Salary Cost Projection by Headcount Plan with Attrition Model

Seed: HeadcountPlan table: Role, StartDate, EndDate, BaseSalary, FTE; AttritionRate cell F1

Implementation Guide

This Excel model projects salary cost over time based on a headcount plan and stochastic attrition assumptions. Represent hires as rows with start/end dates and FTE percentages; use MONTH/DATE serials to expand into monthly timeline via a calendar sheet and SUMPRODUCT or INDEX aggregation to attribute salary to months. Model attrition by applying a probability curve to projected hires: create survival factors (1-attrition)^n for nth month and multiply salary exposure by survival. Include vacancy lag (time to refill) and hiring ramp (partial productivity). Output monthly run-rate, quarterly totals and a sensitivity table toggling attrition, lag, and average salary. This supports workforce budgeting, forecasting OPEX and scenario planning for HR and Finance leaders.

💡 Expert Q&A Insights

Q: \

How do I model promotions with salary increases?\" \"

Q: Add promotion events with effective dates and update BaseSalary in a historical pay table; join via INDEX/MATCH on employee and date.\"\n\"

Can I aggregate by department?\" \"

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