GTM Fundamentals · intermediate · node 5.3

CAC (fully loaded)

CAC = (Sales + Marketing spend, fully loaded) / (Customers acquired in that period). Fully loaded includes salary, commission, benefits (~30% overhead), tooling (CRM, Slack, marketing automation), and allocated manager/ops/finance overhead. A sales rep at $200k all-in spend over 12 months who closes 2 deals has a CAC of $100k per deal. Ignore the 'fully loaded' caveat and CAC looks artificially cheap, hiding the truth that you're losing money on low-ACV customers. CAC ≤ ACV/3 is the classic rule of thumb: if ACV is $100k, CAC should be ≤$33k to leave room for delivery, support, and profit. CAC > ACV/3 means LTV:CAC < 3:1, a losing unit economics profile.

intermediate Last updated 2026-06-25

Prerequisites

Unit economics fundamentalsCAC payback period

Customer acquisition cost (CAC) is the total cost to acquire one customer.

CAC = (Sales + Marketing spend, fully loaded) / (Customers acquired)

Fully loaded means:

Sales rep salary: $150k
Commission: $80k–$150k
Benefits (health, 401k, taxes): 30% = $69k
Manager allocation: 20% of manager salary = $30k
Tools (CRM, Slack, Zoom): $5k
Facilities, equipment: $10k

Total per rep: ~$350k/year. If that rep closes 2 deals, each deal has a CAC of $175k, not the $80k commission shown on a spreadsheet.

SLG CAC: $30k–$200k per deal (depends on ACV and sales efficiency). PLG CAC: $500–$5k per customer (usage-based, not person-based). Partner/marketplace CAC: $1k–$10k per customer (partner commission + enablement).

The CAC rule of thumb: CAC ≤ ACV / 3.

If ACV is $100k, CAC should be ≤$33k. Why? Because gross margin on software is typically 70–80%, and the other 30% of revenue goes to delivery, support, and profit. If you spend $50k (CAC) to close a $100k deal, your margin after delivery is 20%, leaving nothing for overhead, R&D, or profit.

If CAC > ACV / 3, your unit economics are broken: LTV:CAC < 3:1 (the minimum viable ratio). You are losing money until the customer renews.

CAC payback period = months to recoup CAC from gross margin.

SLG deal at $100k ACV, 75% gross margin, 1-year term: Gross profit = $75k/year. CAC payback = $100k / ($75k/12) = 16 months. That means 16 months until the sales spend is recouped.

Long payback periods are OK for enterprise (you will get 3–5 year lifetime), but they require deep pockets (venture capital or profitable prior business) to sustain.

CAC improves over time as:

Sales reps get better (higher close rate)
Product gets better (shorter sales cycle)
Market awareness grows (shorter education cycle)
Brand improves (inbound leads replace cold outreach)

Key takeaways

CAC = (fully loaded sales + marketing spend) / (customers acquired). Fully loaded means salary, benefits, tooling, overhead.
CAC rule of thumb: CAC ≤ ACV / 3. If CAC exceeds this, unit economics are broken.
CAC varies by motion. PLG CAC is $500–$5k per customer; SLG CAC is $30k–$200k per deal.
CAC payback period = months to recoup CAC from gross profit. SLG payback is 6–18 months; PLG payback is 3–6 months.

Related concepts

LTV:CAC ratioMagic numberSales-led motion

How to cite this

@misc{shalvi_gtm_fundamentals_fully_loaded_cac_2026,
  author = {Singh, Shalvi},
  title  = {CAC (fully loaded)},
  year   = {2026},
  url    = {https://shalvisingh.com/gtm/fundamentals/fully-loaded-cac},
  note   = {GTM World Model — GTM Fundamentals}
}

Singh, Shalvi. "CAC (fully loaded) — GTM Fundamentals." shalvisingh.com, 2026. https://shalvisingh.com/gtm/fundamentals/fully-loaded-cac