Income Statement and Balance Sheet Relationship

This study guide covers fundamental accounting principles, transaction recording, and the relationship between business costs and efficiency.

Business Efficiency and Quality

• Efficiency and Cost of Goods Sold (COGS): Business efficiency decreases when the cost of goods sold rises faster than sales revenue. To combat this, a business must either decrease costs or increase the unit selling price.

• Cost vs. Quality Trade-offs: Reducing costs by seeking cheaper materials can negatively impact quality. For example, using "cheap silver" reduces item quality and can lead to customer liability if users have allergic reactions.

Core Accounting Concepts

• Double-Entry Bookkeeping: Every financial transaction affects at least two accounts to ensure the books remain balanced.

• Account Types:

• Assets: Items that provide a future benefit to the business (e.g., cash, computers/equipment, inventory).

• Liabilities: Debts or obligations the business owes (e.g., credit card balances).

• Equity: The owner's residual interest in the business (e.g., paid-in capital).

• Revenue: Income generated from business activities (e.g., sales).

• Expenses: Costs incurred to generate revenue (e.g., payroll, cost of goods sold, supplies).

Transaction Rules (Debits and Credits)

The left side of an account is a debit, and the right side is a credit.

Account Type

To Increase

To Decrease

Asset

Debit

Credit

Liability

Credit

Debit

Equity

Credit

Debit

Revenue

Credit

Debit

Expense

Debit

Credit

Practical Startup Example

A theoretical startup demonstrates how various transactions impact different journals:

• Initial Investment: $100,000 in cash.

• Debit Cash (Asset) $100,000.

• Credit Paid-in Capital (Equity) $100,000.

• Equipment Purchase: $2,500 computer bought on credit.

• Debit Equipment (Asset) $2,500.

• Credit Credit Card (Liability) $2,500.

• Sales Transaction: Selling a product for $50,000 that cost $25,000 to make.

• Debit Cash (Asset) $50,000.

• Credit Sales (Revenue) $50,000.

• Debit Cost of Goods Sold (Expense) $25,000.

• Credit Inventory (Asset) $25,000.

• Operational Expenses: $12,000 payroll and $2,500 supplies, both paid in cash.

• Debit Payroll/Supplies (Expense).

• Credit Cash (Asset).