stakeholder needs.

Key terms and definitions

Accounting — the process of recording, classifying, summarizing and presenting financial information in a systematic manner to aid decision-making.

Source documents — original business documents that provide written evidence that a transaction has occurred, forming the basis for all accounting entries.

Stewardship — the responsibility of management to safeguard and properly manage the resources entrusted to them by the business owners.

Stakeholders — individuals or groups who have an interest in the financial performance and position of a business (e.g., owners, managers, employees, creditors, tax authorities).

Invoice — a document sent by the seller to the buyer showing details of goods sold or services provided, quantities, prices, and total amount due.

Credit note — a document issued by the seller to the buyer showing a reduction in the amount owed, usually due to returned goods or overcharging.

Receipt — a document acknowledging that money has been received, showing the date, amount, and purpose of payment.

Debit note — a document sent by the buyer to the seller requesting a reduction in the amount owed, or by the seller to indicate an additional amount due.

Core concepts

The purposes of accounting

Accounting serves several essential functions for businesses of all sizes, and CIE IGCSE Accounting exam questions regularly require you to explain these purposes:

Recording transactions systematically Every business transaction must be recorded accurately to maintain a complete financial history. This systematic recording ensures no transaction is overlooked and provides an audit trail that can be verified. The double-entry bookkeeping system used in CIE IGCSE Accounting ensures that every transaction is recorded twice, maintaining the accounting equation.

Calculating profit or loss One primary purpose is determining whether a business has made a profit or loss during a specific period. The Statement of Profit or Loss (formerly called the Profit and Loss Account) calculates this by comparing revenue earned against expenses incurred. This information is crucial for assessing business performance and making strategic decisions.

Showing financial position The Statement of Financial Position (Balance Sheet) presents a snapshot of what a business owns (assets) and owes (liabilities) at a specific date, alongside the capital invested by the owner. This statement helps stakeholders understand the business's financial health and stability.

Providing information for decision-making Accounting information enables informed business decisions. Managers use financial data to decide whether to expand operations, purchase new equipment, adjust prices, or control costs. Without accurate accounting records, these decisions would be based on guesswork rather than evidence.

Exercising stewardship Owners who employ managers to run their business need assurance that resources are being used properly. Accounting records demonstrate how management has safeguarded and utilized the business's assets, fulfilling their stewardship responsibility.

Meeting legal requirements Businesses must maintain accounting records to comply with tax legislation and company law. HM Revenue & Customs (HMRC) requires accurate records to calculate tax liabilities. Limited companies must file accounts with Companies House, making them publicly available.

Comparing performance Accounting enables businesses to compare:

• Performance across different time periods (trend analysis)
• Actual results against budgeted figures (variance analysis)
• Their performance against competitors (inter-firm comparison)

Characteristics of useful accounting information

CIE IGCSE Accounting questions may ask you to explain what makes accounting information valuable to stakeholders. The key characteristics are:

Relevance Information must be applicable to the decision being made. For example, a bank considering a loan application needs information about assets, liabilities, and cash flow, rather than detailed expense breakdowns.

Reliability Accounting information should be accurate, unbiased, and verifiable. Source documents provide this reliability by offering objective evidence of transactions.

Comparability Users need to compare information across different periods or businesses. Consistent accounting policies and standardized presentation formats enable meaningful comparisons.

Understandability Financial information should be presented clearly so that users with reasonable business knowledge can comprehend it. This is why statements follow standardized formats.

Timeliness Information must be available when needed for decisions. Delayed financial statements lose value because business conditions change rapidly.

Source documents in detail

Every accounting entry originates from a source document. CIE IGCSE Accounting exam questions frequently test your knowledge of which document is appropriate for specific transactions.

Purchase invoice Received from suppliers when a business buys goods or services on credit. Contains:

• Supplier's name and address
• Customer's (buyer's) name and address
• Invoice number and date
• Description and quantity of goods/services
• Unit prices and total amount
• Terms of trade (e.g., trade discount, settlement discount)
• VAT amount (if applicable)

The buyer uses this to record purchases and credit payables (accounts payable).

Sales invoice Sent to customers when the business sells goods or services on credit. The format mirrors the purchase invoice but from the seller's perspective. The seller uses this to record sales and debit receivables (accounts receivable).

Credit note issued Sent by the seller to the buyer to reduce the amount owed. Common reasons include:

• Goods returned by the customer (damaged, wrong specification)
• Overcharging on the original invoice
• Allowances granted for damaged goods the customer keeps

The credit note is recorded in the Sales Returns Day Book and reduces receivables.

Credit note received Received from suppliers when returning goods or when overcharged. Recorded in the Purchases Returns Day Book and reduces payables.

Debit note sent Issued by the buyer to inform the supplier that their account is being debited (amount owed is being reduced). Often sent when returning goods, before receiving the credit note from the supplier.

Debit note received Received from suppliers indicating an additional amount is owed, perhaps for undercharging or additional delivery costs.

Receipt Proof that payment has been received. Shows:

• Date of payment
• Amount received
• Method of payment (cash, cheque, bank transfer)
• What the payment was for
• Signature of the person receiving payment

Issued when the business receives money from customers or other sources.

Cheque counterfoil The stub remaining in the cheque book after writing a cheque. Records:

• Date
• Payee (who the cheque is paid to)
• Amount
• Purpose of payment

Provides evidence of payments made by the business.

Paying-in slip counterfoil The stub retained when depositing money into the bank. Shows:

• Date
• Amounts of cash and cheques deposited
• Total deposited

Provides evidence of money banked.

Bank statement Issued by the bank, showing:

• Opening balance
• All deposits (credits)
• All withdrawals and payments (debits)
• Closing balance

Used to verify cash book entries and prepare bank reconciliation statements.

Petty cash voucher Internal document supporting small cash payments. Includes:

• Date
• Amount paid
• Purpose of payment
• Signature of recipient and authorizer

Used to record petty cash expenses and maintain control over small payments.

Matching transactions to source documents

Understanding which document supports each transaction type is essential for CIE IGCSE Accounting:

Worked examples

Example 1: Identifying appropriate source documents (4 marks)

State which source document would be used for each of the following transactions:

(a) James Trading returned damaged goods to ABC Suppliers (b) Sarah received $450 from a credit customer (c) The business paid $35 for stationery from petty cash (d) Goods worth $1,200 were sold on credit to Khan Enterprises

Answer: (a) Debit note (sent to ABC Suppliers) or Credit note (received from ABC Suppliers) — 1 mark (b) Receipt (issued to the customer) — 1 mark (c) Petty cash voucher — 1 mark (d) Sales invoice (sent to Khan Enterprises) — 1 mark

Example 2: Explaining the purposes of accounting (6 marks)

Explain three purposes of accounting for a small retail business.

Answer: Calculate profit or loss — The business needs to determine whether trading activities have been profitable by comparing sales revenue with expenses incurred. This shows the owner whether the business is viable and meeting financial objectives. (2 marks)

Provide information for decision-making — Accounting records enable the owner to make informed decisions such as whether to increase stock levels, adjust selling prices, or control specific expenses based on actual financial performance rather than estimates. (2 marks)

Meet legal requirements — The business must maintain accurate records to calculate the correct amount of tax owed to HM Revenue & Customs and to comply with tax legislation requiring proper documentation of income and expenses. (2 marks)

Mark scheme note: Award 1 mark for identifying each purpose and 1 mark for developing the explanation in the context of the business.

Example 3: Source document analysis (8 marks)

Ahmed runs a wholesale business. During March, the following transactions occurred:

• 5 March: Sold goods on credit to Retail Store Ltd for $2,400
• 12 March: Retail Store Ltd returned goods worth $300 as they were damaged
• 18 March: Ahmed purchased inventory from Best Suppliers on credit for $1,800
• 25 March: Paid Best Suppliers in full by cheque
• 28 March: Received a cheque from Retail Store Ltd for the balance owed

Required: (a) Identify the source document for each transaction (5 marks) (b) Explain why source documents are important in accounting (3 marks)

Answer: (a)

• 5 March: Sales invoice sent to Retail Store Ltd — 1 mark
• 12 March: Credit note issued to Retail Store Ltd — 1 mark
• 18 March: Purchase invoice received from Best Suppliers — 1 mark
• 25 March: Cheque counterfoil — 1 mark
• 28 March: Receipt issued to Retail Store Ltd — 1 mark

(b) Source documents provide objective evidence that transactions have occurred, ensuring accounting records are reliable and verifiable. They support entries in the accounting books and can be used to resolve disputes about transactions. They also create an audit trail that allows internal and external auditors to verify the accuracy of financial statements. (3 marks for three developed points)

Common mistakes and how to avoid them

• Confusing invoices with receipts — Students often think an invoice proves payment has been made. An invoice is a request for payment showing amounts owed; a receipt confirms payment has been received. Remember: invoice = "please pay", receipt = "payment received".

• Mixing up credit notes and debit notes — Credit notes reduce the amount owed by the buyer (used for returns or overcharging), while debit notes are sent by buyers to request this reduction. Focus on the direction: credit notes go from seller to buyer to reduce debt; debit notes go from buyer to seller to inform them of a pending reduction.

• Listing only one purpose of accounting — When exam questions ask for purposes (plural), provide multiple distinct purposes. Don't just rewrite the same purpose in different words. "Recording transactions" and "providing information" are different purposes, while "calculating profit" and "determining net profit" are essentially the same.

• Forgetting the cheque counterfoil — Students remember that cheques are source documents but forget that the business retains the counterfoil (stub) as the actual source document for recording payments made. The cheque itself goes to the payee.

• Not providing context in explanations — When explaining why accounting information is useful, generic answers score low marks. Always relate your explanation to specific users (managers, owners, tax authorities) and specific decisions they make using that information.

• Confusing stewardship with ownership — Stewardship refers to managers safeguarding resources on behalf of owners, not the owners themselves managing their own business. This distinction matters when explaining how accounting serves different stakeholder groups.

Exam technique for The Purpose of Accounting and Source Documents

• Command word "state" or "identify" — These require brief, factual answers. When identifying source documents, the document name alone is sufficient (e.g., "Purchase invoice"). Don't waste time explaining unless asked. Typically worth 1 mark per correct identification.

• Command word "explain" — Requires you to make a point and then develop it with reasoning or context. Structure: state the purpose/characteristic + say why it matters/how it works. For example: "Accounting calculates profit or loss [point] by comparing revenue with expenses, which shows whether the business is financially successful [development]." Each explanation usually earns 2 marks.

• Matching exercises — Source document questions often involve matching transactions to documents. Read each transaction carefully to identify whether goods are moving in or out, whether payment has occurred, and whether credit is involved. Systematically work through each transaction rather than jumping around.

• Multi-part questions — Questions about purposes of accounting typically appear as "Explain three purposes" (6 marks). Ensure each purpose is genuinely different. Good combinations: calculate profit, provide decision-making information, and meet legal requirements. Poor combinations: calculate profit, determine financial success, and show business performance (all too similar).

Quick revision summary

Accounting systematically records, classifies, and presents financial information to calculate profit/loss, show financial position, support decision-making, demonstrate stewardship, meet legal requirements, and enable performance comparisons. Useful accounting information must be relevant, reliable, comparable, understandable, and timely. Source documents provide written evidence of transactions: purchase invoices (goods bought on credit), sales invoices (goods sold on credit), credit notes (reducing amounts owed), debit notes (requesting reductions), receipts (confirming payment received), cheque counterfoils (recording payments made), bank statements (verifying cash book), and petty cash vouchers (supporting small payments). Each transaction requires the appropriate source document to ensure reliable accounting records.