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Double-Entry Bookkeeping: Principles, Accounting Equation & Business Documents (ACCA K1)

Published September 8, 2022 Updated September 27, 2026 by Eduyush Team

Basics of Accounting · ACCA K1 / FA Syllabus Topic

Double-Entry Bookkeeping: Principles, the Accounting Equation and Business Documents (With Examples)

Every transaction has two sides. This guide explains debits and credits, the accounting equation, the documents that start every entry, and how a computerised system records it all — mapped to the ACCA K1 Financial Accounting learning outcomes.

By Vicky Sarin, CA · Founder, Eduyush · Updated September 2026 · 12 min read

The short answer: double-entry bookkeeping records every transaction in two accounts — at least one debit and at least one credit of equal value — so the books always balance. It rests on the accounting equation: Assets = Capital + Liabilities. Debits increase assets, expenses and drawings; credits increase liabilities, capital and income. Transactions start from business documents such as invoices, credit notes and receipts, and in a computerised system the software posts both sides automatically. This topic is the first learning outcome in the ACCA K1 Financial Accounting syllabus area “The use of double-entry bookkeeping and accounting systems”.

Your situation at a glance

You are…	Start with
New to accounting (B.Com, BBA, CA Foundation, small business owner)	Debit and credit rules, then the accounting equation worked example
Studying ACCA FA now	This is FA syllabus area C1 — every section below is examinable, especially business documents and transaction types
Planning to sit ACCA K1 from July 2027	All of the above, plus the stronger computerised accounting framing — data sources and system features are explicit K1 outcomes
Revising for an exam	Jump to the practice questions at the end

What is double-entry bookkeeping?

Double-entry bookkeeping is the system of recording each transaction twice: once as a debit (Dr) in one account and once as a credit (Cr) in another, for the same amount. It is also called the dual aspect or duality concept, because every transaction has two effects on a business.

For example, if a business buys a delivery van for $20,000 and pays from its bank account:

Debit Motor vehicles (non-current asset) $20,000 — an asset increases
Credit Bank $20,000 — another asset decreases

Because total debits always equal total credits, adding up all the account balances in a trial balance should show equal debit and credit totals — a basic arithmetic check on the records.

Debit and credit rules

A simple way to remember the rules is DEAD CLIC: Debits increase Expenses, Assets and Drawings; Credits increase Liabilities, Income and Capital.

Account type	A debit will…	A credit will…	Normal balance
Asset	Increase it	Decrease it	Debit
Expense	Increase it	Decrease it	Debit
Drawings	Increase it	Decrease it	Debit
Liability	Decrease it	Increase it	Credit
Income	Decrease it	Increase it	Credit
Capital	Decrease it	Increase it	Credit

The accounting equation

Double entry works because it keeps the accounting equation in balance after every transaction:

Assets = Capital + Liabilities

which can also be written as Assets − Liabilities = Capital (net assets equal the owner's interest). Capital itself changes over time, so the expanded form is:

Assets = Opening capital + Capital introduced + Profit − Drawings + Liabilities

Worked example: applying the accounting equation

Priya starts a trading business. Watch how every transaction changes two items and the equation still balances.

Transaction	Effect	Assets ($)	Capital ($)	Liabilities ($)
1. Priya pays $10,000 into a business bank account	Bank +10,000; Capital +10,000	10,000	10,000	0
2. Buys inventory on credit for $3,000	Inventory +3,000; Payables +3,000	13,000	10,000	3,000
3. Sells goods costing $1,200 for $2,000 cash	Bank +2,000; Inventory −1,200; Profit +800	13,800	10,800	3,000
4. Pays the supplier $1,000	Bank −1,000; Payables −1,000	12,800	10,800	2,000
5. Priya withdraws $500 for personal use	Bank −500; Drawings reduce capital by 500	12,300	10,300	2,000

After every step, Assets = Capital + Liabilities: $12,300 = $10,300 + $2,000. Closing capital is opening capital $10,000 + profit $800 − drawings $500 = $10,300.

Main types of business transactions and their double entries

The K1 and FA syllabuses focus on sales and purchases (including returns) and receipts and payments. Here are the standard entries:

Transaction	Debit	Credit	Source document
Cash sale	Bank / Cash	Sales	Receipt / till record
Credit sale	Trade receivables	Sales	Sales invoice
Sales return (customer returns goods)	Sales returns	Trade receivables	Credit note issued
Cash purchase	Purchases	Bank / Cash	Receipt from supplier
Credit purchase	Purchases	Trade payables	Supplier invoice
Purchase return (goods sent back to supplier)	Trade payables	Purchase returns	Credit note received
Receipt from a credit customer	Bank	Trade receivables	Remittance advice / bank statement
Payment to a credit supplier	Trade payables	Bank	Remittance advice / payment record
Payment of an expense (e.g. rent)	Rent expense	Bank	Invoice / bank statement

Where sales tax (VAT or GST) applies, the tax element is split out — for a credit sale, the receivable is debited with the gross amount, sales is credited with the net amount and the sales tax payable account is credited with the tax.

Example: recording a credit sale and a return

A business sells goods on credit to Client A for $550 (no sales tax). Client A later returns goods worth $50 and then pays the balance.

Sale: Dr Trade receivables $550 / Cr Sales $550
Return: Dr Sales returns $50 / Cr Trade receivables $50
Payment: Dr Bank $500 / Cr Trade receivables $500

Client A's receivable balance is now nil ($550 − $50 − $500).

Business documents: purpose and contents

Every entry starts with a document. The diagram shows how documents flow between a customer and a supplier in a typical credit transaction — only some of them trigger an entry in the books.

Document	Issued by → to	Purpose and key contents	Recorded in the books?
Purchase order	Customer → supplier	Formal request to buy: items, quantities, agreed prices, delivery date, PO number	No — no transaction yet
Sales order	Supplier (internal)	Confirms the customer's order internally so goods can be picked and sent	No
Goods despatched note (GDN)	Supplier → customer	Sent with the goods: items and quantities despatched; customer often signs a copy	No — but used to raise the invoice
Goods received note (GRN)	Customer (internal)	Records goods actually received and their condition; matched to the PO and invoice	No — but needed before the invoice is approved
Sales invoice / supplier invoice	Supplier → customer	Demand for payment: invoice number, date, items, prices, sales tax, total, credit terms	Yes — sale for the seller, purchase for the buyer
Debit note	Customer → supplier	Requests a credit, e.g. for returned or faulty goods or an overcharge	Usually no — the entry follows the supplier's credit note
Credit note	Supplier → customer	Reduces the amount owed for returns, discounts or errors	Yes — sales return / purchase return
Statement of account / supplier statement	Supplier → customer	Lists invoices, credit notes and payments for the period, and the balance owed	No — used to reconcile balances
Remittance advice	Customer → supplier	Sent with a payment to show which invoices it settles	The payment it accompanies is recorded
Receipt	Supplier → customer	Confirms payment received: date, amount, payer	Yes — evidence for cash received / paid

Computerised accounting systems

Main data sources

In a computerised accounting system, data enters from several sources:

Source documents keyed or scanned in — sales and purchase invoices, credit notes and receipts, often captured by scanning and automated text recognition.
Bank feeds and bank statement imports — receipts and payments flow in directly from the bank.
Integrated or linked systems — point-of-sale tills, e-commerce platforms, inventory and payroll modules that pass transactions to the accounting system.
Electronic invoicing — invoices exchanged digitally between customer and supplier systems.
Manual journals — entered by accountants for adjustments such as accruals, depreciation and error corrections.

Key features of a computerised accounting system

Automatic double entry: one input (e.g. a sales invoice) posts both the debit and credit — so debits always equal credits.
Integrated ledgers: sales, purchases, cash, inventory and payroll update the general ledger in real time.
Instant reports: trial balance, aged receivables and payables, and financial statements at the click of a button.
Validation controls: checks such as account codes, date ranges and duplicate invoice numbers reduce input errors.
Audit trail: every entry is logged with user, date and time.
Access controls: passwords and user permissions restrict who can post or approve.
Automation: recurring entries, bank reconciliation matching and period-end routines.

The Eduyush take: a computerised system guarantees the books balance, not that they are right. Posting an invoice to the wrong customer, the wrong expense code or the wrong period still produces a perfectly balanced trial balance. That is why the K1 syllabus pairs system features with error types and reconciliations — and why examiners love questions where the trial balance agrees but the accounts are still wrong. Understanding the manual double entry is what lets you spot those errors.

Where this fits in ACCA K1 and FA

In the redesigned ACCA Qualification, K1 Financial Accounting replaces FA from July 2027. This article covers the first sub-area of the K1 syllabus section “The use of double-entry bookkeeping and accounting systems” — 1. Double-entry bookkeeping principles, including the maintenance of accounting records:

K1 learning outcome	Level	Covered in
(a) Explain the main data sources in a computerised accounting system	[K]	Main data sources
(b) Explain the main types of business transactions: sales and purchases (including returns); receipts and payments	[K]	Types of transactions
(c) Explain the purpose and contents of business documentation: orders, GDNs and GRNs, invoices, statements, credit and debit notes, remittance advice and receipts	[K]	Business documents
(d) Explain and apply the accounting equation	[S]	Accounting equation
(e) Summarise the key features of a computerised accounting system	[K]	Key features

[K] means a knowledge-level outcome (explain, summarise); [S] means a skill you must be able to apply — so expect numerical accounting-equation questions, not just definitions. The same content sits in the current FA syllabus under area C, and an FA pass earns full K1 credit at transition.

Now → mid-July 2027 — FA remains available on-demand; this topic is examined under FA area C.

July 2027 — K1 on-demand exams begin, with the computerised-systems framing built into this topic.

September 2027 — full transition; FA passes convert to K1 credit.

A brief history of double entry

Double-entry bookkeeping developed among Italian merchants in the 13th and 14th centuries. It was first described in print by the Franciscan friar and mathematician Luca Pacioli in Summa de arithmetica, geometria, proportioni et proportionalita, published in Venice in 1494. His section on bookkeeping set out the “Venetian method” — journals, ledgers and the rule that debits must equal credits — which spread across Europe and remains the basis of accounting today.

Practice questions (K1 / FA style)

1. A business buys goods on credit for $800. What is the double entry?

Debit Purchases $800, Credit Trade payables $800.

2. Which document does a customer send to a supplier to request a reduction for faulty goods?

A debit note. The supplier then issues a credit note, which is the document recorded in the books.

3. Opening capital is $40,000, profit for the year is $15,000 and drawings are $5,000. Liabilities are $12,000. What are total assets?

Closing capital = $40,000 + $15,000 − $5,000 = $50,000. Assets = Capital + Liabilities = $50,000 + $12,000 = $62,000.

4. A customer returns goods originally sold on credit for $120. What is the entry?

Debit Sales returns $120, Credit Trade receivables $120.

5. Which document is matched to the purchase order and supplier invoice before the invoice is approved for payment?

The goods received note (GRN), which confirms the goods were actually received.

Double-entry bookkeeping FAQs

What is double-entry bookkeeping?

Double-entry bookkeeping records every transaction in at least two accounts — a debit and a credit of equal value — so that total debits always equal total credits. It is based on the accounting equation: Assets = Capital + Liabilities.

What are the rules of debit and credit?

Debits increase assets, expenses and drawings; credits increase liabilities, income and capital. The reverse entry decreases each account. A common memory aid is DEAD CLIC.

What is the accounting equation?

Assets = Capital + Liabilities (or Assets − Liabilities = Capital). Every transaction changes at least two items so the equation stays in balance. Capital increases with capital introduced and profit, and decreases with drawings.

What is the difference between a credit note and a debit note?

A credit note is issued by a supplier to reduce the amount a customer owes, for example after goods are returned. A debit note is sent by the customer to the supplier to request that credit. The credit note is the document normally recorded in the books.

What is the difference between a GDN and a GRN?

A goods despatched note is prepared by the supplier and sent with the goods. A goods received note is prepared by the customer when the goods arrive, recording what was actually received and its condition.

What are the main data sources in a computerised accounting system?

Source documents such as invoices, credit notes and receipts (keyed or scanned), bank feeds and statement imports, linked systems such as point-of-sale, e-commerce and payroll, electronic invoices, and manual journals for adjustments.

Is double entry in the ACCA K1 syllabus?

Yes. It is the first sub-area of the K1 Financial Accounting section on the use of double-entry bookkeeping and accounting systems, covering data sources, transaction types, business documents, the accounting equation and computerised system features. The same content is examined in FA until mid-July 2027.

Keep learning: see the full K1 Financial Accounting syllabus guide and the Knowledge Level (K1–K3) overview. For more fundamentals, read what is a trial balance, the purpose of accounting and the materiality concept.

Preparing for ACCA FA or K1? Get BPP study texts and revision kits for Financial Accounting from Eduyush, an ACCA Registered Learning Partner — FA passes earn full K1 credit.

Shop FA study materials · Practise the CBE format