Chart of Accounts 101 for Small Businesses

Every transaction in your books lands in an account, not a bank account, but a category in your chart of accounts (COA). The COA is the taxonomy of your business, and its quality determines whether reports illuminate or confuse.

The five families

• Assets (what you own): bank balances, receivables, equipment.
• Liabilities (what you owe): credit cards, loans, payables, sales tax collected.
• Equity: what's left for the owner after liabilities.
• Income (what you earn): sales, services, other income.
• Expenses (what it costs): rent, software, contractors, and friends.

Small-business rules of thumb

Fewer categories beat more. Twenty well-chosen expense categories produce a readable P&L; eighty produce noise. Split a category only when the split would change a decision: 'Marketing' becomes 'Ads' and 'Content' when you actually manage them separately.

Name for the business, not the textbook. 'Truck fuel' means something to a contractor; 'Vehicle operating expense (variable)' means a form. Your accountant can map your names to tax lines later; you have to read these weekly.

Mirror tax categories where it's free. If a category will land on a Schedule C line anyway (advertising, insurance, legal services), naming it that way makes year-end mechanical.

Maintenance is near zero

A good COA changes rarely: add a category when a genuinely new kind of money appears, archive ones that never get used. What keeps books clean isn't COA sophistication; it's transactions landing in the right category consistently, which is what categorization rules automate. Start with a sensible default set, adjust twice a year, and spend your attention on the reports instead.