Vacancy Cost: Measure the Uncovered Work

A vacant role can reduce expense while leaving valuable work unfinished. The useful question is what happens to the workload during the vacancy. Some work moves to other people, some waits, some requires outside coverage, and some sales are lost. Multiplying a salary by an arbitrary vacancy percentage does not explain any of those outcomes.

Map the work before assigning a dollar value

Assume a four-week vacancy leaves 120 productive hours uncovered. Existing staff can absorb 30 hours without extra pay, and an outside provider can deliver 40 hours at a hypothetical $70 per hour. That leaves 50 hours. Of those, 20 can be completed later and 30 relate to customer orders that will be lost if not delivered on time.

If the lost work would have contributed $90 per productive hour after its avoidable variable costs, the contribution at risk is $2,700. Do not use the full customer selling price unless there are genuinely no avoidable variable costs. Revenue lost and profit impact are different quantities.

Reconcile saved costs and coverage

Suppose the vacancy avoids $6,000 of role costs during the four weeks. The narrow modeled operating result is $6,000 − $2,800 − $2,700 = $500 favorable compared with the role being filled. That result does not mean the vacancy is desirable. It omits the opportunity cost of the 30 absorbed hours, the future cost of the deferred work, service effects, and any recruiting expense that differs between scenarios.

Examine the work displaced by the absorbing team. If it is necessary internal maintenance, describe its consequence and later schedule. If it is another customer job, quantify that job's contribution separately without counting the same hour twice. An employee being busy is not sufficient evidence that every reassigned hour causes a lost sale.

Distinguish delay from disappearance

When the 20 deferred hours are recovered next month within existing capacity, revenue timing may change while total contribution over two months remains unchanged. If recovery requires an additional $800 external payment, record that payment. If delayed delivery triggers an actual contractual concession, include its stated amount rather than an invented penalty rate.

Maintain a weekly backlog with due dates, available coverage, and confirmed cancellation decisions. Review the estimate as the vacancy extends: a manageable one-week delay may become lost work after a deadline. The example does not value employee stress, customer loyalty, or future turnover in dollars. Those may matter, but they need separate evidence and should not be hidden inside a fabricated vacancy multiplier.

Method references: BLS: Employer Costs for Employee Compensation concepts. Accessed October 22, 2026. All dollar figures are hypothetical worked examples.