By Shawn Elliott, CFO | High Rock Accounting
All right, let’s talk about the two numbers that should be running your marketing budget in 2026, because most founders I sit down with are flying blind on at least one of them. Customer Acquisition Cost and Customer Lifetime Value. CAC and LTV. If you’re a SaaS founder and these aren’t on your monthly operating dashboard, that’s a problem we need to fix today.
I’ve been in accounting for over 22 years. At High Rock Accounting, we work with tech and SaaS founders from pre-revenue all the way through $50M+ ARR, and I can tell you this: the companies that scaled and survived the last three years are the ones whose CFOs were religious about unit economics. The ones that hit hockey stick growth, raised at sky-high valuations, then quietly went sideways? Almost every single one of them ignored what CAC and LTV were trying to tell them.
The post-ZIRP environment changed the rules. Cheap capital is gone. Investors are no longer rewarding revenue growth at any cost. Bessemer’s 2025 Cloud 100 average ARR multiple sits at 20x, down 41% from the 2021 peak of 34x. *1 Carta’s data shows 2025 venture funding hit $119.5 billion but with just 4,859 rounds, the lowest count in six years. Capital is concentrated, and it’s flowing to companies with squeaky clean unit economics. *2
So let me walk you through how to actually use these numbers to make marketing budget decisions, what the current benchmarks look like, and where I see founders make the most expensive mistakes.
CAC and LTV in Plain English
Customer Acquisition Cost is exactly what it sounds like: how much you spent to land each new customer. Lifetime Value is the total gross profit a customer is going to deliver to you over the time they stay on your platform. The relationship between these two numbers tells you whether your business model works, period.
If LTV is bigger than CAC by a healthy margin, every marketing dollar is making you money. If CAC is approaching or exceeding LTV, you’re literally paying customers to use your product, and no amount of growth is going to fix that. You’re just digging the hole deeper, faster.
Yep, that’s the whole story. Now let’s get into how to calculate these correctly, because I see founders mess this up constantly.
How to Calculate CAC the Right Way
The textbook formula is total sales and marketing spend divided by new customers acquired in the same period. Sounds simple. Here’s where it goes sideways.
First, you need to decide which CAC you’re measuring. There are three that matter, and the difference between them is where most board decks quietly mislead investors.
Paid CAC is just your paid channel spend divided by paid channel customers. This is what you use to optimize individual campaigns.
Blended CAC is all of your sales and marketing costs (including salaries, programs, and tools) divided by all customers acquired, organic and paid. This is the operator’s number.
Fully-Loaded CAC layers in allocated customer success costs, software tools, and overhead. This is the investor-grade number that shows up in your data room.
Use blended for monthly operating reviews. Use fully-loaded when you’re talking to a board or fundraising. Reporting only paid CAC and calling it your CAC is one of the fastest ways to get torched in a Series A diligence call.
Second, you need to handle gross margin. The Bessemer standard formula for CAC payback is prior quarter sales and marketing expense divided by net new MRR multiplied by gross margin. *3 If you’re not multiplying by gross margin somewhere in this calculation, you’re hiding the real cost of the customer because hosting, support, and professional services aren’t free.
Third, sales cycle lag matters. If your enterprise sales cycle is six months, comparing this quarter’s marketing spend to this quarter’s bookings is incoherent. You’re crediting Q4 marketing for closing customers who entered the funnel in Q2. Offset by at least one quarter, longer for true enterprise.
The fourth mistake I see all the time: founders forget to count their own selling time and the cost of unramped account executives. Founder-led sales feel free, but they’re not. If you’re spending 30% of your week on sales calls at a $250K founder salary, that’s $75K of CAC nobody is putting in the model. When the data room hits an investor’s desk, that hole shows up.
Here’s where current benchmarks land. Benchmarkit’s 2025 SaaS Performance Metrics report (covering FY 2024 data) shows the median private SaaS company is now spending $2.00 in sales and marketing to acquire $1.00 of new-logo ARR, up 14% from $1.76 in 2023. *4 That ratio has been getting worse for three years running. The bottom quartile is at $2.82.
CAC also varies wildly by segment. First Page Sage’s 2025 data shows enterprise CAC for fintech SaaS averages $14,772, while SMB fintech is $1,450. Cybersecurity enterprise is $10,221, SMB is $805. *5 If you’re benchmarking yourself against the wrong segment, you’re going to make terrible budget decisions.
How to Calculate LTV the Right Way
LTV is where the math gets really tricky and where I see the most creative fiction in board decks.
The basic formula is average revenue per account multiplied by gross margin, divided by customer churn rate. Same period units throughout. Don’t mix monthly ARPU with annual churn, that’s an instant 12x error. Use gross margin, not revenue. Use revenue churn, not logo churn, because a customer who downgrades from $50K to $5K is not retained in any meaningful sense.
Here’s the issue: when your Net Revenue Retention is over 100% (the so-called negative churn scenario), your churn rate is effectively zero or negative. The formula breaks. LTV becomes infinite on paper, which is obviously nonsense.
What I tell my clients to do: cap useful customer life at 5 to 7 years, or switch to cohort-based LTV that tracks actual cumulative revenue per cohort over time. Either approach gives you a number that’s defensible in front of a board or an investor. The infinite-LTV trick gets you laughed out of the room.
Net Revenue Retention is the single biggest lever in this calculation, and it has compressed across the board. Benchmarkit’s 2025 dataset shows the median NRR is now 101%, down from roughly 105% in 2021. *6 Top quartile sits at 110% to 115%. Gross Revenue Retention, which strips out expansion revenue, has slipped from 90% to 88% at the median over the same period. SaaS Capital’s 2025 survey of more than 1,000 private SaaS companies shows similar median NRR of 101% to 102% across the broader population, with bootstrapped companies at $3M to $20M ARR running 104% NRR. *7
Public SaaS leaders set the upper bound. Snowflake reported 125% NRR in their most recent fiscal year close (Q4 FY26, filed February 2026), holding in a 124% to 126% band across all four quarters of fiscal 2026, per their SEC 8-K filings. *8 Datadog reaccelerated to roughly 120% trailing twelve-month NRR through 2025, up from the high 110s earlier in the year. *9 Klaviyo grew NRR from 108% at FY24 close to 110% by FY25 close, with $200 million of free cash flow on the year. *10 That’s the textbook profile of a healthy SaaS company: high retention, expansion revenue, free cash flow generation, and customers who pay back acquisition twice.
Now here’s the warning shot for AI-native companies. ChartMogul’s 2025 Retention Report (analyzing over 3,500 SaaS companies) found that AI-native companies have median Gross Revenue Retention of just 40% and Net Revenue Retention of 48%. *11 Below $50 a month price points, GRR collapses to 23%. AI is easy to buy and easy to cancel. If you’re a founder building an AI product and your retention curve looks like that, no amount of CAC efficiency is going to save your unit economics.
The Ratios That Should Be Driving Your Budget
Once you’ve got CAC and LTV calculated honestly, two ratios matter for budget decisions.
LTV:CAC ratio. The classic 3:1 rule still holds. Benchmarkit’s 2024 data places the median LTV:CAC at 3.6:1. *12 Under 1:1 is unsustainable. 1:1 to 3:1 is workable but constrained. 3:1 is the venture standard. Above 5:1 might actually mean you’re under-investing in growth and leaving money on the table.
CAC payback period. This is the number of months it takes to recover acquisition cost on a gross-margin basis. In 2026’s cash-constrained climate, I argue this is the more important of the two. The KeyBanc and Sapphire Ventures 15th Annual Private SaaS Survey puts median CAC payback at roughly 20 months, down from about 23 months in 2022 but well above the pre-pandemic 12-to-14-month norm. *13 ICONIQ Capital’s State of Software 2025 report shows top-quartile CAC payback plateauing around 16 months while the median has stabilized in the high teens to low 20s, with Net Dollar Retention settling into a 110% to 120% range across the broader software market. *14 That’s a structural reset, not a blip.
The reason payback period beats LTV: CAC for budget decisions: it’s denominated in cash. When NRR exceeds 100% the LTV calculation gets unstable, and ratios get gamed. Months of payback don’t lie.
Bessemer publishes segment-specific CAC payback targets that I think are the cleanest framework available. *15 Under 12 months for SMB-focused products. Under 18 months for mid-market. Under 24 months for true enterprise. If you’re outside those thresholds, you have a unit economics problem regardless of how fast you’re growing.
The Companies That Got This Wrong
The post-ZIRP graveyard is instructive, and the case studies are recent enough that the details are still public.
Hopin raised over $1 billion and hit a $7.75 billion valuation in August 2021 on a virtual events thesis that depended entirely on pandemic conditions. By August 2023, RingCentral acquired the core Events and Sessions assets for $15 million up front plus up to $35 million in earnouts. *16 The parent entered liquidation in 2024. They scaled marketing spend hard against an LTV that evaporated the moment offices reopened.
Convoy raised approximately $1 billion in cumulative equity and venture debt, hitting a $3.8 billion valuation in an April 2022 round, and shut down abruptly on October 19, 2023, with no severance for most staff. *17 Bezos, Gates, Greylock, and T. Rowe Price were all in the cap table. The marketplace economics never worked. They scaled CAC against unit economics that were structurally upside down.
Olive AI raised approximately $902 million and peaked at a $4 billion valuation in July 2021. They shut down October 31, 2023, after laying off 450 employees the year before and another 200 in February 2023. *18 Healthcare AI is genuinely difficult to sell, and the LTV they were modeling was a hockey stick that never materialized.
Bird hit a $2.5 billion valuation, then filed Chapter 11 in December 2023 with $1.6 billion in accumulated losses. *19 The unit economics on shared scooters never penciled, but they kept scaling spend.
The pattern in every one of these is identical: revenue scaled, but unit economics never did. Marketing was treated as a fundraising story rather than a cash recovery question. When the cost of capital normalized, the companies that had treated CAC payback as a real constraint kept their runway. The ones that hadn’t, didn’t.
Even healthier companies have had to dramatically pull back. Peloton’s Q1 FY25 8-K shareholder letter discloses sales and marketing expense down approximately $64 million year over year, a 44% decline. *20 The company called it the lowest quarter of media spend in years. Toast cut roughly 550 employees in February 2024 with $45 to $55 million in restructuring charges to deliver about $100 million in annual savings. *21 The market is absolutely demanding marketing efficiency right now.
Translating This Into a Marketing Budget
Here’s the framework I use with my clients.
First, calculate fully-loaded CAC payback by segment and channel, every month, with a one-quarter sales cycle offset. Compare to Bessemer’s segment thresholds. Then make decisions.
Where payback is inside your threshold and trending down, accelerate spend in that channel until payback approaches the upper bound. That’s the highest-ROI growth dollar in the business. Don’t leave that money on the table.
Where payback is outside threshold and trending up, freeze spend pending diagnosis. The diagnosis is usually one of four things: ICP drift (you’re chasing customers outside your ideal profile), competitive pressure raising bids in paid channels, sales productivity problems where unramped reps are eating your acquisition spend, or content saturation where your channels have stopped scaling efficiently.
LTV:CAC ratio sits in the dashboard but not in the driver’s seat. It’s a stability indicator, not a real-time operating signal. A 4:1 ratio with 30-month payback is not actually a good business. A 2.5:1 ratio with 14-month payback is.
Three rules I use that keep budget allocation sane:
Rule one. Pull spend back when blended CAC payback exceeds 24 months at any ARR stage above $5 million, or when GRR drops below 85%. Both are leading indicators that the next dollar of marketing is structurally less productive than the last.
Rule two. Scale spend up when expansion CAC ratio sits below $1.00 and NRR is above 110%. This is the configuration where every marketing dollar is compounding, because retained customers are paying back acquisition twice.
Rule three. Build the budget bottoms-up from payback math, not top-down from a percent-of-revenue target. The industry average is 47% of revenue on sales and marketing for VC-backed SaaS, 33% for PE-backed, but those averages mask 3x variance in efficiency between top and bottom quartiles. *22 The percent-of-revenue framing tells you nothing about whether the next dollar is productive.
The Right Tech Stack Makes This Possible
You can’t run this framework if your data is a mess. At High Rock, we typically set our SaaS clients up on Xero for the general ledger, Brex or Ramp for card and bill pay, Gusto or Rippling for payroll, and Maxio or Tabs for revenue recognition under ASC 606. With that stack in place and a fractional controller keeping the books squeaky clean, we can pull a real CAC payback number on the third business day of every month. That’s the difference between making marketing decisions on data and making them on vibes.
If you’re still running on spreadsheets and trying to back into CAC at the end of every quarter, you’re going to be late on every important budget call. The companies that won the last cycle had their finance function set up to deliver unit economics on a silver platter. The ones that lost were still building the dashboard while the runway was burning.
The Bottom Line
CAC and LTV are not just metrics. They’re a forcing function. They tell you whether your business model works, whether the next dollar of marketing is productive, and whether you can survive a tight capital market without raising again at a brutal valuation.
The 2026 SaaS climate has zero patience for founders who can’t articulate their unit economics. The companies that get funded, get acquired, and stay solvent are the ones whose CAC payback is shortening while their peers’ lengthen, whose NRR is above 110% while the median compresses to 101%, and whose marketing budgets are scaled by unit economics math, not by fundraising narrative.
The single most important decision a SaaS founder makes in 2026 is whether the next marketing dollar has to justify itself in months of payback or in the hope of the next round. The benchmarks I’ve laid out above are the floor, not the ceiling. But they’re the floor that determines who keeps playing.
If your CAC payback is over 24 months and your NRR is under 100%, you’re not running a SaaS business anymore. You’re running a fundraising business. And that game is over.
Not Sure Where Your Numbers Stand? Let’s Talk.
If you’re a SaaS founder and you’re not 100% sure your CAC and LTV calculations would survive an investor diligence call, I’m happy to spend 30 minutes walking through your actual numbers. No pitch, no pressure. Just a sanity check from someone who does this every day. We’re a Slack message away when you need a partner along the way.
Book a free 30-minute call: https://meetings-na2.hubspot.com/shawn-elliott/30-minute-meeting
Or drop into Hawaiian Shirt Friday Ask an Accountant Hour every Friday at 10 AM PT on Zoom: Join Here
Sources
*1 Bessemer Venture Partners, “The Cloud 100 Benchmarks Report 2025.” https://www.bvp.com/atlas/the-cloud-100-benchmarks-report
*2 Carta, “State of Private Markets: 2025 in Review.” https://carta.com/data/state-of-private-markets-q4-2025/
*3 Bessemer Venture Partners, “Scaling to $100 Million.” https://www.bvp.com/atlas/scaling-to-100-million
*4 Benchmarkit, “2025 SaaS Performance Metrics Benchmarks” (FY 2024 data). https://www.benchmarkit.ai/2025benchmarks
*5 First Page Sage, “Average CAC for SaaS Businesses, by Industry & Customer Type,” 2025. https://firstpagesage.com/marketing/average-cac-for-saas-businesses-by-industry-and-customer-type-fc/
*6 Benchmarkit, “2025 SaaS Performance Metrics Benchmarks” (NRR and GRR distribution). https://www.benchmarkit.ai/2025benchmarks
*7 SaaS Capital, “What is a Good Retention Rate for a Private SaaS Company?” 2025; “2025 Benchmarking Metrics for Bootstrapped SaaS Companies.” https://www.saas-capital.com/blog-posts/what-is-a-good-retention-rate-for-a-private-saas-company/
*8 Snowflake Inc., Form 8-K, Q4 FY26 Earnings Release (filed February 25, 2026); Q1, Q2, Q3 FY26 8-K filings, all filed with the U.S. Securities and Exchange Commission. https://www.sec.gov/Archives/edgar/data/0001640147/000162828026011631/fy2026q4earnings.htm
*9 Datadog, Inc., Q4 2025 Earnings Call Transcript (February 10, 2026); Q2 and Q3 2025 supplemental materials disclosing trailing-twelve-month NRR of approximately 120%. https://investors.datadoghq.com/financials
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