Petty Cash

What is Petty Cash?

Petty cash is a small amount of physical currency kept in a locked location at a business office, used to pay for low-value purchases that don't justify the time or paperwork of a purchase order, check, or electronic payment. Common petty cash purchases include office supplies, postage, parking fees, emergency courier services, and small catering expenses for meetings.

The concept is straightforward: rather than running every $12 ink cartridge or $8 parking fee through the full procurement cycle, a designated custodian disburses cash from the fund, records the transaction on a petty cash voucher, and attaches a receipt. When the fund runs low, finance reviews the vouchers and replenishes the fund back to its original amount.

Petty cash is classified as a current asset on the balance sheet. Though the amounts are small relative to total company assets, the fund represents cash the business owns and can deploy immediately. For accounting purposes, petty cash appears under "cash and cash equivalents" alongside checking accounts and money market holdings.

How Does the Imprest System Work?

The imprest system is the standard method for managing petty cash. It works by keeping the fund at a fixed, pre-set amount and replenishing it only after all disbursements are documented and verified.

Here's the cycle: a company sets up a petty cash fund of $300. Over two weeks, the custodian pays out $240 across 18 transactions, each recorded with a voucher. The remaining cash ($60) plus the total vouchers ($240) should equal exactly $300. If they do, finance writes a check to "Petty Cash" for $240 to restore the fund. If they don't, the difference requires investigation.

IRS Publication 583 describes this process: "The total of the unspent petty cash and the amounts on the petty cash slips should equal the fixed amount of the fund" [1]. When the petty cash voucher totals approach the fixed amount, the custodian requests replenishment by presenting the accumulated slips. Finance reviews the vouchers, categorizes the expenses for the general ledger, and issues a replenishment check.

The imprest system's strength is its built-in audit mechanism. At any point, the cash plus the vouchers must equal the fund total. A discrepancy of even $5 signals either an unrecorded disbursement, a missing receipt, or potential misuse.

When Should Businesses Use Petty Cash?

Petty cash works best in a narrow band of scenarios. Understanding where it fits prevents both overuse (which creates control risks) and underuse (which forces employees into unnecessarily slow procurement processes).

Low-value, high-urgency purchases. A delivery person needs $15 for a toll reimbursement, and the accounting department is closed. A team needs $20 for whiteboard markers before a client presentation in two hours. These purchases are too small for a purchase order and too urgent for a reimbursement cycle.

Cash-only vendors. Some vendors, particularly local service providers, food trucks near event venues, or small-scale cleaning services, accept only cash. Petty cash bridges the gap until the vendor relationship justifies onboarding them as an accounts payable vendor.

Incidental office expenses. Day-to-day items that fall outside regular supply orders: replacement batteries for a conference room remote, a sympathy card for a colleague, or emergency snacks for a delayed evening meeting.

Where petty cash doesn't belong. Recurring purchases over $50, employee travel expenses, client entertainment, or anything that requires an expense report should route through the company's expense management system. Using petty cash for these categories bypasses the controls that expense policy enforcement provides.

Best Practices for Petty Cash Controls

Petty cash may involve small amounts per transaction, but the cumulative annual volume tells a different story. A company with a single $500 fund replenished weekly processes $26,000 through that fund each year. Companies with multiple locations multiply that figure by every site with a cash box. Effective controls matter.

Appoint a single custodian. One person manages the fund, handles disbursements, and maintains records. This person should not also approve expense reports or have access to the general ledger. Separating these duties is a fundamental fraud deterrent that the ACFE identifies as critical for cash-handling environments [3].

Require documentation for every transaction. Each disbursement needs a petty cash voucher recording the amount, date, recipient, business purpose, and category. Attach the original receipt when available. The IRS requires supporting documents for business expenses, and petty cash slips serve as the receipt management record for small purchases [2].

Conduct unannounced cash counts. Surprise audits are the strongest deterrent against petty cash misuse. Conduct them at irregular intervals, at least monthly, and vary the timing. Checking the fund on the same day each month gives a dishonest custodian a predictable window to cover shortages.

Set per-transaction limits. Most organizations cap individual petty cash disbursements at $25-$50. Any purchase above that threshold routes through the standard procurement or corporate card process. This prevents petty cash from becoming a workaround for approval workflows.

Reconcile the fund at least monthly. Beyond surprise counts, schedule formal reconciliation where the custodian's records are reviewed against the cash remaining. Document the reconciliation with signatures from both the custodian and a reviewer. Address discrepancies immediately rather than carrying them forward.

Petty Cash vs. Digital Payment Methods

The question isn't whether petty cash is useful but rather whether the scenarios that justify it are shrinking. Digital alternatives now handle most of the use cases that once required physical cash.

The comparison highlights a fundamental gap: petty cash transactions are inherently harder to trace, control, and reconcile than card-based alternatives. Navan's corporate card platform captures transaction data at the point of purchase, routes receipts automatically, and eliminates the manual voucher process entirely.

Where digital payment methods fall short is vendor acceptance. Not every parking meter, local vendor, or emergency situation accommodates cards. For these remaining scenarios, maintaining a small petty cash fund remains practical.

When Should You Consider Alternatives to Petty Cash?

Several indicators signal that a company has outgrown its petty cash system or should reduce its fund size.

Frequent discrepancies. If monthly reconciliation consistently reveals shortages, the fund is either poorly controlled or being misused. Both situations call for tighter controls or elimination. Switching to P-cards or corporate cards for small purchases removes the opportunity for unrecorded disbursements.

Multiple locations. Each office with its own petty cash fund multiplies the control burden. A company with 10 locations and $500 funds holds $5,000 in idle cash across the organization, and each fund requires its own custodian, reconciliation process, and audit schedule. Centralized prepaid card programs eliminate this fragmentation.

High replenishment frequency. If the fund is being replenished more than twice per month, the volume of transactions suggests a category of spending that would benefit from better tracking and policy enforcement than petty cash provides.

Compliance concerns. Industries subject to heightened financial scrutiny (healthcare, financial services, government contracting) may find that the audit trail petty cash produces is insufficient for regulatory requirements. Digital payment methods generate the granular, timestamped records that compliance officers and auditors expect.

Related Terms

• Cost Center: A department or unit within an organization that incurs costs but does not directly generate revenue, used for categorizing and tracking expenses including petty cash disbursements.
• Electronic Receipts: Digital proof-of-purchase documents that replace paper receipts, offering better preservation and automatic integration with expense management systems.
• Expense Reconciliation: The process of matching reported expenses against financial evidence like receipts and card statements to confirm accuracy before closing the books.

Sources

[1] IRS, "Publication 583: Starting a Business and Keeping Records," December 2025, https://www.irs.gov/pub/irs-dft/p583--dft.pdf

[2] IRS, "Publication 463: Travel, Gift, and Car Expenses," 2025, https://www.irs.gov/publications/p463

[3] ACFE, "Occupational Fraud 2024: A Report to the Nations," March 2024, https://www.acfe.com/fraud-resources