Petty Cash vs. Expense Reimbursements Explained
Petty cash is a small, pre‑approved fund of physical cash kept by a business to cover minor, day‑to‑day expenses that are impractical to pay by card or invoice. It is typically used for low‑value purchases such as office refreshments, postage, parking fees, or small cash‑only payments. A petty cash fund is managed by a designated custodian, who controls access to the cash, issues money for approved purposes, and collects receipts to maintain an audit trail. Each transaction is recorded using vouchers or slips, and the fund is regularly reconciled so that cash on hand plus receipts equals the original float. When used correctly, petty cash provides a simple, controlled way to handle small expenses while keeping accurate financial records.
A Practical Guide to Petty Cash & Expense Reimbursement
Ever needed to buy coffee for the office kitchen or pay a cash-only delivery driver? The scramble to find cash and the hassle of getting paid back is a universal office headache. For many small businesses, this leads to owners digging into their own pockets or handing over random cash, creating a bookkeeping mess later on.
This chaos isn’t necessary. There are two simple, organised methods for handling these situations: a petty cash fund or a formal expense reimbursement process. Both provide a clear system for tracking small office expenses, so everyone knows what to do when minor costs pop up.
Ask any bookkeeper, and they’ll tell you these tiny, untracked purchases quickly add up. A good system prevents money from mysteriously disappearing and saves you from the end-of-month scramble to remember what was spent and why. It provides clarity and control, and this guide will help you decide which system is right for your needs.
What Is a Petty Cash Fund? (Your Office’s Emergency Cash Drawer)
Ever needed to buy stamps for the office or tip a delivery driver, but no one had cash? A petty cash fund is the simple, organised solution. Think of it as a small, pre-approved amount of company money—a dedicated emergency cash drawer—set aside specifically for these minor, on-the-spot expenses.
The key purpose is to handle purchases too small or inconvenient for a company cheque or credit card. We’re talking about grabbing coffee for the breakroom, reimbursing an employee £8 for parking, or paying an unexpected postage fee. It’s strictly for the small stuff, typically for any single purchase under a set limit like £25 or £50.
To keep everything secure, the cash is usually stored in a locked box or drawer. One person—often an office manager or a trusted team member—is put in charge of it as the custodian. They become the single point of contact for handing out money and, most importantly, for tracking where every pound goes.
What’s an Expense Reimbursement? (The “Pay-Me-Back” Method)
What happens when an expense is too big for the cash box, like a client lunch or a major restock of office supplies? That’s where expense reimbursements come in. This is the formal “pay-me-back” system where a company repays an employee who used their own money for an approved business purchase.
Unlike petty cash, a reimbursement means you pay for the item first—usually with your own credit card or cash. To get your money back, you submit your receipts along with an expense report. This document provides the company with an official record of your spending so they can accurately repay the work-related cost.
Ultimately, the two systems solve different problems. Petty cash handles small, immediate cash needs from a shared company fund. Reimbursements are for larger, individual expenses that an employee covers upfront.
Petty Cash vs. Reimbursements: Which One Should You Use?
Deciding between the two systems comes down to a single question: how much does it cost? Most businesses set an informal expense limit, often between £25 and £75. Any purchase below this amount is perfect for petty cash, while anything above it should go through the reimbursement process. This simple rule is key to tracking small office expenses without creating a paperwork nightmare.
Following this guideline saves everyone a headache. It prevents employees from filling out reimbursement forms for a £5 purchase and stops the cash fund from being wiped out by one large expense.
How to Set Up Your First Petty Cash Fund
Setting up your fund is straightforward. It’s less about complex accounting and more about simple, practical organisation.
First, choose one person to be the custodian. Their job is to oversee the fund, hand out cash when needed, and collect receipts. Assigning a single custodian is the most important step for keeping the fund organised.
Next, decide how much cash to start with. For most small offices, a starting amount of £100 to £200 is a perfect sweet spot. This is typically enough to cover a month’s worth of small purchases without needing constant refills.
Finally, keep the cash in a secure but accessible location. A simple lockbox is the ideal solution. This provides a central, trusted spot for both the cash and the receipts.
The Process for Using Petty Cash (From Request to Receipt)
When someone needs to buy stamps or a new coffee filter, they don’t just grab cash. The process starts with a petty cash slip, or voucher, to ensure every pound is accounted for.
Think of this voucher as a formal IOU. Before taking money, the person fills it out with the date, the amount needed, and the purpose (e.g., “£12.50 for postage stamps”). This creates an instant paper trail. The custodian then signs off on it and hands over the cash.
After the purchase, the single most important rule comes into play: always get a receipt. A receipt is the official proof the money was spent on a legitimate business expense. Without it, the cash is simply unaccounted for from your bookkeeper’s perspective. This step is non-negotiable.
The employee brings the receipt—and any leftover change—back to the custodian to be placed in the lockbox. The original voucher is then attached to the receipt, completing the record for that transaction.
How to “Balance the Box” and Make Sure the Numbers Add Up
Over time, your petty cash box will have less cash and a growing pile of receipts. Before you refill the fund, you need to make sure everything adds up. This process, called petty cash reconciliation, is a simple balancing act to confirm that no money has gone missing.
The maths is straightforward. Your starting amount, minus the cash left in the box, should exactly equal the total value of all your receipts. For example, if you started with £100 and you now have £22.50 in cash, the receipts in your box should total precisely £77.50. This simple formula is the foundation of good petty cash accounting.
If the numbers don’t match, don’t panic. The first step is to recount your cash and re-add your receipts, as small errors are the usual culprit. If it’s still off, you may be looking for a missing receipt or an incorrectly filled-out voucher. Your goal is to get as close to a perfect balance as possible.
How to Refill the Fund When It Gets Low
Once you’ve balanced your records, it’s time to top up the fund. The goal is to bring it back to its exact starting amount. If you started with £100 and have receipts totalling £77.50, you will request exactly £77.50 in new cash. This ensures the fund’s balance is always predictable.
To get this new cash, the custodian takes the bundled receipts and the reconciliation summary to the business owner or bookkeeper. Think of it as an exchange: you are trading the proof of spending (the receipts) for the cash needed to replace what was spent. The owner will verify the total and then issue cash or a cheque for that precise amount.
This exchange is vital for the business’s overall bookkeeping. The bookkeeper uses that neat stack of receipts to formally record all the small purchases in the company’s main financial system. Meanwhile, you add the new cash to what was left in the box, bringing it right back to £100.
Implementing a petty cash system isn’t a chore, but a step toward financial clarity. By establishing rules—getting receipts for every purchase, setting spending limits, and avoiding personal IOUs—you build a system that is fair, simple, and effective. Start today by enforcing the most critical rule: no receipt, no cash. Once that becomes a habit, you will have turned a messy cash situation into a model of simple, trustworthy control.
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