The Accounting Equation and Introduction to Double Entry
TL;DR
The accounting equation, Assets = Liabilities + Capital, is the fundamental rule in accounting. Every business transaction affects at least two accounts, maintaining this equality. Double-entry bookkeeping system records these dual effects using debits and credits.
1. The Mental Model
Think of the accounting equation as a perfectly balanced seesaw: one side (Assets) must always equal the other side (Liabilities + Capital). Every financial action your business takes is like putting weight on or taking weight off this seesaw, but you must always do it in a way that keeps it perfectly balanced.
2. The Core Material
Understanding the Accounting Equation

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The accounting equation is the bedrock of accounting. It shows the relationship between what a business owns, what it owes to others, and what it owes to its owner(s).
Assets = Liabilities + Capital
Let's break down each part:
- Assets: These are things the business owns that have future economic value. Think of them as resources controlled by the business.
- Examples: Cash, inventory (goods for sale), buildings, machinery, vehicles, money owed by customers (receivables).
- Liabilities: These are what the business owes to external parties. They represent claims against the business's assets.
- Examples: Loans from banks, money owed to suppliers (payables), unearned revenue (money received for services not yet delivered).
- Capital (or Owner's Equity): This is the owner's investment in the business, plus any accumulated profits, minus any drawings. It represents the owner's claim on the assets.
- Examples: Owner's initial investment, retained earnings (profits kept in the business).
The equation always must balance. If you change one side, you have to change the other side, or change two things on the same side, to maintain equality.
Introduction to Double Entry
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