A dental office petty cash policy should authorize one small, fixed fund for specified low-value expenses, name its custodian, and require evidence for every payment. At reconciliation, cash remaining plus valid, unreplenished vouchers should equal the authorized float. Replenish documented spending through an independent review instead of adding an arbitrary amount when the box looks low.
That fixed-fund arrangement is commonly called an imprest fund. Keep it separate from patient collections, a change drawer, employee loans and owner withdrawals. These recommendations describe a practical office control; have the accountant approve the bookkeeping and the owner approve the spending rules.
Decide whether cash is necessary
List the recent purchases that genuinely required small cash payments. If an approved purchasing card or normal reimbursement route handles them adequately, the office may not need a petty cash fund at all.
If it does, choose the float from expected eligible use between reviews, not from a supposed dental-industry benchmark. Record the approved amount, permitted expense categories, maximum payment, replenishment trigger, custody arrangement and review cadence.
For an illustrative policy, an office might authorize a $200 float and a $40 per-purchase limit for specified incidental office supplies and postage. Those amounts are examples, not recommended universal limits. Exclude clinical substitutions from administrative discretion even when their price is small.
Use the purchasing approval process for the underlying buying authority. Petty cash changes the payment channel, not who may approve a purchase. Prohibit splitting one purchase into several vouchers to get below the limit.
Assign custody and a real second review
Name one custodian and an authorized backup. Keep the fund in a locked location with restricted access, and do not allow informal borrowing or self-service withdrawals. A shared box with several unrecorded users makes an unexplained difference harder to resolve fairly.
Cornell's institutional petty-cash procedures provide a useful control example: secured funds, receipts identifying payments and periodic supervisory reconciliation. They govern Cornell, not dental practices; the office should adopt its own approved responsibilities and review frequency. Cornell petty-cash procedures
The custodian can prepare a replenishment packet, but someone else should inspect the evidence and approve release. In a small practice, that second person may be the owner or an independent accounting professional. Name a substitute reviewer before an absence rather than allowing the custodian to approve their own request.
Decide how custody transfers for leave or turnover. Both parties should count the cash and outstanding vouchers, identify unresolved differences, and sign the handover. Giving someone the key without a count does not establish what they received.
Make each voucher explain the cash movement
Use a unique, sequential voucher reference. Retain voided references with a reason so a gap does not become an unexplained missing payment.
| Voucher field | What the reviewer needs |
|---|---|
| Number and transaction date | Unique identity and the actual payment date |
| Amount and recipient | Exact cash issued and who received it |
| Business purpose | Specific approved office expense |
| Purchase evidence | Itemized receipt and evidence of payment |
| Authorization | Approver and any relevant purchase reference |
| Accounting category | Proposed expense classification for review |
| Replenishment reference | Which reviewed packet reimbursed this voucher |
The IRS illustrates receipt-backed petty-cash slips and replenishment in Publication 583.
Keep patient names and clinical details out of the cash log. A specific administrative purpose is more useful than an unnecessary patient narrative.
Prefer reimbursement of an approved, completed purchase over open-ended advances. If the office permits an advance, track it separately with its recipient, amount and settlement deadline. At settlement, replace the advance record with the receipt and returned change; never count the original advance and its replacement voucher together.
Prove the float before replenishing it
Choose a cutoff and pause disbursements during the count. Count bills and coins by denomination. Total only vouchers that have not already been replenished, then list any unsettled advances or unsupported payments separately for review.
Here is an independently constructed example with no advances or disputed receipts:
| Reconciliation item | Amount |
|---|---|
| Cash counted | $113.50 |
| Voucher 021: approved postage | $18.40 |
| Voucher 022: incidental office supplies | $27.60 |
| Voucher 023: approved office supplies | $40.50 |
| Total vouchers | $86.50 |
| Cash plus vouchers | $200.00 |
| Authorized float | $200.00 |
| Difference | $0.00 |
The arithmetic ties: $18.40 + $27.60 + $40.50 = $86.50, and $113.50 + $86.50 = $200.00.
But the policy check fails if this office uses the illustrative $40 purchase limit. Voucher 023 exceeds it by $0.50. A balanced box does not prove that every payment was authorized. Flag that payment for the owner's exception decision; do not split the voucher or hide the excess in another category.
If the reviewer confirms the evidence and approves the documented exception, a replenishment of $86.50 restores physical cash to $200. Mark the three vouchers as included in that packet so they cannot support a second replenishment. Retain the exception with the packet rather than silently rewriting the original approval.
Have the accountant specify how expenses and fund movements are posted. Do not expense the same receipt once when paid and again when replenished. Cornell's accounting guidance distinguishes establishing the fund from replenishing expenses; its account codes are institution-specific and should not be copied into the practice's books. Cornell fund and replenishment guidance
Leave shortages visible until explained
Now change only the physical count in the example to $108.50. With the same $86.50 of vouchers, the total is $195.00: a $5.00 shortage. Replenishing the vouchers alone would leave $195.00 in cash, not the authorized $200.00.
Recount, check the voucher sequence and review recent payments, returned change, transfers and already replenished receipts. Preserve the original count and record any supported correction. An overage needs the same factual review; it is not spare money available for a future purchase.
Do not invent a receipt, add personal money quietly or deduct a shortage automatically from wages. Escalate the difference to the owner and accountant; any recovery or employment action needs appropriate fact-specific review. If the amount remains unexplained, keep it separately identified and obtain approval for the accounting treatment and any restoration of the float.
A missing receipt is a documentation exception, even when the cash count matches an employee's explanation. Request replacement evidence through the approved process. Do not describe an unsupported payment as a verified expense merely to complete the packet.
Review the fund as its own control
The bank reconciliation can confirm a replenishment withdrawal reached the books; it cannot prove what remains inside the box. Periodically have an independent person inspect the cash, unreplenished vouchers, repeat exceptions and custody record.
Use the broader embezzlement-prevention process if findings warrant investigation, without treating a shortage as proof of misconduct. If the fund is rarely used or repeatedly bypasses normal purchasing, consider reducing or closing it through an approved count, deposit and accounting entry. The finished control should explain every dollar without relying on the custodian's memory.
