Contingency and refunds: the two budget lines that decide thin margins
Events with a healthy projected margin often finish flat because of two lines that were never modelled: the money spent when something goes wrong, and the revenue handed back when tickets are returned.
Size contingency against the risky part of the cost base
A single percentage applied to every cost overstates the buffer on contracted lines and understates it on the volatile ones. Venue hire agreed in writing rarely moves; staffing overtime, equipment hire and production changes do.
If you use one overall percentage for simplicity, choose it from your own past variance between budget and final spend rather than convention.
Model refunds as a share of ticket revenue
Refunds reduce revenue after the fixed cost base is committed, so their impact on profit is close to one-for-one. A few percent of ticket revenue is enough to erase a thin margin.
Your refund policy is therefore a financial decision, not only a customer-service one. Transferability, tiered deadlines and optional refund protection all change the rate you should assume.
Keep both inside the same calculation
Contingency and refunds should sit inside the forecast alongside fees and tax, so break-even attendance and margin already account for them. A buffer held in your head does not appear in the break-even number you use to negotiate.
In Profit/AI both are inputs to the deterministic engine, which means you can see exactly how many attendees a one-point change in refund rate costs you.
Record what you actually spent
After the event, compare the contingency you budgeted with what you used and the refund rate you assumed with what occurred. Two or three events of this data turn a convention into an assumption grounded in your own operation.
Put contingency and refunds in the model, not in your head — they are usually the difference between projected and actual profit.
Run your own numbers through the same deterministic engine — projected profit, margin and break-even attendance from your inputs, with no account required.
Written by
Profit/AI Editorial DeskThe Profit/AI Editorial Desk writes the event budgeting and forecasting guides on this site. Every guide is built around the same deterministic calculations the Profit/AI forecast engine runs: contribution margin, break-even attendance, capacity utilisation, fee and refund handling, and scenario comparison.