Petty cash sounds like a small, low-risk part of running a business — a drawer with a few hundred dollars for parking, office supplies, or a last-minute delivery tip. But petty cash funds are also one of the easiest places for money to quietly disappear, precisely because they operate outside the normal invoice-and-approval process. A simple written policy closes most of the gap between "convenient" and "unaccountable."
Decide Whether You Need Petty Cash At All
Before writing a policy, ask whether petty cash is still necessary. Corporate cards, virtual cards issued per employee or per vendor, and reimbursement apps have replaced petty cash in many businesses, because every transaction on a card creates its own digital record automatically. If your need is truly occasional — a few small purchases a month — a low-limit company debit card with app-based receipt capture may accomplish the same goal with far less manual reconciliation. Petty cash still makes sense in some environments, like a retail location needing exact change or a job site with no reliable card access, but it's worth confirming the need before building a process around it.
Set a Fixed Fund Amount and a Custodian
Use the imprest system: establish a fixed total (say $200 or $300), assign a single named custodian responsible for it, and keep that total constant. Every time cash goes out, a receipt or voucher comes in to replace it, so cash on hand plus receipts on file should always equal the fixed amount. Only one person should have access to the fund. Splitting custody among multiple employees, or letting anyone in the office dip into the drawer, is the single most common way petty cash controls break down.
Require a Voucher for Every Disbursement
No cash should leave the drawer without a paper or digital voucher recording the date, amount, purpose, recipient, and a receipt attached once the purchase is complete. Pre-numbered voucher slips make it obvious if one goes missing. For purchases that come with a same-day receipt, staple it to the voucher immediately rather than promising to turn it in later — "I'll get you the receipt" is where petty cash reconciliation goes to die.
Set a Per-Transaction Limit
Define a maximum amount petty cash can cover per transaction — commonly $25 to $50. Anything above that should go through a normal purchase order or reimbursement process with proper approval. Without a stated limit, petty cash quietly becomes an alternate purchasing channel that bypasses the controls the rest of the business relies on.
Reconcile on a Fixed Schedule
Count the drawer and reconcile vouchers against the fixed fund total on a set schedule — weekly for an active fund, monthly at minimum. Reconciliation should be done or reviewed by someone other than the custodian whenever possible, so the person controlling the cash isn't also the only person checking it. Replenish the fund back up to its fixed amount only after the reconciliation is complete and matches, and record the replenishment as an expense in the accounting system coded to the appropriate categories from the vouchers.
Prohibit Common Misuses Explicitly
Put it in writing: petty cash may not be used for employee loans or salary advances, IOUs, personal purchases with a promise to repay, or cashing personal checks. These uses feel harmless in the moment and are consistently how petty cash funds spiral into unreconciled losses. A written prohibition gives the custodian a clear, defensible reason to say no when asked.
Secure the Cash Physically
Keep the fund in a locked box or drawer, not an open cash register tray or unlocked desk. Limit knowledge of the combination or key location to the custodian and one backup person (such as the custodian's manager) for continuity when the custodian is out. If the fund is kept in a location with any public or customer access, physical security matters even more.
Include Petty Cash in Your Regular Audit Process
Petty cash should not be exempt from whatever periodic financial review or audit process the rest of the business goes through. Surprise counts, done occasionally without advance notice to the custodian, are one of the most effective deterrents to misuse because they remove the ability to quietly true up a shortfall before anyone checks.
A petty cash fund that runs well is almost invisible — it reconciles cleanly every time and nobody thinks twice about it. A petty cash fund that runs poorly becomes a recurring source of unexplained shortages and awkward conversations. The difference is almost never the amount of money involved; it's whether a simple written policy, a single accountable custodian, and a real reconciliation schedule are actually in place.
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