How to Track Expenses During an Event

You have spent weeks building your event budget and tracking every pre-event expense carefully. Then the event day arrives and financial discipline goes out of the window. Someone needs to make an emergency trip to the hardware shop. A performer's rider requires items nobody budgeted for. The parking meter needs feeding. A piece of equipment breaks and needs replacing on the spot.

These on-the-day expenses are where budgets quietly leak money. Without a system to capture them in real time, you lose track of what was spent, receipts disappear, and your post-event reconciliation becomes guesswork. Here is how to stay on top of event-day finances.

Set up before the event

Create a petty cash float

Withdraw a fixed amount of cash before the event and designate it as your petty cash float. The amount depends on your event size, but £100 to £300 covers most small to medium events. Record the starting amount and assign one person to manage it. At the end of the event, the remaining cash plus receipts should equal the starting amount exactly.

Designate a finance contact

On event day, you will be busy. Designate one person on your team as the finance point of contact. All spending requests go through them, all receipts go to them, and they are responsible for logging every transaction. This prevents the situation where five different people are spending money independently with no central record.

Prepare an expense log

Create a simple paper form or shared digital document that captures:

• Time of purchase
• What was bought
• Amount
• Who made the purchase
• Payment method (petty cash, card, personal money to be reimbursed)
• Receipt collected (yes/no)

Print several copies of this form and keep them at your event office or production desk. A clipboard and pen are more reliable than a phone app when things are hectic.

During the event

Capture receipts immediately

The number one rule of event-day expense tracking is: if you spend money, get a receipt, and photograph it immediately. Paper receipts fade, get wet, and get lost. A photo on your phone is a reliable backup. Most accounting apps like Xero and QuickBooks have a receipt scanning feature in their mobile app that captures and categorises receipts in seconds.

Keep a dedicated envelope or folder at your event base for physical receipts. At the end of the event, everything goes into that folder. No exceptions.

Log every transaction as it happens

Do not rely on memory. When your stage manager spends £15 on gaffer tape or your front-of-house team grabs extra bottled water from a nearby shop, it goes in the log immediately. Small amounts add up. Ten unrecorded expenses of £10 each is £100 missing from your accounts.

Track staff reimbursements

If team members spend their own money on event-related purchases, they need to submit receipts for reimbursement. Create a simple reimbursement form that captures their name, what they bought, the amount, and a photo of the receipt. Process reimbursements promptly after the event, as delays damage team morale.

Monitor cash income

If your event takes cash payments (bar sales, merchandise, donations), track it separately from card transactions. Count and record cash at regular intervals during the event rather than waiting until the end. For bar operations, a Z-reading from the till at each count gives you a running total to reconcile against later.

Common event-day expenses people forget to track

• Parking -- For the venue, for performers, for your team
• Last-minute supplies -- Batteries, tape, cable ties, cleaning products, ice
• Food and drink for crew -- Performer riders, staff meals, water for the production team
• Transport -- Taxis, fuel, van hire for moving equipment
• Tips and gratuities -- To venue staff, drivers, or other service providers
• Emergency replacements -- A broken microphone stand, a blown speaker fuse, a replacement projector bulb
• Waste disposal -- Skip hire, bin bags, recycling fees

None of these are large amounts individually, but collectively they can account for 5 to 10 percent of your total event costs. Capturing them means your budget for the next event will be far more accurate.

Post-event reconciliation

Within 48 hours of the event, while everything is still fresh, sit down with your expense log and reconcile:

1. Count remaining petty cash -- Starting float minus remaining cash equals total petty cash spent. This should match the sum of petty cash entries in your log.
2. Match receipts to log entries -- Every log entry should have a corresponding receipt. Flag any missing receipts while you can still remember what they were for.
3. Process card transactions -- Check your business bank account or card statement for all event-day card transactions. Match each one to a log entry.
4. Calculate reimbursements -- Total up what team members are owed and process payments.
5. Compare to budget -- How does your actual event-day spending compare to what you budgeted? Were there categories that came in over or under? Record these variances for future planning.

Enter all reconciled expenses into your main accounting system or spreadsheet. This completes the financial record for the event and gives you the accurate cost data you need for tax reporting and future budgeting.

Digital tools that help

While paper systems work fine for small events, digital tools can streamline the process:

• Receipt scanning apps -- Most accounting software includes a mobile app with receipt scanning. Photograph a receipt and it is automatically uploaded and categorised.
• Shared spreadsheets -- A Google Sheet accessible to your whole team means everyone can log expenses from their phone in real time.
• Prepaid business cards -- Some business accounts offer prepaid cards for team members. You load a fixed amount and can see every transaction in real time. This eliminates the need for reimbursements entirely.
• Expense management platforms -- For larger events or event businesses running multiple events, dedicated expense management tools can automate approvals, receipt matching, and reporting.

The best system is the one your team will actually use. A simple paper log that gets filled in consistently beats a sophisticated app that nobody opens on event day. Start simple, and add complexity only if the simple version stops working for you.

For more on managing event finances, see our guide to accounting basics for event businesses.