A petty cash custodian is the one employee authorized to hold a company’s on-site cash fund, disburse money from it, document every transaction, and reconcile the balance so the fund always ties back to a fixed amount. Most businesses keep between $100 and $1,000 in the fund for small purchases like office supplies or postage, and the custodian is the single point of accountability for every dollar in the box. Poor management of the role can lead to disallowed tax deductions, internal fraud, or both.
Core Duties of the Role
The custodian is the only person who opens the cash box and hands out money. That single-point-of-contact rule is the backbone of every internal control around petty cash: if money is missing, there is exactly one person to ask. Organizations that let multiple employees dip into the fund almost always end up with unexplained shortages and no way to trace them.
The work runs on a cycle known as the imprest system. The custodian reviews each request, confirms it fits company policy, and disburses the cash. When the purchaser returns, the custodian collects a receipt, attaches it to a petty cash slip, and logs the transaction. When the fund runs low, the slips and receipts go to accounting, which cuts a check to restore the fund to its original fixed amount. Because the fund is always supposed to reconcile to the same number, any gap between cash on hand plus slips versus the fixed balance points to a problem.
Documenting Each Transaction
Every time cash leaves the fund, the custodian fills out a petty cash slip noting what was purchased, how much was spent, and who received the money. A vendor receipt gets attached as proof of payment.1Internal Revenue Service. Publication 583 – Starting a Business and Keeping Records For expenses of $75 or more, the IRS requires documentary evidence such as an actual receipt or paid bill.2eCFR. 26 CFR 1.274-5 – Substantiation Requirements Below that threshold a petty cash slip with the relevant details is generally sufficient, but keeping receipts for every transaction is the smarter practice because it eliminates arguments during audits.
Reconciling the Fund
At least monthly, the custodian counts the remaining cash, totals all outstanding slips, and confirms the two figures add up to the fund’s fixed amount. If the fund is set at $300 and there is $85 in cash plus $215 in slips, the math checks out. If it does not, there is a shortage or an overage that needs investigating.
Discrepancies get recorded in a Cash Short and Over account. Small, occasional differences are normal and expected. Persistent or large shortages are a different matter and will draw serious scrutiny during internal reviews or external audits. The custodian should document every discrepancy the moment it is discovered rather than trying to fix it quietly. A transparent record of small errors is far more credible than a clean ledger that collapses under examination.
Replenishing the Fund
When accumulated slips approach the fund’s fixed amount, the custodian submits the slips and receipts to accounting. Accounting verifies the documentation, cuts a check to “Petty Cash” for the total of the outstanding slips, and the custodian cashes it to bring the fund back to its original balance.1Internal Revenue Service. Publication 583 – Starting a Business and Keeping Records This is what keeps expenses recorded properly in the company’s books and lets the business support those deductions if the IRS asks questions.
What Petty Cash Cannot Be Used For
The fund exists for small, routine business expenses. It is not a lending window, an ATM, or a workaround for purchases that belong in normal procurement. Common prohibited uses:
- Personal loans or advances to employees, even temporary ones. Misuse for personal purposes can result in the fund being permanently revoked.
- Cashing personal or payroll checks. The fund is not a bank.
- Gift cards, which are essentially untraceable cash equivalents and a common vehicle for fraud.
- Alcohol, which typically falls outside petty cash policy and faces stricter IRS substantiation rules.
- Vendor invoices, which belong in accounts payable.
- Payments to contractors or employees for services, which trigger tax reporting obligations petty cash is not designed to handle.
Splitting one purchase across multiple slips to stay under the per-transaction limit is also prohibited. A $120 supply run from one vendor on one day is a purchase order, not two petty cash withdrawals.
Per-Transaction Limits and the $75 Threshold
Most organizations cap individual disbursements somewhere between $25 and $75. The $75 figure has practical tax significance: IRS regulations require documentary evidence for any business expenditure of $75 or more.2eCFR. 26 CFR 1.274-5 – Substantiation Requirements Setting the per-transaction ceiling at or below that threshold does not eliminate the need for slips, but it does reduce the formal substantiation burden.
The bigger concern is missing documentation. The IRS can disallow deductions for business expenses that lack adequate records, and courts have upheld those disallowances when the taxpayer could reasonably have been expected to keep records but did not.3Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses For a petty cash fund, proper recordkeeping is always feasible, so the “we lost the receipts” defense carries almost no weight.
Who Can Serve as Custodian
Not just anyone should hold the fund. The ideal custodian is a permanent, full-time employee with no involvement in the general ledger, reconciliation, or audit functions. This separation of duties is a core internal control principle: the person handling cash should not also be recording or reviewing those transactions in the accounting system.4U.S. Government Accountability Office. Standards for Internal Control in the Federal Government When the same employee can disburse cash and manipulate the records that track it, fraud can go undetected for months.
Beyond that structural requirement, the custodian needs to be organized, comfortable with basic arithmetic, and consistent about paperwork. Training before handing over the cash box matters too. It should cover the company’s spending policies, documentation rules, prohibited uses, physical security procedures, and what to do when the count does not add up. Skipping that step is how a well-meaning employee ends up making honest mistakes that look like fraud during an audit.
How the Appointment Works
Formalizing the role usually follows a set sequence. The employee’s full name, employee ID, and department are recorded on an appointment or custodial agreement form. The form specifies the fund’s maximum amount and the physical location where the cash will be stored. A department head signs off to confirm the fund is operationally necessary and the selected employee is suitable. The form then goes to the controller or finance director for final approval.
Once approved, accounting issues a check or cash disbursement to establish the fund. The custodian receives the physical security equipment, at minimum a locking cash box with keys, and a formal notification confirming responsibilities and the effective date. That date becomes the baseline for all future reconciliations and audits. In many organizations, the custodial agreement explicitly states that the custodian accepts fiduciary responsibility and may face collection action or payroll offset if money goes missing.
Physical Security and Independent Counts
A fund sitting in an unlocked desk drawer is an invitation for theft. The container should be locked and stored in a secured area, and the level of protection scales with the amount on hand.
- Under $1,000: a locking cash box or lockable receptacle in a restricted area.
- $1,000 to $2,500: a proper safe, ideally bolted to the floor or secured inside heavy furniture.
- Above $2,500: a steel-door safe with at least one-inch door thickness and half-inch wall thickness.
A few principles apply at any dollar amount. The container should have dual locks, whether two keys or a key-and-combination setup. Access should be limited to the custodian and one authorized backup. Duplicate keys belong in a separate secure location under someone else’s control, not in the custodian’s desk. Management should also restrict access to the area where the fund is stored.4U.S. Government Accountability Office. Standards for Internal Control in the Federal Government
Self-reported reconciliations are not enough on their own. Someone independent of the fund, whether a supervisor, an internal auditor, or a finance representative, should verify the count on an unannounced basis. Scheduling these reviews in advance gives a dishonest custodian time to cover shortages with personal cash before the count. During a surprise count, the reviewer counts the cash in the custodian’s presence, totals all vouchers and receipts, and confirms everything adds up. Both parties sign the completed count sheet.4U.S. Government Accountability Office. Standards for Internal Control in the Federal Government Most organizations run these checks quarterly or semi-annually, though higher-risk environments or larger funds may warrant monthly reviews.
Handing Off or Closing the Fund
When a custodian leaves the position through resignation, transfer, or termination, the fund cannot simply be handed to the next person. A formal transfer protects both the outgoing and incoming custodian from blame for shortages they did not cause.
The outgoing custodian performs a final reconciliation with a supervisor or fiscal officer present. Every dollar of cash and every receipt is counted and documented. Both custodians sign off on the count, fixing the precise moment responsibility shifts. The signed count sheet goes to accounting so the records reflect the new custodian’s name, which matters because replenishment checks are typically issued in the custodian’s name and must be endorsed by that individual.
If no replacement is immediately available, the fund should be closed entirely. The remaining cash and all documentation go back to accounting, and the fund is zeroed out on the books. A new fund can be established later when a qualified custodian is appointed through the standard process. The one thing you never do is let a departing employee informally pass the cash box to a coworker. If a shortage surfaces weeks later, neither person will be able to prove it was not their fault.