🎓 Prepared by students from Boğaziçi University

What Is Double-Entry Bookkeeping?

Double-entry bookkeeping is the accounting method where every transaction is recorded in at least two accounts — a debit in one and a matching credit in another. This keeps the accounting equation (Assets = Liabilities + Equity) always in balance.

Short answer

Double-entry bookkeeping records every transaction twice — as a debit in one account and an equal credit in another — so total debits always equal total credits.

Debit vs. Credit Effects
Debit (left side)
  • Increases assets
  • Increases expenses
  • Decreases liabilities
  • Decreases equity
Credit (right side)
  • Increases liabilities
  • Increases equity
  • Increases revenue
  • Decreases assets
01

Step-by-step worked examples

A business buys $5,000 of equipment with cash. Record the double entry.

Debit Equipment $5,000 (asset increases)
Credit Cash $5,000 (asset decreases)
Total debits = total credits = $5,000

A company takes a $20,000 bank loan, deposited into its checking account.

Debit Cash $20,000 (asset increases)
Credit Loans Payable $20,000 (liability increases)
Both sides recorded, equation stays balanced

A shop sells $1,200 of goods for cash.

Debit Cash $1,200 (asset increases)
Credit Sales Revenue $1,200 (equity increases via revenue)
Debits = Credits = $1,200
02

Flashcards

03

Quick quiz

Q1.In double-entry bookkeeping, every transaction affects how many accounts?

Correct answer: B. Every transaction has a debit and a matching credit — at least two accounts.

Q2.A debit to Cash means cash…

Correct answer: B. Cash is an asset; debits increase asset accounts.

Q3.If total debits are $10,000, total credits should be…

Correct answer: C. Debits must always equal credits in a balanced entry.

Q4.Which is a credit-increasing account?

Correct answer: C. Revenue increases with a credit; assets increase with a debit.
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04

Common mistakes

Thinking 'debit' always means a decrease.Correct: Debit means the left side of an entry — it increases assets/expenses but decreases liabilities/equity.

Recording a transaction in only one account.Correct: Every transaction needs at least one debit and one matching credit.

Assuming debits and credits refer to good/bad money.Correct: They're just accounting positions (left/right), not judgments about the transaction.

Forgetting that revenue is a credit-side account.Correct: Revenue increases equity and is recorded as a credit, like liabilities and equity.

05

FAQ

What is double-entry bookkeeping?

An accounting method where every transaction is recorded as a debit in one account and an equal, offsetting credit in another.

What is the double-entry bookkeeping rule?

Total debits must always equal total credits, keeping Assets = Liabilities + Equity in balance.

Can you give a double-entry bookkeeping example?

Buying $5,000 equipment with cash: debit Equipment $5,000, credit Cash $5,000.

Why do businesses use double-entry bookkeeping?

It catches errors automatically (debits ≠ credits signals a mistake) and gives a complete financial picture.

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