Why 74% of Event Budgets Overrun and How to Prevent It
In brief: 74% of people planning major events exceed their original budget, often by 45% or more. The root cause is not overspending on any single item. It is the absence of live financial tracking between the initial quote and the final invoice. This article explains the pattern and what to do about it.
The pattern is consistent
The budget is set at the start. Quotes come in. Numbers get agreed. Then six months of planning happens, and by the time the invoices arrive, the total is 30% to 45% above the original figure.
This is not a JustSeventy observation. Research from Nunify and Gitnux shows that 74% of people planning high-value events admit to exceeding their original budget. Couples routinely underestimate total cost by nearly 45%.
The question is why.
The gap between quote and invoice
Most event budgets have two moments of visibility: the start, when quotes are gathered, and the end, when invoices land. Everything in between is invisible.
During that gap:
Small additions get approved verbally but never logged against the total.
Supplier scope creeps. A floristry upgrade here. An extra lighting rig there. Each one feels minor.
Currency movements, shipping surcharges and last-minute substitutions add up without a running total.
Nobody is tracking commitments in real time, so nobody knows the true position until it is too late.
Budget overruns are not the result of one bad decision. They are the result of dozens of undocumented ones.
Why traditional tracking fails
Spreadsheets are the default tool. They work at the start. But a spreadsheet only reflects what someone remembers to update. It does not capture verbal agreements, supplier amendments or scope changes in real time.
The spreadsheet becomes a historical record of what was planned, not a live picture of what has been committed.
What live financial control looks like
At JustSeventy, we use a live budget tracking system. Every line item, every commitment, every change is recorded as it happens. Not at the end of the month. Not when the invoice arrives. At the point of commitment.
This means:
The client sees exactly where they stand at any moment.
Every undocumented change gets flagged before it becomes a cost.
Overspend becomes visible early enough to make trade-offs, not just absorb the damage.
The system does not stop clients spending more if they choose to. It stops them spending more without knowing it.
The fix is structural, not behavioural
You cannot solve budget overruns by being more careful. Careful people still exceed budgets, because the problem is not carelessness. The problem is opacity.
If you are planning a high-value event and there is no live financial control layer between you and the final invoice, overruns are not a risk. They are a certainty.
At JustSeventy, we call this the control gap. Closing it is what we do.
Read more:How I Actually Build an Event Budget
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Laurie Weitzkorn, Director