Most revenue shortfalls are decided in the planning room, not the field. If you assign quota to headcount that does not exist yet, or ignore how long it takes new reps to reach full productivity, you will miss the number before the year starts. A sales capacity plan closes that gap by connecting headcount decisions to realistic revenue output.
Step 1: Define Your Capacity Units
Before building any model, agree on what one unit of capacity looks like. This is a fully ramped, fully productive seller at their assigned quota. Every other figure in the model is a fraction of this unit.
Document three baseline inputs:
- Full quota: The annual or quarterly target for a productive rep in each segment or territory tier. - Ramp duration: The number of months from hire to full productivity. This varies by segment. Enterprise reps typically take longer to ramp than mid-market or SMB reps. - Attainment rate at full ramp: The percentage of quota the average fully ramped rep actually achieves. Pull this from the prior four to six quarters. Do not use the top quartile. Use the median.
If you have multiple sales roles (account executives, SDRs, overlay specialists), model each separately. Blending roles produces a number that is accurate for no one.
Step 2: Build the Ramp Curve
A ramp curve converts a new hire into a productive seller over time. The standard approach is to assign a productivity percentage to each month of the ramp period.
| Month in Role | Productivity Factor |
|---|---|
| 1 | 0% |
| 2 | 15% |
| 3 | 30% |
| 4 | 50% |
| 5 | 75% |
| 6+ | 100% |
The ramp curve matters most for capacity planning because a rep hired in Q1 contributes differently to Q1 revenue than to Q3 revenue. A plan that counts new hires at full quota from their start date overstates capacity.
Step 3: Model Starting Headcount and Attrition
Start with your current productive headcount, meaning reps who are fully ramped today. Then apply an attrition assumption across the planning period.
Attrition has two components:
- Voluntary attrition: Reps who resign. Use your trailing 12-month voluntary attrition rate, segmented by tenure band if your data allows. - Involuntary attrition: Reps who exit due to performance. This is harder to predict but should not be set to zero. Review how many performance exits happened in the past year.
For each quarter, subtract the attrited headcount from your productive pool. Each departure creates a capacity hole that takes the ramp curve duration to refill.
Step 4: Layer In Planned Hires
Bring in your hiring plan. For each planned new hire, apply the ramp curve to calculate their productive capacity contribution by quarter.
The key question: when do hires need to start to be productive by the quarter you need them? Work backward from your revenue target.
If you need a rep fully productive in Q3, and your ramp is six months, they need to start no later than Q1. If your hiring plan has them starting in Q2, you have a gap.
This is where the model earns its keep. It forces the conversation about hiring lead times before the year is underway.
Step 5: Calculate Total Productive Capacity by Quarter
For each quarter, sum the productive capacity from three pools:
1. Fully ramped reps who started before the plan period and did not attrite. 2. Previously hired reps who complete their ramp during the period. 3. New hires added during the period, weighted by their ramp curve position.
Apply your attainment rate to convert quota into expected revenue. If you have a pool of productive sellers collectively carrying a certain quota total, multiply by your median attainment rate to get realistic expected revenue.
The output is a quarterly capacity number that reflects what your team will realistically produce, not what they are theoretically assigned.
Step 6: Identify the Capacity Gap
Compare quarterly capacity to quarterly revenue targets. The gap between them is what you need to close. Options include accelerating hiring, adjusting quota, improving attainment through enablement, or revising the revenue target downward.
The capacity gap is also a conversation starter with finance. A defensible plan shows the math: exactly when a hire needs to start to hit a given number.
See the related glossary entries for deeper definitions: sales capacity planning and sales capacity gap. For quota inputs to the model, see quota ramp schedule.
Common Mistakes
Using offer date instead of start date. Capacity starts accumulating from the day a rep begins, not when they accept the offer. The lag between offer and start can be weeks. Ignoring in-year attrition. Plans that model headcount as static overstate capacity. Apply attrition quarterly, not as an end-of-year adjustment. Using top-quartile attainment. Modeling to your best reps makes the plan look achievable on paper. It will not hold in practice. Use the median. Treating all segments identically. Enterprise and SMB reps have different ramp durations, quota levels, and attainment patterns. Blend them and your segment-level hiring decisions will be wrong. Building the model once. A capacity plan is not a budget document. Rerun it each quarter with actual attrition and hire dates.Frequently Asked Questions
What is a sales capacity plan?
A sales capacity plan is a model that calculates how much revenue your current and future sales headcount can realistically produce, accounting for ramp time, attrition, and quota attainment rates. It answers whether you have enough productive sellers to hit your revenue target.How far out should a sales capacity plan project?
Most capacity plans project 12 months ahead, with quarterly breakpoints. Finance typically wants an annual view for headcount budgeting, while sales leadership needs the quarterly view to time hiring decisions against ramp curves and attrition risk.What is the difference between capacity and quota?
Quota is the revenue target assigned to a rep. Capacity is the revenue a rep can realistically produce given ramp time and historical attainment rates. Capacity is almost always lower than quota, and the gap between aggregate capacity and aggregate quota reveals the buffer, or lack of one, in your plan.Frequently Asked Questions
What is a sales capacity plan?
A sales capacity plan is a model that calculates how much revenue your current and future sales headcount can realistically produce, accounting for ramp time, attrition, and quota attainment rates. It answers whether you have enough productive sellers to hit your revenue target.
How far out should a sales capacity plan project?
Most capacity plans project 12 months ahead, with quarterly breakpoints. Finance typically wants an annual view for headcount budgeting, while sales leadership needs the quarterly view to time hiring decisions against ramp curves and attrition risk.
What is the difference between capacity and quota?
Quota is the revenue target assigned to a rep. Capacity is the revenue a rep can realistically produce given ramp time and historical attainment rates. Capacity is almost always lower than quota, and the gap between aggregate capacity and aggregate quota reveals the buffer, or lack of one, in your plan.
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