The chart of accounts is the list of buckets your transactions get sorted into. It is the single decision that determines whether your financial reports tell you anything useful, and most small businesses never touch it — they accept whatever their software created on day one and live with the consequences.
It is worth twenty minutes of thought. Here is what it is, how much detail is useful, and a structure you can start from.
The five account types
Every account you will ever create is one of five types. Assets are things you own: bank accounts, money customers owe you, equipment, inventory. Liabilities are what you owe: credit cards, loans, sales tax collected but not yet remitted, payroll withheld but not yet paid. Equity is the owner's stake — money you put in, money you took out, and accumulated profit.
The other two show up on the profit and loss statement. Income is what you earn. Expenses are what it costs to earn it, often split into cost of goods sold (costs that scale directly with what you sell — materials, subcontractors, merchant fees) and operating expenses (costs you carry regardless — rent, insurance, software, marketing).
The first three types make up your balance sheet and carry forward forever. The last two reset to zero at the start of each fiscal year and roll into equity. That distinction explains a lot of otherwise confusing bookkeeping rules: it is why an owner draw and a loan principal payment never appear on your P&L, and why neither one is a deduction.
How much detail is useful
The test for whether an account deserves to exist is simple: would you make a different decision if you could see that number by itself? Advertising as a single line is probably not enough if you spend meaningfully on two channels and want to know which one is working. Fourteen separate insurance accounts are almost certainly too many, because nobody is going to act on that breakdown.
Too few accounts and your P&L says nothing — a giant general expenses line tells you money left, not where it went. Too many and a different failure occurs: similar transactions get coded inconsistently from month to month, the trend lines stop meaning anything, and nobody trusts the report. Fifty to eighty accounts covers most small service businesses comfortably.
When you want to slice the same expenses a second way — by location, by crew, by property, by service line — do not build parallel sets of accounts for it. Use the classes, departments, or tags your software provides. One account structure cut several ways stays consistent; duplicated account trees never do.
A starting structure
The conventional numbering scheme groups accounts by type, which keeps reports in a sensible order and leaves room to add: 1000s for assets, 2000s for liabilities, 3000s for equity, 4000s for income, 5000s for cost of goods sold, and 6000s and up for operating expenses. Leave gaps — number in tens, not ones — so a new account can be inserted where it belongs rather than tacked onto the end.
A workable starting set for a small service business: checking and savings, accounts receivable, and any equipment you own in the 1000s; credit cards, sales tax payable, payroll liabilities, and loans in the 2000s; owner contributions, owner draws, and retained earnings in the 3000s; one income account per genuinely different revenue stream in the 4000s; materials and subcontractors in the 5000s; and in the 6000s rent, insurance, vehicle and fuel, software and subscriptions, advertising, professional fees, bank and merchant fees, office supplies, repairs and maintenance, dues and licenses, and payroll.
Two accounts worth adding deliberately: one for owner draws kept well away from any payroll account, since those are the transactions most often miscoded, and one clearly labeled holding account for transactions you genuinely cannot categorize — with a standing rule that it gets emptied before every close.
Changing it without wrecking your history
The cost of restructuring is comparability. Split one account into three in July and your year-over-year comparison stops working for that line, because the earlier periods were never coded that way. Where possible, make structural changes at the start of a fiscal year. Where that is not practical, decide up front whether you are going to reclassify the earlier months to match — sometimes worth it, often not.
Never delete an account that has transactions in it. Every serious accounting package lets you mark an account inactive, which hides it from the picker while leaving the history intact. Deleting or merging accounts rewrites reports you may have already filed a tax return on.
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