Your CEO hands you the headcount plan: "We hit 240 people by year-end, up from 200." You squeeze it a quarter later: you executed 215. Good result or bad? Without the cascade — start at 200, lose 18 to attrition, backfill 16, add 18 new = real target of 216 — the question has no answer. The "240" number in the original plan was simultaneously a promise to the team, a market signal, and a $4M cost decision. And nobody decomposed it.
This happens because headcount planning is done on a single number instead of a cascade. The cascade makes explicit what fraction is REPLACEMENT (non-negotiable, just maintains status quo) vs REAL GROWTH (the only discretionary lever, where strategy is decided). Without that decomposition, every quarterly conversation about "can we make one more hire?" happens over noise — because nobody knows if that hire is replacement of a departure or real growth.
In this module you learn to plan headcount as a system, not a number. The Starting → Attrition → Backfills → Net New cascade, the net-new allocation BY FUNCTION as the real strategic decision, and the comp envelope that captures both new hires and merit pool — that second half of the cost which is almost always underestimated.
Let's go.
Your CEO says: "Approve 30 net-new hires for next year, we're going for aggressive growth." What do you ask BEFORE approving?
In plain language
Before the mechanics, the four basic questions.
Why do this at all?
Because headcount is typically 60-80% of operating cost in services companies and 20-40% in industry. It's the largest capital allocation decision you make every year, and it's almost always done on an aggregated number without decomposition. The cascade lets you distinguish replacement (mandatory, non-strategic) from growth (discretionary, where the real bet lives), and the comp envelope makes total cost explicit — not just new hires but also the merit pool over existing payroll, which is almost always larger than recognized.
Who builds it and who uses it?
FP&A builds the cascade with HR data (historical attrition, salaries by function, merit pools). Each function head — Commercial, Product, Operations — proposes their net-new with revenue/productivity justification. CFO challenges proposals and consolidates the comp envelope. CEO approves the aggregate. Board reviews only the summary. Without the cascade, the CEO-to-function-head conversation is "I need 10 hires" — context-free. With the cascade, it's "of the 10, 4 are replacement of my expected attrition and 6 are growth — and the 6 generate revenue X per person in 12 months."
When does it show up?
In annual planning (October-November of the previous year). Quarterly for reforecast — actual attrition rarely matches plan. Before every incremental hire decision during the year — "can we make one more hire?" only has a defendable answer with the updated cascade. And critically: when there's annual comp review (Q1 typically) — the merit pool is a decision that affects the comp envelope as much as new hires.
What if we never model it?
Three patterns: (1) Approve aggressive plan in planning, execute 60-70%, end up with worst combination: cost of the promise (market signals, internal expectations, comp adjusted to "attract" promised talent) without effective capacity. (2) Underestimate attrition. Real turnover is usually 12-18% in LATAM, not the optimistic 8% in plan. That means planned "net-new" is really 50% lower in aggregate capacity after replacement. (3) Ignore merit pool in cost conversation. A 4% merit pool on $20M payroll = $800K — equivalent to 8 annualized hires. The quarterly conversation of "can we make one more hire?" ignores that structural figure.
Andina S.A. — the plan of 240 that ended at 218
Andina closes fiscal year with 200 employees. For next year, executive committee approves aggressive plan: 240 by year-end, 20% HC growth. CEO presents to board as "ambition signal." Estimated comp envelope: $4M incremental.
CFO looks at the numbers and asks for explicit cascade. Analysis reveals: historical attrition 9% — over 200 = 18 expected departures. Of the 40 "hires" in the plan, 18 are replacement and only 22 are real net-new. The conversation changes. "20% HC growth" is really "11% HC growth + replacement."
By function: 22 proposed net-new are distributed 12 Commercial, 6 Product, 3 Operations, 1 Support. CFO asks: do we assume 22% revenue growth so revenue/employee ratio is maintained? Commercial says "we assume 18%." There's a gap. The discussion gets concrete: either reduce net-new to 16 (consistent with 18% revenue growth), or reforecast revenue to 22% with defendable commercialization plan.
Committee adjusts: 18 final net-new (vs 22 proposed). 12 Commercial, 4 Product, 2 Operations, 0 Support. Comp envelope plan: $1.8M net-new + $700K merit pool (3.5% on $20M payroll) = $2.5M incremental, vs the original $4M.
Year-end execution: real attrition was 22 (vs 18 expected — high turnover in Commercial). Replacement consumed 22 hires. Net-new executed was 18 per plan. Year-end headcount: 218 (vs target 218 = exact). Without the cascade, the CEO would have reported "we executed 218 vs 240 target, 9% deficit." With the cascade, they report "we executed 18 net-new vs 18 plan = 100% — and absorbed +4 turnover without extending deadlines." Same reality, structurally different narrative.
Following year, Andina enters planning with cascade as standard template. Executive committee no longer approves aggregated numbers — they approve (a) net-new by function with revenue thesis, (b) merit pool with retention thesis, (c) assumed attrition with mitigation plan. Three explicit decisions vs one opaque decision.
The visual below lets you explore 3 scenarios — Conservative, Base, Aggressive — and see how the comp envelope changes with each.
Headcount cascade, live
Three scenarios. For each: the Starting → Attrition → Backfills → Net New → Target cascade, the net-new allocation by function, and the comp envelope with year-1 incremental cost.
The critical experiment: alternate between Conservative and Aggressive. The cascade visually reveals that much of the "growth" in aggressive plans is replacement, not real growth. And look at the comp envelope: the merit pool over existing payroll can be as large or larger than net-new — and almost no one discusses it in the quarterly hire conversation.
Interactive visual
Headcount cascade · from plan number to real cost
Planning headcount on a single number hides the real decision. The Starting → Attrition → Backfills → Net New cascade reveals what fraction of the budget is replacement (non-negotiable) vs growth (the only discretionary lever). Then the comp envelope shows total plan cost.
Net-New allocation by function
- Commercial8 (44%)
- Product / Tech5 (28%)
- Operations3 (17%)
- Support2 (11%)
Compensation envelope
| Incremental cost net-new (annualized) | $1.80M |
| Incremental cost merit raises (existing) (3.5%) | $0.70M |
| Total incremental cost year 1 | $2.50M |
| Payroll growth vs previous year | +12.5% |
CFO's read
Base plan: 18 net-new (9% growth). Assumes revenue growing 10-12%. If revenue decelerates to 5%, this plan leaves expensive excess capacity to reverse.
What you are seeing
Four lessons: (1) The cascade makes explicit the difference between replacement (mandatory) and growth (discretionary). In the Base scenario, 16 of 34 hires are replacement — that's not growth, it's maintaining status quo. (2) The net-new allocation by function IS the strategy. Putting 8 in Commercial = bet on revenue expansion. Putting 10 in Product = bet on roadmap. Every headcount plan is a strategic decision disguised as a number. (3) The comp envelope grows for TWO reasons: net-new (visible) and merit raises (invisible but big). A 4% merit pool on $20M payroll = +$800K. The quarterly conversation of "can we make one more hire?" ignores that the merit pool is already eating $800K. (4) The universal mistake is approving aggressive plan at planning, executing 60%, and living with the worst combination: the cost of the promise (market signals, internal expectations) without the capacity. Better to approve a smaller and consistent plan.
The critical reading of the visual: the aggregate "headcount target" is misleading. Conservative 188 + replacement + 6 net-new vs Aggressive 200 + replacement + 35 net-new. The REAL difference is not "188 vs 235" — it's "6 vs 35 net-new." Almost an order of magnitude difference in the strategic decision, hidden in the aggregate.
Second reading: the allocation by function IS the strategy. If you put 14 of 35 net-new in Commercial (40%), you're betting on revenue expansion — you need a solid thesis on the deal volume those 14 generate. If you put 10 in Product (28%), you're betting on roadmap — you need a thesis on what features you ship and what revenue they enable. Each function should defend its slice with an explicit revenue/productivity thesis; without that, allocation becomes internal politics.
And critical: the comp envelope grows for TWO reasons. Net-new is visible. The merit pool is invisible but big — 3-4% on existing payroll can equal the cost of 8-10 net-new hires. Any quarterly conversation about hires that doesn't count the merit pool underestimates total cost. The CFO rule: every hire decision must pass through the total comp envelope, not just the individual's cost.
The mechanics: how to plan headcount as a system
- Start with the cascade, not with the target. Four lines: Starting (real, not aspirational), Attrition (based on historical of last 24 months, not optimism), Backfills (assume 80-100% replacement — those not replaced are explicitly declared savings), Net New (the only strategic decision). The target falls out of the sum — it's not decided independently.
- Attrition is modeled by function and tenure. Salespeople turn over more than finance. Year 1 more than year 5. Without segmenting, the aggregate average hides functions where turnover is 25% — and if it's Commercial, that destroys the revenue plan.
- Net-new allocation by function IS the strategy. Each function head presents thesis: "10 net-new in Commercial = +$8M year-1 revenue at $400K/quota × 60% ramp." Without that thesis, allocation becomes political negotiation. With the thesis, the head commits to delivery — and if they don't deliver, there's clear accountability.
- The comp envelope captures TWO things: net-new + merit pool. Net-new = new hires × fully-loaded average salary (includes bonus, benefits, equity, overhead allocations — typically 1.4-1.6x base salary). Merit pool = % over existing payroll, distributed differentially (top performers 6-10%, mid 3-4%, low 0-2%). Without differentiation, merit pool destroys performance signal.
- Reforecast quarterly, not just annually. Real attrition rarely matches plan. If by Q1 you've already lost 8 (vs 4 expected), the plan needs adjustment before it accumulates in H2. The cascade becomes alive; each quarter updates with actuals and revised forecast.
- Differentiate "approved hires" from "filled hires" in every report. Approving 20 net-new in planning vs filling 12 in execution are very different situations — and they get reported to the board as if they were the same. Transparency: "20 approved, 14 with offer extended, 12 signed, 8 onboarded contributing."
- Headcount is asymmetric — easier to add than to reduce. Adding 10 = weekly decision. Reducing 10 = cultural trauma, legal cost, hit to morale. That asymmetry forces conservative planning in uncertainty years. Better to execute excess demand with overtime and consultants than with permanent hires you can't adjust later.
- Attrition (turnover). Voluntary and involuntary departures in the period. Historical = best predictor; aspirational = mistake. LATAM mid-market typical: 10-18% annual; Commercial 20-30%; Tech 15-25%.
- Backfill (replacement). Hire to replace a departure. Generally requires same salary level; "savings from not replacing" must be an explicit decision, not implicit.
- Net new. Hire that increases aggregate capacity. The only discretionary lever in the plan. Net-new allocation by function is the real strategic decision.
- Fully-loaded cost. Total employee cost: base salary + bonus + benefits + employer taxes + equity (if applicable) + overhead allocations (space, equipment, IT). Typically 1.4-1.6x base salary. It's the number that goes into the comp envelope.
- Merit pool. Budget for salary increases to existing employees based on performance. % over payroll. Differentiated by performance rating: top 6-10%, mid 3-4%, low 0-2%. Without differentiation, no signal — everyone takes 4%.
- Comp envelope. Total year-1 incremental comp cost: net-new (annualized) + merit pool. Captures total cost of headcount and comp combined plan.
- Ramp. Time between hire and full productivity. Salesperson: 6-9 months for full quota. Engineer: 3-6 months. Effective plan capacity is 50-70% of planned headcount in year 1.
- Practical rule: plans assuming 100% hire execution + 100% immediate productivity overestimate real capacity by 30-40%. Conservative on HC, aggressive on ramp, is the combination that delivers.
Adversarial check
Quiz
Adversarial check
Your CEO hands you a plan: "240 people by year-end, up from 200." What decomposition do you ask BEFORE approving?
Your approved plan: 20 net-new, 14 in Commercial, 4 in Product, 2 in Operations. Q1 closes with 4 hires total executed — all in Product/Ops. What is the right answer?
Why is differentiated merit pool (top 6-10%, mid 3-4%, low 0-2%) better than uniform merit (everyone 4%)?
Exit checklist
Checklist
Mark what you already understand. Come back if anything remains open.
Suggested re-review: quarterly with attrition reforecast. Annual with planning. And before any public communication on "aggressive expansion" — the public plan must equal executable reality, not aspiration.
Sources
The quantitative claims and frameworks in this module are grounded in the following sources. Each points to a curated source entry where the working summary and original PDFs live.
- 1Mauboussin & Callahan — Capital Allocation (2025 edition) — Headcount is the single largest annual capital allocation in services-heavy businesses (60-80% of opex). The 2025 edition introduces "Investment SG&A ex-R&D" as a distinct mechanism — backs the module's framing that the headcount-plan decision is not budgetary but strategic, and that a differentiated merit pool is the discipline of allocating human capital.Source:
international/mauboussin-capital-allocation.md·mauboussin-capital-allocation-2025.pdf - 2Damodaran — Employee Stock Options and Restricted Stock: Valuation Effects (2005) — Valuation treatment of equity comp inside fully-loaded cost — Damodaran shows that omitting or under-valuing the equity component systematically understates personnel cost. Backs the 1.4-1.6× base-salary multiplier and the discipline of including RSUs and options in the comp envelope.Source:
international/damodaran-corporate-finance.md·ssrn-841504.pdf
Optional
Go deeper
Sources and books to dig into the original material