A small cash box can create surprisingly large bookkeeping questions. Someone pays for parking, another person buys a few supplies, and a handwritten note replaces a receipt. By the time the cash needs topping up, nobody is certain which purchases the remaining paperwork covers.
Petty cash works better when every movement has a clear record. The aim is not to build a complicated approval system for minor purchases. It is to make the cash on hand, the supporting documents and the next bookkeeping step understandable to someone who was not there.
Decide what the fund is for
Write down the types of small business purchases the fund may cover, who can approve them and who looks after the cash. Set a practical spending limit that suits your own operation. Do not treat the fund as a shared wallet for personal purchases or informal loans.
Keep it separate from customer cash receipts and any till float used to provide change. Mixing these purposes makes it harder to explain whether a movement relates to a purchase, a sale or a change in the amount held.
Record the starting point
Count the cash and note the date, the amount and the person completing the count. If you are introducing a new routine to an existing fund, flag any unexplained difference rather than inventing purchases to make the figures fit.
Use one simple log with columns for the date, money added, money taken out, purpose, person responsible and document reference. Agree with your bookkeeper how the log will be shared and how the entries will be reflected in the books.
Close the loop on each purchase
When cash is handed out before a purchase, record who received it, the purpose and the amount. Once the purchase is complete, record the actual spend and any change returned. Link the itemised receipt to that entry.
For example, if someone takes $40 for supplies, spends $28 and returns $12, those three facts belong together. An initial cash advance of $40 is not evidence that $40 was spent.
If a receipt is missing, label the entry as needing follow-up. A note about the purchase can help the investigation, but it should not be presented as an original supplier receipt. Give the unresolved item an owner and a next step.
Compare the log with the cash on hand
Choose a regular review point and count the actual notes and coins. Compare the count with the balance expected from the log: starting cash plus additions, less cash paid out, plus any change returned.
For a fixed fund, cash remaining and documented spending should explain the agreed total when there are no outstanding advances or unresolved differences. Identify those exceptions separately so they do not disappear inside a total.
Where practical, have another person review the count. Record when the check happened and what still needs attention. A difference is a prompt to investigate dates, missing entries or returned change—not a reason to quietly rewrite the log.
Make replenishment easy to trace
When the fund is topped up, record the date, amount and bank transaction reference. Keep that replenishment linked to the reviewed log and receipts it supports.
Give your bookkeeper both sides of the story: the cash added and the underlying purchases. Ask how they want these recorded so the same spending is not entered once from the receipts and again from the bank withdrawal. Avoid guessing a category for the entire top-up based on one purchase.
Keep the routine small enough to maintain
Store the cash securely and limit access to the people who need it. Keep the supporting documents in one agreed location. If responsibility changes, complete a dated count and handover instead of simply passing on the box.
Start with a manageable habit: log each movement, return change promptly and review the balance before replenishing. Clear records make small purchases easier to explain without relying on everyone's memory.
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