Petty cash without the mystery
Petty cash leaks not because the amounts are big but because nobody owns them. The imprest system fixes it in three rules.
1. Fix the float
Pick an amount — say $200 — and that is what the box always notionally holds: cash plus receipts should equal $200 at any moment.
2. Receipt everything
Money leaves only against a receipt in the box. No receipt, no reimbursement — the rule survives only if it has no exceptions.
3. Top up by reconciliation
When cash runs low, total the receipts, post them to their expense accounts, and top the float back to $200. The top-up cheque equals the receipts — that equality is the control.
Small money, disproportionate mess
Petty cash goes wrong not because the amounts are large but because the discipline is informal: a float nobody counts, receipts that arrive later or never, and a balance that is reconciled by memory. The result is a small permanent error that quietly contaminates expenses.
The fix is boring and works: a fixed float, a receipt for every withdrawal, and a top-up that restores the float to its exact original amount.
The imprest habit
Under an imprest system the float is always the same number, so counting it is trivial: cash plus receipts must equal the float. Anything else is a variance you find today rather than in April, while somebody still remembers what happened.
Top-ups are recorded as the expenses they represent, not as a lump transfer, which is what keeps the expense categories honest.
What SeroBooks does with this
Payments record their method and post to the account mapped for it, so cash movements are visible in the payments register and in cash flow by method rather than blended into a total. Expenses post to the accounts you mapped once in Setup.
The point is the same as everywhere else in the ledger: the method you record is data, not decoration.
See it in your own numbers.
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