Double entry and the auditable enterprise
Keep accounts a stranger can check.
Everything for this step
- Field guide
- Calculating by hand → 4 sections Institutions: what to found, and how to run them → 32 sections
- Builds
- None yet.
- Reference sheets
- None.
- Sciences it rests on
- Mathematics
- Track
- Money, credit and capital, level 3 of 5 · next: Fungible token and the mint
Why this matters
A single-column account records what happened and is trusted exactly as far as its keeper. Double entry — every transaction written twice, as a source and a use — does something a single column cannot: it makes the books self-checking. If the two sides do not agree, something is wrong, and that is visible to anyone, including someone with no knowledge of the business and no relationship with the person keeping it. That property is what allows an enterprise to be larger than the people who can be personally vouched for. Every organisation on this ladder above a workshop — the mill, the factory, the bank, the public works fund — depends on it, and none of them is possible while the accounts can only be believed.
The shape of it
- Every entry twice: where the value came from and where it went. The totals must agree. That agreement is the whole mechanism — not a formality, and not an accounting convention.
- Bind the books and number the pages. Loose or renumberable pages make removal invisible; the binding is a security measure.
- Never erase. Correct with a further entry that leaves the error visible. An erasure is indistinguishable from a concealment, so the rule removes the ambiguity rather than the mistake.
- Separate the person who handles goods or money from the person who records them. This single division prevents most theft, because it requires two people to agree rather than one to decide.
- Balance on a fixed cycle and have someone else check it. A balance checked only by its author checks nothing.
- Keep the unit of account fixed — see units. Accounts kept in a drifting measure cannot be compared across years, which is most of what accounts are for.
Doing it, step by step
The summary above says what has to happen. This says how, with the numbers that decide whether it works.
1 · Set up bound books with numbered pages
Two books, bound, with every page numbered before use, written in ink:
- The journal — every transaction in date order, as it happens.
- The ledger — one page or section per account, to which each journal entry is posted.
Loose or renumberable pages make removal invisible; the binding is a security measure, not tidiness. Keep supporting documents — receipts, tallies, delivery notes — numbered and filed against the journal entries.
2 · Write a chart of accounts
List and number every account before the first entry, in five groups:
- Assets — cash, grain and stores, tools, buildings, money owed to the enterprise.
- Liabilities — money and goods the enterprise owes.
- Capital — what the owners or the settlement put in.
- Income — sales, fees, rents.
- Expenses — wages, materials, fuel, repairs.
Keep the unit of account fixed — see units. Accounts kept in a drifting measure cannot be compared across years.
3 · Enter every transaction twice
Every transaction is written as a debit to one account and an equal credit to another — where the value went, and where it came from.
Examples: buying fuel for 20 units of grain paid from stores — debit fuel expense 20, credit grain stores 20. Selling flour on credit for 50 — debit money owed to us 50, credit sales 50.
Total debits must always equal total credits. That agreement is the whole mechanism: if the two sides do not agree, something is wrong, and it is visible to anyone.
4 · Never erase — correct with a further entry
An erasure is indistinguishable from a concealment, so the rule removes the ambiguity rather than the mistake.
- A slip spotted immediately: one straight line through it, still readable, initialled and dated, with the correct figure beside it.
- An error found later: a reversing entry that undoes it, then a correct entry, each explained.
No scraping, no ink over the top, no torn pages.
5 · Separate holding from recording
The person who handles goods or money does not keep the books for them. This single division prevents most theft, because it requires two people to agree rather than one to decide.
Where there are enough people, split three ways: one person authorises a payment, a second holds the goods or cash, a third records it. Rotate the roles periodically, and require two signatures for anything above a stated size.
6 · Balance every month, and count the stock
At a fixed interval — monthly — total every ledger account and prepare a trial balance: the list of balances, debits and credits totalling the same.
Then count the physical goods and cash and compare the count with what the books say. A difference is a finding — theft, waste, spoilage or a recording error — and it is investigated and recorded, not quietly adjusted away. A balance checked only by its author checks nothing; a second person does it.
7 · Audit from outside, and test the audit
At least yearly, someone unconnected with the enterprise audits: traces a sample of entries back to their supporting documents, follows a sample of documents forward into the books, counts stock and cash, and checks the trial balance.
Test the auditor from time to time with a deliberately planted error. The test of the whole system: a stranger, given only the books, can state the enterprise's position and find the planted error. See credit and the bank.