The trap of budget control is thoroughness. A monthly meeting that works through forty line items to explain €300 swings exhausts everyone's patience, and after four months there's no meeting left.
Rule 1: material and relevant
A variance only deserves analysis if it's significant in both absolute value and percentage. A €500 line item off by 40% is worth €200 and doesn't matter. An €80,000 line item off by 6% is worth €4,800 and matters a lot.
Setting a threshold — say, variances above 10% and above €1,000 — immediately eliminates most of the pointless conversation.
Rule 2: tell the type of variance apart
Not every variance means the same thing:
- Timing variance. The expense was planned, it just landed in a different month. Not a problem, just monthly-allocation noise.
- Volume variance. You sold more, so direct costs rose. Healthy, and needs no action, as long as margin holds.
- Price or efficiency variance. The same volume cost more. This is the only one that needs explaining and acting on.
Mixing the three up is what leads management to worry about the wrong variance.
Rule 3: year to date, not a single month
A single month is misleading. What matters is the year-to-date figure against the year-to-date budget, because timing variances cancel out and the structural ones become visible.
A line item running 3% over on a six-month year-to-date basis has a real problem. The same line item 25% over in a single month might have none.
The thirty-minute meeting
With these three rules, the monthly review fits into half an hour: five to eight material variances, classified by type, with a decision attached to each of the price or efficiency ones.
It's also the right moment to update the cash flow forecast, because a confirmed variance in overhead changes the next three months, not just the one that's passed.
When to rebudget
Rarely. Rebudgeting every time there's a variance destroys the point of the comparison, because there's always then a budget that matches reality — and a budget that's never wrong tells you nothing.
A formal revision is justified when something structural happens: losing a client who accounts for over 10% of revenue, an unplanned hire, an approved investment. Outside of that, keep the original document and explain the variance.