Managing Petty Cash and Employee Reimbursements

Petty cash and employee reimbursements can feel like an admin headache, but if you don’t manage them properly, you’re inviting mistakes, fraud, and HMRC headaches. This guide will show you exactly how to set up, control, and record petty cash and employee expenses in your UK small business. You’ll get step-by-step processes, real UK examples, tips to avoid common pitfalls, and advice on keeping your accounts watertight – all tailored to the UK’s legal and tax requirements.

Petty cash and staff expense reimbursements might seem minor in the grand scheme, but they're a frequent source of error and fraud in UK small businesses. HM Revenue & Customs (HMRC) expects you to keep detailed records for all business spending, no matter how small. Poor controls can lead to lost money, inaccurate accounts, and even penalties for failing to keep proper records.

When petty cash or employee expenses aren't managed properly, you risk duplicate payments, unclaimed VAT, and discrepancies that can snowball into bigger issues at year-end. These errors can also undermine trust within your team—if people see that cash is handled casually, it can create a culture where rules aren’t taken seriously.

On the positive side, a clear and robust process for petty cash and reimbursements will help you reclaim VAT, control your spending, and spot problems before they become major headaches. It also makes your business more resilient to fraud, and easier to audit, both for your own peace of mind and for HMRC.

• Improves cash flow visibility and forecasting
• Prevents accidental overspending or duplicate claims
• Ensures you reclaim all eligible VAT
• Reduces risk of financial fraud and theft
• Keeps you compliant with UK tax law

A petty cash float is a fixed amount of physical cash you keep on your premises for minor business purchases—think milk, postage, or emergency stationery. In the UK, most small businesses keep between £50 and £200 in their float, though you can set it higher or lower based on your needs. The key is to treat your petty cash as seriously as your main bank account.

You should nominate one person as the petty cash custodian, responsible for issuing cash, logging every transaction, and keeping the money secure. All cash movements must be recorded in a petty cash log or through your accounting software. The float should be stored in a locked box, ideally in a secure, access-controlled location.

When the float runs low, you ‘top up’ to the original amount by withdrawing from your business bank account. This is known as the imprest system, and it’s the standard method recommended by UK accountants because it makes reconciliation straightforward and helps prevent unauthorised spending.

• Set a fixed float amount and stick to it
• Appoint a responsible custodian for cash handling
• Require receipts for every petty cash spend
• Keep the cash locked away at all times
• Reconcile the float regularly (ideally monthly)

Every time you spend from your petty cash, record the transaction immediately. Each entry should include the date, amount, purpose, name of the person taking the cash, and a reference number. Always demand a VAT receipt, not just a card slip—this is critical if you want to reclaim VAT. If the receipt is missing or incomplete, log it as such, but make a note that VAT cannot be reclaimed on that transaction.

Reconciliation means checking that the remaining cash plus the value of receipts equals the original float. For example, if you started with £100, spent £60 (with receipts), you should have £40 left. Reconcile at the end of each month, or whenever you top up the float. Any discrepancies must be investigated immediately—repeated shortfalls are a red flag for theft or sloppy admin.

At each reconciliation, transfer petty cash records into your main accounts. Most UK small businesses use a dedicated 'Petty Cash' account in their chart of accounts, making it easy to track movements separately from the main current account. This is essential for correct bookkeeping and for satisfying HMRC if you're inspected.

Employee expense reimbursements are how you pay back staff for business costs they've paid out of their own pocket—travel, client meetings, small supplies, and more. It’s essential to have a clear, written expenses policy that sets limits, allowable expenses, documentation requirements, and approval procedures. This not only streamlines admin but also reduces the risk of disputes or non-compliant claims.

Your policy should make it clear which expenses are covered (and which are not), the maximum you’ll reimburse, and the process for submitting claims. For example, HMRC allows you to reimburse ‘reasonable’ travel and subsistence costs, but will disallow claims for non-business or excessive expenses. You should also specify how quickly expenses will be paid (e.g., within 14 days of approval) to keep staff happy and loyal.

Most UK businesses now use digital expense management tools—like Expensify, Zoho Expense, or the built-in modules in Xero or QuickBooks. These tools let staff upload photos of receipts, categorise expenses, and track the status of claims. This speeds up approvals and makes it easier to export data into your accounts. For more on accounting software, see The Best Cloud Accounting Software for UK Businesses (Xero, QuickBooks).

• Set clear approval levels—e.g., line manager, then finance
• Require original receipts for all claims (not just card statements)
• State which costs are reimbursable (travel, meals, supplies, etc.)
• Explain how mileage and subsistence rates are calculated
• Define timeframes for claim submission and payment

Mileage is one of the most common employee expenses. In the UK, you can pay ‘approved mileage rates’ without triggering tax. For cars and vans, it’s 45p per mile for the first 10,000 miles in a tax year, then 25p per mile after that. For motorcycles, it’s 24p per mile, and for bicycles, 20p per mile. Always require a mileage log showing date, journey, purpose, and distance to ensure claims are accurate and compliant.

Subsistence covers meals and accommodation while travelling for work. HMRC allows reasonable reimbursements, but you must be able to show that the expense was necessary for the business. For example, buying lunch while at your normal workplace is not claimable, but lunch on a day trip to visit a client is. Set maximum daily rates in your policy to avoid disputes.

Other common reimbursable expenses include public transport fares, parking, tolls, and minor business supplies. For each, require a receipt and a clear explanation of the business purpose. If you’re VAT registered, make sure the receipt is a valid VAT invoice—this is a frequent area where small businesses miss out on VAT recovery.

Fraud and mistakes are a real risk with petty cash and staff expenses. Common issues include fake receipts, double claims, or cash disappearing from the float. The best defence is a combination of strong processes, regular checks, and a culture of accountability. You should design your system so that no one person can both authorise and reconcile the same set of transactions.

Random spot checks and monthly reconciliations are essential. If possible, rotate petty cash custodians every so often to discourage complacency and collusion. Make it clear in your staff handbook that misuse of petty cash or expenses is a disciplinary offence—don’t be afraid to follow through if you catch someone abusing the system.

Digital tools help reduce manual errors and flag suspicious patterns, such as duplicate claims or excessive spending in one area. Train staff on your policy and explain why it matters—not just for the business, but for their own protection.

• Never pre-sign blank petty cash slips or reimbursement forms
• Implement a two-stage process for approvals and payments
• Run regular spot-checks on both cash and staff expense claims
• Require original receipts—no exceptions
• Rotate the person responsible for petty cash periodically

For every petty cash top-up or staff reimbursement, you need a matching journal entry in your accounting system. For petty cash, this means transferring funds from your main bank account into the 'Petty Cash' account, and recording each spend as an expense against the correct category (e.g. 'Postage & Stationery'). For reimbursements, record the payment as an expense, and attach all supporting receipts and forms.

At the end of each month, reconcile your petty cash and staff expense accounts—check that physical cash matches your records, and that all reimbursements are supported by documentation. If you use cloud accounting, upload digital copies of receipts so you have a clear audit trail. This is especially important if you’re VAT registered, as HMRC can ask for proof of any input VAT you reclaim.

If you spot discrepancies, investigate promptly. Regular reporting on petty cash and staff expenses helps you spot trends—perhaps one team is overspending, or you’re missing VAT receipts from certain suppliers. Use this data to improve your controls and cut unnecessary costs.

Many small businesses slip up by being too casual about small amounts. Common mistakes include failing to get receipts, mixing personal and business spending, and not reconciling the float regularly. These errors can add up, both in lost money and increased risk of HMRC penalties.

Another frequent problem is reimbursing expenses that HMRC would class as taxable benefits—like home-to-work travel, or lavish meals. This can create unexpected tax bills for both your business and your employees. Always check the latest HMRC guidance before approving anything borderline.

Finally, many businesses miss out on reclaiming VAT because they haven’t collected proper VAT invoices, especially for petty cash spends. Don’t let the small values fool you—over a year, these can add up to hundreds of pounds in missed VAT recovery.

• Never top up petty cash without a full reconciliation
• Don’t accept non-itemised receipts or credit card slips as proof
• Avoid reimbursing personal expenses, even if 'for convenience'
• Regularly update your policy as HMRC rules change
• Keep all records for at least 6 years for HMRC compliance