Most companies hire to quota. The ones who hit plan hire to capacity — accounting for ramp, attrition, and the buffer you can never skip.
| Month | Total Reps | Fully Ramped | Expected ARR | vs Target |
|---|---|---|---|---|
| Mo 1 | 6 | 5 | $3.1M | 102% |
| Mo 2 | 7 | 5 | $3.1M | 105% |
| Mo 3 | 8 | 5 | $3.1M | 105% |
| Mo 4 | 9 | 5 | $3.1M | 105% |
| Mo 5 | 10 | 6 | $3.1M | 105% |
| Mo 6 | 11 | 7 | $3.1M | 105% |
| Mo 7 | 12 | 8 | $3.1M | 105% |
| Mo 8 | 13 | 9 | $3.1M | 105% |
| Mo 9 | 14 | 10 | $3.1M | 105% |
| Mo 10 | 15 | 11 | $3.1M | 105% |
| Mo 11 | 16 | 12 | $3.1M | 105% |
| Mo 12 | 17 | 13 | $3.1M | 105% |
Sales capacity modeling is the bridge between your revenue target and your hiring plan. Without a rigorous model, you're either over-hiring — burning cash on reps who can't be covered by pipeline — or under-hiring, watching your ARR target become mathematically impossible in Q3. The inputs that matter: total ARR target, current headcount, quota per rep, ramp time, attrition rate, and productivity at full ramp. Get any one of them wrong and your hiring plan falls apart the moment finance presses you on it.
The key insight: effective capacity is not just headcount × quota. A team of 10 reps with 20% annual attrition and a 4-month ramp is closer to 8 effective reps at full productivity. Model quarterly, not annually — a rep hired in Q1 contributes very differently than one hired in Q3. Ramp months matter enormously: 4 months of ramp on a 12-month year means 33% of the year is at sub-quota productivity. World-class SaaS companies plan 12–18 months of hiring lead time to hit their 24-month ARR targets. If you're starting the hiring conversation when you feel the gap, you're already 6 months late.
The process of modeling how much revenue your current and future sales team can generate, accounting for ramp time, attrition, and productivity curves, to determine exactly how many reps to hire and when.
Effective capacity = (Current Reps × Avg Productivity%) + (New Hires × Ramp-Adjusted Productivity%) − (Attrition × Avg Productivity%). This gives you the revenue your team can realistically generate vs. your target.
6–9 months minimum for quota-carrying AEs, given typical ramp times of 3–5 months plus recruiting lead time of 6–10 weeks. If you need a rep producing in Q4, you should be sourcing candidates in Q1–Q2.
During ramp (typically months 1–4), assume 25–40% of full quota productivity. Months 5–6: 60–75%. Full productivity from month 7 onward. These numbers vary by deal complexity — enterprise sales may take 9–12 months to full ramp.
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