Journal
Setting materiality for operating budget variances
Not every variance deserves a paragraph. If everything is “material,” owners stop answering thoughtfully and finance drowns in noise.
Dual thresholds that work in practice
Many Taiwan mid-market controllers use a dual gate:
- Absolute: e.g. NT$200,000 versus budget for the cost centre line
- Relative: e.g. 8% of that line’s monthly budget
A line enters the narrative pack only if it clears either gate — unless it sits on a watchlist account (safety, scrap, or customer penalties) where a lower absolute threshold applies.
Recalibrate after structural change
After a reorganisation or a large contract win, last year’s thresholds can flood the pack. Revisit materiality when cost centre maps change, not only at fiscal year start.
Document the rule in the close calendar
Write the thresholds on the month-end map so plant managers know which swings need a call. Surprises about “why didn’t you explain this?” usually mean the rule lived only in the controller’s head.