How many months until each cohort pays back their acquisition cost?
№ 012 · CAC payback curve
Definition
MetricMonths of gross profit to recover fully loaded CAC, by cohort
Unitmonths to 1.0x recovery
X-axis is months since acquisition, y-axis is cumulative gross profit divided by CAC. Break-even line at 1x marks payback. One line per cohort or segment. Build by tracking each cohort's cumulative gross profit (revenue x gross margin) against fully-loaded CAC. Example: SMB crosses 1.0x at M8, Enterprise at M19.
- CAC
- Customer acquisition cost. Fully loaded sales and marketing spend in a period divided by new customers won in that period.
- SMB
- Small and medium business. Segment label, usually under 200 employees or a defined contract-value band.
Benchmarks
| Bottom 30% | Median | Top 30% |
|---|---|---|
| 24+ months | 16-18 months | 6-12 months |
Private B2B SaaS, gross-margin-adjusted CAC payback, fully loaded S&M, CY2024-2025 actuals; highly correlated with ACV, so compare within band · Two Benchmarkit-family reads: CY2025 median 16 months (Aleph edition, n=198 reporting) vs 18 months in the 2025 report on 2024 data; payback has risen 12.5% since 2022. Definitions differ on gross-margin adjustment and on whether CS cost is in CAC; understated CAC (excluding founder selling time, CS involvement in deals) is the most common flattering error.
| Category | Bottom 30% | Median | Top 30% |
|---|---|---|---|
| By ACV band | any band: 24-30+ | under $5k: ~9; $50-100k: mid-teens; above $100k: ~24 | under $5k ACV: 6 months or less; $25-100k: under 12 |
When it looks bad
Each newer cohort's curve crosses 1.0x later than the last: the family of curves fans out to the right, meaning acquisition efficiency is decaying vintage by vintage even if the blended number moves slowly.
2023 cohorts paid back at month 14, 2024 at month 19, 2025 tracking to month 25. Blended payback still reads 18 because old cohorts dominate; the forward business is at 25 and the plan assumes 15.
What to do about it
- Always plot payback by cohort, never blended: blended payback lags the truth by 12+ months because healthy old vintages mask decaying new ones.
- Recompute with fully loaded CAC once a year (founder selling time, SE support, allocated CS on pre-sale, tooling); Benchmarkit-linked analysis flags incomplete cost capture as the most common source of a flattering payback.
- Shorten payback with billing structure before touching spend: annual prepay with a modest discount converts a 16-month economic payback into a 1-month cash payback; ChartMogul data shows ~50% of SaaS revenue already on annual plans and month 2-4 as the upgrade window.
- Shift mix toward expansion revenue: blended CAC ratio ($1.40 per new dollar including expansion) runs well below new-logo CAC ($2.00) in Benchmarkit 2025; a 10-point mix shift toward expansion mechanically pulls payback in.
Sources
- Aleph and Benchmarkit Median 16 months; top quartile 6 or fewer; bottom quartile 24+; under 12 months is the self-funding bar getaleph.com ↗
- Benchmarkit CAC payback up 12.5% since 2022; most correlated with ACV; deals above $250k ACV less efficient than $50-100k benchmarkit.ai ↗
- Benchmarkit Median payback 9 months at ACV under $5k vs 24 months above $100k ACV (2023 data) benchmarkit.ai ↗
- G-Squared CFO (reporting Benchmarkit 2025) Industry-wide median payback stretched to 18 months per Benchmarkit's 2025 report; companies pairing high NRR with strong payback grow 71% vs 10% for the weak-weak group gsquaredcfo.com ↗
- ICONIQ Growth CAC payback stabilizing after two years of deterioration, part of the efficiency-led operating transformation iconiq.com ↗
- Orb Median payback ~8 months for early-stage rising to ~20 months for larger companies withorb.com ↗