What is the CAC payback period?
CAC payback period is the number of months it takes for a new customer's gross-margin-adjusted recurring revenue to repay what it cost to acquire them. It is calculated as customer acquisition cost divided by monthly recurring revenue per customer multiplied by gross margin, and shows how quickly growth spending comes back as cash.
CAC payback formula
This is the version David Skok uses for "months to recover CAC" in SaaS Metrics 2.0. Using gross margin matters: the part of each euro that pays for hosting and support can't repay acquisition.
Worked example
- Fully loaded CAC: €1,200
- Average new customer pays €150 a month; gross margin is 80%, so €120 a month is available to repay CAC.
- CAC payback = €1,200 ÷ €120 = 10 months.
If the same customer paid €100 a month, payback would stretch to 15 months. If CAC fell to €600 through a better-converting channel, it would drop to 5.
CAC payback benchmarks
- David Skok's guideline was to recover CAC in 12 months or less, with many of the best SaaS businesses doing it in 5–7 months. He has since added that around 20 months is common among healthy SaaS businesses, and that above 24 months you should work to improve it.1,2
- Aleph and Benchmarkit's 2026 benchmarks (full-year 2025 data) put the median B2B SaaS payback at 16 months, with the top quarter at 6 months or less — and 11 months for companies with ACV under $5K.3
Payback naturally lengthens as ACV rises: enterprise motions can carry longer paybacks because contracts are longer and customers expand. Don't apply small-business payback rules to enterprise deals, or the reverse.
Why it matters from €0 to €1M ARR
- Pre-revenue to 10 customers: not meaningful — acquisition is founder time, and prices are still moving.
- Around €10k MRR: calculate it per channel. It's the number that tells you which channel can scale.
- €50k+ MRR: it's the capital-efficiency metric to watch, together with net revenue retention. Unlike LTV:CAC, it needs no churn assumption, so it works with only a few months of data.
Common CAC payback mistakes
- Leaving out gross margin. At an 80% gross margin, it makes payback look 20% shorter than it is.
- Using ad-only CAC. Payback on a CAC that excludes salaries is fiction.
- Blending organic and paid customers. Word-of-mouth customers with near-zero CAC hide an expensive paid channel.
- Confusing cash with revenue. Annual prepayment gets cash back on day one, but it doesn't change the unit economics.
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Who wrote this
Madalena Rugeroni built Mazo. She's an ex-Googler, a startup advisor and investor, and runs a portfolio of internet companies. Before that, as Head of Growth at Amplemarket, she scaled a B2B SaaS to $10M ARR. LinkedIn
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- Months to recover CAC formula and the 12-month / 5–7 month guidance: David Skok, "SaaS Metrics 2.0 – A Guide to Measuring and Improving what Matters", forEntrepreneurs
- Updated guidance of around 20 months common, improve above 24: David Skok, "SaaS Metrics 2.0 – Detailed Definitions", forEntrepreneurs
- 16-month median, top quartile ≤6 months, 11 months under $5K ACV: Aleph and Benchmarkit, "CAC Payback Period Benchmarks for SaaS (2026)"