---
title: "CAC payback period: formula, worked example and 2025 benchmarks"
description: CAC payback period is the months of gross profit needed to earn back the cost of winning a customer. The formula, a worked example and 2025 medians.
---

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 October 20, 2026

# CAC payback period: formula, worked example and 2025 benchmarks

![Picture of Rishabh Gupta](https://roasexpert.com/hs-fs/hubfs/IMG_1011.jpeg?width=50&name=IMG_1011.jpeg) [Rishabh Gupta](https://roasexpert.com/blog/author/rishabh-gupta)

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By Rishabh Gupta, founder of ROAS Expert. Last updated 20 October 2026.

CAC payback period is the number of months of gross profit it takes to earn back what you spent to win a customer. The formula is sales and marketing spend divided by the monthly gross profit the new customers bring in. Across 198 B2B software companies that reported full-year 2025 numbers to Benchmarkit and Aleph, the median was 16 months. Whether 16 is good for you depends on your deal size, your gross margin and how long customers stay, and we work through all three below.

In short

- CAC payback (months) = sales and marketing spend ÷ (new MRR from new customers × gross margin)
- The 2025 median across 198 B2B software companies was 16 months. Fast growers and sub-$5K products sit near 10, enterprise deals near 22
- Skip the gross margin adjustment and the answer is a quarter shorter at 80% margin and up to half at AI-style margins
- Payback has to be well under a third of average customer lifetime, or growth just buys churn

**16**months, median CAC payback on 2025 actualsBenchmarkit and Aleph, 198 companies

**10**months for companies growing over 50% a yearsame report

**22**months for $50K to $100K contractssame report

On this page

1. [The CAC payback formula](https://roasexpert.com/blog/cac-payback-period-formula#the-cac-payback-formula)
2. [What goes into CAC](https://roasexpert.com/blog/cac-payback-period-formula#what-goes-into-cac)
3. [A worked example (illustration)](https://roasexpert.com/blog/cac-payback-period-formula#a-worked-example-illustration)
4. [What the 2025 benchmarks say](https://roasexpert.com/blog/cac-payback-period-formula#what-the-2025-benchmarks-say)
5. [Why there is no single good number](https://roasexpert.com/blog/cac-payback-period-formula#why-there-is-no-single-good-number)
6. [How to set your own target](https://roasexpert.com/blog/cac-payback-period-formula#how-to-set-your-own-target)
7. [How to shorten it, ordered by impact](https://roasexpert.com/blog/cac-payback-period-formula#how-to-shorten-it-ordered-by-impact)
8. [CAC payback vs LTV:CAC vs CAC ratio vs magic number](https://roasexpert.com/blog/cac-payback-period-formula#cac-payback-vs-ltv-cac-vs-cac-ratio-vs-magic-number)
9. [Where ROAS Expert fits](https://roasexpert.com/blog/cac-payback-period-formula#where-roas-expert-fits)
10. [Questions](https://roasexpert.com/blog/cac-payback-period-formula#questions)

## The CAC payback formula

The version most investors and finance teams use is adjusted for gross margin:

**The formula, gross margin adjusted**

**Sales and marketing spend**in the period, fully loaded

÷

**New MRR × gross margin**new customers only, no expansion

\=

**Payback**in months

Monthly gross profit from the new cohort is what repays acquisition cost. Per customer: CAC ÷ (ARPA per month × gross margin) gives the same answer.

CAC payback (months) = sales and marketing spend in the period ÷ (new MRR from new customers × gross margin %)

If you track ARR rather than MRR, the same thing reads: S&M spend ÷ (new ARR × gross margin %) × 12. Benchmarkit takes the S&M spend from the prior period, on the logic that this quarter's new customers were mostly bought by last quarter's spend. Either convention is fine as long as you keep it.

You will also see the per-customer version: CAC ÷ (average revenue per account per month × gross margin). It gives the same answer, because CAC is just total spend divided by the number of new customers. Use whichever one your data makes easy.

The simpler form, S&M spend ÷ new MRR, skips gross margin. It is quicker and it is always flattering. At 80% gross margin the honest number is a quarter longer than the quick one. At the 50 to 60% margins a16z reported seeing in AI companies, it is between two thirds longer and twice as long. If you run inference costs, use the adjusted formula or you will think you are healthier than you are.

## What goes into CAC

Fully loaded. Ad spend, sales and marketing salaries and commissions, SDR tooling, events, agency and freelancer fees, the CRM, the attribution tool. Divide by new customers won in the period. A paid-media-only CAC is a useful number for the ads team, but it is not the number this metric wants, and a payback period built on it cannot be compared with anyone else's.

Three things to keep out of the numerator and three to watch in the denominator:

- Leave account management and customer success out of CAC. They serve existing customers and belong in cost of revenue or operating expense, depending on your accounting.
- Leave onboarding and implementation cost out of CAC too, but put it in cost of revenue, where it lowers gross margin and lengthens payback the honest way.
- Leave expansion revenue out of the denominator. New MRR means revenue from customers who did not exist last period. Net new MRR mixes in upsells and churn from people you already paid to acquire.
- Use the price customers actually pay. If the first three months are half price, the first three months of gross profit are half as large.
- Use the gross margin of the new customers, not the company blend, when the two differ. A new self-serve tier with heavier support costs pays back slower than the blended number suggests.
- Pick a period long enough to smooth lumpy deals. A quarter works for most companies. A month works for high-volume self-serve.

## A worked example (illustration)

These are hypothetical round numbers, not a client's data.

- Sales and marketing spend in Q2: $300,000
- New customers won in Q2: 60, at an average contract value of $8,000 a year
- New ARR: $480,000, so new MRR of $40,000
- Gross margin: 75%

Monthly gross profit from the new cohort = $40,000 × 0.75 = $30,000. CAC payback = $300,000 ÷ $30,000 = 10 months.

The per-customer route gives the same answer: CAC = $300,000 ÷ 60 = $5,000. Monthly gross profit per customer = $666.67 × 0.75 = $500. $5,000 ÷ $500 = 10 months.

Now the three ways the same company gets a different number:

- Skip gross margin: $300,000 ÷ $40,000 = 7.5 months. Two and a half months better, and wrong.
- Run it as an AI product at 55% gross margin: $300,000 ÷ ($40,000 × 0.55) = 13.6 months. Same customers, same spend, a third longer.
- Count only ad spend of $120,000 as CAC: $120,000 ÷ $30,000 = 4 months. A fine channel metric, not a company metric.

Cash payback is a fourth number. If all 60 customers prepay the year, $480,000 lands in the bank in the quarter you spent $300,000, and the cash payback is immediate even though the accounting payback is 10 months. Both are true. Investors look at the accounting version because it says what the business earns per customer. Your finance lead looks at the cash version because it says whether you can afford to keep hiring. Report both and label them.

**Same company, four answers**

 0481216Gross-margin adjusted (the honest one) Gross-margin adjusted (the honest one): 10 mo 10 moSkip gross margin Skip gross margin: 7.5 mo 7.5 moSame product at 55% AI margin Same product at 55% AI margin: 13.6 mo 13.6 moAd spend only as CAC Ad spend only as CAC: 4 mo 4 mo

 0481216Gross-margin adjusted (the honest one) Gross-margin adjusted (the honest one): 10 mo 10 moSkip gross margin Skip gross margin: 7.5 mo 7.5 moSame product at 55% AI margin Same product at 55% AI margin: 13.6 mo 13.6 moAd spend only as CAC Ad spend only as CAC: 4 mo 4 mo

Hypothetical: $300,000 S&M spend, 60 new customers at $8,000 ACV, 75% gross margin. The red bar is the number to report; the grey one is a channel metric, not a company metric.

## What the 2025 benchmarks say

The most recent large sample is the 2026 SaaS and AI Performance Benchmarks from Aleph and Benchmarkit, published in June 2026 on full-year 2025 actuals from 342 B2B software and AI companies, 198 of which reported CAC payback. The median was 16 months, down from 18 months on 2024 data. The 25th percentile was 10 months and the bottom quartile started at 24 months.

The cuts matter more than the headline:

- By growth rate: companies growing faster than 50% a year had a median payback of 10 months. Companies growing 21 to 30% were at 22 months.
- By deal size: sub-$5,000 ACV companies had a median of 11 months. Companies selling $50,000 to $100,000 contracts had a median of 22 months.
- Horizontal B2B SaaS sat at 14 months, vertical SaaS at 18.

Two older reference points still get quoted. David Skok's SaaS Metrics 2.0 guideline, written in 2011, says months to recover CAC should be under 12, and his later note adds that enterprise businesses with a land and expand model often run around 20. For Entrepreneurs' 2016 survey summary put the implied median at about 18 months on a gross margin basis for companies above $2.5 million in revenue. ChartMogul's metrics library draws the line the same way today: under about 12 months is strong for SMB-focused SaaS, 12 to 24 is typical for enterprise.

**CAC payback by segment, 2025 actuals**

 06121824All companies, median All companies, median: 16 mo 16 moGrowing over 50% a year Growing over 50% a year: 10 mo 10 moGrowing 21 to 30% a year Growing 21 to 30% a year: 22 mo 22 moSub-$5,000 ACV Sub-$5,000 ACV: 11 mo 11 mo$50,000 to $100,000 ACV $50,000 to $100,000 ACV: 22 mo 22 moHorizontal B2B SaaS Horizontal B2B SaaS: 14 mo 14 moVertical SaaS Vertical SaaS: 18 mo 18 mo

 06121824All companies, median All companies, median: 16 mo 16 moGrowing over 50% a year Growing over 50% a year: 10 mo 10 moGrowing 21 to 30% a year Growing 21 to 30% a year: 22 mo 22 moSub-$5,000 ACV Sub-$5,000 ACV: 11 mo 11 mo$50,000 to $100,000 ACV $50,000 to $100,000 ACV: 22 mo 22 moHorizontal B2B SaaS Horizontal B2B SaaS: 14 mo 14 moVertical SaaS Vertical SaaS: 18 mo 18 mo

Medians in months. The 25th percentile across all companies was 10 months and the bottom quartile started at 24. Source: Aleph and Benchmarkit, 2026 SaaS and AI Performance Benchmarks (full-year 2025, 198 companies reporting CAC payback).

High Alpha's 2025 SaaS Benchmarks report, from a survey of more than 800 companies in August and September 2025, called CAC payback and net revenue retention the two strongest predictors of long-term profitable growth. That is the reason the metric sits in every board deck: it is one of the two numbers that actually forecasts whether a software company compounds.

## Why there is no single good number

Payback is a ratio of three things you partly control and one you don't.

Deal size sets the sales motion, and the sales motion sets the cost. A $4,000 self-serve product should pay back in well under a year because nobody expensive touched the sale. A $90,000 enterprise deal carries an account executive, a sales engineer and a six-month cycle, and 22 months can be a healthy result if the customer stays for seven years.

Gross margin sets how much of each dollar counts. A 60% margin business needs a third more revenue than an 80% margin business to recover the same CAC. This is the whole reason AI-native products deserve their own benchmarks and why the formula without the margin adjustment is misleading for them.

Retention sets how long you have. Payback is only safe if it is comfortably shorter than the average customer lifetime. At 2% monthly logo churn the average customer stays about 50 months and a 16-month payback leaves you 34 months of profit. At 5% monthly churn the average customer stays 20 months and the same 16-month payback leaves four. Same metric, completely different business.

**Payback only works against customer lifetime**

 012243648Average lifetime at 2% monthly logo churn Average lifetime at 2% monthly logo churn: 50 mo 50 moAverage lifetime at 5% monthly logo churn Average lifetime at 5% monthly logo churn: 20 mo 20 moA 16-month payback A 16-month payback: 16 mo 16 mo

 012243648Average lifetime at 2% monthly logo churn Average lifetime at 2% monthly logo churn: 50 mo 50 moAverage lifetime at 5% monthly logo churn Average lifetime at 5% monthly logo churn: 20 mo 20 moA 16-month payback A 16-month payback: 16 mo 16 mo

Lifetime in months is roughly 1 ÷ monthly logo churn. The same payback leaves 34 months of profit in one business and 4 in the other.

Capital is the one you don't control. When rounds were easy, a long payback was fundable because the next round covered the gap. When they are slow, the same payback is a cash problem. Our read of the Benchmarkit move from 18 to 16 months is that it reflects spend discipline more than a sudden gain in sales skill, and the growth-rate cut supports that: the fastest growers also had the shortest payback.

## How to set your own target

The rule

Payback should be under a third of expected customer lifetime. Above half, you are paying to acquire customers who leave before they turn a profit, and no growth rate fixes that.

*Step 01***Compute the honest number**

Fully loaded S&M, new-customer MRR only, your real gross margin, a full quarter. Write down the inputs so the next person can reproduce it.

*Step 02***Compare it to customer lifetime**

Average lifetime in months is roughly 1 ÷ monthly logo churn. Keep payback under a third of that.

*Step 03***Compare it to the benchmark for your deal size**

Sub-$5,000 ACV against 11 months, mid-market against 14 to 18, $50,000-plus against 22. A few months worse than median is a plan, not a crisis.

*Step 04***Compare it to cash**

Runway in months ÷ payback months is how many acquisition cycles you can fund. Under two, payback is your most important metric this year.

*Step 05***Set a band and a direction**

A ceiling you will not cross, a target for the year and a quarterly direction. For the example: ceiling 15, target 10, down one month a quarter through pricing and conversion.

## How to shorten it, ordered by impact

- Price. Every dollar of ACV goes straight into the denominator. A 15% price increase on new deals, with no change in close rate, cuts a 16-month payback to about 14. Nothing else on this list is as cheap. See [how to price an AI product](https://roasexpert.com/blog/pricing-an-ai-product) for the packaging side.
- Gross margin. Vendor negotiations, model routing, caching, cheaper tiers for low-value tasks. For AI products this is often the second-biggest lever and the least discussed.
- Channel mix. Blended payback hides a 5-month channel and a 30-month channel. Compute it per channel, move budget toward the short one and set a kill rule for the long one. Our [B2B pipeline guide](https://roasexpert.com/blog/b2b-pipeline-for-saas) covers the per-channel setup.
- Conversion. Doubling trial-to-paid halves CAC with the same spend. Activation work usually beats more top of funnel.
- Sales cycle. Each month you cut from the cycle is a month of salary that stops accruing to the deal.
- Annual prepay. It does not change accounting payback, but it moves cash payback to day one, which buys you time to work on everything above.

## CAC payback vs LTV:CAC vs CAC ratio vs magic number

| Metric | What it measures | Formula | Guideline |
| --- | --- | --- | --- |
| CAC payback | Time to recover acquisition cost from gross profit | S&M ÷ (new MRR × gross margin) | 16-month median; under 12 strong for SMB |
| LTV:CAC | Lifetime gross profit per dollar of CAC | Lifetime gross profit ÷ CAC | Above 3 (Skok), but needs a churn assumption |
| CAC ratio | Dollars of S&M per dollar of new ARR | S&M ÷ new ARR | 2016 median $1.13 per $1 |
| Magic number | Whether to step on the gas | New ARR this quarter ÷ S&M last quarter | Inverse of CAC ratio, one-quarter lag |

Four metrics that share inputs. Payback is the one that needs no lifetime assumption.

Use payback to decide whether to spend, the per-channel version to decide where, and the [marketing efficiency ratio](https://roasexpert.com/blog/marketing-efficiency-ratio) if you sell to consumers and the word "customer lifetime" makes you nervous.

## Where ROAS Expert fits

Our [product consulting](https://roasexpert.com/product-consulting) work for SaaS and AI startups starts with this arithmetic: the honest payback, the per-channel version and the pricing and activation changes that move it. The [growth marketing](https://roasexpert.com/growth-marketing) retainer then runs acquisition against the band you set, with payback reported monthly by channel. If you want a second pair of eyes on your current numbers first, a [growth audit](https://roasexpert.com/audit) covers it, and [pricing](https://roasexpert.com/pricing) is on the site.

**Want your payback number checked?**

A growth audit works through the honest payback, the per-channel version and the pricing and activation changes that move it. From $1,000.

[Book a 30-minute call](https://roasexpert.com/contact)[See pricing](https://roasexpert.com/pricing)

## Questions

### What is the CAC payback period formula?

Sales and marketing spend in the period divided by the monthly gross profit from the new customers won in that period, where monthly gross profit is new MRR multiplied by gross margin. The result is in months. The per-customer version, CAC divided by monthly gross profit per customer, gives the same answer.

### What is a good CAC payback period?

The 2025 median across 198 B2B software companies in the Benchmarkit and Aleph benchmarks was 16 months. Under 12 is strong for products under $5,000 a year, 12 to 24 is typical for enterprise deals, and anything above half your average customer lifetime is a problem whatever the benchmark says.

### Should CAC payback include gross margin?

Yes. Only the margin left after serving the customer can repay acquisition cost. At 80% gross margin the adjusted figure is 25% longer than the unadjusted one, and at the 50 to 60% margins common in AI products it is roughly 1.7 to 2 times longer.

### Does expansion revenue count in CAC payback?

No. Use new MRR from customers who did not exist in the prior period. Expansion and churn from existing customers belong in net revenue retention, a separate metric.

### How is CAC payback different from LTV:CAC?

Payback is a time measure that needs no assumption about how long customers stay. LTV:CAC is a multiple that depends on a churn estimate. Early-stage companies should lead with payback because their churn history is too short to trust.

[Growth Marketing](https://roasexpert.com/blog/tag/growth-marketing), [Product Consulting](https://roasexpert.com/blog/tag/product-consulting)

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```json
{
  "@context" : "https://schema.org",
  "@type" : "FAQPage",
  "mainEntity" : [ {
    "@type" : "Question",
    "acceptedAnswer" : {
      "@type" : "Answer",
      "text" : "Sales and marketing spend in the period divided by the monthly gross profit from the new customers won in that period, where monthly gross profit is new MRR multiplied by gross margin. The result is in months. The per-customer version, CAC divided by monthly gross profit per customer, gives the same answer."
    },
    "name" : "What is the CAC payback period formula?"
  }, {
    "@type" : "Question",
    "acceptedAnswer" : {
      "@type" : "Answer",
      "text" : "The 2025 median across 198 B2B software companies in the Benchmarkit and Aleph benchmarks was 16 months. Under 12 is strong for products under $5,000 a year, 12 to 24 is typical for enterprise deals, and anything above half your average customer lifetime is a problem whatever the benchmark says."
    },
    "name" : "What is a good CAC payback period?"
  }, {
    "@type" : "Question",
    "acceptedAnswer" : {
      "@type" : "Answer",
      "text" : "Yes. Only the margin left after serving the customer can repay acquisition cost. At 80% gross margin the adjusted figure is 25% longer than the unadjusted one, and at the 50 to 60% margins common in AI products it is roughly 1.7 to 2 times longer."
    },
    "name" : "Should CAC payback include gross margin?"
  }, {
    "@type" : "Question",
    "acceptedAnswer" : {
      "@type" : "Answer",
      "text" : "No. Use new MRR from customers who did not exist in the prior period. Expansion and churn from existing customers belong in net revenue retention, a separate metric."
    },
    "name" : "Does expansion revenue count in CAC payback?"
  }, {
    "@type" : "Question",
    "acceptedAnswer" : {
      "@type" : "Answer",
      "text" : "Payback is a time measure that needs no assumption about how long customers stay. LTV:CAC is a multiple that depends on a churn estimate. Early-stage companies should lead with payback because their churn history is too short to trust."
    },
    "name" : "How is CAC payback different from LTV:CAC?"
  } ]
}
```