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Personnel Costs Are the Largest Controllable Cost Block. They Get Planned Coarsely
In many companies personnel costs are the largest controllable cost block. They still get planned remarkably coarsely: last year, plus the pay settlement, plus perhaps a flat uplift.
That comes back to bite as soon as something fundamental changes. A wave of attrition in a key area. A site growing faster than planned. Or a pay settlement above the assumption. Plan only a total line and you see the effect first in the reporting.
Driver models offer an alternative. Workforce planning is a rewarding use case for them: headcount, joiners and leavers, salary bands, attrition by area. These are quantities HR already knows and can connect cleanly.
Done properly, this makes questions simulable that were previously gut feel. What does a hiring freeze really cost, and where does it hurt? How quickly does it even take effect when time to hire is six months? Which pay settlement is still bearable?
Hardly any function has better driver data than HR. Hardly any uses it less for steering.